blackblaze427

iTrader: (1)

My little brother went and picked up an 06 9 the beginning of this week. Owner claimed it pushing 25psi and the gauge backs up that claim. However according to my feel, and the bov, the car is building boost while in vaccum. In my small amount of experience I didn't think that to be possible. Is the gauge no good? Or can it be adjusted at all? Or am I just an idiot?

Here's a short list of mods

-Bren tuned
-Walbro 255
-Injen intake and upper intercooler piping
-AMS lower intercooler piping
-AMS full exhaust including high flow AMS catalitic convertor
-Hallman manual boost controller

egis

is it electronic gauge or mechanical?if elecronic then sender might be bad.

blackblaze427

iTrader: (1)

They are autometer nexus gauges so I think they're mechanical

mt057

iTrader: (6)

How much vacuum is the gauge reading at idle.

How much vacuum does it read when you and the bov feel like its boosting

blackblaze427

iTrader: (1)

At idle it's reading 16inhg, about 6inhg is when you can start hearing an audible blow off.

EJW2202

iTrader: (9)

So from what you're saying you think the car is boosting more than 25psi? Does it feel that way at WOT?

TommiM

iTrader: (19)

if its a mechanical gauge pull off the vacuum line from the gauge and test it with a vacuum tester like a mighty vac. youll only be able to test vac readings but youll be able to compare gauge readings.

boostedmkiii

iTrader: (3)

My BOV (TiAL) releases air in the same way - no boost, either a quick short rev up or easy driving with quick throttle release.

From what I am understanding in your posts, this should be a normal condition. Depending on your BOV, the spring tension should be set in relation to your vacuum at idle. This allows the unit to release air anytime it sees a higher pressure and then quickly goes back to idle vacuum levels (at least).

It is safer on the turbo to have a proper fully functioning BOV that releases more frequently (such as both of our situations), than to have a "stiffer" spring rate that almost forces you to build 10+psi or else it won't open. The latter would result in compressor surge during most daily driving/shifting.

Just because it is operating without boost is fine, it is reacting to the change in pressure in order to
Keep your turbo happy... You should be fine.

rich3389

iTrader: (1)

Does the gauge read "0" when the engine is not running?

GTijoejoe

iTrader: (25)

ooooww good question

You don't necessarily build boost to hear a BOV noise......

slimjim1804

all of this ^
what bov is on it? open filter element?
turbo cars are very audible with aftermarket intakes.


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blackblaze427

iTrader: (1)

It's a stock bov and open filter element, I think it's fine I was just worried about getting an accurate reading and of all the reading I've done and from you guys have been sayin I positive it was just me over thinking. Thanks for all the help fella's

impact blue

iTrader: (1)

Does it read at zero when you turn it off? if it doesn't its probably bad.