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  1. #1
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    Idle boost reading

    Can someone confirm what is the normal idle vac reading? I am currently at -0.8 bar... Does this sound like I have a leak?
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  3. #2
    16Klappe's Avatar
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    Just checked, mine sits at -22PSI.
    I quite often say I'm going to do things.

    Then never do them.

  4. #3
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    Mine is -20
    350bhp & 316ftlb BBT new k16 7+7 blade hybrid turbo, Welly cooler, jetex filter, relentless ported v3 manifold 3" downpipe & de-cat, liquid gauge, r32 rear arb, AGU ported and polished Head, 550cc injectors, kw v2 Coilovers, s3dave tie bars & heat sheild, milltek cat back, I.E forged rods, brembos, inline fuel pump, v3 badger 5 tip, devils own WMI kit, AGU pistons, rear grooved discs & brembo pads, ds2500 pads & EBC ultimax disc, stack boost gauge

  5. #4
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    -0.8bar = -11.6 psi.. Sounds like something is wrong...
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  6. #5
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    I'm on -13.4. I've also been told i have a boost leak but then i've been told everything is fine? Confused.com
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    To be fair because it is making negative pressure it will be difficult to tell if and where the boost leak is, you will need to have it vacuum and pressure tested.
    I quite often say I'm going to do things.

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  8. #7
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    -20 until i drive it a bit then it goes to -25 when i stop

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  9. #8
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    You want around 19/20 inHg of vacuum, anything much lower would suggest a leak. Not measured in psi by the way, -20psi isn't possible.

  10. #9
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    A lot of guages show hg in vacuum not PSI. mine is around -14hg
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  11. #10
    S3 Paul's Avatar
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    I was beginning to think i had a problem... Mine has never seen -20 psi !
    I was told mine was "giving a good reading indicating no leaks or problems "
    I will check what it actualy reads later when i head out.
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  12. #11
    Westy's Avatar
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    I'm sure this subject has come up before and around -13-14hg was about right
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  13. #12
    S3 Paul's Avatar
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    I was thinking high 'teens
    Different when still on cold start too?
    Noggy Blue 2001 S3

    I ask questions because i change my mind so much. If i ask questions you have already covered... just leave it be?

  14. #13
    Westy's Avatar
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    This is mine on cold start then it drops a bit when warm:

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  15. #14
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    When mine starts (cold) it's 12 psi ish then when warmed it goes to 20 psi
    350bhp & 316ftlb BBT new k16 7+7 blade hybrid turbo, Welly cooler, jetex filter, relentless ported v3 manifold 3" downpipe & de-cat, liquid gauge, r32 rear arb, AGU ported and polished Head, 550cc injectors, kw v2 Coilovers, s3dave tie bars & heat sheild, milltek cat back, I.E forged rods, brembos, inline fuel pump, v3 badger 5 tip, devils own WMI kit, AGU pistons, rear grooved discs & brembo pads, ds2500 pads & EBC ultimax disc, stack boost gauge

  16. #15
    Sandip's Avatar
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    Mine is -20 in.Hg

    Looking at most boost gauges

    Vacuum - in.Hg

    Boost (positive pressure) - PSI
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  17. #16
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    It all depends on the calibration of the guages i mean pay 20 quid for a guage you are hardly going to have lab results.....
    Andy123 is correct, it is shown in HG not psi and all the forced induction cars ive had, it has always shown around the 20 in hg mark on idle, infact i used to use this as a tool if it went closer to 10 in hg, i new i had a leak somewhere, and sure enough there was one...

  18. #17
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    Mines around the 20 mark.
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  19. #18
    bez101's Avatar
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    -20hg

  20. #19
    S3 Paul's Avatar
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    Mine sits at about -18 once warm, Goes up ( or down ) to -22 on over run,
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