What should boost be at idle?
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This is a discussion on What should boost be at idle? within the Interior Mods forums, part of the Tech & Modifying & General Repairs category; I'm trying to figure out if the boost guage function on my TT is accurate. At idle I get -53/-54 ...

  1. #1
    Registered User PKer's Avatar
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    What should boost be at idle?

    I'm trying to figure out if the boost guage function on my TT is accurate. At idle I get -53/-54 Bar. At full boost I get 1.01 but holds steady at .99 does that sound right for stock ECU no boost controller?

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    Registered User Vostok 7's Avatar
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    Um, well, a TT is different than a WRX, so I can't say but I read 10-20 inHg vac at idle with a 15psi max boost, 14psi steady max boost.

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    Registered User PKer's Avatar
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    Sorry about the misunderstanding TT was supposed to stand for turbo timer. My Blitz turbo timer has a boost guage function which is part of the reason I bought it.
    Last edited by PKer; 03-14-2003 at 04:40 PM.

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    Registered User Vostok 7's Avatar
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    Ah, lol, no problem.

    I don't know what -54 bar translates too, but that sounds really low considering 1.0 bar is roughly 14psi. Unless it's -.54 bar? But that sounds like too little vac to me, not sure though since I don't know how inHg relates to psi.

    Hm. Crazy measurements.

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    Moderator aussieinstlouis's Avatar
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    It may be -54cm of Hg (mercury).
    54cm = 21 inches

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    Registered User Hot_Dog's Avatar
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    I hold at about -0.6 bar at idle.
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    Registered User pityr's Avatar
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    That sounds about right. Thats about where mine idles at.
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    Registered User bdoug's Avatar
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    I'm about -.065 Mpa at warm idle
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  10. #9
    Registered User pityr's Avatar
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    Are you all measuring this with the windsheild defroster on? Since the AC is on when the defroster is on there will be a small load on the engine at idle and I have seen a small difference in turbo pressure when the AC is on vs when it is off.
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  11. #10
    Registered User KrillzSpec's Avatar
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    yeah, if i turn my steering wheel i get a little bit of boost, so when im at the track at the line, i violently shake my steeringwheel back and forth and get a great launch
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