Just increase the voltage, the motor and setup should be able to handle up to "20%" more. But test it for a long time to make sure it does not threaten the child.
The circuit probably has some sort of over current or self resetting circuit breaker in it. Using a single motor to move the car meant to use two motors would cause it to trip, due to overloading that one motor.So I tested the 1 motor and it's about twice as quick. Safely though. The car is definable start stop. Forward reverse.
The only thing that happened was the car turned off after a couple of quick pedal presses. I had to turn the car off and on again for it to power back up.
Really, what would be very good is a PWM speed controller. A good one uses a double 555 timer IC, a 556, one section creating a ramp wave and the second section working as a comparator to provide a variable duty cycle pulse in response to a variable voltage. That could drive a high powered MOSFET switching transistor very well. It would need a heat sink and the addition of a variable resistor to the pedal. The switch could remain on the pedal to shut off the system completely and prevent the battery from running down when the car was not in use.Some form of control needed, the simplest might be a switch on the start pedal, i.e. initially start in series, at some point switch to parallel
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by Luke James
by Jake Hertz