Tuned class

Tuned class rules are based on DXN Provisions Tuned Class as an introduction to modified racing, without the need of specialist tools and knowledge.

Usable machine types

Only Mini 4WD REV, Mini 4WD PRO, Racing Mini 4WD, Super Mini 4WD, Fully-Cowled Mini 4WD, Aero Mini 4WD, Mighty Mini 4WD, R/C Mini 4WD, and Truckin’ Mini 4WD machines are permitted. Further restrictions on machine types may be possible depending on the race event or race class.

Machine Assembly

All machines must be four-wheel drive. Modifications that result in rear-wheel or front-wheel drive are prohibited. Bodies should have stickers applied or be painted, and must be securely attached to the chassis. Please be warned that bodies which are particularly small, or those which it is difficult to check are painted or have stickers applied, may be prohibited. Home-made bodies are prohibited. 

All machines must go through car inspection and machines that do not pass inspection cannot participate in the race. As a general rule, machines must be assembled by the racer. Some exceptions may be applied. Please ask Race Officials.

Machine dimensions

All machines must have a 4WD setup and will be subject to the same measuring system as shown below.

  • Maximum Car Width: Under 105mm

  • Overall Car Height: Under 70mm

  • Overall Car Length: Under 165mm

  • Minimum Ground Clearance: At least 1mm

  • 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: There is no limit on the amount of rollers that can be used.

  • Mass Dampers: The installation positions of rotating mass dampers are no longer limited.

When adding parts to the bumpers, side guards or the chassis, please note the zone restrictions below.

※Definition of Bumpers – For MS chassis, the bumper is the section on the Front or Rear Unit not including the Bumperless Unit. On other chassis, bumpers are the sections forward and rearward of the front and rear gearboxes respectively.
※Definition of Side Guards – Parts that extend from the sides of the chassis between the front and rear tires.

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  • Parts which extend around the outside of the wheels to completely frame the chassis are not allowed.

  • Parts attached to the front bumper cannot extend past the line of the front axle.

  • Parts attached to the rear bumper cannot extend past the line of the rear axle.

  • Parts attached to the side guards must remain within the lines shown: (back edge of Front Tire & front edge of Rear Tire)

  • Chassis: Extension parts which are attached to the chassis itself are subject to the same zone restrictions as similar parts attached to the bumpers or side guards.

※There are no rules for parts which pass above or within the outside edges of the tires.
※There are no rules for mounting rollers, etc. to the body as long as they are above the level of the wheel axles. If they extend below this line, they will be subject to the same limits as parts which are attached to side guards.

Body

  1. Any body type, plastic or polycarbonate is allowed.

  2. Racers may choose not to install all body parts.

  3. Modifications, cutting or drilling of the body is not allowed.

  4. Application of at least two decals are required.

  5. Paint is optional.

Motor

Machines may use the kit-included normal motor, Rev-Tuned Motor, Torque-Tuned Motor, Atomic-Tuned Motor, Rev-Tuned 2 Motor, Torque-Tuned 2 Motor and Atomic-Tuned 2 Motor. 

Mini 4WD PRO machines may only use the kit-included normal motor or motors designed for use with the Mini 4WD PRO series.

  1. Disassembling the motor to change the number of coils and other such illegal modifications are prohibited.

  2. If there are indications that the motor cap has been detached, it will be judged as being illegally modified.

Batteries

Any brand R6/AA/UM3 batteries are permitted. If the battery appears to be damaged in any way, they will not be accepted for safety reasons. 

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. All chassis modifications are prohibited (cutting, drilling etc).

  2. All genuine Tamiya Mini 4WD option/upgrade parts are permitted, and must not be modified.

  3. Modifications to the motor are prohibited.

  4. Modification, sanding, changing the material properties of the tire surface (including, but not limited to, applying glue or other substances to the tire surface) are prohibited.

  5. No cutting/reshaping of parts such as FRP & carbon plates.

  6. Sanding and modification of gears is prohibited.

  7. Tyre additives are prohibited.

  8. Cleaning of tyres is allowed.

  9. Rubber Tubing or Plastic Balls MUST be used to cover any protruding screw threads.

  10. Rubber Tubing may not be used for anything other than covering excess threads.

  11. Car catcher material not allowed.

  12. Polycarbonate material only to be used as body and body parts, not for other uses.

  13. Wheels or mass dampers must not be used as stabilisers.

  14. Body dampers, “lantern” dampers are prohibited.