I just checked and it's less of a bug and more of a design limitation. Certainly not intended though and I'll fix it some time in the future.
Yeah, okay, i`ve found the key to activate nitrous anytime...stupid me apparently the bug is that the n2o system has a rev limiter built into it the fact that it keeps shooting flames out has nothing to do with nitrous tho... anyway you keep it just right at the redline it`ll keep shooting flames... but now that we`re on the subject of rev-limiters and flames... any possibility of turbo anti-lag systems that keep the pressure up? edit: "vanilla" Bng n2o has rev-limiter... mod supernos does not, overrevs to death...