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-   -   Vacuum leak? (

subienewbie06 11-14-2012 05:57 PM

Vacuum leak?
What's up guys, this may be posted in the wrong section and if so my bad. So I just installed defi bf series gauges and my boost gauge is showing me my vacuum at idle is about 17 inHg, and my boost max at wot is about 13.5 psi but tapers down to like 9 psi by redline. Do you guys think I could have a vacuum leak somewhere?

psinuse 11-14-2012 06:48 PM

Nope that's almost perfect.

subienewbie06 11-15-2012 06:43 AM

Okay thanks a lot. Also I was wondering, is it normal to hit a higher peak boost at part throttle? Mostly like passing on the highway. Sorry for the newbish questions, but this is my first turbo car :)

pzr2874 11-15-2012 11:57 AM

As long as you aren't "spiking" over a lb or so. Should be ok.

Downshift to 4th when doing that.... don't lay into 5th

subienewbie06 11-17-2012 04:44 AM

Hmm. Well it'll do it in fourth gear also. It just depends on my rpm's and throttle position. Peak at wot is about 13.5 psi while my peak at part throttle is 16 psi for a brief moment. That seems like quite a "spike." Does something seem wrong here?

pzr2874 11-19-2012 06:34 AM

That's not normal.... is it really cold outside when you do this? And the car is at normal operating temp?

subienewbie06 11-29-2012 03:29 PM

Sorry for the really late reply.. but to answer you question Paul, no it doesn't seem to matter how cold it is outside (although it's easier to replicate when colder). Also the car is at normal operating temp. I try to stay out of boost as much as possible until it reaches normal temps.

pzr2874 11-30-2012 05:33 AM

Mods? Tune?

subienewbie06 11-30-2012 03:31 PM

The current mods to the car are a gfb bov, and a cat-back exhaust. I'm running a cobb ots stage 1 tune for now.

psinuse 11-30-2012 04:23 PM

You BOV needs adjusted, more really you need to put the stock BPV back on.

pzr2874 12-03-2012 05:43 AM


subienewbie06 12-03-2012 11:42 AM

If i were to just keep the bov, should i tighten the spring preload or loosen it?

psinuse 12-03-2012 02:37 PM


subienewbie06 12-03-2012 03:30 PM

okay thanks. I'll adjust it and see if it helps

subienewbie06 12-04-2012 01:41 PM

Well i turned the preload screw a half turn ccw and now it'll hit about 13 psi under the same driving senarios!Thumbs Up Thanks for all of the inputs guys

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