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S3 - flap in exhaust tail pipe?

Discussion in 'A3/S3/Sportback (8P Chassis)' started by ved789, Nov 22, 2009.

  1. ved789
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    ved789 Member

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    [Nov 22, 2009]
    Hi,

    Please can someone explain to me how the flap in the exhaust works (solenoid driven), and its purpose ?

    Thanks
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  3. Staz
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    Staz is a retronaut Staff Member Moderator VCDS Map User

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    [Nov 22, 2009]
    It's controlled by the ECU I think. It's there to reduce noise at low revs.
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  4. ved789
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    ved789 Member

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    [Nov 25, 2009]
    thanks
    Does anyone have any further technical information as to how it works?
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  5. Staz
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    Staz is a retronaut Staff Member Moderator VCDS Map User

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    [Nov 25, 2009]
    Can I ask why you want to know?
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  6. ved789
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    ved789 Member

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    [Nov 25, 2009]
    Staz, as per this thread: http://www.audi-sport.net/vb/showthread.php?t=82565 , which you also replied to, I am still trying to work out why my exhaust has gone as quiet as it has gone now.

    I logged it again, and I found that the waste gate duty cycle had changed a bit. I suspected a leak, and lo and behold, I found that a silicon pipe going to the Forge DV was torn.

    This however did not sort out the issue on the sound of the car.
    Another way to explain what the car is doing, is that there is a lack of back pressure in the system. I do not have that "gush" out of the exhaust anymore.

    Hence, I was wondering how that solenoid works i.e when it is open/closed ? What activates the solenoid, etc.

    Thanks
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  7. Boydie
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    Boydie Boycie VCDS Map User

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    [Nov 25, 2009]
    Take the pipe off the valve, seal it and hold the flap open :)

    Did it in mine before I got the milltek
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  8. Staz
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    Staz is a retronaut Staff Member Moderator VCDS Map User

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    [Nov 25, 2009]
    Aha I remember now. I don't know how the lever is controlled mate but it's probably worth modding it just in case:

    http://www.audi-sport.net/vb/showthread.php?t=64998
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