Well there aren't really that many variables, and all of them combined will only account for a +/- .5 psi difference based on experience with other supercharged cars using the M90 and M112. These readings are typical of a car with stock type cam moderate exhaust and free flowing intake. Ported heads, headers and cams with lower than 112* LSA tend to have lower boost pressures, since boost is really nothing more than the inabality to pass the air from the supercharger through the engine.
one of the parameters I use in the calculation is barometric pressure and that makes the highest difference. I just wanted to see ihow well the formula I used works for the 3.8l SC'd engine too.
Jeff
