Alright, let me back up here a bit. My car has always been a bit of a dog in 3rd. I go through 1&2 VERY fast and 3rd just never felt right. Garrett even noticed it watching my car at the track. This is an RB25DET we are talking about here.. 2.5 liters.
I have always had a compressor surge (or at least it sure sounds like it) in 3rd past about 1/2 throttle in the upper RPMs. I suspect this really has something to do with it. I have tried everything I can think of to eliminate this situation. I have messed with the tune a bit, changed to new I/C plumbing etc.. thinking it was a setup problem. I am now wondering if the t3/t04e 60 trim .63ar exhaust housing is just a poorly sized turbo.... I do spin this motor to 7800 btw.
Boost level doesn't matter either. I run a tial external gate and an HKS boost controller, I had a greddy and it did the same thing. I have this situation from 14 psi spring pressure all the way to 25psi.
I really want to get this solved, can anyone shed ANY light?
Thanks.