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dump valve on my S3?

barlow S3 May 18, 2013

  1. barlow S3

    barlow S3 New Member

    Hi everyone

    i put a let off dump valve on my S3, replaced it where the normal one goes sounds **** but runs o.k.

    I then cut into my throttle body pipe and put it in there sounds mint but brings engine management light on and revs idle up and down

    Can anyone help me with where to put it so it sounds good?

  2. Reload

    Reload Bird is the Word!

    I'm assuming by sound you mean a dump to atmosphere type valve.

    VAG TFSi engines need a recirculating valve, they will no work well on atmospheric dump valves as the MAF will be throwing back false readings, hence the engine management light. Long term this could damage your engine as the car will constantly be running too lean or rich as it attempts to compensate for false air readings. In short, get a recirculating valve back on sharpish.

    I think forge do a form of blow off adapter which fits onto their recirculating valve but not sure. This could be what you need
  3. S3Alex

    S3Alex Rarely neutral Team Ibis TFSI Owners Group Gold Supporter Audi S3 DSG

    Hi...as Reload says,your car's ECU is now having trouble working out airflow,as you've introduced a great big leak into the system effectively.

    If you absolutely have to have something that makes noises,then this is what you need....

    Forge Motorsport | Alloy Fabrication

    Of course,now you need a new throttle body pipe,and you need to replace the Diverter Valve.

    Luckily Forge will sell you all of the bits you need...

    Forge Motorsport | Alloy Fabrication

    Forge Motorsport | Alloy Fabrication

    I know it sounds like lecturing,but you really should find out how a particular engine measures ariflow etc before chopping up the induction system.

    Oh...and I almost forgot...put the dump valve in the bin,before you damage your engine.
    Last edited: May 18, 2013
    Chilly, NHN and wuta3 like this.

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