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  1. #1
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    S3 - flap in exhaust tail pipe?

    Hi,

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

    Thanks
    2010 Audi S4 (S-Tronic)
    2010 Audi S3 (Sportback, S-Tronic)

    ex cars :

    2007 Audi S3
    2007 Audi TT (S-Tronic)
    2006 Audi A3 2.0T

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  3. #2
    Staz's Avatar
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    It's controlled by the ECU I think. It's there to reduce noise at low revs.
    8P2 S3

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

  4. #3
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    thanks
    Does anyone have any further technical information as to how it works?
    2010 Audi S4 (S-Tronic)
    2010 Audi S3 (Sportback, S-Tronic)

    ex cars :

    2007 Audi S3
    2007 Audi TT (S-Tronic)
    2006 Audi A3 2.0T

  5. #4
    Staz's Avatar
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    Can I ask why you want to know?
    8P2 S3

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

  6. #5
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    Quote Originally Posted by Staz View Post
    Can I ask why you want to know?
    Staz, as per this thread: S3 with downpipe - exhaust note changed , 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
    2010 Audi S4 (S-Tronic)
    2010 Audi S3 (Sportback, S-Tronic)

    ex cars :

    2007 Audi S3
    2007 Audi TT (S-Tronic)
    2006 Audi A3 2.0T

  7. #6
    Boydie's Avatar
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    Take the pipe off the valve, seal it and hold the flap open

    Did it in mine before I got the milltek

  8. #7
    Staz's Avatar
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    Quote Originally Posted by ved789 View Post
    Staz, as per this thread: S3 with downpipe - exhaust note changed , 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
    Aha I remember now. I don't know how the lever is controlled mate but it's probably worth modding it just in case:

    How to: S3 exhaust flap mod
    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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