[2nedSTI]

I tried searching and it pwned me Anyhow, what psi whould a stock 04 STI be running? I have a very high pitch whistle at boost, and Im pretty sure that it is due to a leak........just wondering if I am losing power due to this leak??? Thanks

[2nedSTI]

sorry mods, thanks for moving

[TuffStuff]

should hit around 14.5 psi peak then tapers down.

[SubaSTi04]

Do you have any mods?

[nasti05]

yeah 14.5 any bov. or tbe.

[2nedSTI]

car is completely stock, to the best of my knowledge anyhow..

I am only seeing 7.5 psi steady!!! What the hell! What do you guys think could be the problem here?

EDIT: I did the silencer delete mod, thats it.....stock exhaust, diverter, etc.

[Flipn]

you may have a boost leak somewhere..

[2nedSTI]

I think that I read somewhere that the high pitch squeal that I am hearing is caused by a leak, is this true? Also, where are the most common places for the leak? I am going to go out and look at the car again to see if I notice anything. Thanks for all the help so far.

[johnlude85]

check all your vaccuum lines and the inlet for leaks. if you dlnt visually see anything, get a can of carb cleaner and spray all the lines and the inlet down. if your rpms change suddenly when you spray a certain area with the carb cleaner, there is your leak. good luck

[2nedSTI]

I think that I found the problem

The black inlet hose from the intake box has a hole in it right where it clamps to the turbo. Also, the hose that goes from the turbo to the intercooler (red 90) also has a hole in it!!! I found some oil in the red hose, as well as in the diverter valve hose.

How serious is this?

[2nedSTI]

need help immediately please!!!

[Turbineguy]

Oil in the elbow is normal. It's caused by some blow-by. Unless it's alot of oil then it could be turbo seals. The holes in the elbow and the inlet pipe are def going to be your problem as far as boost goes. Replace the elbow with a stocker and get yourself a new inlet pipe (Perrin, APS, Samco, etc.). Be aware they are a pain to install though.

[2nedSTI]

Originally Posted by Turbineguy

Oil in the elbow is normal. It's caused by some blow-by. Unless it's alot of oil then it could be turbo seals. The holes in the elbow and the inlet pipe are def going to be your problem as far as boost goes. Replace the elbow with a stocker and get yourself a new inlet pipe (Perrin, APS, Samco, etc.). Be aware they are a pain to install though.

Yeah, it was a pain to get it pulled away from the turbo to inspect it! The elbow is the stocker, and which of the aftermarket inlet pipes are better?

[scubadiver424]

APS IMO, I just like the build quality of the APS Inlet, its solid metal as opposed to rubber

[RacerXS]

Originally Posted by 2nedSTI

Yeah, it was a pain to get it pulled away from the turbo to inspect it! The elbow is the stocker, and which of the aftermarket inlet pipes are better?

Get the APS inlet, its the best. The Perrin one can collapse under boost (mine did), I would stay away from all the silicone inlets.