You have to watch your elevation anything below 3000' you gotta run race fuel or you will have detonation. The amount of nitrous being delivered will change everything as well. I ride really high elevation so you can get away with a lot. If your gonna run nitrous you gotta be able to recognize symptoms of lean AFR and or detonation and always check the plug after first pull of the day. A drop of just 1000' feet can make the differance in detonation.