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Question for those who have bypassed the N249 valve

Discussion in 'A3/S3 Forum (8L Chassis)' started by Jay, May 17, 2009.

  1. Jay
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    Jay Member

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    [May 17, 2009]
    I did this 'mod' a few weeks ago and recently started to hear chatter when coming off boost. I've got the 007p fitted so knew it couldn't be that. Had a look under the cover and found the heat had caused the vacuum pipe to fold onto itself where it comes out of the top of the DV. Managed to sort the problem out but looking to get some better quality tubing. I'm using 4mm at the moment and was wondering what difference 3mm would make, if any?

    What size have people used when doing this mod?
    #1
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  3. Jay
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    Jay Member

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  4. 666markyboy
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    666markyboy Well-Known Member

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    [May 18, 2009]
    What is gained by bypassing this valve ??? i've not heard of this mod before.... and where is it located ???
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  5. Jay
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    Jay Member

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  6. Tastyterrier
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    Tastyterrier Monkey Trainer

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    [May 18, 2009]
    I've used 5mm proper silicone tubing as a temp fix for a faulty N249. Sorted the problem straight away, however the N249 is a safety system against overboost, so I'll be replacing it and then getting the N75J back on:o.k:
    #5
  7. Jay
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    Jay Member

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    [May 18, 2009]
    I was thinking maybe a smaller tube would give better throttle response?
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