I have a s5 t2 and it will not build boost. I am thinking this is due to a boost leak and have a few questions. The car has a stock turbo, TID, BOV, IC, etc. I have one of these: Boostpro.net : Products - Boost Leak Testers

Is the best way to check for leaks by capping off the intake at the turbo and pressurizing via a schrader valve?

In order to do this, should I need to block off the BOV opening on the pipe between the turbo and IC since it vents back into the tid? Or should the BOV be able to hold the pressure as well?

Should I be able to pressurize the system this way and have it hold 15 PSI? Or would the pressure drop off and exit out the exhaust (or some other way)?

Is there a better way to test?

 

Put it on the front of the turbo.That way you can test from the turbo,through the Ic and pipe and into the engine.
I put a piece of gasket in between the bov and pipe so it doesn't try to push the bov open.
at 10 psi you should hear something.
If you are using a compressor make sure it is a decent one.It needs to feed air fast,as I tried a crappy tire compressor and it did squat.
I found leaks real quick when I did this and it saved me days,Yes Days of looking,wondering,replacing stuff.

 

when you say "front of the turbo", you mean the turbo inlet right? the intake side?

 

^ yes

 

I used the same one. Solved all my problems or rather "found" is the better word!!! Pretty straight forward.

 

You'll likely only need 8-10psi to find your leaks, depending on how well you get the plug stuck in the intake it'll pop out if you run the pressure too high. The TID also doesn't normally see internal pressure above atmospheric, you don't want to hurt it either.

 

You place the Tester on the turbo with a silicone coupler.
The TID is removed and out of the equation to do this test.

 

+1 to this, the pressure requirements are quite minimal. I've always known people to just regulate the compressor down as far as it will go, hooking it up to the charge piping and opening a valve.

Even 5psi or so will show you the leaks in a hurry. Once it passes at a low pressure, then of course up the pressure to ~10psi more than you'll run to make sure there won't be problems down the line.