2025 PINE RIVER DEMO DERBY RULES

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COMPACT CARS

• Front-Wheel Drive Cars: Allowed with a 113-inch wheelbase max and V6 or less factory.

• Rear-Wheel Drive Cars: Allowed with a 108-inch wheelbase max.

Bumpers:

• Any factory-loaded bumper or homemade bumper (8-inch max spread over 32 inches, no sharp points).

• 18 inches max to the bottom of the bumper.

• You can hard-nose the bumper and shorten the frame to the core support.

• Mounting options: 6-inch plate, bolt, or chain (plate must start at the bumper).

• Allowed to weld frame and subframe together with the bumper bracket.

Frame Plates or Repair:

• Allowed 2 4”x4” fix-it plates per frame rail (4 total per car).

• Hood bolt all-thread plate must not exceed ½ inch past the threaded rod.

• Rust repair: Allowed 2 inches past rust with 1/8-inch max plate steel (thicker plates count as fix-it plates).

• Allowed to connect frame and subframe in one extra spot besides the bumper bracket.

Doors, Trunks, and Hoods:

• Doors: Can be mounted shut by welding, chains, or bolts.

  • If welded: 20 inches of plate per seam max (chains/wire not allowed).

  • If chained/wired: 6 chains/wires per door max (only one may wrap around the frame).

• Hoods:

  • Must have a 12-inch inspection hole.

  • Can be chained or bolted in a maximum of 6 spots.

  • All-thread through the core support down to the subframe is allowed.

• Trunks:

  • Can be bolted with 2 all-thread.

  • Can be bolted, chained, or welded (20 inches of plate per seam max if welded).

  • Chain: 4 spots max on the trunk lid.

Fenders:

• Allowed to bolt through fender with 4 bolts total per fender (3/8-inch max bolts, 2”x2”x1/8” washers max).

• Body shaping is allowed.

Subframes:

• Pucks may be removed.

• No stuffing of subframes.

• No welding anywhere unless specified in the rules.

• Subframes can be bolted back through the floor with factory-sized bolts.

• The front can be bolted all the way through the core support.

Body:

• Rust repair allowed with factory thickness plate steel (2 inches past rust max).

• No plating of the firewall.

Cage:

• 4-point cage required.

• Halo bar allowed, welded to the cage only.

• 4 down bars allowed (must go only to floor tin).

• Gas tank protector allowed but must not touch sheet metal.

• Cage max length: 66 inches from the frontmost part of the cage back.

• Battery box and transmission cooler may be bolted to the cage or floor, but not both.

Engine (Factory V6 or Less):

• Allowed: Headers.

• Not Allowed: Cradles, header protectors, carb protectors.

• Square tubing may replace factory mounts but must not reinforce the car.

Radiator:

• May have a ¼-inch max plate steel in front of the radiator, bolted to the core support (no welding).

Tires:

• No tire rule.

Front End:

• Allowed to run 2x4x4 tubing behind the strut tower to prevent bending (welded to frame only).

• Strut spacers allowed to achieve bumper height.

• Factory struts and steering must be used.

Gas Tanks:

• Factory gas tanks must be removed.

• Replacement tanks must be mounted inside the car.

• No plastic gas tanks.

• Gas tank protectors required.

Batteries:

• Must be removed from factory location and mounted inside the car.

• Secure mounting required.

• Bolted-down battery box is strongly recommended.

Aftermarket Parts:

• Allowed: Tuned ECMs, shifters, headers, carb swaps, transmission coolers.

 

General Rule:

If it doesn’t say it in the rules, don’t do it!

(Additional sections for Full-Size Cars and Compact Trucks/SUVs/Vans follow similar formatting.)