nitrous is simply a way of stuffing more oxygen into the combustion chamber. for model engines we have a similar system, nitromethane.

it should be possible to set up two fuel supplies- one with normal fuel and one with a very high percentage of nitro- and a servo controlled valve to switch between them. you would also need a separate needle valve for each fuel or a way to richen the flow when you switch to the "power" fuel.

dave