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S3 Induction Noise - Whine/Whistle

Discussion in 'New A3/S3 (8V Chassis)' started by veeeight, May 7, 2014.

  1. veeeight

    veeeight I am a very pretty girl

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    S3 Owners:


    I have this noise, can't decide if its transmission noise, or induction noise, or turbo whistle.

    Comfort Mode

    4th gear, D4 or M4 (not S4)

    Accelerating reasonably briskly (1/2 to 3/4 throttle) - between 40 and 63 mph - do you get a whine/whistle ?


    Thanks :)
     
  2. Dylock

    Dylock Active Member

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    Sounds like the turbo, check to see how high your boost gauge is when it does it
     
  3. veeeight

    veeeight I am a very pretty girl

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    I thought Turbo - but I can't reproduce this whine/whistle in any other gear at the same revs :(
     
  4. Dylock

    Dylock Active Member

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    It won't about load it will be about load.

    It's hard to diagnose a sound without hearing it really.
     
  5. veeeight

    veeeight I am a very pretty girl

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    Does it do it in yours, or any other S3, thats what I'm asking, if you could try it out today?

    That would be great :)



    Comfort Mode

    4th gear, D4 or M4 (not S4)

    Accelerating reasonably briskly (1/2 to 3/4 throttle) - between 40 and 63 mph


    edit: It doesn't do the noise when the car is cold.
     
    #5 veeeight, May 8, 2014
    Last edited: May 8, 2014
  6. Dylock

    Dylock Active Member

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    I'll have a go. I have always thought that the turbo is quite noticeable in it.
     
  7. danilotto

    danilotto Active Member

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    veeeight! I know what are you speaking about. And this is not turbo. It is very different from turbo.

    It is a subtle sound like a brake pad that rubs against the disk? Is it audible also outside the car, is it constant and increase with the speed and not with the engine RPM? (so basically it remains steady also during gear shift). Does it fades away if you release the throttle?

    If the answer to all these questions is "yes". I have the same issue. It began after about 2000 km of life of the car.

    I took the car to the dealer yesterday and they were able to hear the noise (and this is a goal...). They made a try putting the car in N while riding, hope they did not damage the gearbox lol). They supposed that it is a transmission noise related to the S-Tronic clutches and they spoke about some "adjustment" that is possible to do on them, but they did not want to take action at the moment. (Because the noise is quite faint). And they told me to keep it monitored if it increases...

    edit: mine produces this noise also if cold, but it increases when warm.

    My suspicion is also on the Haldex clutches...

    What do you mean with "induction noise"?
     
    #7 danilotto, May 8, 2014
    Last edited: May 8, 2014
  8. veeeight

    veeeight I am a very pretty girl

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    Danilotto, I will experiment more this weekend to try and find where this noise is coming from.

    Induction noise = noise made by the air entering the intake! into the pipes etc.
     
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  9. danilotto

    danilotto Active Member

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    Very interesting. Please keep me updated! :music:
     
  10. veeeight

    veeeight I am a very pretty girl

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  11. Woody86

    Woody86 Active Member

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    I hear supercharger :huh: Strange noise though
     
  12. Flibble

    Flibble Active Member

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    Think I heard mine doing that earlier, dynamic mode, M4 about the speed you mentioned. Assumed it was turbo or induction noise.
     
  13. veeeight

    veeeight I am a very pretty girl

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    Can we have a play/listen next week Flibble?

    I'm sceptical it's turbo/induction, the mic was pretty close to the transmission tunnel :(

    But if someone elses S3 is doing it as well, it kinda reassures me!

    (In the old days, I would have called that alternator whine !)
     
  14. Flibble

    Flibble Active Member

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    I'm sure that can be arranged. :)
     
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  15. danilotto

    danilotto Active Member

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    Ok, it is different from the noise I was addressing to BUT, did you hear if it does come from the loudspeakers (the tweeters)? Because this is very similar to the typical whistle related to bad grounding of the audio amplifier. My S3 too produce this whistle. The strange thing is that the whistle is present also if the entertainment is switched off but I do not know if the amplifier switches off with the entertainment (as it should be) or with the ignition...
     
  16. veeeight

    veeeight I am a very pretty girl

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    ^ OK I went out in the car again with the recording equipment. The whine/whistle is definitely not coming from the loudspeakers.

    In the old days, I too would have described this as alternator whine, due to lack of suppression. But it's not that.


    Question is, is it transmission related, or boost related?
     
  17. danilotto

    danilotto Active Member

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    I think Audi could have the answer to your question. In case, let me know :)
     
  18. Flibble

    Flibble Active Member

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    Well we confirmed that mine definitely does it too. Sounds like transmission whine to me, might just be the way the 4th gear meshes makes it a bit noisier than other gears.
     
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  19. danilotto

    danilotto Active Member

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    I cannot understand if it must be considered a normal behavior of the car or a widespread fault or QC issues.
     
  20. danilotto

    danilotto Active Member

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    Hi, the whine veeight refers to is getting worse. Now when the car is warm after some kilometers on highway it is a constant whine in 6th gear from 120 to 140 km/h. Going faster I suspect it is still present but too high in pitch to be detected by the ears. In fact the pitch is related to engine revs. Tomorrow I will contact Audi.
     

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