a/f ratio when under boost?

[luckythirteen13]

well i just bought a brand new s-trim supercharger kit. i plan to run about 8-9 lbs of boost. right now im running n/a at 13.5:1 but what should i shoot for when i tune the engine with the sc on it? the kit comes with an fmu and i have a 255lph pump already in.

 

[Daggar]

12.1 to 12.5 is what I shoot for. The cloer I am to 12.1 the more power it seems to make. Anything over 12.5 worries me and should worry you as well considering the discharge temps associated with a centrifugal are a large contributer to detonation.