ivai

Okay, so finally got rid of all boost/vacuum leaks this past weekend, the last thing I had to do was replace the Fuel Injector o-rings. I can now pressurize the intake system to 10psi (with an air compressor and the engine off) and not lose any air whatsoever.

HOWEVER

I still get a very loud PSSSSHHHHHHHHH on boost, when i'm at > 12ish psi and flooring it. It kind of sounds like its coming from underneath the car.. I've had this problem for a while now, I had always just assumed it was a boost leak though, but that doesn't seem to be it now.

By the way, I barely have my lindsey MBC turned up at all and the boost gauge shows 15psi consistently.

I'm assuming this is an exhaust leak of some kind.. What do you guys think?

I installed a tial 38mm WG about a year ago.. I'm wondering if maybe theres some gasket I should have replaced that I didn't... What is the best way to test the exhaust for leaks?

I'm going to try and get a good look at the headers and crossover pipe this weekend to see if i have any leaks there..

ivai

bump

jimbo1111

Sounds like you have a 1bar spring on your tial. I also notice a hissing noise that comes from the mbc once I run over 15psi of boost. Maybe this is the noise your hearing.

toddk911

If your MBC has the bleed hole you will hear this.

ivai

I'm fairly sure its not coming from the MBC, since I've got the actual unit in my car, and the sound is definitely audible outside the car..

When I took it to the track, people standing in the pit could only hear PSSSHHHHr when I drove by..

Not sure what kind of spring I've got on my tial... I think I ordered it from SFR.

hally

maybe one of the gaskets connecting your tial is blown

Peckster

Must be your waste gate, check it out.

ivai

Yeah, I'll take the wastegate out this weekend if I get a chance I think. I'll let you guys know, thanks for the suggestions