Loss Of Boost

[2face]

the car pulls 18lbs of boost till about 3500 to 4500 then it bleeds off to 10-12 lbs of boost.. WTF??? any help please, i checked the''valet'' mode the bypass is not open...:cryying:

 

[Posi]

check for belt dust around your upper pulley. That should be your culprit.

(and in your sig it's "mod's" and not "modes")

 

[mike302]

don't mean to Hi-jack your thread, but I have the same problem and I would like to know what could be causing it!

I was around 15 PSI at the dyno tune and after a month or 2 started hitting 11-12PSI and feel power loss???

 

[TrickStang37]

the car pulls 18lbs of boost till about 3500 to 4500 then it bleeds off to 10-12 lbs of boost.. WTF??? any help please, i checked the''valet'' mode the bypass is not open...:cryying:

try doing a leakdown test.