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Your boost readings in what gear ??

Discussion in 'A4/S4 forum(B5 Chassis)' started by Bradderz_1988, Jul 10, 2011.

  1. Bradderz_1988
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    Bradderz_1988 Dont replace it, Upgrade it !!

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    [Jul 10, 2011]
    What peak boost are you seeing in your gears 1st -5th as I want to now if mine is correct.
    TQS owners prefrably.

    Cheers
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  3. Bradderz_1988
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    Bradderz_1988 Dont replace it, Upgrade it !!

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    [Jul 11, 2011]
    Mines as follows

    1st - 5-6psi
    2nd - 6-8psi
    3rd - 8-10psi
    4th and 5th - same as 3rd
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  4. B5QUAT
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    B5QUAT Member

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    [Jul 11, 2011]
    Not sure about first, as I tend to be quite mechanically symapthetic, but in the other gears mine his 12 psi dead which tails off to about 8-10 as the revs rise.

    In 5th it sometimes hits 14 but more often than not, it's bang on 12, angain tailing off as the revs go up.
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  5. Bradderz_1988
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    Bradderz_1988 Dont replace it, Upgrade it !!

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    [Jul 11, 2011]
    So looking at my readings there's something out of the ordinary then would you say ?
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  6. aragorn
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    aragorn "Stick a V8 in it!" Staff Member Moderator VCDS Map User

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    [Jul 11, 2011]
    Whats your airflow figures like on vagcom?

    AJL (and AEB) doesnt have a boost sensor. It works out the boost pressure using a load calculation based on the airflow, so if the MAF is a bit dodgy and reading incorrectly you can end up with squiffy boost. Your fuel trim values might also show something odd if its a MAF fault, and you did say you had a fault code about mixture, which again might point at the MAF.

    I dont have a gauge, but i've pulled a log thru second and the airflow figures show a nice flat torque curve ~170lb/ft which is the book figure, so would suggest that the car is making full boost in second gear.
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