I am building a car.

I have been playing around with funky tree for three hours now and I can't even make the the engine make a sound.
I have tried this:

abs(Throttle7/sum(*max+2&min+1)rate(1.23544383+12) on a engine(s)

IDK but,when I use this, my car flip and explodes on the runway for no reason.

Please some one tell me a reasonable input for a engines( mostly a car engine or any other engine, but mostly the car engine).