I can make one faster from scratch in my shop than drive to Home Depot.

 

Totally agree, but applying positive pressure to something that was never designed for it is silly. That's why the smoke test is the correct method.

 

I have pressure tested my intake systems for over 14 years and have never had any issues. Most of the larger boost systems have non stock turbocharger inlet piping! I pressure tested one of my cars this weekend up to 16psi with zero issues.. Found 3 small leaks. The hard one was the hose clamp on the main oil reservoir..

For my customers, I will recommend pressure testing per the Porsche manual which is at the side intake post MAF/filter at 10 to 16 PSI..

If they want to test at the turbochargers>> great...

 

Be careful when pressurizing the intake. At 16psi the 3" plug in the intake will have over 100lbs of pressure action on it. If it pops it could cause a little trauma to the family jewels.. No, I'm not speaking from experience. To leak test the DVs, you need to pressurize from the turbos. When you pressurize from the intake you would have equal pressure on both sides of the DVs. The way to do is to do both tests.

 

if you know the size of the cap that you have to go buy at home despot... ;-)

 

The simple way to test the DV's is to pull vacuum on the control port. If you can't pull vacuum you have a torn diaphragm or stuck piston..