Originally Posted by TVT_DESIGN

I'm scratching my head on this one...

Ok, so we finally got to data log our newest car. It has a 185mm pulley and machined 70mm SC pulley, yet we are only registering 20 psi on the boost gauge. I was thinking we would see somewhere in the 25-26 psi range, no?

All connections are tight. Gaskets are new and sealed. Boost gauge is plumbed in Y-pipe. It's a Prosport gauge. Do you think it could be the accuracy of the gauge?

Also the AFR doesn't get leaner then 10.9 through the entire RPM band, even on a 3rd gear WOT run in 20 degree weather. The fuel system is adequate. I think it's running too rich actually and we are leaning it out a tad.

Doesn't the 185mm boost over 20 psi?