The rules and/or regulations set forth herein are designed to provide for the orderly conduct of racing events and to establish minimum acceptable requirements for such events, and by participating in these events, all participants are deemed to have complied with these rules.

Competitive racing can result in injury and/or death to the participant. No expressed or implied warranty of safety shall result from publications of, or compliance with these rules, and/or regulations. They are intended as a guide for the conduct of the sport, and are in no way a guarantee against injury or death to a participant, spectator, or official.

The promoter shall be empowered to permit minor deviation from any of the specifications herein, or impose any further restrictions, that in his opinion do not alter the minimum acceptable requirements. No expressed or implied warranty of safety shall result from such alteration of specification. Any interpretation or deviation of these rules is left to the discretion of the officials. Their decision is final.

The management of Texas Thunder Speedway:

            Track                                                   (254)628-2888

            Promoter, David Goode                     (254)289-9657

            Front Gate, Amanda Bauser               (254)291-1836


No individual under the age of 16 will operate any ATV, motorcycle, electric vehicle, etc., without written permission from management. All above mentioned vehicles must be registered with the front gate.

No individual will operate any non-licensed vehicle 30 minutes after the race program, i.e., four wheelers, golf carts, mules, etc.

**Fines Will Be Assessed For Speeding On The Premises!!


The management of Texas Thunder Speedway reserves the right to alter the race program at any time for the improvement of the quality and/or convenience of the night’s scheduled events

Notice: all classes of cars are required to run IMCA approved mufflers with turn downs directing exhaust to the ground.

All aftermarket fuel cells must have a flapper device to prevent fuel from leaking in case of a rollover and loss of fuel cap.

No two-way communication of any kind allowed


Anyone entering the racetrack premises does so at his/hers own risk. Everyone entering the pit gate must personally sign a release. The insurance carrier may determine the minimum age requirements.

Everyone in the pit area is responsible to the pit steward at all times during a race program. The flagman has complete control of the cars during the race. Decisions of the speedway personnel are official and final. Management is not responsible for accidents of any nature, or damage incurred, or for loss by theft while on the premises of Texas Thunder Speedway.

The track officials reserve the right to refuse entrance to any car, driver, owner, or any other person or persons to the pit area, infield or grandstand area.


Absolutely no drugs or alcoholic beverages will be consumed in the pit area by anyone before and during the race program. The race program will end after the last race has been completed and all cars have left the racing surface. Exceptions to the end of the race program will be posted and track official will notify all personnel at the racetrack. The speedway officials reserve the right to search all vehicles entering the pit area. Any person in the pit area with alcohol on their breath will be immediately removed from the pit area for the remainder of the race program. A second offense will result in a permanent suspension from the pits.


1.  The management will carry insurance. No claims will be paid for any injuries unless these injuries are reported before leaving the premises on the day or night the injury occurred. The track management will file the initial claim. After the claim is filed, it becomes the individual’s responsibility to fill out papers and forms and send all bills to the insurance company. Texas Thunder Speedway will provide an ambulance on site. If the ambulance’s services are required, it becomes that individual’s financial responsibility for treatment and/or transport costs.  Injuries sustained from fighting will not be covered by insurance. Those persons injured while under influence of alcohol or drugs forfeit all rights to any insurance claims. 

2.  Insurance regulations forbid anyone under 14 yrs. old without track approval from riding in a race car at any time.

3.  No one shall claim any damages against a speedway official for reasons of disqualification or damages to property not covered under current insurance policy.


1.  IMCA classes reference IMCA rules. Protests must be filed with the tech official prior to the start of the feature race for each class with reasonable time so inspection can take place. The protest fee, ($25) in cash, by the registered driver filing the protest will be given to the technical official and cannot be withdrawn. This protest is a visual protest only. A tear-down protest fee is $100 cash, after the feature event, for transmission and rear gear only. The protesting driver must be competing in that evening’s race program in the class they wish to protest. Upon request, the protested car must report immediately to the designated inspection area. If the protested car is illegal, the money is returned to the person filing the protest, and the illegal car forfeits all winnings and points for that program. If the protested car is legal, then the protested car retains the entire protest fee. No protested car may leave the premises prior to checking the protests without forfeiting their winnings. Protested driver/car may not switch cars in the feature event. 

2.  If Disqualified for weight, drivers may pay $50 protest fee and scale will be checked on the spot. If scale is proven wrong, position is reinstated and fee is reimbursed. If scale is right, DQ remains and track retains protest fee.

3. Prior to a protest any car found to be illegal by track officials during the heat races may change the illegal part. Any car found illegal during the feature race will forfeit all points and money for that night’s races.


The management will give any participant starting a fight, or conducting themselves in a manner detrimental to the speedway, or to the sport of auto racing, a penalty/fine. The guilty party will be notified by the management for impending penalty/fine before the next race night. A second penalty will result in a heavier penalty/fine. Any abuse of a track official is grounds for permanent suspension.


1.      A black flag is a signal to the driver that he has a problem. The driver must proceed to the red/yellow area where he will be informed of the nature/reason for the black flag. The flagman has the authority to assess track penalties at his own discretion. Track penalties range from a warning; put to the rear of the field, and/or disqualification from event. Any car disqualified for rough driving or unsportsmanlike conduct will not be paid for that event and must be re-inspected and approved by the technical inspector before entering any future events.

2.      Any driver disregarding a black flag more than twice in a race may be disqualified, receive no winnings for that event and suspended for the remainder of the night. Disqualification of a driver could result in a disqualification of the car he is driving for the remainder of the night.

3.      No one will be allowed to enter a race from the pit area after the green flag has dropped.

4.      A green/yellow light will be used in the event of a situation where caution is needed to alert all drivers. Race will continue under green/yellow. 

5.      In the event of a red flag/light, all cars must stop as soon as possible. Once the cars are realigned and moved out on the parade lap, any car not in the lineup will go to the rear of the field. Cars may re-enter the race after entering the red/yellow area and completing repairs. Any car entering the pit parking area and attempting to return to the racing surface will be disqualified. No work can be done on a racecar during a red flag.

6.   A yellow flag will be used to clear the track of minor accidents. Any car involved in a yellow flag which ends up stopped on the track or needs assistance will be put to the rear of the field as determined by the flagman. Under a yellow flag condition, all cars must reduce their speed to a slow pace and fall in to position with no passing. The official line-up will be the leader alone on the front row and all trailing cars aligned two abreast determined by the last completed lap under the green flag. 

7.   Cars cannot enter the red/yellow during the heat races. Cars may enter the designated red/yellow area at any time during a feature event. By entering the red/yellow work area on a yellow flag condition, that driver forfeits their restart position and must go to the rear. Cars cannot go to their trailer and return to the event.

8.      Any identifiable part falling off of a race car causing a yellow flag will result in that car going to the rear.

 9.      At the discretion of the officials, any single car causing a yellow flag in an event will be removed from the race and scored at that point.

 10.  The flagman has the authority to start any event whether all cars called to the track are ready or not. Cars that don’t take their position when called go to the rear. Flagman may decide to realign single file restarts.


1.      Any driver who changes cars will start on the back of the event for which that driver qualified. Driver returning to their original car will start on the back of their scheduled event. 

2.   Any driver change without notifying speedway officials will result in disqualification of the driver and car, forfeiture of winnings in that event, and suspension for the remainder of the race night.


      Unofficial results will be posted as soon as possible after each event. If no dispute of the finishing order has been made within 30 minutes, results become official. Driver or owner should pickup winnings within 30 minutes of announcing the official results of the last event of the night. Individual picking up purse money must present a pay card and sign their own name legibly. Individual picking up any purse must verify the amount of money in that envelope before leaving the front gate pit window. No exceptions! Money not picked up within the time limit will be held until the following week’s races. Purse not picked up within a four week period will be forfeited and donated back to the track.


1.      The only people allowed on the racetrack and infield during event are racing officials unless requested to assist for some special reason. Drivers may seek a place of safety in the infield following disablement. Drivers are not to work on or examine disabled cars in the infield during a race event. Only wrecker and safety crews will be allowed on the race track in the event of an accident. Any driver exiting their car during an accident will be immediately disqualified.

2.      A car cannot compete in two classes during the same night.


1.   All scoring will be electronically scored. So each race vehicle must have a transponder during all race day events.

2.   Transponders may be rented at Drivers Check In building at $10.00 per event, prior to races starting.

3.   Transponders must be mounted no further forward than the steering gear box.


1.   Raceceivers are required for all classes except Texas Twisters.

2.   Raceceivers may be rented at Drivers Check In building at $15.00 per event prior to races starting.


Speeding in pit area will not be tolerated. Speed is 5mph. Any race vehicle, ATV, etc. caught speeding will be liable for a cash fine of $25.


An event is considered to be rained out only if heat races are not finished. Refunds will not be given, only a pass to come back on another scheduled race event. In case of rainout, events will be rescheduled to the next possible race date available. TTS reserves the right to change the rainout policy. 


1.      The technical inspector will oversee all engine claims. His rulings are final. Claim rule is not in effect on first two track point nights. No driver may claim unless they have competed at all previous weekly track “point” events. Exception is if you have been claimed at this track, you do not need perfect attendance.  

2.   A car/driver that wants to claim must remain on the racing surface and move to claim area immediately following the race. Driver wanting to claim takes the checkered flag and must not pass flag stand/ finish line a second time. Driver must have a claim card/license and exact money in his possession during the race. Any questionable areas, IMCA rules apply.

3.   Drivers that allow their engine to be claimed will have their cars impounded by the technical inspector. No work will begin until cleared the technical inspector.

4.   Engines will be pulled as soon as possible.

5.   The driver/owner and three individuals from the car with the engine being claimed, one person from the car making the claim and one wrecker crew are the only non-track officials allowed in or near the general vicinity of the claim/work area. Unsportsmanlike conduct during claim procedure will result in a $100 fine and/or suspension.

6.   No alcoholic beverages will be consumed in the work area.

7.   A.    $550.00 cash claim on engine, $25.00 goes to wrecker for pulling engine.

      B.    Claim does not include clutch, pressure plate, bell housing, exhaust, carburetor, starter, motor mounts, sending units, and switches for oil pressure and water temp, carburetor adapter, fan and pulleys, clutch ball, clutch arm, throw out bearing, dip stick, water pump, plug wires, oil cooler, valve cover breathers, distributor or fuel pump.

      C.    First 4 position finishes are subject to engine claim by any other driver finishing fifth on back in feature. (must be on same lap as fourth place car).

      D.    Driver making claim must drive his/her race car immediately after feature event, under its own power, directly to claiming area.

      E.    Claims must be made as soon as possible after the end of the feature race.

      F.     Claims must be made to the tech inspector in the claiming area and claiming driver must have exact claim fee and be a registered driver at Texas Thunder Speedway.

      G.    First sell, no sell, or swap by driver being claimed is binding. Driver will have 5 minutes to make a decision.

      H.    Only a driver may claim an engine and only the driver may agree to sell, swap, or refuse to sell engine. Only the drivers are allowed in the claiming area. Upon presentation of the claim, the claimed driver may:

              1.   Refuse to sell or swap engine. (see rule I. Below)

              2.   Accept the claim fee and sell engine.

              3.   Request to claim claimants engine/(swap): when this occurs, both drivers simply swap engines. No money changes hands. The driver making the initial claim must pay the wrecker ($50.00) for both engines.

I.      First refusal to sell/swap results in forfeiture of all cash and contingency winning for the feature, and trophies earned in the feature, plus all points earned for the season. Any driver/owner refusing to sell or swap under a legal claim also loses the right to claim an engine for 12 calendar months. (regardless of reinstatement) The first refusal to sell will also result in a 14 calendar day suspension from the date of refusal and until a $300 fine is paid to the track. The second refusal to sell will result in a 30 day suspension and a fine of $500, plus all cash and contingency earned as well as all points earned for the year, and losing right to claim an engine for 12 calendar months.

J.   All claimed engines must be removed from the car at the track.

K.  Any sabotage or attempted sabotage will result in the saboteur being suspended from competition for 21 calendar days or until a $500 fine is paid to the track.

L.  No driver may claim any other driver/car more than once during a regular season event.    

M. No driver may claim more than four engines in one regular racing season.

N.  After the engine is claimed the engine will not be restarted. The car must be pushed onto the claim pad.

Any questionable areas, IMCA rules apply.


1.   Point calculations for all classes will be calculated using the current IMCA point system, except twisters.

2.   Except in rare instances, decisions of track officials are final and binding without exception. In rare cases track officials may intervene. 

3.   These rules are not all inclusive. Track officials will interpret any questionable areas.

4.   The driver shall be the sole spokesman for his car owner and pit crew in any and all matters pertaining to the race. The driver only shall take part in any arbitration with the track officials.

5.   Special events may be governed by different rules and rule changes.

6.   Promoter will have the final say on all discrepancies.



1.   All cars, owners and drivers must be properly registered and all fees paid before they will be allowed to participate in any race event. This includes cars that primarily race at another facility.

2.   Registration fee for all classes will be $35. IMCA classes will also have to register with IMCA. 

3.   Each car registered will be assigned a number. Only one car will be registered with the same number in the same class. Owners/drivers that raced the previous season will have the option of retaining their current number until the first of the registration season.

4.   The number “1” is reserved for the previous season’s point champion in each class. All other numbers will be a maximum of two digits in length (2-99). Visiting drivers/cars will be exempted from this rule and will be assigned a number. 

5.   Once a number is registered, it will remain with the owner/ driver who registered the car for the entire season. If the car is sold the new driver/owner must re-register the car and be assigned a different number. Drivers are responsible for making their numbers legible. (see general track rules)

6.   In the event a car is totaled and the registered owner/driver gets a replacement, the owner/driver will retain his/her original number and all points.

7.   Numbers: All cars will be neatly painted and numbered. Numbering must be of contrasting color. Doors will be minimum 3” wide and 21” high. Top number will be min. 3” wide and 31” high. Extra numbers/letters must be 9” minimum and cannot overlap other letters/numbers. No obscene remarks, slogans, or pictures will be allowed on any cars.

Notes: Rules on safety and construction of different racecars are covered in the perspective class rules.



1. General: All general rules apply. All components are subject to inspection and approval by inspecting officials.

2. Safety equipment: SFI approved 5point safety belts, minimum 3” lap and 3” shoulder. Shoulder harness must be mounted at or below the shoulder level. Crotch strap mandatory SFI approved. Fire resistant fire suit required; helmets are required and must be snell rated sa2000 or better. Neck brace and racing seat required. The racing seat must be secured to roll cage. Driver’s equipment must accompany car at time of inspection and worn at all times the car is on the track except during packing. Technical approved door window net, dial type fire extinguisher, and front window screen in front of driver is required. Rollbar padding is required in driver compartment. SFI approved racing gloves /shoes required.

3. Number:  (See General Track Rules; Registration pg 13)

4. Body: Any U.S. manufactured full body passenger car or truck body, 1960 or newer, minimum 107.5” wheelbase, full frame or unibody. Must have original roof or complete aftermarket body. The max hole in hood will be 14” for air cleaner. Front fender wells may be removed. The fuel cell, if lower than frame rail, need to have a rear protection loop. The trunk lid, roof and hood may be gutted. All bumpers must be mounted in the original location, all chrome and glass must be removed from the body. All holes and firewall must be patched with like type material. Spoiler is 4” max and no wider than the trunk. . Complete aftermarket body may be used with a 3200 lb minimum. Stock body is 3000 lb minimum. All oem body cars will have full floorboards-frame rail to frame rail or will be designated aftermarket body weight limit.  I-stock body rules are legal.

5. Frame: All unibody cars must have original wheelbase with 107.5” min with no more than 1” difference from side to side. (may tie rear frame to front frame; tubing allowed) full frame cars must remain original wheelbase with 107.5 minimum.

6. Roll cage:

           A.   A roll cage consisting of continuous hoops not less than 1.66 inch outside diameter and having a wall thickness of at least .095, low carbon mild steel tubing required. Halo must have one crossbar. A full four point roll cage with a minimum of three driver side door bars and two passenger side door bars required. Door bars must be welded to the front and rear of the roll cage members. No brazing or soldering allowed. Full front and rear hoops are recommended. Additionally, each cage must have a dash bar and a minimum of two down rights not lower than 12” from the top of the roll cage corners extending down and back to the frame for additional support. All 90 degree angles must have gussets.     

    B.   Drivers head must not protrude above the cage with the helmet on and driver strapped in the driver seat.

    C.   No brace bars forward of the cage may be higher than stock hood height. May have bars in front of radiator within the confines of the body.

6. Engine:  All engines used in competition must be able to be used in production U.S. passenger cars without alteration. Optional solid motor mounts may be used in stock location. Casting and fittings must not be changed. No machine work on outside engine or on the front or rear of camshaft. Flat tappet cam/lifters and stud-mounted rocker arms only (note… no stud girdles) no limit on engine c.i. but must run gm with gm, ford with ford, etc. After market intakes are ok, max riser including adapter plate 6 inches. Headers optional, IMCA mufflers required. No 180’s stock. OEM mechanical fuel pumps only. No electric fuel pumps. All cars must have operational starter. Engine coolers optional (cannot be located in drivers compartment) engine location; #1 spark plug no further back than the center of ball joint. 

7. Carburetors: All cars must run a Holley two-barrel maximum 500 cfm or stock OEM four-barrel carburetor, no Holley four-barrel carburetor. Adapter plate may be used 1” maximum.

8. Cooling system:   One radiator in stock location. No second radiators. Reduction pulleys, electric fan optional. No electric water pumps.

9. Transmission:  Only OEM transmission will be allowed. Steel flywheels only. No coupler. Automatic transmission must have operable torque converter, scatter shield required. Standard transmission must have a single OEM type clutch within bell housing. Clutch type transmission will have an explosion proof bell housing. May construct a shield of at least ¼” thickness by 6” wide steel. That covers the clutch area by 180 degrees. It must be securely fastened.  One transmission cooler is ok in engine or trunk compartment only. If in trunk, the lines must be steel and run in conduit. 

10. Suspension / steering components: Quick steering optional, quick release steering wheel optional. No tilt steering. Any OEM car or truck rear end and floaters allowed, but no quick change devices. Rear suspension must match frame with stock components only, i.e. no pan hard bars. Front suspension & steering must be OEM in stock location. Bottom a-frames cannot be altered or moved. Imca stock car suspension is legal.

11. Fuel cell: Racing fuel cell required, and must be completely enclosed in full metal container. All fuel cells must be secured with two steel straps 2” wide attached to the frame or roll cage. Complete firewall must be between driver and fuel cell. Must be steel. Fuel lines inside car must be steel or run in conduit. Gas only. No alcohol. Rollover valve required. (See General Track Rules On Page 5)

12. Drive shaft: Must be painted white. Must have hoop around half of drive shaft 6-12“ from front yoke.

13. Shocks: One per wheel; no air shocks or adjustable coil overs.

14. Brakes: Drum/disk combination. 4-wheel brakes required. Brake bias allowed.

15. Tires & wheels:  All wheels must be steel with an 8” maximum width. Dot tires only with maximum of 9” tread surface. No grooving, no mud grip, IMCA stamped tires allowed. Bead locks optional on the right rear only.

16. Ballast: Weights must be securely mounted outside driver’s compartment with 2 ea, ½” bolts minimum to frame or roll cage, must be painted white and have the car number on it 

17. Battery: Battery must be securely attached to frame or roll cage with metal straps and must be enclosed in boat type battery box with cover.

18. Engine claim/swap: See General Track Rules.

19. Tow hooks or chains are required on front & rear of car.


These are not race cars, they are cars that race!


1.   General: All general rules apply. All components are subject to inspection and approval by inspecting officials.

2.   Safety equipment: SFI approved 5point safety belts, minimum 3” lap and 3” shoulder. Shoulder harness must be mounted at or below the shoulder level. Crotch strap mandatory SFI approved. Fire resistant fire suit required; helmets are required and must be (SHCA)85 Snell or bell approved or better. Neck brace is required. Racing seat is recommended. The racing seat must be secured to roll cage. Driver’s equipment must accompany car at time of inspection and worn at all times the car is on the track except during packing. Technical approved door window net, dial type fire extinguisher, and a front window screen in front of driver is required. Rollbar padding is required in driver compartment. SFI approved racing gloves/ shoes required.

3.   Number:  (See General Track Rules; Registration pg 13)

4.   Body: Any sub-compact mid-size car, front wheel drive, that came OEM with four-cylinder or six-cylinder. Absolutely no gutting cutting allowed on body. All glass molding and plastic must be removed from exterior. Doors must be secured (i.e. chained minimum 5/16” welded, etc. Recommend welding door seams). Stock ignition must be in place and operational.

5.   Roll cage:  Four point roll cage installed with no gutting and at least one rear kicker (6 point recommended). No bars may extend past the passenger area. Windshield screen must be used with at least 3 ¼” bars protecting the driver/ passenger.

6.   Door bars:   Minimum three horizontal door bars on driver side and two horizontal door bars on passenger side. Both sides must have vertical bracing from top to bottom door bars. All tubing must be minimum 1.5” o.d. with 0.095“wall thickness. Steel door plates, 18 gauge or 0.049” minimum thickness, must be securely welded to outside of doorbars on driver side, plate must cover area from top door bar to frame and from rear down post to 5”  in front of seat. Must be visible for inspection.

7.   Transmission: OEM only.

8.   Suspension/ steering: OEM only

9.   Fuel cell: Fuel cell recommended. Stock fuel tanks allowed. Stock ignition must be in place and operational with OEM stock in-tank fuel pumps. 

10. Brakes: All four brakes must be operational, no bias, OEM only. 

11. Tires & wheels:  Manufacturers recommended only for that make and model…. No racing tires. 

12. Ballast: No added weight allowed.

13. Battery/electronics:  Must be securely mounted and placed in a plastic boat battery box and securely mounted with metal straps. No aftermarket electronics, and/or sensors, OEM only.

14. Claim:  Car cannot be claimed on drivers first race night. No claim will be allowed if 10 or less cars participate in the night’s events. Top four finishers are subject to claim for $500(cash only). Claims are made at the front gate and must be made between 8:00-8:30pm. Claim includes the entire car except driver’s personal safety equipment. Any car in competition is subject to promoters claim at $500.

15. Claim refusal: 

      1.  First offense: $500 fine, cash only and must be paid at the front ticket booth before competing again in the twister class, and loss of all points for the season.

2. Second offense: barred from racing twister and any other class until a $500 fine (cash only) is paid. 

3. Claimer refusal will result in a $100 fine.

Amendments to these rules may be made at any time if certain types of cars are dominating.




1. General: All general rules apply. All components are subject to inspection and approval by inspecting officials.

2.   Safety equipment: Rules apply at all times car is on track. Snell-rated sa2000, sa2005, or sa2010 helmet required. Roll bar padding required in driver compartment (fire retardant recommended). SFI-approved full fire suit required. Fire retardant gloves, shoes and neck brace (or head and neck restraint) required. Right and left seat head supports required if using head restraint system with no neck collar. Recommended: fire retardant head sock and underwear; collapsible steering shaft. Driver-side window net required, minimum 16 inch by 20 inch ribbon or mesh style, and must be mounted to roll cage so latch is at top front of window. Minimum three inch (two-inch with head restraint system) wide SFI-approved five point safety belt assembly required (y-type shoulder harness not allowed), must be mounted securely to roll cage, recommended to be no more than two years old. Kill switch required within easy reach of driver and must be clearly marked ‘off’ and ‘on’.


3. Number:  (See General Track Rules; Registration pg 13) 

4.     Body/chassis: Any front wheel drive, compact car with three, four or six cylinder engine. Must be unaltered OEM-appearing body. No station wagons, convertibles or two seat sports cars allowed. Maximum wheelbase 107 inches, maximum one inch difference from side to side. OEM steel unaltered floor pan only. Inner fenders may not be removed. Hood and trunk lid/hatch must be securely fastened. All doors must be securely welded or bolted. All glass, exterior lights, chrome/plastic trim and hood insulation must be removed. Dash may be removed, but can remain. Maximum seven inch front and rear sun visors allowed, opera window may be closed. Skirting allowed, must maintain OEM appearance.


5. Bumpers/rub rails: Bumpers must be welded, chained or cabled to frame. Front and rear tow hooks mandatory. Oem bumper covers recommended. May have one horizontal bar - maximum 1.75 inch od - tying front frame horns together ahead of radiator. One additional maximum one inch od bar may be added for radiator protection; must be behind bumper, within confines of body, no wider than OEM frame horns. Maximum one inch wide by two inch tall steel or lexan rub rails allowed bolted flush to body. No sharp edges allowed on bumpers, rub rails or bolts. No bars past outside edge of body other than rub rails.tubing bumpers allowed using 1.5” od maximum. 

6.     Roll cage: Six-point, full perimeter roll cage required. Must use minimum 1.5 inch o.d. with 0.095 inch wall thickness tubing. Rear hoop must have “x” bracing configuration. Rear kickers required. Front brace bar from main halo to front cowl is recommended. Forward brace bar allowed from main cage to front strut tower. Brace bar allowed between strut towers in front and rear. No other bracing allowed on front end. Must have 1.25 inch minimum o.d. cross bar in top halo. Cage must be electric welded and attached using adequate plating (minimum 0.250 inch recommended). No iron, galvanized pipe or fittings, square tubing, brazing or soldering allowed.


7.     Door bars: Minimum three horizontal door bars on driver side and two horizontal door bars on passenger side. Both sides must have vertical bracing from top to bottom door bars. All tubing must be minimum 1.5 inch o.d. with 0.095 inch wall thickness. Steel door plates, 18 gauge or 0.049 inch minimum thickness, must be securely welded to outside of door bars on driver side. Plate must cover area from top door bar to frame and from rear down post to five inches in front of seat. Must be visible for inspection.


8. Driver compartment: Minimum 3 windshield bars and protective screen mounted in front of driver. Aluminum high-back racing seat required. Must be securely mounted to roll cage using 0.375 inch bolts. Driver must be sealed off from track, engine, transmission and fuel cell/tank. No mirrors. No gutting allowed except for roll/door bar clearance. All flammable material, radio and air bags must be removed. Front and rear firewalls must remain and have no holes. Interior must remain open.


9.     Suspension and steering: Rear wheels must track straight ahead and be in alignment with front wheels. No more than 5 degrees camber on any wheel. No center steering. Quick release steering wheel is allowed, must maintain OEM column.


10. Springs/shocks/struts: Shock and springs may be modified. Spring rubbers allowed.

11. Tires and wheels: Racing tires are allowed. Grinding, sanding, siping & grooving allowed. Must be oem steel or aluminum wheels, with standard bead bump and maximum eight inch width. Tires recommended to be inside of body. No bleeder valves. Reinforcing of wheels recommended. One inch o.d. steel lug nuts on steel wheels recommended.


12. Brakes: Must be steel, four wheel disc or drum brakes, and match year, make and model of car used. OEM master cylinder only, in OEM location. No brake shut off. Steel brake lines only.


13.      Exhaust:  Mufflers are required!


14. Battery/starter: One 12 volt battery only. Must be securely mounted with positive terminal covered. Battery must be in marine type case if mounted in driver compartment. OEM starter only, must be in OEM location. Car must leave initial staging area on demand, unaided, or go to rear of that race.


15.      Gauges/electronics: No unapproved cameras, transmitting or listening devices (exception is one-way raceceiver radio by officials). 12 volt ignition system only. Aftermarket analog tach, oil pressure and water temp gauges only. Vehicle computer (ecu) should be mounted in accessible location for inspection.


16. Fuel system: Must have complete, unaltered, OEM fuel system for year, make and model of car used. Gasoline only.Gas tank ahead of rear axle allowed but must install shield under it. Gas tank behind rear axle must be replaced with maximum eight gallon fuel cell and relocated to trunk area. Must mount with minimum two solid steel straps around entire cell two inches wide and 0.125 inches thick. Metal firewall or cell cover must be between driver and cell. Fuel cell vent, including cap vent, must have check valve. If racing fuel cell does not have aircraft style positive seal filler neck/cap system - a flapper, spring or ball type filler rollover valve is required. External electric fuel pump wired to the ignition switch allowed with aftermarket fuel cell. No cool cans. Fuel lines through driver compartment must be steel. Aftermarket fresh air pipe and air filter allowed, but no ram air.


17. Transmission: All forward and reverse gears must be operational. Flywheel, flexplate, clutch assembly and torque converter must be unaltered. No transmission coolers in driver compartment. No torque dividing final drive. No locked differentials.


18. Engine compartment: Engine and radiator must be in OEM location for year, make and model of car used. May use solid engine mounts or safety chains. No accumulators /accusumps.


19. Engine: 3, 4, or 6 cylinder engines only. Double overhead cam recommended.


20. Vehicle identification number: V.I.N. must remain clearly visible & unaltered in at least one of the OEM locations. Any car missing the V.I.N. will not be allowed to compete.


21. Claim: Must be a registered outlaw twister driver to claim car & must finish on lead lap. Car cannot be claimed on drivers first race night. No claim will be allowed if 10 or less cars participate in the night’s events. Top four finishers are subject to claim for $1500 cash only. (or 1000.00 for swap) claims are made at the claim barrel and must be made within 5 minutes of checkered flag. Claim does not include – racing seat, safety belts, fuel cell and electric fuel pump (if equipped), or transponder. 

22. Claim refusal: See Texas Twister rules (page 18, #15)


These rules are all inclusive. So if it does not say you can, you can’t. Promoter will have the final say on all discrepancies. Ask prior to modifying, building or guessing. 

Amendments to any rules may be made at any time if certain types of cars are dominating.


*Must purchase Pit Pass/Band.

*Reinforcements are allowed.

*Body mounts can be changed.

*All glass and moldings must be removed. All doors must be chained or welded shut. Any door that opens, could be grounds for disqualification. 

*Safety belts, helmet and neck braces are required.

*Can move battery, but must be covered and secured with metal straps or bolted to the floor. 

*Fenders may be trimmed and motors chained.

* May remove fan.

*Radiators must remain in stock position.

*Driver’s seat can be braced.

* Cars without electric fuel pumps in fuel tank, must have fuel cell (boat tank) secured in the trunk area. 

*No trailer hitches or frame braces. 

*No cutting frames.

*No trucks.

*No tires larger than 15".  Summer time passenger car tires filled with air only.  No solid/mud/implement type tires.

*Rear End may be locked.

*Fire Extinguishers required. 

*All cars will be teched.

*Must hit a moving car every two minutes

*These are the rules; if it doesn’t say you can do it, then you can’t. 

*All vehicles must be removed from the track unless an Owner Title is left with the car.

*Registration Fee will be WAIVED provided you give us the Owner's Title or Bill of Sale and leave the car at the track after the Derby.

*Any registered race car from Texas Thunder may enter the derby and if they win they will be paid an extra $100.00! 


*IMCA Modified

*IMCA Sport Mod

*IMCA Stock Car

*IMCA Hobby Stock

(Available At www.IMCA.com)


All IMCA rules apply for IMCA classes.

All general track rules apply to all classes.