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■Mini 4WD Official Race Regulations



【1】Machines

1. Usable Machine Types
  • Only Tamiya Mini F Series or Mini F Finished Models (Red, Blue, Yellow, White) are permitted.
  • Any Mini 4WD, R/C Mini 4WD and Dangun Racer body may be used.

2. Machine Assembly

  • All machines must be rear-wheel drive (front-wheel drive is prohibited).
  • Bodies should have stickers applied or be painted, and must be securely attached to the chassis.
  • Body shapes that cause physical harm to the track, cause injury to any person are prohibited.
  • All machines must go through car inspection and machines that do not pass inspectioin cannot participate in the race.

3. Machine Measuring System

All machines will be subject to the same measuring system as shown below.
  • Maximum Car Width: Under 105mm (including rollers)
  • Overall Car Height: Under 70mm (measured from a flat surface, including rear wing)
  • Overall Car Length: Under 180mm (including bumpers and other added parts)
  • Minimum Ground Clearance: At least 1mm (measured from a flat surface)
  • Minimum Car Weight (including batteries and motor): At least 90g
  • Front and Rear Tires: Diameter: 22-35mm, Width: 8-26mm (Note that tires must be attached.)
  • Rollers: Maximum of 6 installations total (stabilizer poles do not count at all)

4. Motor

  • Machines may use the kit-included FA-130 motor, Rev-Tuned Motor, Torque-Tuned Motor, or Atomic-Tuned Motor.
  • Disassembling the motor to change the number of coils and other such illegal modifications are prohibited.
  • If there are indications that the motor cap has been detached, it will be judged as being illegally modified.
  • Depending on the race event, other Tamiya motors may be permitted.
  • Use of motor tune-up spray is prohibited.

5. Batteries

  • 2 R6/AA/UM3 batteries of either manganese, alkaline, or nickel-cadmium types that are readily available on the market can be used.
  • If the battery appears to be damaged in any way, they will not be accepted for safety reasons.
  • Please note that some events do have more specific limitations on which types of batteries can be used.

6. Modifications

Please follow the guidelines below when modifying your car. Also note that for modifications not listed, race officials will have the final absolute authority to grant or deny their use.

  1. Chassis modifications are limited to cutting away plastic material or cutting holes out of the stock chassis. Homemade chassis and homemade parts are prohibited.
  2. Parts used for modification are limited to Tamiya Mini 4WD, R/C Mini 4WD, and Dangun Racer parts only.
  3. Depending on the race event, Mini F Competition Part may be permitted.
  4. Part modifications are limited to cutting away plastic material or making holes in the stock part.
  5. Gear modifications are limited to making holes or shaving away material to reduce weight. All running gears must be installed according to the set gear ratios.
  6. Battery terminals must be installed according to the instruction manuals. Soldering or double-plated terminals are prohibited.
  7. Modifications that cause physical harm to the track, cause injury to any person, or release grease and/or other substances onto the track are all prohibited.
  8. Modifications to the tire's shape are allowed if they comply with the Car Measuring System outlined above. However, changing the material properties of the tire surface (including, but not limited to, applying glue or other substances to the tire surface) are prohibited.

【 2 】 Race Courses

For courses which satisfy the below specifications and are sanctioned by Tamiya, times recorded during races will be officially recognized. All times recorded on original courses that do not meet these requirements will be considered unofficial.

  • Individual Lane Width: 115mm (measured on a straight section)
  • Course Wall Height: 30mm or 50mm (measured from road surface)
  • Adjusting the height and lane width of lane change sections, bank turn sections, etc. for smoother racing operations is permitted.

【 3 】 For Competitions at Official Race Courses
  1. The start of the race will be indicated by a signal from a Tamiya race official or a starting signal system.
  2. Racers will switch on their cars, hold them in the air with one hand, and drop them vertically onto the course at the start signal.
  3. Throwing or pushing the car forward is prohibited.
  4. A racer will immediately retire from a race if their car leaves the track, flips over, jumps into another lane, or if their car's body detaches during the race.
  5. If race officials determine that a racer's car is blocking the progress of faster machines, the racer will be required to retire.
  6. A car's race is completed when it reaches the finish line.
  7. Qualifying and Final positions are determined by either the race finishing order or Time Attack time.

【 4 】 Car Inspection
  1. All racers must have their car inspected by race officials before the race. If any part of the car is determined to be against race regulations, the racer must make the necessary changes in order to participate in the race.
  2. From the time the car passes the car inspection to when the race begins, the car's settings must not be changed and no modifications can be made.
  3. In addition to the pre-race car inspection, other car inspections may occur at any time during the race day at the race official's discretion. If the car is found to be in violation of the race regulations at any of these inspections, the racer's race results up to that point will be disqualified and the racer must make necessary changes in order to participate in subsequent races.
  4. If a machine does not pass car inspection, and cannot be made race-legal, the participant can still take part in the Qualifying rounds for their own benefit, but their times will not be recorded.

【 5 】 Disqualification

If any of the following situations occur, race officials will, at their discretion, have absolute authority to disqualify any racer. Please take care to remember the common manners for a Mini 4WD race to avoid any problems.

  1. A racer's car is determined to have modifications that will cause physical harm to other racers, other cars, or the race track.
  2. A racer's car is determined to have modifications that are designed to deliberately obstruct other cars.
  3. A racer deliberately puts grease or other substances onto the track to affect track surface conditions.
  4. A racer is determined to have modified their car after it had passed the car inspection.
  5. A racer is determined to deliberately touch the track or cars to impede other racers' race progress.
  6. A racer does not follow the instructions of race officials or otherwise impedes the operations of the race track.
  7. A racer has a false start, or is determined to have thrown or pushed their cars forward at the start of a race.
  8. A racer is determined to act against the spirit of fair play or cause distress for other participants

【 6 】 Race Operations
  1. Participants may raise objections to the race officials. However, these objections must be made before the next race begins.
  2. Race officials reserve the right to announce the use of special regulations at any time during the race.

【 7 】 Participant Restrictions
  1. Please be aware that some races have age limitations, so it may be that some participants cannot take part in certain classes or races.
  2. Except for endurance races, it is against regulations to have more than 2 racers using the same car.

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(The information on this page is current as of February 2007.)
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