Power Loss/Whine

[jshoaintnoho]

Alright I have a frustrating problem after my engine swap was completed. The car is a 95 gsx, swapped with a jdm vr4 galant 4g63 with auto tranny (so it has the smaller turbo). A vaccum elimination was performed, not sure if it matters, but thought I would throw that in there. A little while after the swap I lost virtually all power gains whatso ever. I ran 15.5 in the quarter. Now my turbo has always squeeled at it spooled, but now it has an echo. A whine behind the squeel. It begins at 5 lbs of boost. My turbo spools slow as shit and I don't get a power band until like 4k rpm. I tried playing with my afc to see if it could be tuned out, but there is no way. It doesn't make any difference where I put boost or fuel. The same result occurs. 15.5. A little additional info: all intercooler piping is hard, and I checked the couplings, I have a manuel boost controller that spikes a good 3-5 lbs, and my exhaust is completely sealed up. I think it may be a loose intake manifold, it acts like it's leaking out boost there, which would explain a lot, but before I go pay to have someone do it for me, I would like to see what you guys thought. Any information would be much appreciated.

 

[ltvarney]

What's your idle vacuum? Anything from -15 on would be indicative of most boost leaks being closed. The whine could be the turbo going out. I'd check it for shaft play. Wastegate might not be closed all the way also.