Hey Guys,

I've been tracing a boost leak in my car for like 3 weeks now. I've replaced a lot of bad vacuum lines (they weren't leaking, but they needed to be replaced) and still had a leak. My vacuum pump valve was leaking, so I replaced that along with the breather hose attached to it. Yet I still have a small leak. I was using the method off a4mods.com (pvc piping with an air compressor) and noticed that my Forge Splitter valve constantly vents, even under small amounts of pressure (5psi). Is that normal for the valve, I did try turning it around just to make sure I had it on right but it still did the same thing.

Also, while I had pressure on the system, I could hear a bubbling in my oil....what could cause this?

Thank guys.

 

Well after some more research, I found out the gurgling is just a lil air passing by the rings, so that's not a big deal.

But I still haven't been able to find anything about the valve venting constantly. Any ideas.

 

The air venting through the splitter dv is possibly due to that method of boost leak testing. That method creates positive pressure in the turbo intake pipe(TIP). The TIP, never under anyother circumstance, has positive pressure. By testing it with the method you are currently using it applies the same pressure to both sides of the valve and the intake system will never see anything like that in real life. It is pre-turbo so at that point in the system it is only vacuum pressure. I would attach the boost tester fitting to the turbo inlet and completely bypass the TIP. See what that does. I've attached a diagram that may help you to understand my theory.

 

That makes since. Thank You!