We're running our cars lightweight... usually put between 7 and 28 grams around the front bulkhead depending on the track. The more traction, add more up front to get steering; if the track is slippery take weight out to get the front end to "release" the turn and give stability on exit.
Dan is running 14 grams in the rear of his car too; 7 on either side of the motor.
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