Blue Hills Raceway

Spec Racer Car Class Rules

Legal chassis are: BSRT G3/G3R/G3RS/G3RSB, Slottech T1/T2/T3, Wizzard Storm/Fusion, Viper V1, 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 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 traction and motor magnets may be used, see below for specific manufacturer part numbers.
    b. The gauss reading of the traction or 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. TRACTION: 1680 gauss maximum MOTOR: 1250 gauss maximum.
  3. The guide pin can be a stock replacement. It may be glued in place but shall remain in any one of the stock positions.
  4. The armature must be stock or a hot stock. The minimum ohmage allowed shal be 5.80.
  5. There are no restrictions on the armature bushings or axles. Ball bearings are not allowed.
  6. Gears ratio must be a 7-tooth pinion with a 23-tooth crown gear. No metal gears allowed.
  7. There are no restrictions on front wheels, tires and axle.
  8. 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.
  9. 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.
  10. The use of glue shall not be allowed on the magnets or to retain the magnets to the chassis.

Magnets allowed:

BSRT
#277 – G-Force C4 H-D Motor
#290 – G-Force C4 Motor
#284 – G-Force C4 Traction

Slottech
#81C – G6 Motor
#86C – G6 Traction

Wizzard
WS60 – Stock Storm Motor
WS61 – Stock Storm Traction
FS40 – Fusion Level 4 Polymer Motor
FS41 – Fusion Level 4 Polymer Traction

Viper Scale Racing
12000 – Pro 4 Motor
12001 – Pro 4 Traction
22737 – Pro 4 Maxi Traction
22816 – Viper Pro 4™ SR

RPMs
RPMsHF-LDM4 – Hyper-Force Level 4 Motor
RPMSHF-L4-T – Hyper-Force Level 4 Traction