2025 PINE RIVER DEMO DERBY RULES

​Compact Cars

Allowed vehicles

• Front wheel drive: max 113" wheelbase, V6 or less from factory.

• Rear wheel drive: max 108" wheelbase.

Bumpers

• Any factory loaded or homemade bumper allowed.

• 8" max spread over 32". No sharp points.

• 18" max height to the bottom of bumper.

• You may hardnose and shorten the frame to the core support.

• Bumper may be mounted using a 6" plate, bolt, or chain. Plate must start at bumper.

• You are allowed to weld frame and subframe together with bumper bracket.

Frame plates & repair

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

• If using a plate behind hood bolt all-thread, it must not exceed ½" past threaded rod or it counts as a fix-it plate.

• Rust repair: 2" past rust, ⅛" max plate steel. Thicker counts as a fix-it plate.

• You may connect frame and subframe in one extra spot besides the bumper bracket.

Doors, trunks & hoods

• Body shaping allowed.

Doors:

• May be welded, chained, or bolted shut.

• Weld: 20" plate max per seam.

• Chains/wire: 6 max per door, only one may wrap frame.

Hoods:

• Must have a 12" inspection hole.

• May be chained or bolted in 6 spots max.

• All-thread allowed through core support to subframe.

Trunks:

• May be bolted with 2 all-thread plus bolted/chained/welded.

• Weld: 20" plate max per seam.

• Chain: 4 max on trunk lid.

Fenders

• May be body-shaped.

• Max 4 bolts per fender (⅜" bolts).

• Washers max 2x2x⅛".

Subframes

• You may remove pucks.

• No stuffing of subframes.

• No welding unless specified.

• May bolt back through floor using factory-sized bolts.

• Front may be bolted through core support.

Body

• Rust repair allowed with factory-thickness steel, 2" past rust.

• No firewall plating.

Cage

• Must have a 4-point cage.

• Halo allowed, welded to cage only.

• 4 down bars max, welded to floor tin only.

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

• Cage max 66" from front-most point backward.

• Battery box and tranny cooler may be bolted to cage or floor—not both.

Engine (factory V6 or less)

• Headers allowed.

• No cradles, header protectors, or carb protectors.

• May use square tubing to replace factory mounts—not to reinforce car.

Radiator

• You may bolt a plate (¼" max) in front of radiator to core support. No welding.

Tires

• No tire rule.

Front end

• May weld 2x4x4 tubing behind strut tower (frame only) to protect from bending.

• Strut spacers allowed for bumper height.

• Must use factory struts and steering.

Gas tank

• Factory gas tanks must be removed.

• Replacement tank must be inside the car.

• No plastic tanks.

• Must have a protector.

Battery

• Must be removed from factory location and securely mounted inside.

• Battery box should be bolted down (strongly recommended).

Aftermarket parts

• Tuned ECMs, shifters, headers, carb swaps, transmission coolers allowed.

If it doesn't say it in the rules, don't do it! Pre-rans must meet all rules.

Let me know if you'd like the next sections done the same way.

4o

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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.)