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question about psi

Discussion in 'A3/S3 Forum (8L Chassis)' started by E4 FENN, Nov 23, 2010.

  1. E4 FENN
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    E4 FENN mr fenn

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    [Nov 23, 2010]
    hello all =) had a new turbo k03s under boost there is some lag,boost gauge reads -19 on tick over and on boost over 20psi as it only goes to 20 on the dial??? it was around 17psi the old k03s turbo...confused ...maybe i shud get a dyno and tuning re-done?
    #1
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  3. DaveA3
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    DaveA3 Audi A-Trizzle!

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    [Nov 24, 2010]
    maybe the old turbo had a weak actuator n you was losing a bit of boost. and when they mapped it they mapped it to what they thought was 17 psi. but with a new actuator it is actually 20 psi. probably needs tweaking mate
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  4. Welly
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    Welly VX220 SC Driver :)

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    [Nov 24, 2010]
    K03S is a more efficient turbo at the end of the day.

    A map to suit the addition of the K03S would help.
    #3
  5. DaveA3
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    DaveA3 Audi A-Trizzle!

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    [Nov 24, 2010]
    he mentioned his new k03s was replacing his old k03s though wellington
    #4
  6. Welly
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    Welly VX220 SC Driver :)

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    [Nov 24, 2010]
    Hmmm, I always found reading things properly helps....

    lol

    To be fair, if it's mapped for a K03S engine anyway, I wouldn't worry too much. The map will be expecting those boost levels if that's what it's producing.

    I'd bet money that the old turbo wasn't making the boost the map was requesting.
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  7. DaveA3
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    DaveA3 Audi A-Trizzle!

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    [Nov 24, 2010]
    :p and yeh that makes more sense. the vacuum is bang on aswell at -19 i believe
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  8. E4 FENN
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    E4 FENN mr fenn

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    [Nov 24, 2010]
    hopefully all good then,=)i will dyno it at weekend probs....it was in the 220s-230bhp...its been mapped and everything..hopefully a tune up will sort it...cheers fellas!
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  9. DaveA3
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    DaveA3 Audi A-Trizzle!

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    [Nov 25, 2010]
    cool let us know how u get on!
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  10. AWDMk1
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    AWDMk1 Member

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    [Nov 25, 2010]
    Is -19 on tickover really correct.....????

    My remapped S3 has a turbo timer which typically shows -0.67 bar on tickover (10psi ish) and maxes out at just over 1.6 bar (24psi ish) bar on full boost????

    Confused!
    #9
  11. DaveA3
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    DaveA3 Audi A-Trizzle!

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    [Nov 25, 2010]
    on all threads ive found its supposed to be -18 to -20
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  12. s3dave
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    s3dave TFSI Hybrid

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    [Nov 25, 2010]
    All the turbo,d cars ive had have been -20 in hg
    my liquid shows -13 but that is a software issue i believe.... need to put my A pillar stack gauges on...:sly:
    #11
  13. AWDMk1
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    AWDMk1 Member

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    [Nov 25, 2010]
    -20 HG???? Isn't 1 HG 0.5 PSI (ish) in which case -20 HG = -10 PSI which is about what I am getting at - 0.67 Bar.

    Gotta love all these different means of measuring pressure!!! :)
    #12
  14. s3dave
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    s3dave TFSI Hybrid

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    [Nov 25, 2010]
    in.hg (inches of mercury)
    measures negative pressure, psi or bar measures positive pressure....
    there is also mm hg (mm of mercury ) for negative pressure to confuse further...:faint: :think:
    Last edited: Nov 25, 2010
    #13
  15. DaveA3
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    DaveA3 Audi A-Trizzle!

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    [Nov 26, 2010]
    yeh sorry -18hg to -20hg
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