woods4

01 s4, running x chip, was boosting close to 20psi until about 2 weeks ago, then max was 18 now im lucky to be getting 15 psi(according to my boost gague and butt dyno) vacum at idle is @ 15, not 17~20. visual check of 710s, samco tbb etc....no leaks...no vag yet(on the way) still under warranty...swap ecu's and take it to the stealer? i'd rather fix it myself...if i knew what it was. anybody help? tia-

lemieux@curbside

see if the t connector for the boost gauge is in place and if you used the FPR line check that too.. did you pressure test it?
check the vac lines in the back of the intake manifold and F hose if you have one (see if there is oil and dirt around it)

zeus1

VAG, pressure test the system..

WindyCityS4

I agree with what they said, sounds like a leak. But 20 psi on KO3's? Isn't that a litle high.

lemieux@curbside

he's talking about peak i think.. that would be normal ..

WindyCityS4

WOW, my MTM is weak sauce.

woods4

thanks all, will pressure test-

JasonS4+Festicle

You should try the older version APR.....

WindyCityS4

I don't like what that does to my turbos....

Mortt

tested everything, replaced all the mod'd hoses and clamps. Took it in last week and they replaced the head gasket and cam shaft tensioner seal. hoping when i get it back today all will be fixed. warranties are good things, though.