Monster MotorsportEM Tuning
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  1. #1
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    Question Strange knock on lift-off since Evoms fitted (video)

    As per the title, i've just fitted an Evoms v-flow to my S3 today and now i'm noticing a single knock noise when I lift off the throttle and the revs drop. It seems to occur roughly as the revs drop below 1000 rpm. You should be able to hear it in this video:

    Audi S3 8P lift-off knock - YouTube

    Anybody got a clue as to what might be causing that?
    '07 Phantom Black S3

    Superchips Bluefin Stage 1
    TTRS FBMFSW
    MY11 Rear Lights
    Auto-lights/Auto-Wipers/Auto-dimming rear view mirror/CHLH retrofit

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  3. #2
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    Hmm... not a clue really. Sounds like something closing as the revs drop, maybe cam related? Afraid you'll need someone more mechanical to get their head under bonnet, unless it's something common and someone else already knows what it is.
    Hunt is over

    1st Audi - 2001 Ming Blue 8L S3 210
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  4. #3
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    Thanks. Yeah I really can't put my finger on it. Wonder if it's always been there and the new intake has just highlighted it.
    '07 Phantom Black S3

    Superchips Bluefin Stage 1
    TTRS FBMFSW
    MY11 Rear Lights
    Auto-lights/Auto-Wipers/Auto-dimming rear view mirror/CHLH retrofit

  5. #4
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    Might just be something you'd only notice with the bonnet open so, like you say, you just hadn't heard it before.
    Hunt is over

    1st Audi - 2001 Ming Blue 8L S3 210
    2nd Audi - 2008 Black 8P2 S3 3dr
    and now - 2007 Daytona Grey B7 RS4 saloon

  6. #5
    DeckedS3's Avatar
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    Did you install the heat sheild?
    If so, that may be hitting the back of the engine bay.... Cant watch the vid as i'm at work.

    Meteor S3, APR Stage 3, APR HPFP, Milltek TBE, LOBA/Sach's Clutch, Bilstein PSS10's, H&R ARB, Gen4 Haldex PP, EVOM's DV & CAI, Forge TB with Pro-Alloy IC, BBS CK 19" My S3

  7. #6
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    No I don't have the heat shield.
    '07 Phantom Black S3

    Superchips Bluefin Stage 1
    TTRS FBMFSW
    MY11 Rear Lights
    Auto-lights/Auto-Wipers/Auto-dimming rear view mirror/CHLH retrofit

  8. #7
    DeckedS3's Avatar
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    Just has a listen and it doesn't sound like anything mine does..... Weird!

    Meteor S3, APR Stage 3, APR HPFP, Milltek TBE, LOBA/Sach's Clutch, Bilstein PSS10's, H&R ARB, Gen4 Haldex PP, EVOM's DV & CAI, Forge TB with Pro-Alloy IC, BBS CK 19" My S3

  9. #8
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    Hmmm, this has got me quite worried. Tempted to take the Evoms off and put the stock filter back on to see if I can still hear it. I just can't see why the Evoms would cause anything like that unless it was physically knocking against something. I can't see it moving much but it's difficult to have much of a look under the bonnet when you need to blip the throttle as well.
    '07 Phantom Black S3

    Superchips Bluefin Stage 1
    TTRS FBMFSW
    MY11 Rear Lights
    Auto-lights/Auto-Wipers/Auto-dimming rear view mirror/CHLH retrofit

  10. #9
    Denty's Avatar
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    Cool

    Quote Originally Posted by ADi Nuff Valves View Post
    Hmmm, this has got me quite worried. Tempted to take the Evoms off and put the stock filter back on to see if I can still hear it. I just can't see why the Evoms would cause anything like that unless it was physically knocking against something. I can't see it moving much but it's difficult to have much of a look under the bonnet when you need to blip the throttle as well.

    ive got this on my s3 and it had me a bit worried untill i figured it out.... try pinching the Diverter Valve to Intake Return Hose

    with some mole grips or the like and then blip ur engine.... i bet the knocking sound wont be there anymore... solution - fit an forge uprated silicon pipe to prevent deformation caused by the extra airflow that ur new intake causes......



    i thank ya
    08 S3: Phtm Blk Prl, 330+bhp, Evolve Remap, Forge Twintake, Sachs Organic Clutch, Forge Short Shift, 19" 2010 TTS Parallel split 5 spoke alloys, MY11 lights, RNSE Nav, Bose, 6 cd, Arm rest, Buckets, FBMFSW, phoneprep, Adaptive Lights, Black inlays

    MK1 golf swallowtail project
    : 20v turbo BAM / AGU engine, Haldex 4x4 conversion - work in progress... its gonna be a beast -

  11. #10
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    Quote Originally Posted by Denty View Post
    ive got this on my s3 and it had me a bit worried untill i figured it out.... try pinching the Diverter Valve to Intake Return Hose

    with some mole grips or the like and then blip ur engine.... i bet the knocking sound wont be there anymore... solution - fit an forge uprated silicon pipe to prevent deformation caused by the extra airflow that ur new intake causes......



    i thank ya
    Really? Wouldn't you see the pipe deforming if it was? Is this the correct pipe i've highlighted below?

    pipe.jpg

    The noise seemed to be coming from around the cone filter, maybe below it. Anyway, i've put the stock filter back on for now to check the noise isn't still there and it didn't appear to be.

    Didn't realise Forge did a replacement pipe. Might be worth a try i guess. Got any links?
    '07 Phantom Black S3

    Superchips Bluefin Stage 1
    TTRS FBMFSW
    MY11 Rear Lights
    Auto-lights/Auto-Wipers/Auto-dimming rear view mirror/CHLH retrofit

  12. #11
    Denty's Avatar
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    thats the one mate...you cant see it by eye deforming..... try fitting the new version diverter valve from audi at the same time as fitting the pipe - the noise should go :-)


    Forge Motorsport FMRLH Diverter Valve to Intake Return Hose S3 8P / S3 8P Sportback 2.0T FSi Quattro 11/06> - £49.10 : The premier online mail order VAG suspension and performance specialists. We offer a wide range of all the best branded suspension
    08 S3: Phtm Blk Prl, 330+bhp, Evolve Remap, Forge Twintake, Sachs Organic Clutch, Forge Short Shift, 19" 2010 TTS Parallel split 5 spoke alloys, MY11 lights, RNSE Nav, Bose, 6 cd, Arm rest, Buckets, FBMFSW, phoneprep, Adaptive Lights, Black inlays

    MK1 golf swallowtail project
    : 20v turbo BAM / AGU engine, Haldex 4x4 conversion - work in progress... its gonna be a beast -

  13. #12
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    Mine makes the EXACT same sound and I've not noticed any issues relating to it.

    Current: 2010 Audi S3 Sportback S-tronic
    Ex: 2007 Audi A3 Sportback - 2.0T DSG
    Ex: 2008 Opel Corsa OPC
    Ex: 2004 Opel Corsa Lite
    Ex: 1978 VW Beetle

  14. #13
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    I've got the new rev D diverter. Thanks for the link. £50 for some pipe seems a tad steep!

    Cheers Acheron. I've taken the kit off for the time being but I might have to put it back on if I know it won't cause any issues.
    '07 Phantom Black S3

    Superchips Bluefin Stage 1
    TTRS FBMFSW
    MY11 Rear Lights
    Auto-lights/Auto-Wipers/Auto-dimming rear view mirror/CHLH retrofit

 

 

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