4” NASCAR, GTP, LMP & DTM chassis rules:
- Any 4 inch commercially made chassis, NO homemade.
Acceptable modifications below:
- May interchange parts from a single manufacturer; such as Flexi and Flexi-2 parts, JK long or short center sections, and heavy or light pans on JK chassis.
- May solder or glue motor, axle bushings, front wheel retainers, etc.
- May add lead weight ONLY and tape to chassis.
- May file holes in motor bracket to allow better gear mesh, but must retain a portion of motor bracket.
- May file bushings or upright holes vertically to offset bushings or use offset bushings.
- May add spacers between pan and center section.
- May add motor mount(s), rear upright brace(s) and gear protector, brace must not stiffen chassis front to back.
- The original manufactures plating may be removed in the area to be soldered only.
- May add pin tubes. Pin tubes may be either solid or floating. May add lead wire retainer.
- May solder on steel guide tongue reinforcement such as Slick 7 but the original tongue may not be removed, modified, or moved.
- NO other modifications, cutting, grinding, or bracing are allowed.
- ONE guide per car. May use any guide nut, spacers, lead wire and clips.
- Maximum width, with body is 83mm.
- Minimum track clearance, .047" including gear, measured under rear axle before the race.
- Race director may check for dragging chassis at any time and/or minimum .039" before any heat. Any repairs will be performed during green flag conditions.
- Rear axle must be solid, steel, one piece, mi 3/32" dia.
- Rear tires must be black rubber, maximum .810" width and maximum .615 hub.
- NO soldering pan tube or pans together.
- May tape chassis.
- ALL classes to run 3/32 solid axle with 64 pitch gears.
Body rules:
4" NASCAR body rules:
- Front bumper minimum- 1/16".
- Rear bumper minimum- 1/8".
- No spoiler height.
- Fully painted body with 3 numbers.
- Clear windows.
- Paper or plastic interior. Must COMPLETELY hide chassis when viewed from above.
- May reinforce body with tape or lexan.
- NO add-on air control.
- NO alterations or additions to the manufactures dimensions.
- Any cut-outs or openings must be the same as on the actual car.
- Front wheels- must be seen through clear or cut out wheel wells. or realistic wheel stickers on the outside.
DTM body rules:
- Front bumper- vertical plane
- Rear bumper- follow body line that is there
- Everything else is the same as 4" NASCAR
GTP & LMP body rules:
- Front bumper- vertical plane
- Everything else is the same as 4" NASCAR, except there's no rear bumper or spoiler.
- Do not need interior.
Motor rules:
4” NASCAR-
- Unaltered Pro-Slot 4002FK or Scorpion, with 11 or 12 tooth pinion and open spur, 64 pitch ONLY.
LMP & DTM-
- Unaltered Pro-Slot 4002FK, Pro-Slot Speedball or Crazy Eagle, with 9, 10, 11 tooth pinion and open spur, 64 pitch ONLY.
- NO modifications except for-
- May change or alter brushes and/or springs.
- May solder can bearing.
- May apply fingernail polish to seal.
- May apply CA to magnets.
- Seal MUST be covering at least 2 can screws and unbroken.
- NO removing seal & sticking back on can.
- Tech director discretion if seal is acceptable.
GTP-
- Unaltered Pro-Slot Speedball, open pinion and spur, 64 pitch ONLY.
- Any 4 inch commercially made chassis, NO homemade.
Acceptable modifications below:
- May interchange parts from a single manufacturer; such as Flexi and Flexi-2 parts, JK long or short center sections, and heavy or light pans on JK chassis.
- May solder or glue motor, axle bushings, front wheel retainers, etc.
- May add lead weight ONLY and tape to chassis.
- May file holes in motor bracket to allow better gear mesh, but must retain a portion of motor bracket.
- May file bushings or upright holes vertically to offset bushings or use offset bushings.
- May add spacers between pan and center section.
- May add motor mount(s), rear upright brace(s) and gear protector, brace must not stiffen chassis front to back.
- The original manufactures plating may be removed in the area to be soldered only.
- May add pin tubes. Pin tubes may be either solid or floating. May add lead wire retainer.
- May solder on steel guide tongue reinforcement such as Slick 7 but the original tongue may not be removed, modified, or moved.
- NO other modifications, cutting, grinding, or bracing are allowed.
- ONE guide per car. May use any guide nut, spacers, lead wire and clips.
- Maximum width, with body is 83mm.
- Minimum track clearance, .047" including gear, measured under rear axle before the race.
- Race director may check for dragging chassis at any time and/or minimum .039" before any heat. Any repairs will be performed during green flag conditions.
- Rear axle must be solid, steel, one piece, mi 3/32" dia.
- Rear tires must be black rubber, maximum .810" width and maximum .615 hub.
- NO soldering pan tube or pans together.
- May tape chassis.
- ALL classes to run 3/32 solid axle with 64 pitch gears.
Body rules:
4" NASCAR body rules:
- Front bumper minimum- 1/16".
- Rear bumper minimum- 1/8".
- No spoiler height.
- Fully painted body with 3 numbers.
- Clear windows.
- Paper or plastic interior. Must COMPLETELY hide chassis when viewed from above.
- May reinforce body with tape or lexan.
- NO add-on air control.
- NO alterations or additions to the manufactures dimensions.
- Any cut-outs or openings must be the same as on the actual car.
- Front wheels- must be seen through clear or cut out wheel wells. or realistic wheel stickers on the outside.
DTM body rules:
- Front bumper- vertical plane
- Rear bumper- follow body line that is there
- Everything else is the same as 4" NASCAR
GTP & LMP body rules:
- Front bumper- vertical plane
- Everything else is the same as 4" NASCAR, except there's no rear bumper or spoiler.
- Do not need interior.
Motor rules:
4” NASCAR-
- Unaltered Pro-Slot 4002FK or Scorpion, with 11 or 12 tooth pinion and open spur, 64 pitch ONLY.
LMP & DTM-
- Unaltered Pro-Slot 4002FK, Pro-Slot Speedball or Crazy Eagle, with 9, 10, 11 tooth pinion and open spur, 64 pitch ONLY.
- NO modifications except for-
- May change or alter brushes and/or springs.
- May solder can bearing.
- May apply fingernail polish to seal.
- May apply CA to magnets.
- Seal MUST be covering at least 2 can screws and unbroken.
- NO removing seal & sticking back on can.
- Tech director discretion if seal is acceptable.
GTP-
- Unaltered Pro-Slot Speedball, open pinion and spur, 64 pitch ONLY.