mffarrell

Here is what the factory manual says.

mffarrell

Also, markski's test is at the y pipe. Is that where you test or at the turbo outlet hoses?

Thanks!

This is all new to me.

Jferrante

Markski shows it multiple ways maybe not in the above link - do it the way is pictured on page 1 and depicted here
- disconnect the hose from the turbos and pressurize from there. Dont over complicate it. You can remove the airbox or keep it in.

mffarrell

Thanks jferrante!

RClurg84

Yes start at the turbos. Then if you have a leak and need to pull the airbox then do so. Like said before if you heard that loud pop and it blew something off you either won't build pressure or you will hear it right away. Any other leaks you will probably here the hissing sound. If you want to find any tiny leaks use the soap/water spray to find those.

mffarrell

Update:

I didn't find any hoses torn or ripped-off, but the left intercooler hose seal is leaking pretty bad (the hose that connects to the turbo). The system will only hold 5 psi, when I apply 20 psi there is a large leak at the hose/intercooler connection.

Is this a simple matter of re-seating the hose or replacing the 0-ring seal?

Once I get this leak fixed, I will need to check for others.

Thanks guys for all your help!

RClurg84

Where did you start your leak check at? These are the intercooler hoses connected to the turbo both have to be plugged with silver caps. If possible post pictures just to make sure there is no confusion.

mffarrell

I have have the exact setup as you. How long should it hold 20 psi?

RClurg84

And it's leaking where one of the caps are? Only thing holding the hose to the turbo is the band clamp.

RClurg84

Also it takes a good amount to get the system under pressure. I wanna say it took a good 45-60 secs to get it up to 1 bar of pressure. And I was filling with 2 bars.

mffarrell

The left Intercooler hose is leaking. I replaced the oring, now no leak. But, the system loop will leak from
20 psi to 10 psi and stay there. Is this normal or should it hold 20psi indefinitely?

RClurg84

Pm sent

nbressette

At least for me it wont hold forever, once I fill the system to 20PSI there is a slight persistent "darth vader" air sound that is either due to an open valve in the engine or air blowing past the seals into the oil pan. Some other pro can chime in there.

From my conversions with pros the main thing you're looking for with a pressure test is sudden drops, inability to hold pressure due to check valves, and / or hissing from leaks.

Oh ,and I test from the front of the turbos so that I'm also testing the turbo outlet going to the intercooler for leaks. Testing from the MAF never made sense to me since you won't be testing the DVs (pressure will be equalized on either side) and you're testing piping at a PSI that it will never be subject to.