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  1. #1
    Staz's Avatar
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    Post How to: S3 exhaust flap mod

    Recy G sent me the link to the old thread about this mod:

    Exhaust Mod

    I knew nothing about it as I was away at the time but I thought I'd give it a go, so here it is.

    You will need:

    1x flat head screwdriver
    1x pliers
    about 50cm of thin locking-wire

    So here is the lever which moves the flap:



    And here is the flap inside the left pipe:



    Firstly you will need to use the screwdriver to pop the lever out of the hole in the actuator arm so it looks like this:



    As was pointed out by siu00adg (post #73) if you leave it like that the flap could quite easily close itself. More than likely the flap would turn around completely and end up about 170 degrees from the closed position (i.e. the flap nearly closed but facing the opposite way) and stay there.

    Not only this but the lever arm sits just where you would like the actuator arm to sit and would still be moving as normal so would push the actuator arm out of position.

    I decided I would use some .457mm locking wire to tackle the issue (I only had 2 sizes in the locker and the other was too thick):



    I tried a couple of ways of routing the wire to hold the actuator arm in place but this is how it ended up:



    I started by wrapping the wire through the hole in the arm a couple of times. I then put in a few twists to keep the wire secure. Then I looped both ends around the mount from the front to the back and then tied them off together against the first section of wire.

    You may find a better way to do this but the idea is there.

    The flap position is not perfectly flat but I would have thought it's free flowing enough anyway:



    I have not had a proper drive to try it out yet, only drove back from the workshop to my room, 1/2 mile at 20mph limit. I will be going out later to get some food so I will post results then.
    8P2 S3

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  3. #2
    VRStu's Avatar
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    Interested to know how you get on with this.
    Stu.

    A4 3.0 TDi S-Line Quattro, 7 Speed S-Tronic, Quartz Grey, 19" Twin Spoke Alloys, Alcantara with Silver Stitching & Heating, Nav High, B & O, AMI, DAB, Parking Advanced & Rear View Camera, Advanced Keyless Entry, LED Interior Light Pack, Hill Hold Assist, Heated Electric Folding Mirrors, Through Load.

    Previous MY11 S3 Sportback Black Edition, S-Tronic, Ibis White.

  4. #3
    Khufu's Avatar
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    what's the issue with the flap? What does it do? Is it like the EXup valve on Yamaha motorbikes?
    2003-2008 1998 Red A3 8L 1.8 Sport
    2008 -> 2003 Akoya Silver A3 8P1 2.0 FSi Sport

  5. #4
    Staz's Avatar
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    Well I'm back now, and I can't say I noticed any difference!

    Maybe a bit more popping on the overrun but that's it.
    8P2 S3

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  6. #5
    FazS3's Avatar
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    Go out for a real blast then report back fella :P
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  7. #6
    Recy G's Avatar
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    Have got the NSN for that lock wire please Staz. Haha

  8. #7
    VRStu's Avatar
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    Quote Originally Posted by Recy G View Post
    Have got the NSN for that lock wire please Staz. Haha
    ............ and the wire locking tool !!!
    Stu.

    A4 3.0 TDi S-Line Quattro, 7 Speed S-Tronic, Quartz Grey, 19" Twin Spoke Alloys, Alcantara with Silver Stitching & Heating, Nav High, B & O, AMI, DAB, Parking Advanced & Rear View Camera, Advanced Keyless Entry, LED Interior Light Pack, Hill Hold Assist, Heated Electric Folding Mirrors, Through Load.

    Previous MY11 S3 Sportback Black Edition, S-Tronic, Ibis White.

  9. #8
    Staz's Avatar
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    Quote Originally Posted by Recy G View Post
    Have got the NSN for that lock wire please Staz. Haha
    Lol you can have as much as you want when you come down mate!

    Quote Originally Posted by VRStu View Post
    ............ and the wire locking tool !!!
    It's so thin you don't need the tool. Or maybe that's because of my massive finger strength
    8P2 S3

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  10. #9
    JohnS3's Avatar
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    Quote Originally Posted by staz1000 View Post
    Or maybe that's because of my massive finger strength
    and that' s another story....


  11. #10
    hatmeow's Avatar
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    I guess this flap does will not exist if the exhaust was replaced with an aftermarket exhaust? What does this flap do anyways? Put up the back pressure during low RPM?
    A3 2.0T Sportback DSG.

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  12. #11
    Staz's Avatar
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    Quote Originally Posted by JohnS3 View Post
    and that' s another story....
    It certainly is!

    Quote Originally Posted by hatmeow View Post
    I guess this flap does will not exist if the exhaust was replaced with an aftermarket exhaust? What does this flap do anyways? Put up the back pressure during low RPM?
    It won't be on an aftermarket no. I don't know what it does tbh. I don't know when it opens and closes but why would you want back pressure anyway? I thought back pressure was a bad thing as it retards power!
    8P2 S3

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  13. #12
    JohnS3's Avatar
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    Quote Originally Posted by hatmeow View Post
    What does this flap do anyways? Put up the back pressure during low RPM?
    I thought it was to make the exhaust quiet at low revs and make more noise at high revs. Could be wrong though....


  14. #13
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    Quote Originally Posted by staz1000 View Post
    It won't be on an aftermarket no. I don't know what it does tbh. I don't know when it opens and closes but why would you want back pressure anyway? I thought back pressure was a bad thing as it retards power!

    correct, the ideal situation on a turbo car is no back pressure at all hence 3" systems

  15. #14
    R8GGA

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    Quote Originally Posted by staz1000 View Post
    It certainly is!


    I don't know what it does tbh. I don't know when it opens and closes but why would you want back pressure anyway? I thought back pressure was a bad thing as it retards power!
    It's a drive-by noise EU regulation thing. Up to 3500 rpm; it keeps one side shut so the exhaust makes less noise; over 3500rpm the flap opens and the exhaust is slightly louder.

    Even my MGTF had one which I also overrode. (Oh dear yes I did just admit to having one of those at one point)
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  16. #15
    Staz's Avatar
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    Quote Originally Posted by magnus911 View Post
    It's a drive-by noise EU regulation thing. Up to 3500 rpm; it keeps one side shut so the exhaust makes less noise; over 3500rpm the flap opens and the exhaust is slightly louder.
    I see! I was listening out for extra noise at higher revs. Can't say I noticed a difference lower down either.
    8P2 S3

    For advice on Air Con problems please read my FAQs.
    To find ASN members with VCDS check out the MAP.

 

 

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