Need help! Car wont boost....

[Randy08]

OK my setup is a 95 talon awd with eprom,6 bolt swap,sbr g50 turbo, turbonetics 38mm external gate, big fmic, 1g bov recirculated, and a turboxs mbc (dual stage). heres the problem, my car would boost fine before and then one day it just wouldnt boosy. Like it drove beautiful and veryresponsive until around 3k when it would usually build boost. It would then just lag where I would normally be boosting. the vacuum gauge read -1 or 0 while at wot. No boost leaks, I already vacuum tested the wastegate it held up to 20 thats as far as I needed to go because it was holding something so its good. Also it is NOT stuck open Ive checked several times. The vacuum lines go from the bov to the intake manifold. The compressor housing to the boost port on the wastegate with the mbc in the middle of those two lines. Turbo is good very minimal shaft play and blows no smoke. What could this problem be? Im just stomped by it right now. bad intake manifold gasket? How can I check that? Any input guys is appreciated!! Thanks
-Randy

 

[Randy08]

any ideas??

 

[->PrOjEcTGS<-]

Yep I'm guessing a major boost leak. Or a wastegate malfunction.

 

[ccb21]

Yep I'm guessing a major boost leak. Or a wastegate malfunction.

I would have to agree, and the only way to check the gasket is basicly to check it your self or just replace it

 

[xsboost]

I'd check the exhaust manifold gasket, manifold to turbo gasket, and turbo to O2 sensor gasket. Is it gated off the O2 housing or manifold? Either way check that gasket too. Also, check for cracks in your pre turbo and pre wastegate exhaust components.