already running 15psi. What do you mean you are going to up it some more? Word is 17psi is max b4 you risk running lean or worse... If you are relying on a detonation sensor to limit detonation, you are already on a very slippery slope. Like Spongerider says, get some command and control going on in the engine mgt systems first. gordo
_________________________________________________ What's the difference between Daytona and New York??