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S3 Rear Diff noise

Discussion in 'A3/S3/Sportback (8P Chassis)' started by Brookie-S3, Aug 25, 2008.

  1. Brookie-S3
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    Brookie-S3 Member

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    [Aug 25, 2008]
    Hey all

    since i got the car ive heard a bit of rear diff noise and i think its getting worse.
    took it down to leeds audi where i used to work and went out with a tech who also heard it.

    if you do 75mph, and back off the throttle then on very lightly there is a whine there, rather annoying as this is mostly my crusing speed on the motorway

    its booked in on wed for them to check

    anyone else noticed this ?
    #1
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  3. richs2891
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    richs2891 I cant spell !

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    [Aug 25, 2008]
    Not noticed this but I would be very suprised if its the rear diff as I would have thought at 75mph its would be mostly fwd (unless hard accleration say through a bend) on a motorway.
    My money would either be on the exhaust moving on its mounts and causing a whine / rattle worse when taking left bends on its mounts (which mine had to recently go in for) or a rear bearing ?
    Would be interested to know the outcome

    Richard
    #2
  4. Splathead
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    Splathead Active Member VCDS Map User

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    [Aug 25, 2008]
    Yep, I've noticed a whine at exactly 75mph on a constant throttle in mine as well. Any faster or slower and it disappears. I noticed it the day that I picked it up. I just turn the stereo up or change speed.

    I'll be interested to know what you find out.
    #3
  5. Amchlolor
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    Amchlolor Active Member

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    [Aug 25, 2008]
    I'm confused by this statement.
    Surely the diff still works (i.e.its internal rotate), even if no drive is getting to it?
    The rear-wheel driveshafts must still rotate with the wheels, which means the differntial gears must rotate in the differential housing?
    Okay, they are just 'freewheeling', but they're still moving?
    So there is still a chance of noise?:shrug:
    #4
  6. Louay
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    Louay Well-Known Member

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    [Aug 25, 2008]
    I recently had an S3 and too noticed a rattle type noise at certain speeds, especially in 5th and 6th gear, between 4k rpm and 5 rpm, found out that it was the plastic nut that secures the spare wheel in place! could it be that?:shrug:
    #5
  7. Khufu
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    Khufu Active Member

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    [Aug 25, 2008]
    I agree, unless wheel spin, the front and back should rotate at the same speed. Maybe he means the noise only come on under load?
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  8. richs2891
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    richs2891 I cant spell !

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    [Aug 25, 2008]
    D'oh me been stupid - of course they are still rotating
    - If its doing it at a certain speed would suggest something out of balance much like wheels / tyres out of balance vibrating a certain speeds.
    Richard
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  9. Brookie-S3
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    Brookie-S3 Member

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    [Aug 25, 2008]
    i used to be a tech at leeds audi
    its nothing rattling round in car or the boot
    its not a wheel bearing as it does not increase with load around corners.
    the rear diff rotates the same speed as the front, its 4 wheel drive !

    its defo the rear diff at 75mph, only on very light throttle i can get it to play a tune if lift of throttle then back on lightly........

    not tyres out of balance
    #8
  10. JohnS3
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    JohnS3 Active Member

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    [Aug 26, 2008]
    Mine does this too, would like to hear how you get on though.
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  11. JohnS3
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    JohnS3 Active Member

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    [Sep 12, 2008]
    Bump. Any news??
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  12. SiT
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    SiT Member

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    [Sep 12, 2008]
    I get this also.

    For a little comparison, i used to get this on my MkV R32 which is a similar setup to the S3. I did find it more pronounced in the R to my current S3... but it is there all the same.
    #11
  13. S3OPES
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    S3OPES New Member

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    [May 18, 2009]
    I have this same problem but it does when i'm coming off the throttle from high revs. did you get it sorted. Or has anyone discovered the cause yet?
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  14. SiT
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    SiT Member

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    [May 19, 2009]
    Its still happening on mine too, although looking at my post from Sept last year, it IS now more pronounced then my R32..! It's been to the dealers a few times now, the last with Audi replacing my Propshaft.

    In Toby C's thread though looks like he has had Audi to replace his rear diff. My car needs a service imminently; I’ll push again when it's in as the propshaft hasn't cured it, in fact i now get it at around 70mph.
    #13
  15. tobycruse
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    tobycruse Member

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    [May 19, 2009]
    #14
  16. kinson
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    kinson Member

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    [Sep 21, 2013]
    Glad that I found this thread...
    I notice the clinging noise coming from the rear left recently. The noise appears when the gear is engaged and foot off the throttle. Noise disappeared gear is moved to "Neutral" (disengaged). I suspect this is something to do with the differential, instead of the wheel bearing, and after reading this thread, I'm more confident it is not the wheel bearing. The only thing is whether the rear differential refers to the Haldex unit? Is the whole Haldex unit required to be replaced?

    BTW, I'm driving a MY 2009 S3 Sportback (8PA).
    #15

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