Vacuum leak? Help me locate on GTR..

[underground]

Hey Guys,

Well, I have had this air leak sound coming from somewhere for almost three weeks, can't seem to locate it exactly... Sounds like its coming from underneath the intake manifold, but I may be completely off....

Anyways, tonight I'm driving the car, and my boost shoots up to 20 PSI.. I'm at factory boost, so I know I have a boost leak...

The car doesn't feel nearly as strong as it used too..

After letting the car sit and cool down at a friends house, I drove it back home and the boost was back hold at factory 9 PSI the whole way home, with no overboosting... kind of weird...

Background:

At idle, when I noticed it overboosting, it was at 0 PSI vacuum....

Before the little overboost episode tonight, with the air leak sound, it was at 15 PSI vacuum...

Any suggestions? How many vacuum lines are on this motor? What vacuum should I be at?

Chris

[underground]

A coupe of my friends have suggested that the car should idle around 30 PSI vacuum being a V6 TT..

I don't have factory specs, so I'm simply asking..

[N I B]

RB26 intake to throttle body to plenum gaskets are prone to leaking.

[underground]

Is that a OEM part I should look for? Or do I need to buy those from like Tomei?

[Blitz]

RB26 intake to throttle body to plenum gaskets are prone to leaking.

What Steve said. I had this very problem on my GTR and used a Tomei gasket kit to replace the gaskets around the intake.