Originally Posted by
NotSure
OP is running a PD blower, which should have somewhat different valve event requirements than a turbo. From what little understanding I have, a PD blower engine likes early EVO events to let the exhaust out, so retarding the cam will make that worse. I am running a stock VVT Gen4 with a PD blower and it seems to have improved since I zero'd out the cam retard and "parked" it. No empirical data though, just what I see in MAF g/s changes, in a very non-controlled environment, lol. It seems directionally correct to retard the cam as rpm goes up, but I think if you have a N/A cam to begin with, retarding the EVO ends up hurting you overall with a blower. An off the shelf PD blower cam usually has EVO much earlier than a N/A cam. With turbos you have a spool factor and some other science stuff to consider which I know even less about.
shinysun, you could try, preferably back to back on the same day, running the cam as they say then zero out the cam retard and run it again, monitor away and see if there is a change in MAF readings. You might ask TSP as well, as it sounds like it was not a blower-specific cam?