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I have looked at the ZZ PCB with a scope. You are correct that there is a voltage booster on the PCB, however this DOES NOT in any way power the motor. Rather is is used to bias the pin used to turn on and off the MOSFETS that run the motor.
The reason the ZZ is slower compared to other cars is that the MOSFETS making up the speed controller have a high "ON RESISTANCE".The ways around this are:
1) add another battery making the voltage drop across the speed conroller less of an issue.
2) change the MOSFET's or add more to reduce the resistance of the speed controller.
3) This is a BIG maybe.....the on resistance of the speed controller is somewhat dependant on the voltage driving the gates of the mosfets. Playing with some resistor/capacitor values to increase the gate voltage MAY provide some improvements. Being an Engineer, If I were designing this I would be driving the MOSFETS gates with the maximum voltage possible. I doubt there are any gains to be made here.
4) Remove reverse. Tying the yellow wire to the red wire does this and provides a small boost in performance with the sacrifice of reverse.
As a side note: I really doubt that the bit delivers 2x the voltage to the motor. I havent seen one and cant say for sure....i'd like to see a voltage reading of the battery voltage and motor voltage to prove this.
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