well i thought tuning the engine was mostly listening to it and seeing how fast the car would run when you put it down and give it throttle? since your already running your car anyway wouldnt a servo connected to the needle just let you tune the car without having to pick it up ?

dude7422 has a point, if these nitrous shots have lubrication added into them, it will help prolong the life of the engine

but imagine such a setup, you hit a button on your tx, and for a fraction of a second your engine bogs while the servo turns the hsn , followed by a huge surge of power as the servo hits the toggle... lift the button and the engine goes back to the way it was
on my radio , you could set the position of the servo between its 'button pressed' and 'button not pressed' state, so if i were to do this mod i could technically tune the engine just like i set my epa or dual rates...