Texas Thunder Speedway Rules
Promoter, Pat Wilson 254-290-6262

Note:  Age Limit is 13-19 Years

1.  1970 OR NEWER COMPLETE STOCK COMPACT TYPE BODIES AND FRAMES, HARDTOPS , NO CONVERTIBLES.  FRONT BUMPERS MAY BE STOCK; ANY ADDITIONS TO STOCK BUMPERS OR HOMEMADE BUMPERS MUST NOT EXTEND BEYOND STOCK BUMPER MOUNTING POINTS. .095 MAXIMUM WALL THICKNESS FOR HOMEMADE BUMPERS/ADDITIONS AND/ARE BE CONTINUOUS HOOPS. NO SQUARED OFF EDGES. THE CROSS BARS CAN ONLY EXTEND FROM ONE FRAME RAIL TO ANOTHER TO PROTECT THE RADIATOR.

2. WHEELBASE: ANY UNALTERED COMPACT WHEELBASE WITH 1” MAXIMUM BETWEEN SIDE-TO-SIDE.

3.  BODY:  MUST APPEAR STOCK FROM FACTORY.    FRONT FIRE  WALL WITH FLOOR PAN MUST IN STOCK 

LOCATION.  THE ONLY ALTERATIONS ARE:

A. YOU MUST REMOVE THE FOLLOWING:

    1. INTERIORS, REAR SEATS AND OTHER FLAMMABLE OR COMBUSTIBLE MATERIALS.

    2. ALL GLASS, LIGHTS AND ALL PLASTIC PARTS SUCH AS GRILLS, TAILLIGHTS, HOUSINGS AND SIDEMARKERS.

    3. WINDOW CRANKS AND HARDWARE, DOOR HANDLES, MIRRORS, CHROME STRIPS AND ORNAMENTS.

B.  YOU MAY RADIUS THE FENDERS FOR TIRE CLEARANCE AND REMOVE FRONT WHEEL INNER FENDERS SKIRTS AND CUT DOOR PANELS OUT.  YOU MAY GUT HOOD, TRUNK, AND TOP.    YOU MAY FULLY ENCLOSE INSIDE OF CAR OR CONSTRUCT DRIVERS TUB. NO SHARP EDGES.

C. YOU MAY ADD:

    1. COVER HOLES FOR DOOR HANDLES, SIDE -MARKERS, AND RUST HOLES WITH SHEET METAL.

    2. DOOR  PROTECTION OR “ RUB RAIL” ONLY AS FOLLOWS: ONE PER SIDE, SQUARE OR ROUND TUBING FASTENED TIGHTLY AGAINST BODY OF CAR   MAXIMUM WHEEL WELL TO WHEEL WELL.  ENDS MUST BE TURNED IN OR CAPPED WITH NO SHARP EDGES. MUST BE PAINTED SAME AS THE DOOR.

    3. 4” MAXIMUM SPOILER.

D. YOU MUST RETAIN THE FULL FACTORY FLOOR PAN AND FIREWALL MOUNTED ON FACTORY MOUNTS.

4. ENGINE:

A. LOCATION IN STOCK POSITION.

B. 4 CYLINDER IN- LINE ONLY AND MUST MATCH MAKE OF CAR.

C. 155 CU. IN. MAXIMUM (2540 CC).

D. STOCK INTAKE MANIFOLD, MAXIMUM 1” RISER PLATES OK, INCLUDING ANY ADAPTER.

E. HEADERS OK; MUST DIRECT SPENT GASES AWAY FROM DRIVERS COMPARTMENT.

F. SOLID MOTOR MOUNTS OK.

5. CARBURETOR:   ONE 2-BARREL CARBURETOR ONLY (MAX. 500 CFM).

6. TRANSMISSION:   OEM ONLY.  STOCK TO MAKE OF CAR: TOP LOADS ONLY.  AUTOMATICS MUST HAVE TORQUE 

CONVERTER.

7. REAR END:    STOCK TYPE ONLY FOR MAKE OF CAR. LOCKED REAR END OK. 4-LUG ONLY.

8. STEERING: QUICK RELEASE STEERING WHEEL AND STEERING QUICKENER OPTIONAL.

9. SUSPENSION:   MUST REMAIN STOCK . SPRING SPACER ALLOWED.

10. SHOCK ABSORBERS:   ONLY ONE PER WHEEL.

11. WHEELS: STEEL WHEELS. NO ALUMINUM WHEELS. MUD PLUGS OPTIONAL.

12. TIRES:    TIRES MUST BE MAXIMUM TREAD TIRE WIDTH (MEASURED OUTSIDE GROOVE TO OUTSIDE GROOVE) 9”.   

DOT TIRES ONLY.

13. FUEL LINE:  NEOPRENE (SYNTHETIC RUBBER) AND / OR METAL TUBING FROM FUEL TANK TO CARBURETOR.  IF

NEOPRENE LINE RUNS THROUGH DRIVERS COMPARTMENT IT MUST BE ENCLOSED IN CONDUIT.  STEEL BRAID LINE IS OK. 

14. RACING FUEL CELL REQUIRED: FUEL CELL MUST BE COMPLETELY ENCLOSED IN FULL METAL CONTAINER. ALL FUEL 

CELLS MUST BE SECURED WITH TWO STEEL STRAPS 2” WIDE.  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.  

CHECK VALVE REQUIRED.  SEE TRACK GENERAL RULES ON PAGE 3.

15. HOOD & TRUNK:  MUST BE SECURED.  NO BOLT DOWN HOODS.  REAR OF HOOD SHOULD FIT DOWN SNUGLY.  HOLE FOR AIRCLEANER ALLOWED (MAXIMUM 14”).

16. ROLL CAGE: MINIMUM 4 POINT ROLL CAGE WITH 1 1/2”, MAXIMUM 2”, NO SCHEDULE 40 PIPE, MINIMUM .095 WALL THICKNESS. MUST HAVE ONE CROSSBAR ON TOP HALO.  THREE DOOR BARS ON DRIVER’S SIDE AND TWO DOOR BARS ON PASSENGER SIDE.  FRONT LOOP AND REAR FRAME REINFORCEMENT RECOMMENDED.  ALL 90 DEGREE ANGLES MUST HAVE GUSSETS.  CAGE MUST BE WELDED OR BOLTED TO SUBFRAME.  NO GALVANIZED PIPE.

17. SEATS:   RACING SEAT ONLY.  SECURED TO ROLLCAGE BOTTOM AND BACK.

18. SEAT BELTS:  FIVE POINT 3” RACING SAFETY HARNESS WILL BE REQUIRED.

19. WINDOW NETS:  WINDOW NETS REQUIRED.  MUST BE TECHNICALLY APPROVED.

20. HELMET:  DRIVERS MUST WEAR AN 85 SNELL OR HIGHER OR SFI APPROVED HELMET. HELMET MUST ACCOMPANY CAR AT TIME OF TECHNICAL INSPECTION.

21.     DRIVERS SAFETY EQUIPMENT:  SFI APPROVED FIRE SUITS; NECK BRACES AND GLOVES MANDATORY AND SFI RACING SHOES RECOMMENDED.

22.     FIRE EXTINGUISHER:  A 2 1/2 LB. TYPE “B” OR “C” DRY CHEMICAL EXTINGUISHER, FULLY CHARGED.  MUST HAVE A DIAL TYPE GAUGE.  MUST BE SECURELY MOUNTED WITHIN DRIVER’S REACH.  THE DRIVER MUST BE ABLE TO REMOVE FOR FIRE EMERGENCY.  (I.E.  NO TAPE, ZIP TIES OR STEEL BANDS USED TO SECURE MOUNTING) EQUIVALENT HALOGEN FIRE EXTINGUISHERS ACCEPTABLE.

23. EXTRA WEIGHT:  WEIGHTS MUST BE SECURELY MOUNTED TO FRAME OR ROLL CAGE, AND MUST BE PAINTED WHITE AND HAVE THE CAR NUMBER ON IT.

24. DRIVE SHAFT:  MUST BE PAINTED WHITE.  DRIVE SHAFT LOOP WILL BE 6-12 INCHES IN BACK OF FRONT U-JOINT AND WILL BE TECHNICALLY APPROVED.

25. BATTERY:   LOCATED BETWEEN FRAME RAILS FORWARD OF REAR END AXLE TUBES.  MUST BE COMPLETELY ENCASED.  BATTERY MUST BE SECURELY MOUNTED TO FRAME OR ROLLCAGE.

26. KILL SWITCH OR ON/OFF SWITCH:  LOCATED WITHIN EASY REACH FROM OUTSIDE OF CAR THROUGH WINDOW.  ON/OFF MARKINGS SHOULD BE HIGHLY VISIBLE.

27. SHARP POINTS/EDGES: ALL SHARP POINTS/EDGES INSIDE AND OUTSIDE THE CAR SHOULD BE REMOVED.  ANY NEW SHARP POINTS/EDGES CREATED BY AN ACCIDENT SHOULD BE REMOVED BEFORE THE NEXT RACE NIGHT. SUBJECT TO TECHNICAL APPROVAL.

28. BRAKES: MIN 3 BRAKES MUST OPERATE AND BE ORIGINAL FACTORY EQUIPMENT.

29. WINDSHIELD BARS AND SCREEN:  A MINIMUM OF FOUR BARS 1/4’ IN DIAMETER SECURELY MOUNTED 4”-6” ON CENTER IN FRONT OF DRIVER REQUIRED.  HIGHLY RECOMMENDED: BARS ACROSS ENTIRE FRONT WINDSHIELD AREA WITH A HEAVY WIRE SCREEN ATTACHED.

30. FAN SHROUD:  FAN SHROUD REQUIRED.  METAL RECOMMENDED.

31. RADIATOR:   LOCATED IN STOCK POSITION AHEAD OF ENGINE.  NO DUAL RADIATORS ALLOWED. RADIATOR SCREEN MUST REMAIN BEHIND THE BUMPER. PROTECTION BARS IN FRONT OF RADIATOR IS ALLOWED BUT MAY NOT PROTECT BEYOND THE BODYLINES AND MUST BE BEHIND THE FRONT BUMPER.

32. SCATTERSHIELD:  1/4” THICK STEEL PLATE, 6” WIDE COVERING 180 DEGREE OVER STOCK BELL HOUSING.

33. DOORS: MUST BE PERMANENTLY AND SECURELY FASTENED SHUT.

34. FRONT FIREWALL:  REQUIRED. HOLES MUST BE SEAL WITH METAL PATCHES. THERE MUST BE A FIREWALL BETWEEN DRIVER AND FUEL TANK. FUEL TANK MUST BE FULLY ENCLOSED.

35. MIRRORS:  NO MIRRORS OR REFLECTIVE DEVICES ARE ALLOWED.

36. NUMBERS:  ALL CARS MUST HAVE A MINIMUM OF ONE 18” NUMBER ON EACH SIDE AND ONE 18” NUMBER ON THE ROOF READABLE FROM THE GRANDSTANDS AND TOWER SIDE OF TRACK (PASSENGER SIDE). A 4” x  4” PLATE WITH NUMBER WILL BE PLACED IN THE TOP RIGHT FRONT WINDOW AND IN THE TOP LEFT REAR WINDOW WITH CAR NUMBER ON IT. NUMBERS AND LETTERS SHOULD BE IN CONTRASTING COLORS FROM CAR BODY.

37. LETTERING: NO PROFANE, OBSCENE OR SEXUAL SIGNS OR WORDS MAY BE DISPLAYED OR PAINTED ON YOUR CAR. LOOK AND ACT PROFESSIONAL.

38. SUN ROOFS:  SUN ROOFS OPENINGS MUST BE COVERED WITH SHEET METAL.

39. ENGINE CLAIM / SWAP:   SEE GENERAL RULES.