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Audi s3 8l exhaust rattle from downpipe help?

Discussion in 'A3/S3 Forum (8L Chassis)' started by snowden952, Apr 4, 2014.

  1. snowden952
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    snowden952 Member

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    [Apr 4, 2014]
    I have recently fitted a relentless down pipe and decat and it has started to vibrate and rattle really loudly when I come off the accelerator any one know what could be causing this?
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  3. VAG-Slag
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    VAG-Slag Active Member

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    [Apr 4, 2014]
    I've heard a few of them have been knocking on the prop-shaft... What does clearance look like down there?
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  4. snowden952
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    snowden952 Member

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    [Apr 4, 2014]
    Not to sure ill have to have a look at it tomorrow as I'm at work now but its only come on since I properly supported it on the hanger before it was fine
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  5. Lavis89
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    Lavis89 Active Member

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    [Apr 4, 2014]
    Mine used to rattle a lot when I was pulling away, put on a powerflex bush on the dogbone mount, solved my problem
    #4
  6. snowden952
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    snowden952 Member

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    [Apr 4, 2014]
    I've just bought one will be here tomorrow thanks
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  7. Crazypete00
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    Crazypete00 Member

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    [Apr 15, 2014]
    did you sort the rattle out? think mine is doing it on the subframe. happens when im reversing and letting off, so guessing its when the engine moves forwards on its mounts
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  8. Chlippo
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    Chlippo Member

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    [Apr 15, 2014]
    I have exact same problem.

    I beleive powerflex (or any solid) engine mounts would reduce the engine movement and by doing so, reducing the chances of the downpipe knocking on anything next to it. The clearance is tight
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  9. kwistof
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    kwistof South East Events Moderator Regional Rep

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    [Apr 16, 2014]
    #8
    <tuffty/> likes this.
  10. Crazypete00
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    Crazypete00 Member

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    [Apr 16, 2014]
    thanks kwistof, i did do a seach last night and spent about an hour going through old threads.

    so loosening the engine mounts and pushing it over as far as it goes to the passengers side is worth a shot before replacing the mounts then.
    #9
  11. kwistof
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    kwistof South East Events Moderator Regional Rep

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    [Apr 16, 2014]
    No worries- I have pointed that thread to at least half a dozen people just in the past month tbh! lol

    That's definitely the first place to start, be it the cheapest/easiest/quickest option- as you can see in that thread that didn't work for me unfortunately but as soon as the engine mounts were replaced I haven't heard a knock/bang since and I give my car a good thrashing at times :)
    #10
  12. Crazypete00
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    Crazypete00 Member

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    [Apr 16, 2014]
    thanks again. if you know any mods that can possibly add little bits of info like this to the sticky's. there is a sticky about the xs power DP and cat so adding something like this on the end would be great.
    #11

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