Blue Hills Raceway

Spec Jet Car Class Rules

Legal chassis are: BSRT G3/G3R/G3RS/G3RSB, Slottech T1/T2/T3, Wizzard Storm/Fusion, Viper V1/V3, RPMs Ghost Cat

  1. The chassis must be stock, readily available, “HOPRA Approved” and cannot be machined, sanded
    or cut except to provide the following:
    a. Add, remove or re-add body mounts.
    b. Reinforce and/or replace pickup tabs.
    c. Add axle retainer.
  2. All front and rear weights and hardware must be used and must be from the same manufacturer as the chassis.
  3. Weight kits must contain 1 or 2 front weights and 2 rear traction weights made of brass only. Total weight kit, including mounting hardware, must weigh a minimum of 1.8 grams.
  4. All magnets shall remain in their stock location. No material or method may be used to restrict the movement of
    the magnets.
    a. Only “HOPRA Approved” Compression Molded Ceramic Grade polymer motor magnets may be used. High Downforce (HD) magnets are not allowed, see SPEC RACER CAR CLASS RULES for specific manufacturer part numbers.
    b. The gauss reading of the motor magnet shall not exceed the following criteria. This is taken after 5 min cool down period and at the lowest point on each magnet as it runs parallel to the rail. Any reading above these figures will be cause for disqualification or rejection at tech.
    MOTOR: 1250 gauss maximum.
  5. The guide pin can be a stock replacement. It may be glued in place but shall remain in any one of the stock
    positions.
  6. The armature must be stock or a hot stock. The minimum ohmage allowed shall be 5.80.
  7. There are no restrictions on the armature bushings or axles. Ball bearings are not allowed.
  8. Gears ratio must be a 7-tooth pinion with a 23-tooth crown gear. No metal gears allowed.
  9. There are no restrictions on front wheels, tires and axle.
  10. Rear tires shall be any non-coated solid silicone, rubber, or urethane replacement tires. Rear wheels shall be
    any double or single flanged replacement wheels.
  11. Electrical systems shall be stock or stock replacement. Adjustable brush tension is allowed. Physically
    attaching brushes to springs (using glue or other substance) or spring arm is allowed. Plated parts are allowed.
    Shunts are not allowed.
  12. The use of glue shall not be allowed on the magnets or to retain the magnets in the chassis.