Boost Gauge Vacuuming 30hg?!? That's impossible!
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This is a discussion on Boost Gauge Vacuuming 30hg?!? That's impossible! within the Interior Mods forums, part of the Tech & Modifying & General Repairs category; so i installed my boost gauge a little while back. the boost is headin all the way up to about ...

  1. #1
    Registered User ASPEN524's Avatar
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    Boost Gauge Vacuuming 30hg?!? That's impossible!

    so i installed my boost gauge a little while back. the boost is headin all the way up to about 25 psi and i only am running a solid 17 psi at the moment. also, at idle, the gauge reads a vacuum of 30 hg. thats practically impossible on earth! lol. i plan on checking out my install this week. any thoughts on what could be causing this, before i go ahead and reinstall? tnanks in advance.

    -mike
    HAD: 2004 WRX
    MODS: http://www.clubwrx.net/forums/showth...01#post1478901

    HAVE: 2002 BMW 323CI Coupe

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    Registered User 04blkWRX's Avatar
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    30 inHg is about 17psi, why is that impossible?
    06 S40 T5 AWD
    Previous: 2004 WRX
    05 CBR600F4i

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    Registered User ASPEN524's Avatar
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    correct me if i'm wrong, but in order to get a vacuum that high, you would most definately need a vacuum inside of a vacuum to get that much pull. it just seems like the whole reading is off. i know my car is boostin 17. it was protuned at 17 and i have read it off my AccessPort at 17. The boost shouldnt be hitting 25. I have a feeling my power wires are crossed where i connected to the clock harness. i'm gonna try reversing them and see what happens.

    -mike
    HAD: 2004 WRX
    MODS: http://www.clubwrx.net/forums/showth...01#post1478901

    HAVE: 2002 BMW 323CI Coupe

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    Registered User 04blkWRX's Avatar
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    Well that's -17psi gauge pressure which is like -2.3psi absolute. When my WRX was running I would see 20 inHg vacuum at idle, yours might not be that far off.

    I'm guessing that if your power wires were backwards the thing wouldn't work at all but I guess you'll find out soon enough.
    06 S40 T5 AWD
    Previous: 2004 WRX
    05 CBR600F4i

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    Registered User ASPEN524's Avatar
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    ya i dont think its too far off. like i said, my psi reading is about 8psi off. so if correct, my vacuum should be about 8hg to high as well. lets see. i hope i can get rid of this issue.
    i'll let you know how it goes when i tear it all apart.

    -mike
    HAD: 2004 WRX
    MODS: http://www.clubwrx.net/forums/showth...01#post1478901

    HAVE: 2002 BMW 323CI Coupe

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    Registered User WRX13oy's Avatar
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    Quote Originally Posted by ASPEN524
    so i installed my boost gauge a little while back. the boost is headin all the way up to about 25 psi and i only am running a solid 17 psi at the moment. also, at idle, the gauge reads a vacuum of 30 hg. thats practically impossible on earth! lol. i plan on checking out my install this week. any thoughts on what could be causing this, before i go ahead and reinstall? tnanks in advance.

    -mike
    hmm. at idle my gauge only shows 17-18 in.Hg vac. if im driving and i let off the gas and still in gear it goes to 21 in.Hg vac
    SOCAL F4#02 OG member

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  8. #7
    Registered User Speedmonkey's Avatar
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    ^ ^ ^ Ditto, 30hg is way too much.
    '04 STI WRB,FP Green'ed and Protuned. (Gone )

    366.7whp/374.1wtq @20psi on 92 octane

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    you gauge sounds off. if it's a mechanical with just the boost line, there's not a lot you can do or that you did. What kind was it, and was it new?

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    Registered User ASPEN524's Avatar
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    it is an electronic boost gauge.. Autometer Nexus series. They're pretty much the best Autometer out there. The entire set up was about 900 for everything. I needed a new map sensor for the boost gauge. it was giving me an off reading.

    -mike
    HAD: 2004 WRX
    MODS: http://www.clubwrx.net/forums/showth...01#post1478901

    HAVE: 2002 BMW 323CI Coupe

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    Registered User unethikl's Avatar
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    im having same issue.
    i installed my prosport elec. boost gauge yesterday, on my 06 sti (stock).
    idle reads about 25 inHg.
    during boost, psi needs to be on whatever the boost level it should be,
    but the pointer goes down after reaching the boost.
    and at WOT on all gears, i only can reach about 10psi....
    maybe leak problem... car feels the same tho.
    any pointers please? thanks

  12. #11
    Registered User ASPEN524's Avatar
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    Quote Originally Posted by unethikl View Post
    im having same issue.
    i installed my prosport elec. boost gauge yesterday, on my 06 sti (stock).
    idle reads about 25 inHg.
    during boost, psi needs to be on whatever the boost level it should be,
    but the pointer goes down after reaching the boost.
    and at WOT on all gears, i only can reach about 10psi....
    maybe leak problem... car feels the same tho.
    any pointers please? thanks
    once i replaced my map sensor, my readings were perfect. maybe try the same..

    -mike
    HAD: 2004 WRX
    MODS: http://www.clubwrx.net/forums/showth...01#post1478901

    HAVE: 2002 BMW 323CI Coupe

  13. #12
    Registered User unethikl's Avatar
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    i could try resetting the ECU and take off and on the map sensor to see what happens.
    buy my car only has 800 miles on it.
    i'm going to try re routing the wires to the clock harness instead of here and there. thanks

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