[lowerdfool]

I figured the zipzaps have a regulated current of power to the motor. Axon found that the voltage was close enough to the same as a bit, but not the current. I'd imagine his idea for an external relay would probably work. I'd be willing to bet if you were to figure where on the zz's board the resistor is you could probably remove it or add a few more in parallel to drop some of that resistance on the current which would make the car speed up.