98 GST Turbo problem

[mjvargo]

Well my brother an i both have GST's his is a 97 and mine is a 98. My car has one major differnece to his, my turbo starts spolling around the right time, but i dont get boost untill around 4500 rpm. Once i hit around that point the boost shoots up and i start getting power. I can hear the turbo spoll but i get no power from it until around 4500. This only happens when i slowly inscrease the throttle. It doesnt happen as voilent when i accelerate hard through the gear. DOES ANYONE KNOW WHAT THE PROBLEM COULD BE?

 

[diablos991]

Do a boost leak test. Also be sure that your plugs are gapped correctly and your plug wires are good. But to me it sounds like a boost leak.

 

[kenamond]

Did this just start happening? If so, did you make any changes recently?

Could be a boost leak.

Do you have a logger? That would help.

 

[TSIMonsteR]

B O O S T L E A K!!!!!!!!!!!!!!

 

[mjvargo]

i did a boost leak test and my greddy type rs had a leak because the gasket was a piece. So i replaced that and now i increased the boost and now another leak? Where do you think it could be?

 

[diablos991]

Throttle body seals, or injector seals..... Ust soapy water. That will help you pinpoint your leaks.

 

[kenamond]

i did a boost leak test and my greddy type rs had a leak because the gasket was a piece. So i replaced that and now i increased the boost and now another leak? Where do you think it could be?

Apparently, it could be everywhere except your BOV gasket

All hose couplers, TB gaskets, TB shaft, BISS screw o-ring, vaccuum lines, PCV valve, injector insulators, intercooler, IC pipes, intake-manifold-to-head gasket, and BOV (the valve, not the gasket - you fixed that already). Then there could be leaks in a test that aren't boost leaks but would require attention if they did exist: worn rings, valve guide seals, valve seats.

Did I miss anything?

A spray bottle filled with extra soapy water is your friend (don't use it to test for the engine interals, though )!