just like the title says, i obviously have a boost leak according to my boost guage, But for some reason as i rip through the gears and shift @ 8200rpm on my b16t i lose boost in first gear and second gear as well. Now if i do a third gear pull it holds boost. This thing is driving me crazy because ive already pressure tested the i/c as well as replaced hose clamps with t-bolts and couplers, I also checked for warpage at my turbo mani. flange that bolts to my head. Everything ive checked for is in good condition, so what could be causing my leak????
any and all suggestions are welcome...
thanks

 

Did you check all your vac lines?

 

just replaced all vac. lines todays and results were negative!!, Any other suggestions???
thanks again..

 

how much of a loss are we talking here? is your gauge electronic or mechanical? mechanicals tend to be off a lil bit. did you check for where the turbo bolts to the manifold?
take a look over your charge pipes also.

 

boost controller is set at 10psi and by the time i shift its at about 4-5. The gauge is a mechanical and ive also replaced the gasket where the turbo bolts to. For a moment i thought it might have been the boost controller so i disconnected it and ran straight off the w/g which is set at 7psi and still drops to about 4psi...