Could my boost gauge be this incorrect?
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This is a discussion on Could my boost gauge be this incorrect? within the General Maintenance, Troubleshooting & Accidents. forums, part of the Tech & Modifying & General Repairs category; So a bit of back story. I purchased my car about 6 mons ago from a friend of mine, he's ...

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    Could my boost gauge be this incorrect?

    So a bit of back story. I purchased my car about 6 mons ago from a friend of mine, he's taken good care of the WRX and I am doing my best to as well, interestingly enough he told me the car was set up to run about 18lbs of boost and that the gauge was wildly off but he and the tuner, a very reputable guy here in CO couldn't figure out why. The gauge reads over 25psi when its apparently only 18....is that possible? Its hooked in right where it should be at the manifold......what should I do here folks.....any thoughts would be helpful...
    Thanks

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    Good news, everyone! xxxxxxxAnub1s's Avatar
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    At the manifold? Where at the manifold? It's supposed to be t'd into the line that runs to the factory BPV, about 2 inches down from where it connects to the BPV. The gauge may be faulty, if it is indeed hooked up correctly.

    I'd want to do some datalogging, just to make sure there aren't any issues with the car at this point.
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    Yea that's the plan when it gets a bit nicer here...car runs fine. I'll take a shot of the line and post it too.

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    The first pic on this thread shows the same placement as mine...

    vacuum line for boost gauge

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    Good news, everyone! xxxxxxxAnub1s's Avatar
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    I don't think I've seen anyone use that line personally, aside from that guy anyway. Subaru hooks the SPT gauges to the BPV line, it's in their instructions:

    http://www.iwsti.com/forums/attachme...0&d=1233941163

    May want to fix that line and relocate the tee to the BPV line, see if that works.
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    Thanks for the heads up. I'll let you know how it goes...

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    Moderator Donkey's Avatar
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    Could my boost gauge be this incorrect?

    The BPV line is hooked directly to the intake manifold. Any source off the manifold will work.


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    Good news, everyone! xxxxxxxAnub1s's Avatar
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    Quote Originally Posted by Donkey View Post
    The BPV line is hooked directly to the intake manifold. Any source off the manifold will work.


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    Good to know.
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    OMG WTF MainFrame's Avatar
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    What kind of boost gauge is it? Some times gauges are wrong, especially cheapo ones. I would look at how much boost the MAP sensor is reading and go by that.

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    Pro-Comp gauge...I'll do a few logs tomorrow if it's warm enough.

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    Pro Manscaper Mikie13's Avatar
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    well, what does your idle vacuum read? Are you positive the gauge is zero'd out properly when the car isn't on?
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    No I'm n not sure. My vac gauge reads about 30 at idle if I remember correctly...

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    Registered User wrx50's Avatar
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    Could my boost gauge be this incorrect?

    I'd be willing to bet it is not 30 at idle. More like 20. If it is in/hg
    Last edited by wrx50; 02-01-2013 at 05:03 AM.

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    Moderator Donkey's Avatar
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    Quote Originally Posted by SRivers33 View Post
    No I'm n not sure. My vac gauge reads about 30 at idle if I remember correctly...
    It should be 18-20 inHg at idle.
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    Registered User Ingo's Avatar
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    Should be dead on zero with ignition on and engine not running...
    You can't have everything - where would you put it?

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