Dirt Late Model Car Side View
Dirt Late Model Car Side View
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2024 DIRTcar Late Model Rules: The Official Guide to World Racing Group Regulations

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I. Primary Series and World Racing Group Contacts

For any inquiries regarding the DIRTcar Late Model Series or World Racing Group events, please refer to the contact information below. Whether you are a driver, team owner, or simply have questions about the series, these contacts are here to assist you.

Series Contacts Name Position Phone Number E-Mail Address
Steve Francis Director, Series & Sanctioning (270) 599-4959 sfrancis@dirtcar.com
Mitchell Hedstrom Race Director (803) 517-7193 mhedstrom@dirtcar.com
Steve Francis Technical Official (270) 599-4959 sfrancis@dirtcar.com
Jeff Olson Timing & Scoring (507) 251-3852 jolson@dirtcar.com
Ruben Mireles Announcer (915) 549-9519 rmireles@dirtcar.com
Spence Smithback PR Coordinator (336) 688-2037 ssmithback@dirtcar.com
Corrie Goss Series Marketing Coordinator (724) 464-3649 cgoss@dirtcar.com
Dirt Late Model Car Side View
World Racing Group Contacts Name Position Phone Number E-Mail Address
Corrie Goss Sr. Manager Business Development & Partner Services (724) 464-3649 cgoss@dirtcar.com
Tracey McDaniel Director, Human Resources/Memberships (704) 795-7223 tmcdaniel@dirtcar.com
Jim Chiappelli General Manager, DIRTVision (704) 707-0275 jchiappelli@dirtcar.com

II. Preface: Understanding the Dirt Car Racing Rulebook

World Racing Group events are designed to showcase competitive racing in a structured and fair environment, governed by the rules outlined in this document. These regulations serve as a comprehensive guide for all events, ensuring consistency and clarity for participants. It is important to note that the rulebook is subject to amendments and updates. Participants will be notified of any special rules or adjustments prior to each event. By choosing to participate in these racing events, all drivers, teams, and officials agree to fully comply with these rules and regulations.

This rulebook is intended to provide guidelines for the conduct and officiating of events and should not be interpreted as a warranty of safety. Safety in motorsports is paramount, and while these rules aim to promote safe practices, they cannot eliminate all risks inherent in racing. Compliance with these rules does not guarantee safety for participants, spectators, or officials.

Supervisory Official Discretion

The Supervisory Official holds the authority to make reasonable and appropriate amendments to any specifications or procedures within this rulebook. They can also impose further restrictions if deemed necessary, provided these changes do not compromise the minimum acceptable standards. Revisions to these rules, or any deviations or restrictions, should not be seen as a warranty of safety. The interpretation and application of these rules are at the sole discretion of the racing officials, and their decisions are final.

Equipment and Modifications

Any changes to equipment, modifications to existing parts, or performance-enhancing alterations to previously approved components must receive written approval before being introduced into competition. This process ensures fairness and maintains the integrity of the racing series.

Supervisory Officials reserve the right to immediately assess the legality and use of any equipment that has not received prior written approval. Ultimately, it is each participant’s responsibility to ensure their conduct and equipment adhere to all applicable rules, including any amendments. It’s crucial to understand that these rules are in no way a guarantee against injury or death to participants, spectators, officials, or others involved in the event.

PENALTIES FOR NON-COMPLIANCE: Any car, team, and/or driver failing to meet these specifications and/or equipment requirements will face penalties determined by the World of Outlaws CASE Construction Late Model Series officials.

III. Chapter 1 – World Racing Group General Rules

For a comprehensive overview of the overarching regulations that govern all World Racing Group events, please refer to the World Racing Group General Rules. This section outlines fundamental guidelines applicable across all series and event types under the World Racing Group umbrella.

IV. Chapter 2 – Procedure Rules

This chapter details the procedural rules that govern racing events, from pre-race preparations to post-race protocols.

Section 1 – Racing Event Procedures

This section outlines the step-by-step procedures for racing events, ensuring a structured and organized competition.

A. Pre-Race Inspections

Prior to any on-track activity, all cars entered in a Series event and intending to compete must successfully pass a pre-race inspection. This crucial step ensures vehicle compliance with safety and technical regulations. Inspections may be conducted in designated areas or, space permitting, directly at the team’s transporter. Refusal to present a vehicle for inspection or obstructing officials will lead to disqualification from the event, along with potential penalties and fines.

B. Drivers Meeting(s)

Attendance at the drivers’ meeting is mandatory for all participants. Drivers failing to attend may face penalties including fines, loss of driver and/or owner points, or even suspension. The drivers’ meeting serves as a vital communication platform where essential information is conveyed, including the number of cars starting each race, the lap count for each event, and any program adjustments due to car count, track conditions, or unforeseen circumstances. Any modifications to the event schedule will be announced at this meeting.

C. Inspection Procedures and Legality

Racing officials retain the authority to inspect any car at any time during a racing event. This includes the discretion to impound parts, components, engines, or entire cars for competitive analysis or research data collection. It’s important to note that World Racing Group is not responsible for any costs associated with inspections. Officials can conduct inspections at their discretion on any car entered for competition at any point during a racing event.

D. Weighing and Scales

Following each race, all cars must proceed to the designated scales for weighing, according to announcements, radio instructions, or posted guidelines. Adherence to the weight rule and track layout is mandatory. Any deviation from the direct route to the scales, including detours or unnecessary maneuvering, may result in disqualification or penalties. The race winner is required to weigh in before participating in any Winner’s Circle interviews or presentations. Detours on the way to the scale can lead to a loss of finishing position or time. If a car stops en route to the scales and is touched by anyone other than a Race Official, the driver may be disqualified. Any car failing to meet the minimum weight requirement after a race will forfeit its time and/or finishing position for that event. The scales designated for the event, whether provided by the series or the track, are considered the official scales. Teams may verify their car weight using the official scales. The number of cars to be scaled each night will be announced at the driver’s meeting, on pit boards, or via one-way radio. Cars must present themselves directly onto the scales. The displayed figure is the official weight. Officials will allow a car to re-scale up to two times, with the final attempt determining the official weight.

Penalties for Weight Infractions:

  • Qualifying: Forfeiture of earned qualifying position and starting last in the heat race.
  • Heat Race: Penalty applied for the heat race, but eligibility for subsequent qualifying races remains.
  • Preliminary Mains, LCS, and Feature: The car and driver will be scored in the last finishing position for that race.

E. Restrictions

Once a racecar has started or any race has commenced, all work on the car must be performed within the designated work area, unless otherwise instructed. Participants who violate this rule may face disqualification, fines, suspension, or other penalties deemed appropriate by Officials or World Racing Group Supervisory Officials.

On the initial push or during a yellow/red flag, a car requiring more than one ‘push-off’ (except for safety reasons) will incur a penalty of 2 running positions. A ‘push-off’ is considered complete when the pushed vehicle starts and moves away from the push vehicle. Tampering with the track racing surface by drivers or team members is strictly prohibited and may result in disqualification, fines, suspension, or other penalties. Entering the racing surface without explicit approval from an official is also prohibited and carries similar penalties.

Drivers should remain in their cars unless extenuating emergency circumstances arise. In such cases, drivers should turn off the electrical power, remain inside, and await track/safety officials without removing any safety equipment. Approaching any part of the racing surface or another moving vehicle is forbidden for drivers and crew members. If a car/driver switch occurs for any reason, the new car/driver combination must start at the rear of the next race segment for which the car/driver has qualified.

F. Entry and Pill Draw

For every event, all drivers and/or teams must draw for a position in the qualifying order at the designated location. Participants are responsible for their own pill draw. Only one car entry per driver is permitted per event. All pill draws must be completed before the driver’s meeting. Teams failing to draw will be placed at the end of the qualifying order or, if there is no qualifying, at the rear of their designated qualifying race. All participants must be DIRTcar Members in good standing to participate in any event draw.

G. Hot Laps

Hot laps will proceed in qualifying order for all entered cars. Drivers missing their assigned group forfeit their hot lap opportunity. The scoring transponder must be mounted on the racecar before hot laps. If track packing is necessary, cars not participating will receive only one qualifying lap, and the best possible qualifying position will be 50% + 1 of the total entered cars for the event.

H. Qualifying

Qualifying typically consists of two timed laps, but this may be adjusted at the discretion of series Officials. Multi-car qualifying may be implemented under suitable conditions. Qualifying may be divided into groups based on car count. Cars must qualify within their assigned group. Qualifying order follows the pill draw. A two-car/two-group grace period is allowed for teams to be ready for their qualifying run. Missing the grace period results in qualifying at the end of the scheduled lineup with only one qualifying lap. The best possible position for late cars is 50% + 1 of the total qualifiers in their group. Once a car is pushed or rolls for time trials, it’s considered a qualifying attempt, even if it doesn’t start. Leaving the track or returning to the qualifying line after an attempt results in a single qualifying lap as a late car. Late cars must be in line before the last scheduled car starts qualifying. Qualifying closes after all cars in line have attempted. Ties in qualifying times are broken by the fastest other lap time. If still tied, the qualifying pill draw determines the tiebreaker. In one-lap qualifying, the pill draw is the tiebreaker. World Racing Group Supervisory Officials may revise qualifying procedures due to weather or unforeseen circumstances. If a race is postponed after qualifying (except for multi-day events), drivers can start in their earned qualifying position even if using a different car than initially qualified. Taking an extra lap or missing the track exit during qualifying results in the loss of the fastest qualifying lap. Causing a caution during a qualifying attempt limits the driver to one qualifying lap.

I. Heat Races

Heat race lineups are determined by qualifying results. The number of laps and transferring cars for heat races are set by World Racing Group officials based on track size, competitor count, and other factors, and will be announced at the driver’s meeting. A redraw for starting positions may occur among top finishers from each heat race. The number of redraw participants depends on the number of heat races and will be announced at the driver’s meeting. Drivers transferring to the feature race from heat races but not participating in the redraw will line up based on their heat race finish. Drivers not transferring from heat races will compete in an LCS or preliminary main.

J. Last Chance Showdown(s) (LCS)

LCS lineups are based on heat race finishing orders. The number of laps and transfer positions from LCS events are determined by World Racing Group officials, considering track size and competitor count, and will be announced at the driver’s meeting.

K. Backup Cars

A backup car can be introduced between qualifying and the feature race start if the original car is not operating correctly or is extensively damaged. This decision is at the sole discretion of Series Officials. A car change results in starting at the rear of the next race segment for which the driver qualified. Drivers changing cars after hot laps retain their drawn qualifying position and subsequent race positions. Backup cars must pass pre-race technical inspection before competing. Backup cars can come from any source and don’t need to be part of the team’s original equipment. An additional entry/inspection fee may apply for backup cars. Once a car is withdrawn from an event, it cannot re-enter during that event. Once a race car is presented for the feature race, no backup car can be introduced for the remainder of that feature race.

L. Dash Exemptions

If a car or driver crashes or is injured during the Dash and cannot start the Feature, they will be awarded last place in the Feature. No alternates will be added to the field.

M. Starts

Races begin immediately once the racing surface is clear and cars are correctly aligned in starting positions. Drivers, teams, or cars deliberately delaying the start may be placed at the rear of the lineup and could face disqualification, suspension, or fines. Late cars not ready to race within the allotted time (announced at the driver’s meeting) will be penalized to the rear of the field. Sprint Car push-offs will incur a two-position penalty. Cars pushed or joining the field after assembly starts must start at the rear. Once the one-to-go signal is given, no cars can enter the racing surface unless directed by an official. All starts and restarts occur at a consistent speed, determined by World Racing Group Officials, within a designated area announced at the driver’s meeting. Cars out of line or passing before this point will cause a caution and be penalized two positions on the restart. Cars in the last row committing this offense will be penalized two finishing positions. A second offense leads to disqualification. Front row cars must choose and maintain their racing line from turn three until the start/restart. Failure results in a two-position penalty and potential parking for the race. If the front row cars improperly start the race, they may be moved to the second row. Failure to comply may result in parking. Alternate starters are not allowed after the original start. One lap must be completed before a restart lineup is used. The pole car sets the pace, and the front row starts together in the designated area. Passing before the front row accelerates is not allowed. For single-car incidents before lap one, the race restarts with the original lineup minus the involved car. Multi-car incidents before lap one result in a restart with the original lineup minus cars that exited the track.

N. Restarts

Restarts will position lead lap cars at the front, with lapped cars pulling to the inside behind the last lead lap car in running order. Cars unable to restart properly after one attempt will be penalized two positions. For restart infractions, World of Outlaws Officials may continue the race and penalize the offending car(s) under yellow or after the race, with a two-position penalty plus any positions gained. The restart area will be designated and announced at the Driver’s Meeting. Consistent restart speed is at the discretion of Series Officials. Cars stopping in the pit/work area during caution will restart at the rear. Cars involved in a red flag situation restart at the rear, including those pitting during red flags. Cars stopped due to a blocked track during a red flag, at the discretion of officials, may not be considered involved in the red. Cars stopped for consultation during caution retain position if deemed ‘clear’ by officials and return to competition without adjustments. Cars not in nose-to-tail alignment or creating excessive gaps may be penalized, with potential disqualification for multiple violations.

Double-File Restarts: Under yellow, the field initially goes single-file. Once set, the leader chooses inside or outside lane, and the field realigns double-file. Cars behind the leader go to the leader’s lane, and those behind 2nd place go to the 2nd place car’s lane. The grid stays double-file and nose-to-tail until the start in the designated area. The leader sets pace and controls the restart. Passing is allowed once the race starts for the entire field. Officials can alter this rule with notice due to circumstances.

Single-File Restarts: Single-file restarts are used for the final ten laps of features over 50 laps and the final five laps of features under 50 laps, and may be used at other times. Cars line up single file, following the car ahead. Cars not in nose-to-tail alignment or creating excessive gaps will be penalized two positions. Cars in the last two restart positions committing an offense will be penalized two finishing positions. Multiple violations can lead to disqualification.

O. Racing

Cars leaving the designated racing surface to improve position will be black flagged and penalized. The maximum number of laps is announced at the driver’s meeting but can change. Cars spinning, involved in incidents, or having problems without causing a caution will blend back into the field where possible. Inadvertent cautions will result in Series Officials determining car placement based on where they rejoined the field. Officials may penalize cars involved in two or more unaided spins. All races must end with a “green-white-checker” finish: if a caution occurs before the leader gets the checkered flag, the race restarts for two laps. A one-lap “white-checkered” finish is allowable at officials’ discretion. If a race is red-flagged for weather and cars pit, work and tire changes are allowed. In open red situations after a closed red, cars involved realign at the rear by scored position on the last lap (lead lap, 1 lap down, etc.). Spins or stoppages requiring restart during yellow result in the involved car(s) realigning at the rear. Competitors deliberately causing a caution may be penalized at the discretion of World Racing Group Officials. Cars going to the work area and re-entering will be positioned at the rear by last scored lap, behind same-lap cars. If a restart green flag is followed by a yellow/red before a lap is scored, work area cars can re-enter behind same-lap cars that took the restart green. Cars remaining in the work area can re-enter during any stoppage, behind same-lap re-entering cars. Officials can end an event at any lap count if conditions prevent continuation. The race is complete unless announced otherwise. If unforeseen circumstances prevent completing the advertised distance, the race is officially completed as of the last scored lap before the halt, with finishing positions determined as if the race restarted. A pace car may be used before starts and restarts; passing it is not allowed unless instructed. Hand signals and colored gloves are allowed for driver communication; flashlights, electricity, two-way radios, or electronic communication are prohibited. Drivers not qualified for the Feature but entering due to car/driver separation earn show-up points only. If a push truck, pace vehicle, or another race car hits a race car inadvertently or purposely during push-off, yellow flag, or non-racing activity (witnessed by an official), repairs are allowed within six minutes, after which the car resumes its position. If repairs are not completed, the car finishes last. No alternate starters in this situation. If the damaged car can’t re-enter, it’s scored last on the completed lap. Once the staging horn blows, no work is allowed in the staging lane or designated area. Adding fuel is prohibited during yellow or closed red flag conditions, whether on track or in the work area.

P. Work Area

During yellow flags with a correct single-file lineup, a two-lap period is allowed for flat tires and mud-packed wheels only. Cars rejoin at the tail of their lap after work completion, as directed by officials.

Q. Flag Rules and Officials Signals

  • a. Green Flag

    • i. Signals the start of any race or qualifying run.

  • b. Yellow Flag

    • i. Indicates a caution period when displayed or when yellow caution lights are illuminated.
    • ii. No passing is permitted during yellow flags/caution lights unless instructed by officials.

  • c. Red Flag

    • i. All red flags are closed red flags unless officials declare an open red. Open reds may designate a work area on track. Cars move to the work area before work begins.
    • ii. During red flags, all cars on track and in pits must stop completely in a controlled manner, avoiding the incident area. Cars must not move unless instructed. Unauthorized movement results in penalties or parking.
    • iii. Drivers must remain in cars during red flags unless involved in the incident or instructed otherwise.
    • iv. During red flags, the race director may allow cars to go to the work area via radio instruction. Cars going to the work area forfeit their running position and restart at the rear or are scored behind non-work area cars if the race is canceled due to weather.
    • v. Work and tire changes are allowed if a race is red-flagged for weather.
    • vi. CLOSED RED: Track closed. Crew members not allowed on track or to cars.
    • vii. OPEN RED: Race Director determines when the track opens. Repairs/adjustments (except tires) allowed. A horn signals a 2-minute work period. A double horn at one minute remaining, and a final horn ends work. Crews must clear cars by the final horn or incur a 2-position penalty. Last row cars violating this penalized 2 finishing positions. Cars still being worked on when the field assembles are disqualified.
    • viii. FUEL RED: A horn signals a 2-minute work period when crews reach cars. Same 2-minute procedure as open red. Repairs/adjustments (except tires) allowed if completed within 2 minutes.

  • d. Black Flag

    • i. Displayed to a driver who must immediately bring their car to the designated pit work area for consultation. The car is unscored from the black flag point and can only return to track during caution/red after inspection.

  • e. White Flag

    • i. Signals the leader or qualifying car has started the last lap.

  • f. Checkered Flag

    • i. Signals event completion. Cars must pass under it to be scored on the final lap.
    • ii. Race is complete once the leader crosses under the checkered flag.

  • g. Officials Signals

    • i. Drivers must obey all signals, communications, blackboards, or official instructions for lineups and event completion.

R. General Racing Equipment, Driver Radios, and Scoring Transponders

All competitors in all series must have a working, approved one-way radio system for lineups and race control. Cars must have hardware for scoring transponder attachment. Scoring transponders must be securely mounted in the specified location. Competitors are responsible for proper installation and function. Non-functioning transponders require a pit stop for installation, and penalties may apply.

Section 2 – Scoring Procedures

A. All races are scored at the designated start/finish line.
B. A lap is only scored on the original start or any restart if all cars complete the lap through the start/finish line, except for cars involved in an incident.
C. After the first green flag lap following a start or restart, cautions will result in cars holding their green flag scored position, with others lining up by their last completed green flag lap. This partial lap counts towards the total event laps. Racing back to the start/finish line is not allowed (split scoring). A completed lap is leader plus one car.

Section 3 – Payoff Procedure

A. All purses, appearance money, awards, and funds outlined in the promoter’s contract are paid to the car owner or designated representative.

Section 4 – Provisional and Alternate Starting Positions

A. Provisional starting positions are discretionary and may not be awarded if a car is deemed uncompetitive or late for the feature event.
B. Refused or unused provisionals are forfeited for that night and awarded to the next eligible driver without exception.
C. Teams seeking a provisional must have attempted to compete in at least one preliminary event leading to the Feature.
D. Provisional starters begin at the rear of the Feature.
E. Provisional starters earn full WoO points if provisionals are allowed in the Feature.
F. Unlimited emergency provisionals are available for platinum teams throughout the season.
G. Multi-car teams cannot rotate drivers to improve provisional position.
H. Teams using a provisional forfeit the minimum start money for the Feature but receive advertised payouts for positions above start money.
I. Teams seeking a provisional must have attempted to compete in at least one preliminary event leading to the Feature.
J. Provisionals start at the rear of the Feature.
K. Provisional order for Speedweeks (Sunshine & DCN) to fill six spots:

  • a. One (1) 2024 Owner Points
  • b. One (1) 2024 Driver Points
  • c. Four (4) Emergencies based off 2024 points
  • d. Night 1 of Sunshine: Qualifying times of 2025 new platinum teams
  • e. Night 2+: Highest in points standings of 2025 new platinum teams
    • i. Points tiebreaker is the best qualifying time of that night

L. Provisional order after Speedweeks (Sunshine & DCN) to fill four spots:

  • a. One (1) 2025 Owner Points
  • b. One (1) 2025 Driver Points
  • c. Two (2) Emergencies
  • d. Top 25 in 2025 points
  • e. Overall fastest qualifier

M. Tracks with weekly programs may implement an identical provisional program for up to 2 local drivers.
N. Qualified cars/drivers unable to take the initial green flag receive last place feature points and purse, pending Series Officials’ approval. Multiple cars unable to start are scored at the back based on starting position. Alternates are not taken to the Feature Event.
O. If a Platinum Team splits, and both Owner and Driver retain Platinum status, both are eligible for any unused Provisionals from the original team.

Section 5 – Racing Program and Special Show Events

A. Special event shows may deviate from Series racing formats. Teams will be informed of program/procedural changes. All racing programs are subject to change, with changes communicated to competitors before the race.
B. Mandatory appearances, interviews, or autograph sessions may be scheduled. Drivers will be notified of attendance and location. Failure to attend may result in written penalties, point deductions, starting position losses, or fines.

Section 6 – Points Breakdown

Place Points Place Points Place Points Place Points
1st 150 8th 134 15th 120 22nd 106
2nd 146 9th 132 16th 118 23rd 104
3rd 144 10th 130 17th 116 24th 104
4th 142 11th 128 18th 114 25th 104
5th 140 12th 126 19th 112 26th 104
6th 138 13th 124 20th 110
7th 136 14th 122 21st 108

A. 100 show-up points are awarded to members in good standing who attempt to qualify but fail to make the feature event.
B. If a race is canceled and rescheduled, members unable to return due to extenuating circumstances may receive show-up points if present and prepared to race on the original date.
C. Special events award points as agreed with members, using show-up points only.
D. Season ties are broken by the highest finish in the most recent event, then by wins, top 5s, top 10s, and finally the last completed event.
E. Final Championship Point Standings ties are broken by most feature wins, then second-place finishes, third-place finishes, etc., and if still tied, by qualifying results in the same manner.
F. Injured drivers or those unable to participate with valid excuses (determined by the WoO Series Director) may be eligible for 100 hardship points, subject to a vote by platinum teams.

Section 7 – Practice and Test Sessions

A. No open or closed test or practice sessions are allowed seven (7) days before a World of Outlaws Late Model Series event without prior authorization from World Racing Group officials.

V. Chapter 3 – Technical Rules

This chapter specifies the technical rules and regulations governing the construction and components of dirt late model race cars.

Section 1 – Engines

A. Engine Type: Only conventional V-8 engines with in-block camshafts are permitted. Cubic inch displacement is optional.
B. Engine Design: Engines must be based on manufactured, factory designs.
C. Engine Block: Aluminum or steel blocks are allowed.
D. Engine Aspiration: Naturally aspirated engines only, with a single conventional four-barrel carburetor.
E. Starting Mechanism: Engines must have an operational self-starting mechanism.
F. Ignition System: Only one distributor or magneto is allowed. Individual cylinder coil systems are prohibited.
G. Engine Setback: Maximum 25-1/2 inches from the center of the left ball joint to the front of the motor plate/engine bell housing flange.
H. Valves and Spark Plugs: Maximum two valves and one spark plug per cylinder.
I. Harmonic Balancer: SFI Spec 18.1 certified harmonic balancer is mandatory.
J. Overhead Cams: Overhead cam engines are prohibited.
K. New Engine Components: New engine components or configurations must be communicated to and approved by the Series Director before competition.
L. Carburetor Roll-Over Plate: An approved carburetor roll-over plate is recommended to prevent fuel spillage in case of a roll-over.

  • a. Approved roll over plates:
    • i. Willy’s Carb & Dyno shop LLC. Part # WCD4000SB
    • ii. Willy’s Carb & Dyno shop LLC. Part # WCD400

M. Crate Engine: Chevy Performance CT525 Circle Track Crate Engine is permitted and must be a wet sump engine.

Section 2 – Transmission, Driveline, and Driveline Components

A. Transmission

  • a. Clutch: A functional clutch is mandatory. Direct drive systems are prohibited.
  • b. Mounting: The transmission must be bolted to a bellhousing, which in turn must be bolted to the engine.
  • c. Gears: Transmissions must have forward and reverse gears, shiftable while the engine is running.
  • d. Speed: Only two-speed transmissions with working reverse, low, and high gears are allowed. High gear must be 1:1.
  • e. Overdrive/Underdrive: Overdrive or underdrive multiple speed transmissions are prohibited.

B. Driveshaft

  • a. Diameter and Color: Driveshaft must be minimum 2 inches in diameter and painted white.
  • b. Quantity: Only one driveshaft connecting the transmission to the rear end center section is allowed.
  • c. Hoop/Sling: A minimum of one driveshaft hoop/sling must be securely fastened to the frame.

C. Rear End

  • a. Type: Any type of rear-end differential/center section is allowed.
  • b. Independent Suspension: Independent rear suspensions are prohibited.
  • c. Hubs: Full-floating hubs made of aluminum or magnesium with “wide 5” wheel bolt pattern are mandatory.
  • d. Axle Housing: Axle housing must be of the closed-tube design using full-floating magnetic steel axle shafts.
  • e. Center Section Material: Center section must be made of aluminum or magnesium.
  • f. Axle Tubes: Axle tubes must be one-piece, made of aluminum or magnetic mild steel. Exotic or heavy materials are prohibited. Maximum outside diameter of axle tubes is 3 inches. Internal inserts or external sleeves are prohibited. Adding ballast weight to the axle housing is prohibited.

Section 3 – Fuel, Fuel Cells, and Fuel System

A. Fuel Cell Specifications: Fuel cells must meet or exceed FIA/FT3 or SFI 28.3 specifications.
B. Fuel Cell Capacity: Maximum fuel cell capacity is 35 gallons before foam.
C. Fuel Cell Container: Fuel cell must be enclosed in a container with minimum 20-gauge magnetic steel or 0.060-inch aluminum.
D. Fuel Cell Cap: Fuel cell cap must be threaded or ATL Part # TF751 quarter (1/4) Turn Bullet Cap, or Schultz Racing Fuel Cell part #SFP-300 quarter (1/4) turn cap.
E. Visibility: The entire container must be visible for inspection.
F. Fuel Cell Mounting: Fuel cell must be mounted behind the rear axle, between the rear tires, and minimum 4 inches ahead of the rear bumper. The bottom of the fuel cell must be no lower than the bottom of the rear end/quick-change housing.
G. Fuel Cell Straps: Fuel cells not in a welded steel tubing “rack” must have two equally spaced straps, 2 inches wide and 1/8 inch thick, surrounding the fuel cell and bolted to the frame. Longitudinal (front to rear) strap mounting is recommended.
H. Fittings: Fuel valve plate, pickup, and return fittings must be on top of the fuel cell.
I. Fuel Type: Only racing gasoline or alcohol is permitted. Nitrous oxide, nitromethane, and propylene oxide are prohibited.
J. Fuel Inspection: Competitors must be prepared to drain fuel for inspection.
K. Fuel Pumps: Mechanical fuel pumps only, engine-mounted, camshaft or belt driven. Electric pumps, pressure systems, and additional reservoirs are prohibited.

Section 4 – Electrical Systems, Batteries, and Electrical Accessories

A. Battery Mounting: Batteries must be securely mounted with positive fasteners and brackets, braced in two horizontal and one vertical position.
B. Battery Terminals: Battery terminals must be insulated, and the battery enclosed in non-conductive material to prevent contact with car parts if dislodged.
C. Battery Disconnect Switch: A mandatory battery disconnect switch must be installed on the rear deck, behind the driver’s seat, easily accessible from outside the car, clearly labeled with off/on directions, directly in-line with the negative battery cable, and capable of completely disconnecting the negative terminal. Negative/ground wiring connections must not be made between the battery negative terminal and the disconnect switch input side.
D. Battery Location: Batteries are prohibited in the driver’s compartment/cockpit.

Section 5 – Exhaust, Muffler, and Sound Reduction Devices

A. Exhaust Flow: Exhaust flow must be parallel to the ground. Systems directing flow downwards are prohibited.
B. Exhaust Collectors: All exhaust systems/headers must end with a collector.
C. Decibel Rules: Some tracks have local decibel rules preempting muffler rules, potentially as low as 95 decibels at 100 feet, enforced by local government agencies.
D. Decibel Rule Compliance: If a decibel rule is in place, it must be met, regardless of muffler application.

Section 6 – Ignition Boxes, Traction Control, Radio, and Transmission Devices

A. Traction Control: Electronic or computerized wheel spin, ignition retardation, acceleration limiting, or traction control devices are prohibited.
B. Adjustable Controls: Adjustable ping control devices, dial-a-chip controls, timing controls, and automated throttle controls are prohibited.
C. Restrictor Plates: Adjustable restrictor plates are prohibited.
D. Remote Control: Remote control components are prohibited.
E. Radios: Radios or devices for voice or data transmission are prohibited.
F. Data Acquisition: Data acquisition systems are prohibited.
G. GPS Tracking: GPS or electronic tracking/locating devices are prohibited.

Section 7 – Chassis and Frames

A. Chassis

  • a. Wheelbase: Minimum wheelbase 103 inches, maximum 105 inches.
  • b. Square Tubing Frames: Square tubing frames must be minimum 2×2 inch magnetic steel with 0.083-inch thickness.
  • c. Round Tubing Frames: Round tubing frames must be minimum 1-3/4 inch OD magnetic steel, 4130 chrome moly, Docol, or DOM with 0.083-inch thickness.
  • d. Rear Bumpers: Stubbed rear bumpers can extend maximum 8 inches beyond the frame, or must be formed and directed 8 inches forward.
  • e. Battery Supports: Battery supports/mounts must be secured and braced in two horizontal and one vertical position.
  • f. Serial Number: Manufacturer’s unique serial number should be displayed on every chassis.
  • g. Aluminum Frames: Aluminum frames, door bars, or bumpers are prohibited.
  • h. Titanium: Titanium fasteners, chassis, or suspension components are prohibited.
  • i. Left Side Under-Slung Bar: All cars must have a left side under-slung bar between the left rear birdcage and axle housing bell edge, passing under the left axle tube.
  • j. Slip Joints: Slip joints are prohibited; all joints must be welded.

B. Roll Cage

  • a. Tubing Specs: Roll cage must be minimum 1-1/2 inch OD, 0.065-inch thick seamless magnetic steel tubing.
  • b. Door Bars: Side/door roll bars must extend into door panels.
  • c. Left Side Door Bars: Minimum three 1-1/2 inch OD, 0.065-inch thick bars required on the left side door area.
  • d. Height: Roll cage must be above driver’s helmet, minimum 38 inches between floor pan and roll cage bottom.
  • e. Round Tubing: Roll cage must be constructed of round tubing only.
  • f. Slip Joints: Slip joints are prohibited; all joints must be welded.

C. Driver Side Intrusion Plate

  • a. Material: Minimum 1/8-inch thick magnetic steel intrusion plate mandatory on driver’s side door bars.
  • b. Approved Installations:
    • i. Welded plates: Individual plates between door bars, welded around each opening, minimum area 16×26 inches.
    • ii. Bolted plates to tabs: Minimum 16×26 inch plate bolted to 1/8 inch magnetic steel tabs welded to chassis, minimum 8 x 3/8 inch Allen button head bolts. Minimum three tabs/bolts across top and bottom, and one tab/bolt in middle front and rear.
    • iii. Bolted plates to clamps: Minimum 16×26 inch plate bolted to minimum six approved door bar clamps using included 12 x 1/2 inch Allen button head bolts per manufacturer. Minimum three clamps/bolts across top and bottom.
    • iv. Approved door bar clamps:
        1. Bicknell Racing Products – Part Number: BRP 954
        1. Wehrs Machine & Racing Products – Part Number: WM397
        1. Allstar Performance – Part Number: ALL4198

D. Weight and Ballast

  • a. Minimum Weight: Minimum car and driver weight is 2,350 lbs. with any engine block, as weighed on track scales.
  • b. Weight Attachment: Attached weights must be securely fastened to the frame, painted white, and display the car number. Secured by two 1/2 inch Grade 5 or higher bolts on two weight clamps per piece.
  • c. Weight Location: Added weight must be securely attached to the frame below the body decking. Frame defined as the steel welded structure only.
  • d. Moving Parts: Moving or non-fixed components cannot be used for weight attachments.
  • e. Bumper/Outside Weights: Weight attached to the rear bumper or outside the frame is prohibited.
  • f. Weight Loss: Losing weight/ballast during an event may result in penalties.
  • g. Pellet/Liquid Weight: Pellet or liquid-type weight/ballast is prohibited.
  • h. Driver-Operated Weight Adjustment: Driver-operated weight adjustment or ‘weight jacking’ devices are prohibited.
  • i. Official Scales: Event scales provided by the series or track are official.
  • j. Scale Verification: Scales available for teams to verify car weight.
  • k. Re-weighing: Cars not meeting weight may re-weigh up to two additional times. The final weight recorded is official.

Section 8 – Body

A. General Body

  • a. Radius Edges: Minimum 1/2 inch, maximum 1 inch radius on top of fenders, doors, and quarter panels. Sharp edges prohibited.
  • b. Floorboards and Firewall: Must completely cover driver’s area without openings.
  • c. Fins/Lips: Fins or lips of any type are prohibited along the entire car length.
  • d. Wedge Shape: Wedge shape cars/body styles prohibited.
  • e. Belly Pans: “Belly pans” or any bottom enclosure prohibited. Oil pan skid plate allowed, maximum 1/8 inch thick.
  • f. Underbody Air Deflectors: Wings, tunnels, or air deflection devices under body/chassis prohibited.
  • g. Stone Deflectors: Maximum one stone deflector allowed for rear-mounted oil pumps, filters, and main oil tank. Steel, aluminum, or heavy gauge wire, extending from mid plate to four-bar plate, mounted near protected unit, not above upper or below lower frame rail.
  • h. Rear Deck Panels: Panels under rear deck from front to rear prohibited.
  • i. Air Cleaner Scoops: Air cleaner scoops must be in front of/around air cleaner, maximum 7 inches high. Flanges, air deflection devices, or fins to direct airflow prohibited.
  • j. Body Line Straightness: Top edge of rear quarter, door, and front fender to fender flare point must be a straight line within 1 inch on both car sides.
  • k. Solid Panels: All body panels must be solid, no holes, slots, or air gaps allowed. NACA ducts or NACA style ducts prohibited. One hole for interior (deck) mounted oil cooler allowed.
  • l. Ground Clearance: Minimum ground clearance (including plastic) is 3 inches.

B. Nosepiece

  • a. Approved Nosepieces: Only approved nosepieces are permitted:
    • i. Dominator (must fit MD3 template)
    • ii. MD3 – Performance Bodies
    • iii. ARP Air Speed Nose
    • iv. Five-Star MD3 type
    • v. Performance Bodies/Five Star MD3 2015
    • vi. Performance Bodies / Five Star 2016 Evolution
    • vii. Performance Bodies / Five Star 2019 Evolution 2
  • b. Installation: Approved nose assemblies must be installed per manufacturer instructions, meeting dimensions, maintaining appearance, and unaltered.
  • c. Material: Nosepieces must be molded type material.
  • d. Filler Panel: Nose filler panel must be flat within 1/2 inch across the entire surface, no dishing or raising. Underneath bracing must maintain flat shape at speed.
  • e. Two-Piece Noses: Two-piece noses must be positively fastened in the center, no spacers to gain width.
  • f. Mounting Flatness: Nosepiece must be mounted flat where filler panel and nosepiece meet, without altering original shape, checked with template against mounting supports.
  • g. Cooling Holes: Cooling holes must be within 10 inches from the nose center point.
  • h. Nose Extension: Nosepiece maximum extension 53 inches from front hub center.
  • i. Fender Flare Height: Front fender flares maximum 4 inches above filler panel or hood.
  • j. Nose Offset: Nosepiece maximum 5 inches off-center at nose center/overlap.
  • k. Lower Nose Supports: Lower nose supports (under front bumper at valance) maximum 8 inches wide.

C. Roof

  • a. Length: Roof length 44-54 inches front to back.
  • b. Width: Roof width 48-52 inches side to side.
  • c. Mounting: Roof must be mounted with positive contact to all four roll cage corners, minimum four bolts near corners, no spacers, parallel to body, near car center.
  • d. Edge Modifications: Maximum 1-1/2 inch downward roll on front roof edge. Maximum 1 inch, 90-degree bend on rear edge. Only for strength improvement, no other modifications.
  • e. Roof Shape: Flat or odd-shaped roofs prohibited. Bellied or hollowed roofs prohibited.
  • f. Sun Shields: Sun/anti-glare shields prohibited.
  • g. Bead Rolls: Maximum two roof edge bead rolls, maximum 1/2 inch height, full roof length.
  • h. Roof Thickness: Maximum roof thickness 1/2 inch at any point.
  • i. Roll Cage Exposure: Roll cage and frame members above interior panels (decking) must remain open, no enclosures allowed.

D. Roof Supports and Window Side Panels

  • a. Side Panel Extension: Roof side panels must extend to the body edge.
  • b. Sail Panel Dimensions: Sail panels 15-17 inches at top, 40-43 inches at bottom.
  • c. Window Covering: Window area may be covered with clear Lexan or transparent material. Both windows must be covered or open.
  • d. Open Sail Panels: Open sail panels must have 2-3 inch border frame at top/sides, and 3 inches at bottom.
  • e. Sail Panel Radius: Maximum inside radius of either sail panel is 3 inches.
  • f. Matching Panels: Left and right window panels must match.
  • g. Bow: Maximum 2 inch outward bow on window side panels from behind.
  • h. Front Roof Supports: Front roof supports must extend forward to hood rear, maximum 4 inches wide, left and right must match.
  • i. Spoiler Support Clearance: Minimum 3 inches between sail panel and spoiler support.

E. Front Fenders, Fender Flares, and Hood

  • a. Hood Levelness: Hood must be level and flat side to side.
  • b. Hood Drop: Hood can drop 2 inches at the back edge and in front of the carburetor from left to right. Fenders must taper to hood in a straight line.
  • c. Fender Top Width: Fender top minimum 10 inches wide.
  • d. Body Line: Hood/fender outside edges must remain inside overall bodyline.
  • e. Fender Height: Front fender height 36-38 inches, ground to fender top behind front tires.
  • f. Fender Flare Material: Front fender flares must be plastic and not alter nose piece shape.
  • g. Flare Extension: Front fender flares must not extend beyond front tires more than 1 inch per side, maximum 91 inches edge-to-edge at valance bottom, wheels straight.
  • h. Flare Rise: Front fender flares maximum 4 inch rise at any point on fenders/hood.
  • i. Collapsible Supports: Front fender flares must have collapsible supports.
  • j. Right Fender Carburetor Clearance: Right front fender minimum 33 inches from outside edge to carburetor center.

F. Doors

  • a. Top Door Width: Door-to-door width maximum 77 inches at door tops.
  • b. Bottom Door Width (Center): Door-to-door width maximum 90 inches at door bottoms in car center (including plastic).
  • c. Bottom Door Width (Widest): Door-to-door width maximum 94 inches at door bottoms at car widest point (including plastic).
  • d. Door Height: Doors maximum 37 inches high from ground to door top.
  • e. Door Bow: Door sides maximum 1 inch inward bow top to bottom (including plastic).

G. Quarter Panels

  • a. Quarter Panel Height: Maximum 54 inches from rear hub center to quarter panel top.
  • b. Top Quarter Panel Width: Quarter panel maximum 76 inches wide at top.
  • c. Rear Deck Taper: Rear deck must taper from quarter panel/door to spoiler, 72-76 inches wide.
  • d. Outside Quarter Panel Width: Maximum quarter panel width 80 inches outside-to-outside (including plastic).
  • e. Quarter Panel Bow: Quarter panels maximum 1 inch inward bow top to bottom (including plastic).
  • f. Quarter Panel Extension: Maximum 49 inches from rear hub center to quarter panel rear trailing edge.
  • g. Tire Clearance: Minimum 2 inch tire clearance between tire and body required.
  • h. Left Rear Wheel Opening: Left rear wheel opening between quarter panel and door 28-33 inches.
  • i. Right Rear Wheel Opening: Right rear wheel opening between quarter panel and door 29-32 inches.
  • j. Rear Skirting: Skirting extending behind rear quarter panel prohibited.
  • k. Left Rear Quarter Panel Drop: Left rear quarter panel must extend 33-36 inches down from deck (including plastic).
  • l. Right Rear Quarter Panel Drop: Right rear quarter panel must extend 27 inches down from deck without plastic, or 31 inches with plastic.
  • m. Deck Height: Deck height at nose piece splitter maximum 15 inches. Deck height 39 inches from rear deck top to ground.
  • n. Plastic Quarter Panels: Plastic quarter panels permitted on right side only.

H. Right Side Body

  • a. Top Straightness: Quarter panel, door (to firewall) must be within 1 inch of a straight line at body top.
  • b. Vertical Straightness: Quarter panel, door, and fender (to fender top) must be within 2 inches of a vertical straight line at body top.
  • c. Skirting Straightness: Quarter panel and door must be within 1 inch of a straight line where skirting joins door and quarter panel.

I. Spoilers, Spoiler Braces and Spoiler Supports

  • a. Spoiler Material: Only aluminum rear spoilers permitted. 21-inch plastic breakaway panel allowed. Spoiler sides and braces must be aluminum.
  • b. Spoiler Dimensions: Maximum 8 inch overall spoiler height. Maximum 72-3/8 inch spoiler width including braces/supports.
  • c. Spoiler Mounting: Rear spoiler must start at deck and extend 8-1/4 inches from that point, including mounting hardware. No wing-type suspension.
  • d. Spoiler Start Point: Rear spoiler must begin at quarter panels’ rearmost point.
  • e. Spoiler Braces: Maximum three spoiler braces/supports allowed. Front edge aligned with spoiler.
  • f. Outer Supports: Outer spoiler supports maximum width at quarter panel tops and centered on rear deck.
  • g. Angle Braces: Aluminum angle braces must not add to spoiler height/length.
  • h. Single Plane Spoiler: Spoiler must be single plane from top to bottom.
  • i. Offset Sides: No offset spoiler sides permitted. Each side must be positioned at the same place at the T-bar on both sides.

J. Interior

  • a. Interior Drop: Interior can be dropped maximum 5 inches below door tops and minimum 12 inches below roll cage to car middle (behind seat).
  • b. Side Window Opening: Side window opening 15 inches from door top to roof bottom.
  • c. Right Window Obstructions: Support bars blocking driver exit through right window prohibited.
  • d. Rock Guard: Rock guard (Lexan screen) maximum 7 inches high, no further back than right-side headrest front edge, tapering to deck at seat back.
  • e. Firewall Drop Fill: If interior dropped at firewall/hood back, firewall portion must be vertically filled with aluminum, interior drop maximum 2 inches from hood top.
  • f. Interior Fastening: Interior must be flush fastened at door/quarter panel tops, tapering gradually towards car center at maximum 70-degree angle from deck.
  • g. Rear Interior Line: Interior must run straight line (vertical and horizontal) across car rear at spoiler.
  • h. Interior Material: All interiors must be made of aluminum.

K. Driver Compartment

  • a. Firewall: Full metal firewall (magnetic steel or aluminum) encompassing driver compartment front to rear, sides and floorboards.
  • b. Steering Wheel: Quick-release, full circle steering wheel mandatory.
  • c. Mirrors: Mirrors of any type prohibited.
  • d. Radios: Radios or electronic/data communication devices prohibited.
  • e. Sharp Edges: Edges/sheet metal in/around driver compartment must be trimmed/beaded and rounded, no sharp or protruding edges.
  • f. Rock Guard Roll Bars: Rock guard with minimum three additional roll bars must be mounted in front of driver.
  • g. Cockpit Adjustments: Cockpit adjustable components prohibited except brake bias adjusters. Adjusters (shocks, weight jacks, trackers, ignition boxes, etc.) prohibited inside cockpit or within driver reach.

L. Body Skew

  • a. Diagonal Measurement: Left rear quarter panel measurement from hub center to rear cannot exceed 54 inches. Measuring 72 inches from left rear quarter panel to right rear quarter panel, then 96 inches forward along right door, diagonal measurement to left rear quarter panel top must be minimum 117 inches.

Section 9 – Brakes, Brake Components, and Wheel Hub

A. Braking System: Must have sufficient four-wheel braking system. On-track three-wheel braking allowed.
B. Brake Calipers: Brake calipers must be made of aluminum.
C. Caliper Integrity: Brake calipers, including pistons, must be used as produced by the manufacturer.
D. Brake Rotors: Brake rotors must be made of magnetic or stainless steel.
E. Rotor Integrity: Brake rotors must be used as produced by the manufacturer.
F. Wheel Hubs: Wheel hubs must be made of aluminum or magnesium.
G. Hub Integrity: Wheel hubs must be used as produced by the manufacturer.
H. Hub Assembly Weight Limit: Combined weight of wheel hub, bearings/seal, spindle nut/washers, brake rotor/hardware, axle cap, and wheel spacer must not exceed 27 lbs.

Section 10 – Suspension, Suspension Components, Springs, Shocks, and Steering

Any and all new designs or modifications to an existing suspension and/or suspension component must be communicated to and approved by the Series Director before being used in competition.

A. General

  • a. Suspension Evolution: Rear suspension designs and applications are constantly evolving. Rules aim to accommodate current designs but cannot be absolute.
  • b. Rear Springs: Rear suspension must use coil or leaf springs.
  • c. Rear Suspension Configuration: Rear suspension on current/new chassis must be four-link design. Older cars with other designs may be allowed at Series Director discretion until further notice.
  • d. Swing Arm/Z-Link: Swing arm and Z-Link suspension types permitted. Shock on swing arm or z-link may mount to birdcage or bottom radius rod. Top/bottom solid links must be mounted on hiems and run opposite birdcage direction.
  • e. Bump Sticks: Bump sticks are prohibited anywhere on the car.

B. Front Suspension

  • a. Type: All cars must use independent front coil spring suspension with right/left lower control arms, upper control arms, spindles, shocks, and springs/spring stacks.
    • i. Lower Control Arms: Must be magnetic mild steel or 4130 chrome moly tubing.
    • ii. Design: Lower control arms can be A-frame with two inner pivots or Ford design with one inner pivot and strut rod for fore/aft securing. Strut rod can mount forward or rearward.
    • iii. Frame Mounts: Lower control arm frame mounts must be welded to frame rails. (Right to right, left to left).
    • iv. Mount Position: Lower control arm inner pivot mounts must remain outside front frame centerline.
    • v. Adjustable Mounts: Lower control arm inner pivot frame mounts may be adjustable via:
        1. Series of single round holes.
        1. Machined slot for steel “slug” with single round mounting hole.
    • vi. Secure Mounting: Both methods must produce secure, non-moveable mounts when assembled and tightened.
    • vii. Upper Control Arms: Must be magnetic mild steel or 4130 chrome moly tubing.
    • viii. Design: Upper control arms can be A-frame (with or without shaft) or individual tube type with individual inner pivot mounts.
    • ix. Frame Mounts: Upper control arm frame mounts must be welded to frame rails. (Right to right, left to left).
    • x. Adjustable Mounts: Upper control arm inner pivot frame mounts may be adjustable via:
        1. Series of single round holes.
        1. Machined slot for steel “slug” with single round mounting hole.
        1. Machined slot with capture eccentric (cam) type adjuster.
    • xi. Secure Mounting: All methods must produce secure, non-moveable mounts when assembled and tightened.
    • xii. Spindles: Must be fabricated or forged magnetic mild steel.
    • xiii. Steering Arms: If separate, spindle steering arms must be welded to the spindle.
    • xiv. Steering Arm Position: Steering arms must remain below the spindle pin.
    • xv. Connections: Spindles must connect to upper and lower control arms via ball joints, mono-balls, or spherical rod ends.

C. Rear Suspension Frame Mounts

  • a. Integral Brackets: Frame/roll cage structure must have integral welded mounting brackets for rear suspension components. Frame suspension mounts may be welded or securely bolted (without movement).
  • b. Materials: Only magnetic steel or aluminum allowed for frame suspension mounts.
  • c. Double Shear Configuration: Frame suspension mounts must be double shear for suspension component mounting. Shear mounts must use minimum 5/8 inch rod ends with minimum 1/2 inch grade eight (8) bolts only, bolted through both shear mounts.
  • d. Mount Dimensions: Double shear frame suspension mounts must be minimum 3/16 inch thickness on both sides, maximum 4 inches wide, with minimum 1/2 inch grade eight (8) bolt with steel or aluminum spacers only.
  • e. Mounting Holes: All frame suspension mount component mounting holes must be round and correctly sized for fasteners. Clearance must not exceed next fractional drill size (e.g., 1/2 inch fastener, 33/64 inch hole).

D. Axle Housing Mounts

  • a. Mount Quantity: Only one axle-housing mount per side allowed.
  • b. Materials: Only aluminum or magnetic mild steel allowed for axle housing mounts (birdcages). Exotic heavy materials prohibited.
  • c. Design Similarity: Axle housing mounts must be functionally similar in design between right and left sides.
  • d. Type: Axle housing mounts can be solid (welded) or floating (birdcage) design.
  • e. One-Piece Mount: Assembled axle-housing mount must be one-piece. Two-piece floating mounts must create a common one-piece pivot (barrel) and be fastened/welded to prevent independent movement. Mount must attach directly to axle tube with rotation clearance only, no fore, aft, or vertical movement.
  • f. Radius Rod Mounts: Mounts for suspension attaching (radius) rods must be integral to axle-housing mount, single or double shear. Single shear: minimum 1/4 inch magnetic steel or 1/2 inch aluminum. Double shear: minimum 3/16 inch magnetic steel or 1/4 inch aluminum. No dynamic movement other than rotation/pivot from suspension travel.
  • g. Component Mounting Restrictions: Mounting components other than radius rods or shocks on axle housing mounts is prohibited unless authorized by the Series Director.

E. Rear Suspension Attaching (Radius) Rods

  • a. Rod Quantity: Maximum two attaching (radius) rods per side allowed.
  • b. Materials: Only magnetic steel or aluminum allowed for radius rods.
  • c. Rod Type: Radius rods can be solid or tubular, round or hexagon shaped, except:
    • i. Earnhardt Technologies Group Lower 4-Link Rod, Billet Aluminum Part # ETG-1248.A.00-ASM, permitted.
    • ii. Wehrs Machine & Racing Products Part # WEH-WM625BB, permitted.
  • d. Rod Ends: Spherical rod ends or steel clevises must be used at each rod end for pivoting, static length adjustment, and mounting. Bushings prohibited.
  • e. Dynamic Length Adjustment: Assembled radius rods must not have dynamic length adjustment capabilities.
  • f. Rod End Sizes: Spherical rod end sizes minimum 5/8 inch rod end body with 1/2 inch bearing to maximum 3/4 inch rod end body with 3/4 inch bearing.
  • g. Fastener Sizing: Correct fastener size must be used for spherical rod end mounting (e.g., 1/2 inch fastener with 1/2 inch bearing/hole). Metal step spacers allowed to reduce spherical rod end bearing hole size.
  • h. Mounting Points: Radius rods must mount directly to frame suspension mount at forward end and axle-housing mount at rearward end.
  • i. Fasteners: All rear suspension fasteners must be magnetic steel, minimum 1/2 inch diameter. Grade eight (8) fasteners recommended. Correct fastener sizes for component and application use required.
  • j. Spacing: Completed rear suspension assembly:
    • i. Radius rods must be spaced minimum 6 inches apart on the frame.
    • ii. Radius rods must be spaced minimum 6 inches and maximum 12 inches apart on the birdcage.
    • iii. Measurements taken from radius rod bolt centers.
  • k. Straight Rods: All radius rods must be straight except left lower, which can have a bend for axle housing mount clearance.
  • l. Weight Limit: Radius rods must not exceed 3 lbs. including all hardware.

F. Rear Travel Limiter (Droop Rule)

  • a. Chain Installation: Vertical travel limiting chain mandatory on left rear from axle housing to frame. Chain attaches to bearing-type mount or clamp-mounted bracket at 12 o’clock on left rear axle tube, between birdcage and axle housing bell edge, and to left rear frame directly above. Chains must be vertical when taut. One compliance device allowed, maximum 1 inch thick (unloaded), fully open and visible. Compliance devices can be rubber or similar solid material, no canisters, springs, spring-loaded, pneumatic devices, tapered, beveled, or roller skate type rubber. Solid material must be same diameter top to bottom, not hollowed/drilled.
  • b. Droop Measurement: Travel limiting chain including compliance rubber must be tight when car is jacked from rear. Jack car on under-slung frame rail 1 inch in front of rear axle tube, between axle center and panhard bar mount, until 0.040 inch shim slides between left rear tire and ground. Vertical measurement from ground to top trailing edge of rear deck bar, 6 inches inboard of left rear quarter panel outer edge, must not exceed 51 inches.
  • c. Droop Limiter Strength: Droop limiter assemblies must support unsprung rear-end mass, stretched value no more than 3/4 inch at 1,200 lbs. Procedure: 100 lbs. preload, zero distance, pull to 1,200 lbs.

G. Torque Control Devices

  • a. Devices Permitted: Lift arm assemblies and pull bars permitted.
  • b. Quantity Limit: Only one torque control device allowed.
  • c. Lift Arm Mounting: Lift arms must attach to axle housing to prevent movement, gusset/brace bar allowed for side-to-side flex prohibition.
  • d. Forward End: Forward end of lift arm can use spring over shock (fifth coil), spring or bushing, and limiting chain.
  • e. Pull Bar Adjustments: Pull bars adjustable at both ends, but adjustments must be fixed during competition. Driver-reachable adjustors prohibited. Hydraulic/pneumatic pull bars prohibited.

H. Springs

  • a. Front Springs: Front suspension must use magnetic steel coil springs.
  • b. Rear Springs: Rear suspension may use coil or leaf springs. Coil springs must be magnetic steel. Leaf springs can be magnetic steel or composite.
  • c. Coil Spring Configuration: Coil springs can be used individually or stacked.

I. Shock Absorbers

  • a. Shock Function: Shocks dampen and control spring frequencies in compression and rebound. Force to move piston/shaft can vary with shock “builds,” but piston/shaft must move in both directions.

  • b. Shock Type: Mono-tube, single-piston, nitrogen gas-charged shocks permitted. All shocks must use mechanical oil controls (spring shims, drum/disc, check ball/spring, needle/seat) for internal/external adjustments. Magnetic/electro-magnetic controls prohibited. Remote nitrogen gas reservoirs with compression adjusters permitted. Only these adjustments allowed.

  • c. In-Motion Adjustments: Shock adjustments while vehicle is moving prohibited.

  • d. Materials: Shocks and components must be steel or aluminum.

  • e. Rotating Parts: Rotating parts prohibited inside or mounted to shocks. Inertia/gyro-style shocks prohibited.

  • f. Thru-Rod Shocks: Thru-rod shocks prohibited. Shock shaft cannot exit both oil volume sides. Shocks with dampening piston >1.5 inches beyond shaft end, allowing shaft to pass through body on both ends simultaneously, classified as thru-rod/thru-shaft.

  • Caption: Side view illustration of a dirt late model race car, showcasing key components and dimensions as per the 2024 Unified Rules.

  • g. Mounting Angle: Shocks must be mounted as close to vertical as possible unless authorized.

  • h. Approved Locations:

    • i. One shock per front wheel.
    • ii. One shock at right rear wheel.
    • iii. Two shocks at left rear wheel. One behind axle tube, one on top/forward of axle tube.
    • iv. One mid-ship shock at front of lift arm assembly.
    • v. One braking shock, within 3 inches of rear axle center section centerline, mounted horizontally.

  • i. New Shock Approval: New shock designs must be submitted to Series Director for approval before competition. Manufacturers may need to provide component boards for inspection/display.

  • j. Air Shocks: Air shocks permitted.

  • k. Body Diameter: Maximum shock body OD 2-1/2 inches.

  • l. Front Shock Length: Maximum front shock length 21 inches, center to center of shock eyes.

  • m. Rear Shock Length: Maximum rear shock length 27 inches, center to center of shock eyes.

  • n. Electronic Dampers: No electrically adjusted or active dampers allowed. No electrical wires, transmitting, or receiving components internally/externally on dampers or inside any component or dampers. No car portion (shocks, springs, chassis, etc.) can communicate, transfer, transmit, receive data, or adjust/monitor via wireless/mechanical remote devices, phones, computers, tablets.

  • o. Suspension Covers: Suspension covers not allowed. Rear covers outside pit area not allowed. Spring/shock covers permitted if fastened directly to spring/shock.

Section 11 – Steering Components, Wheels, and Tires

A. Steering Components

  • a. Power Steering: Only one power steering pump allowed. Electronic steering/components prohibited.

B. Wheels

  • a. Material: Only aluminum wheels permitted.
  • b. Mounting: Wheels must be lug nut mounted to hubs. “Knock off” or single-type wheel mounting systems prohibited.
  • c. Width: Only 14-inch wide wheels permitted. Using wider/narrower wheels prohibited.
  • d. Wheel Assembly Weight Limit: Combined weight of wheel, hardware, wheel disc/fasteners, and tire must not exceed 40 lbs.
  • e. Track Width: Maximum front track width 90 inches, maximum rear 88 inches, tire outside edge to outside edge.
  • f. Wheel Discs: Only approved wheel discs permitted, fastened with minimum three 1/4 or 5/16 inch hex head bolts. Other fastener types prohibited.
  • g. Wheel Spacers: Only aluminum wheel spacers permitted.
  • h. Wheel Bleeders: Wheel/air bleeders prohibited.
  • i. Lug Nuts/Bead Lock Bolts: Titanium Lug Nuts and Bead Lock Bolts are permitted.
  • j. Wheel Weights: Wheel weights prohibited.
  • k. Left Rear Mud Guards/Covers: Left Rear Mud guards/covers, regardless of weight, must be approved by Series Technical Director/Series Director.
    • i. Mud guard/cover and components (guard/cover, bracket, bolts) maximum 10 lbs., 1/4 inch thickness.
    • ii. Mud guard/cover must slide over axle tube, fastened with two 1/2 inch Grade 5 or higher bolts.
    • iii. Mud guard/cover material must be aluminum or magnetic mild steel. Exotic heavy materials prohibited.

C. Tires

  • a. National Late Model Tire (NLMT) Rule:

    • i. Right Rear: Only Hoosier (92) NLMT2, (92) NLMT3, (92) NLMT4 selected.
    • ii. Fronts/Left Rear: Only Hoosier (90) NLMT2, (90) NLMT3 selected.

  • b. Maximum Tire Size: Maximum tire size 11 inches x 29 inches x 15 inches, unless specified otherwise.

  • c. Maximum Circumference: Maximum outside tire circumference 93 inches, unless specified otherwise.

  • d. Maximum Width: Maximum tire width 16-3/4 inches, sidewall edge to edge across tire face. Tire must pass through tire hoop freely without manipulation/contact.

  • e. Tire Rule Amendments: Tire rule may be amended, competitors will be notified.

  • f. Tire Alterations: Chemical alterations, vulcanizing, softening, defacing, or altering tire lettering/stamping prohibited. Chemical or tire softening prohibited at any time.

  • g. Tire Washing/Spraying: Washing tires or spraying substances prohibited within three (3) hours of scheduled hot lap time. Dipping tires in containers (swimming pools) and chilling/heating (freezers, ice baths, torches, direct heat) prohibited at any point. Violations result in indefinite suspension for involved individuals, associated driver, and car owner from WRG/Lucas Oil Late Model Dirt Series events. Vehicles (haulers, support trailers) subject to search at Series Director/Technical Director discretion. Tires not permitted to be transported in/out of pit area confines.

  • Caption: Illustration showing various quarter panel options and specifications for dirt late model race cars, as per the 2024 Unified Rulebook.

  • Caption: Detailed side view specification drawing of a dirt late model car, outlining critical dimensions and measurements for compliance with 2024 racing regulations.

Section 12 – Safety Equipment

A. Seat Belts and Restraint Systems

  • a. Specifications: Minimum SFI 16.1 or SFI 16.5 approved restraint system mandatory. Valid until expiration date or two (2) years from manufacture date. Install/use per manufacturer instructions.
  • b. Fasteners: Manufacturer-supplied fasteners must be used for any installation type.
  • c. Material Contact: Seat belt material should not contact sharp/metal edges, including seat pass-throughs.

B. Seats

  • a. Type: All current seats must be full containment, aluminum or approved carbon fiber, SFI 39.2 compliant. Design must include head surround, shoulder/torso support, energy impact foam, and removable head foam.
  • b. Carbon Fiber Certification: Carbon fiber seats must have current valid SFI 39.2 certification.
  • c. Seat Integrity: Seats must be used as supplied and installed per manufacturer instructions.
  • d. Seat Mounting: Seats must be mounted to a seat frame welded to car frame/roll cage. Attaching points, angles, and materials for seat frame and seat mounting must follow manufacturer instructions.
  • e. Mounting Brackets: Seat mounting brackets must use correctly sized bolts/washers for bracket holes. No oversized or slotted holes.

C. Fire Suppression

  • a. System Type: Thermally deployed automatic fire suppression system mandatory. DOT-approved cylinder (aluminum or steel), 10 lbs. fire extinguishing agent, steel/steel reinforced lines, minimum two (2) thermally activated discharge nozzles.
  • b. SFI Specification: All systems must meet or exceed SFI 17.1 specifications.
  • c. Agent and Labeling: Systems must be fully charged with 10 lbs. DuPont FE-36, 3M NOVEC 1230, FireBull, or 4Fire, with legible valid SFI and manufacturer label showing agent, capacity, certification date. Cylinders past certification must be inspected, serviced, and relabeled by manufacturer.
  • d. Cylinder Mounting: Cylinders must be mounted forward of fuel cell, securely to frame/roll cage. Certification label unobstructed and accessible.
  • e. Nozzles: Two (2) thermally activated nozzles mandatory. One above fuel cell in fuel cell area, one in driver cockpit. Optional engine bay nozzle.
  • f. Manual Override: Optional manual override cable allowed.

D. Window Nets

  • a. Specifications: Window nets certified to SFI Spec 27.1 or safety nets certified to SFI Spec 37.1 recommended, must be mounted per manufacturer instructions.

E. Helmets

  • a. Safety Rating: All drivers must wear full-face helmets with minimum safety rating FIA 8860-2010, FIA 8860-2018, Snell SA 2015, Snell SA 2010, Snell SAH 2010, and/or valid SFI 31.1/2005 label.

F. Head and Neck Restraints

  • a. Requirement: Drivers must have helmets correctly connected to approved head and neck restraint at all times on track, per manufacturer instructions.
  • b. SFI Approval: Head and neck restraints must be SFI 38.1 approved with legible valid SFI 38.1 label.

G. Protective Clothing

  • a. Driving Uniform: All drivers must wear fire-resistant driving uniform meeting minimum SFI 3.2A/5 specifications with valid SFI 3.2A/5 label.
  • b. Gloves: Drivers must wear gloves on track, meeting or exceeding SFI 3.3 specification with valid SFI 3.3 label.
  • c. Shoes: Drivers must wear shoes meeting minimum SFI 3.3 specifications with valid SFI 3.3 label.

Section 13 – Electronics, Gauges, and Dash Modules

A. Two-Way Communication: Two-way communication devices in/on race vehicle or driver prohibited.
B. Cellular/Satellite/Wi-Fi Devices: Cellular, satellite, and wi-fi devices in/on race vehicle or driver prohibited (including cell phones/smart watches).
C. Antennas: Antennas prohibited in/on race vehicle or carried by driver.
D. Vehicle Position Systems: All forms of vehicle position systems (GPS) prohibited.
E. Lap Timing Devices: Only approved lap timing/recording devices (transponders) permitted.
F. Engine Gauges: Permitted gauges limited to monitoring:

  • a. Oil Pressure
  • b. Oil Temperature
  • c. Engine Coolant Pressure
  • d. Engine Coolant Temperature
  • e. Fuel Pressure
  • f. Battery Voltage
  • g. Engine RPM

G. Electronic Gauge Inputs: Electronic gauges (analog/digital), except tachometers, only allowed one input from sensor. No gauge output permitted. Tachometers can record RPM for recall/playback.
H. Electronic Dash Modules: Electronic dash modules in lieu of individual gauges only allowed inputs as described above. All other input channels must be disabled/blocked. Only engine RPM recording permitted. Wiring must be accessible/removable for inspection.
I. Additional Wiring Harnesses: All additional wiring harnesses related to electronic dash modules or data acquisition must be completely removed during events.

Section 14 – Miscellaneous

A. Car Covers: Full/partial car covers permitted only during inclement weather.
B. Fire Extinguisher Recommendation: Teams recommended to have fire extinguisher (minimum 2.5 gallons A-FFF or 20 lbs. Purple-K) in transporter rear.
C. Camera Mounting Restrictions: Cameras/video recorders/photographic equipment cannot be mounted below car deck.
D. Driver Electronic Devices: No driver-controlled electronic devices, computer-controlled devices, or cellular devices permitted in cockpit on track.
E. Data Systems: No data systems or data collection harnesses permitted.

*   ![Dirt Late Model Spoiler Supports](http://autotippro.com/wp-content/uploads/2025/02/2024-unified-rules-spoiler-supports.jpg){width=2560 height=1978}
*   *Caption: Diagram illustrating approved spoiler support configurations and dimensions for dirt late model cars, as per the 2024 regulations.*

Section 15 – Series Decals and Patches

A. Decal Display: All participants must display provided decals per verification sheet before competition. Failure results in loss of awarded money/products.
B. Decal Requirements: World of Outlaws Late Model Series decal (minimum 60 sq. inches) and Contingency decals (minimum 28 sq. inches) required visible on both car sides for cash/product awards, no exceptions. Series decal location at front a-post base on door panel (front fender above wheel well). Contingency decals on lower door panels above skirt (12 inches above skirt), overflow to rear quarter panel lower third. No alterations or size adjustments to decals/logos in wraps. Minimum size requirements must be met. Mandatory series logo placement on full-time LMS teams, driver websites, and social channels.
C. Driver Uniform Decals: World of Outlaws Late Model Series logo must be on right or left front upper chest of driver uniform, and on both sleeves. Failure results in point deduction at Series Director discretion.
D. Contingency/Sponsorship Awards: Teams participating must meet award requirements (decals, patches, product use, verification). Written deadline for requirements provided before each season start. Existing programs roll over from prior season, starting at season’s first race.
E. Advertising/Sponsorship Approval: World of Outlaws Late Model Series Officials can refuse participant competition if advertising/sponsorship is detrimental to sport, World of Outlaws Late Model Series, event promoter, World Racing Group, or sport image.
F. Victory Lane Participation: Top three Feature finishers must proceed to victory lane after weighing for all activities (photos, interviews, etc.). Failure results in minimum $500 fine, extenuating circumstances considered.
G. Team Transporter/Souvenir Trailer Decals: Team Transports and Souvenir Transport/Trailers (commercial vehicles) must display World of Outlaws Late Model Series logos in three locations (driver side, passenger side, tailgate). Team Transports: 24” wide x 27” tall. Souvenir Trailers: 18” wide x 24” wide.
H. Rule Non-Compliance Penalties: Failure to comply with these rules may result in loss of point fund monies, purse monies, and/or other penalties as deemed necessary by World Racing Group and/or World of Outlaws Late Model Series Officials.

*   ![2024 Late Model Logo Placement Diagram](http://autotippro.com/wp-content/uploads/2025/02/2024lmlogoplacementdiagram-j1631-1-scaled.jpg){width=1812 height=2560}
*   *Caption: 2024 Late Model Series logo placement diagram, illustrating the designated areas for series and contingency decals on race cars to ensure visibility and compliance.*

Section 16 – Drawings

*   ![Dirt Late Model Top View](http://autotippro.com/wp-content/uploads/2025/02/2024-unified-rules-top-view.jpg){width=2560 height=1978}
*   *Caption: Top view drawing of a dirt late model race car, providing a visual guide to the car's overall layout and dimensions as defined by the Unified Rules.*

*   ![Dirt Late Model Car Side View](http://autotippro.com/wp-content/uploads/2025/02/2024-unified-rules-master-side-view.jpg){width=2560 height=1978}
*   *Caption: Detailed side view illustration of a dirt late model race car, highlighting key components and specifications according to the 2024 Unified Rules.*

*   ![Dirt Late Model Quarter Panel Options](http://autotippro.com/wp-content/uploads/2025/02/2024-unified-rules-quarter-panel-options.jpg){width=2560 height=1978}
*   *Caption: Drawing showcasing different quarter panel options and specifications for dirt late model race cars, adhering to the 2024 Unified Rulebook guidelines.*

*   ![Dirt Late Model Side View Specifications](http://autotippro.com/wp-content/uploads/2025/02/2024-unified-rules-side-view-specifications.jpg){width=2560 height=1978}
*   *Caption: Technical side view specification drawing of a dirt late model car, delineating crucial dimensions and measurements for compliance with 2024 racing regulations.*

*   ![Dirt Late Model Spoiler Supports](http://autotippro.com/wp-content/uploads/2025/02/2024-unified-rules-spoiler-supports.jpg){width=2560 height=1978}
*   *Caption: Diagram illustrating the approved configurations and dimensions for spoiler supports on dirt late model cars, as mandated by the 2024 rule set.*

VI. Conclusion: Staying Compliant with DIRTcar Regulations

This comprehensive rulebook for the 2024 DIRTcar Late Model Series provides essential guidelines for all participants. Understanding and adhering to these regulations is crucial for fair competition, safety, and the integrity of the sport. From technical specifications to racing procedures, every aspect is covered to ensure a level playing field and exciting dirt track racing events. Always refer to the latest official rulebook updates and clarifications from the World Racing Group and DIRTcar officials to remain compliant and competitive throughout the racing season.

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