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Turbo Back Pressure problem?

Discussion in 'A3/S3/Sportback (8P Chassis)' started by Jonay, Feb 4, 2011.

  1. Jonay
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    Jonay Member

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    [Feb 4, 2011]
    When accelerating, I've got a deep grumble/vibration that people has described as the quattro coupling/haldex doughnut as being past its date and needs replacing..

    however, it's now grown to be pretty constant (not just between 2000-3000rpm in 5th/6th gear about 60mph) and it only happens when on the throttle and when I lift off.

    ok scenario : driving along the carriageway at 50mph, I press down to accelerate and *grumble*.. i lift off (doesn't matter if clutch is engaged or not) and *grumble* when back on the throttle to maintain 50mph there's no noise..

    I'll try take a video if i can..


    N.B - I've also got a very very light whine (similar to distant sirens) when driving around town.
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  3. mike foster
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    mike foster Fossie VCDS Map User

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    [Feb 4, 2011]
    Whine is likely to be the turbo - they all do it. Unless it gets very bad (as mine just has !)don't worry too much.
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  4. Jonay
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    Jonay Member

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    [Feb 4, 2011]
    yeah its not the whine thats bothering me as i know most turbos do it..

    its the grumble thats worriying me!
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  5. antmax7
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    antmax7 Member

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    [Feb 4, 2011]
    i have the same grumble at between 2100 2300 rpm
    except for this my car drives great
    from what i have read its the haldex coupling that has seized
    mine is a 2.0t petrol by the way on a 55 plate with 38k on clock it has done this since i bought it when it was on 22k
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  6. Jonay
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    Jonay Member

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    [Feb 4, 2011]
    yeah its not the same grumble (i've got that aswell.. but this sounds different) I would understand why if it was under load from acceleration but why when i lift off?

    I'll try get a vid tomorrow if i get the chance :)

    btw cars over 127k+ miles and has been serviced. yesterday infact!
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  7. Jonay
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    Jonay Member

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    [Feb 5, 2011]
    anyone else got any ideas? I don't think I'll be able to get a video today, too busy!
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  8. antmax7
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    antmax7 Member

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    [Feb 5, 2011]
    mine is both when on or off the power in any gear well 3rd 4th 5th and 6th
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  9. NHN
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    NHN Retrofitter - Audi - VW - Skoda - Seat Site Sponsor VCDS Map User

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    [Feb 5, 2011]
    If its back pressure then it would maybe be a sign of a faulty cat & the pressure after a certain rpm is pushing something to allow pressure to release as such, speculative but not entirely impossible, you could try temporarily removing the cat & then test driving to see if the noise goes away, although dont know what other noises will then appear, as effectively unless you got a turbo back to put in place, then the gases would be to open air aswell as any noises as such, idea though, as I also have a noise at 2100 rpm, but running hybrid now so maybe time to swap for turbo back pipe.
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