Is it possible to increase the rotation speed of a 9V DC motor?

Question

Arduino

In general, I have a radio-controlled car. The remote control for it was lost a long time ago, so I decided to make control via Bluetooth. I used motor shield + arduino to control the motors, but the motor (s) spins slowly, they can’t even move the machine, however, before everything went, and not slowly. At first I thought that the matter was in the arduino, I connected it directly to the crown (it gives out 7.9V, I checked it with a multimeter), but the machine never went. From all this I concluded that on the native board, in some way, the "power" of the motor increased, so to speak. On the board (native) there are 13 transistors, a microcontroller, resistors, an antenna, ceramic capacitors and 4 capacitors of 100 and 220pF each (I know that information without the circuit itself is useless, but still). I'm not very strong in electronics, but I know that capacitors accumulate charge, maybe it's them? So, how to make the motor move the machine?

Answer 1

What kind of batteries were in the car before you decided to break it? The fact is that the crown is not designed to deliver high power - you need more solid batteries.
I think that you screwed the crown because it is convenient to power the arduino from it.