when i first got my car, at idle the pressure would be around -22.5 to -25 psig. recently, at idle, my car sits at maybe -17.5 psig. i try to drive soft with my car, not really push it hard in traffic to save on gas. any ideas what would cause this?

 

Maybe cause it has warmed up and it's almost summer.

 

i guess. i'm still getting used to my car, so i'm still noticing little things about my car

 

boost/vacuum leak

Mine rides at -20 psig on the highway staying off the gas.

 

mine is at about -20 at idle and we have about the same temps....but its wayyyy more humid down there!!! it could be weather, or it could be a small vaccume leak...but with a supercharged system im sure a vaccume leak would be apparent in other ways too

 

Are you able to hit full boost?

 

well, last time i checked i could, but that was before i noticed this... i might have to test that out

 

What is the problem if he can't hit full boost? Right now I'm having a problem--I'm only hitting 5 psi and the S/C sounds like it is struggling to get air to produce more boost. I've already cleaned the MAF and the Throttle Body, looked at every hose and connection. Can anyone help with this problem??

 

check the superchager gasket or the intake manfoild gasket if not sound like a problem with the wastegate or if you going full out the belt might be slipping