There have been diffrent PCB mods but all have sketchy results. What I recommend is to buy a bit clone with the same Freq. and see if the zip controller works well with it. If so switch the PCB.
The issue with the zips is the PCB doesn't allow enough amprage to the motor.
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1999 Super Modified Zinc Yellow SVT Mustang ZZ
Bit PCB MOD
It's a sleeper! hehehehe
M/S Mitsubishi EVO Lancer w/modified clone motor
M/S Nissan Skyline
M/S Honda S2000
Has anyone tried using a simple 2n3906 (or equivalent) switching transistor circuit with a direct connection to the battery? What is the voltage going to the motor?