vacuum discrepency
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This is a discussion on vacuum discrepency within the Tuning: Electronic Engine Management forums, part of the Tech & Modifying & General Repairs category; finally got around to installing my smy gauge cluster (thanks irickchad, still tryna leave you feedback but the system is ...

  1. #1
    rocking hater blockers unseen's Avatar
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    vacuum discrepency

    finally got around to installing my smy gauge cluster (thanks irickchad, still tryna leave you feedback but the system is down). with autometer pro comp mechanical boost gauge and aem wideband o2.

    it seems that my boost gauge reads about 22 in vacuum while the ap reads around 10.2 (both readings at idle). boost is the same reading. whats the deal with this, and is it something i should be worried about?

    edit: i also notice that boost gauge sits at 2 in vacuum when off, so its an even 20 when in idle. still, 20 vs ap's 10 is a big difference.
    thanks.
    Last edited by unseen; 04-11-2015 at 12:43 PM.

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  3. #2
    zax
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    Gauge is in inhg and AP is in PSI.

    22inhg = 10.8psi
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    Quote Originally Posted by zax View Post
    Gauge is in inhg and AP is in PSI.

    22inhg = 10.8psi
    as in mercury pressure? like for barometric pressure? humm thats interesting. zax to the rescue. thanks dude.

    so how come boost pressure is equal in both inhg and psi in gauge and ap, respectively.

  5. #4
    zax
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    Because the AP is correct and not following some ignorant muscle car trend set 4 decades ago.
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  6. #5
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    Quote Originally Posted by zax View Post
    Because the AP is correct and not following some ignorant muscle car trend set 4 decades ago.
    haha okay. thanks again for the input. i guess what i was asking was, even if both are measured in different units, wouldnt they be proportionate on each side of vacuum and boost.

    so if the gauge is 22 inhg and the ap is 10.2 psi, would that parallel be on the boost side as well. just throwing out numbers, 24 inhg boost on gauge and 14psi in ap.
    Last edited by unseen; 04-11-2015 at 02:34 PM.

  7. #6
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    I see it now. Vacuum is measured in inhg and boost is measured in psi. I get it.

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