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How to: N249 Bypass - AMK/BAM Engine

Discussion in 'A3/S3 Forum (8L Chassis)' started by BenJee_S3, Aug 28, 2013.

  1. BenJee_S3
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    BenJee_S3 Active Member

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    I Thought I'd do a little guide on the N249 bypass for the AMK and BAM engine which is different (and more simple) than the bypass on other engine codes.

    The AMK/BAM engines dont have an N112 valve, which means there's no need to cut and t-piece anything. It's as simple as putting silicon vacuum hose from the DV to the inlet.

    All that's needed is some 4mm internal diameter vacuum hose and new hose clips. I bought 2 meters on eBay for about 4 quid all in.

    So remove engine cover to expose the mess that is this:

    Vac chamber and N249 spaghetti junction...
    This is what we will be removing:

    [​IMG]

    So undo the bolts which attach the vac chamber to the metal bracket and release the valve from the catch.


    Follow the pipe to the dump valve and disconnect:

    [​IMG]

    [​IMG]

    Now remove the plastic cover down near the dipstick which is secured with 2 Phillips screws.
    This reveals a metal plate underneath which is removed with 2 Allen key bolts.

    Follow the vac pipe from the N249 down to the inlet and disconnect. This can be found on the left of the inlet manifold on the underside:
    Here:

    [​IMG]


    Dont forget to disconnect the electrical valve. Once disconnected pull out and keep aside:


    [​IMG]


    Once out the car, disconnect the piping to salvage the valve:

    [​IMG]

    Despite bypassing this valve, we still need to keep it electrically connect otherwise the ecu will throw up an error code.

    I re connected the valve and tucked it away behind some heat proof to hide it.

    Now disconnect the metal bracket which is bolted to the cam cover

    [​IMG]

    The bay should now look like this (ignore the fact my coils are out, I changed my plugs whilst I was at it)

    [​IMG]

    Now all that's left is to connect the dump valve to the inlet with the 4mm Vac hose. I used small cable ties to run the hose the route I wanted:

    [​IMG]

    And that's it! Re assemble the bracket near the inlet and the plastic cover and it should look like this:

    [​IMG]

    Since doing this my DV seems a bit more responsive, makes a slightly different noise and keeps the bay nice and neat!

    Hopefully this will help some fellow AMK/BAM owners as this was a lot easier than first thought.
    Last edited: Aug 28, 2013
    #1
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  2. <tuffty/>
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    <tuffty/> Badger 5 Edition Staff Member Moderator

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    Good work... added to stickies (as I live in hope someone will read them one day...) :)

    <tuffty/>
    #2
  3. shariain
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    shariain Well-Known Member

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    What is the benefit of removing this.
    #3
  4. <tuffty/>
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    <tuffty/> Badger 5 Edition Staff Member Moderator

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    Generally speaking it removes clutter, less pipes to rot and split and improves the response of the DV...

    The flip side is that the ECU loses a control feature for dumping boost if it feels it needs to... not a massive issue as the ECU also controls the throttle so can close that too...

    On higher power setups it serves no real purpose and is removed along with PCV deletes etc...

    <tuffty/>
    #4
  5. Alex C
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    Alex C Well-Known Member

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    nice pictures
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  6. epox
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    epox Active Member

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    nice, well done
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  7. ToonRing-G
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    ToonRing-G Audi Virgin

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    ahh good, nice to see a guide for the BAM engine, been meaning to do this but figuring it out from other guides was just confusing matters! i'll get some hose and get on it sometime soon :)
    #7
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  8. bigpapasmurf
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    bigpapasmurf Member

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    Great guide, something that Im going to have a shot at this weekend, and given Ive got an AMK this is prefect, thanks!
    #8
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  9. BenJee_S3
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    BenJee_S3 Active Member

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    How did you get on mate?
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  10. crispynz1
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    crispynz1 Member

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    Hey, just finished this on my BAM. Thank you very much!
    #10
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  11. JD09
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    JD09 I'm not modding, I'm improving

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    Would a slightly larger (5mm internal diameter) hose affect the function of this at all? I might do this tomorrow, so would only be able to buy from Halfrauds...
    #11
  12. <tuffty/>
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    <tuffty/> Badger 5 Edition Staff Member Moderator

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    Only if its too big for the relevant nipples... 5mm maybe a bit loose

    <tuffty/>
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  13. JD09
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    JD09 I'm not modding, I'm improving

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    Cheers chap. I might hunt around the shops to find some, failing that do it another time.
    #13
  14. dancuz
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    dancuz Member

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    Problem is you have decided you want to do it tomorrow, so it WILL happen! Once things are in my head. ..
    #14
  15. Freeman_1986
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    Freeman_1986 Member

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    just done this. dv sounds so much better, and bay looks a hell of a lot tidier :)
    #15
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  16. Tooks
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    Tooks Member

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    Will do this to mine over the weekend I think too.

    Thanks for the guide!

    I'm using 5mm silicone vac hose, will just nip the jubilee clips up a bit more!
    #16
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  17. daz-20vt
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    daz-20vt Well-Known Member

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    I fancy doing this today but can only get 5mm or 3.2mm vacuum hose. What would you guys suggest is better. And am i reading this right i need to fit it to the dv to the inlet manifold. Refit the valve . Nothing else? Just to clarify because im useless. Thanks
    #17
  18. rhys1210
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    rhys1210 Member

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    Great guide just done this to my S3 last week.
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  19. BenJee_S3
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    BenJee_S3 Active Member

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    I would go for 5 out of the 2, but ideally 4mm is best. I'm sure I got mine from eBay really cheap.

    Yep that's it mate, as long as its an AMK or BAM engine code that's all you need to do!
    #19
  20. daz-20vt
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    daz-20vt Well-Known Member

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    Ok ill get some ordered in 4mm. Id rather have it right. Thanks for the reply.
    #20
  21. Lavis89
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    Lavis89 Active Member

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    i used 4, everything fits quite snugly then, worthwhile mod for the hour or so it takes, cleans up the bay nicely
    #21
  22. Machine212
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    Machine212 Member

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    uploadfromtaptalk1390135573383.jpg did mine today due to a slight leak on one of the pipes on the valve. Sharpened up the dv dump noise no end. Before it was like pssshhhhhh. Now its PSTT.
    Thanks for the guide.
    #22
  23. Bennys3
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    Bennys3 Member

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    So you don't have too connect any vacuum pipes too the valve just the electrical connector and that's it?
    #23
  24. Machine212
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    Machine212 Member

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    That's right. One pipe from the underside of the manifold to the top of the dv.
    #24
  25. :: blade ::
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    :: blade :: Member

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    Got my pipe for this just need time to do it. washed the car instead :) so will do it next weekend if its nice
    #25
  26. Bennys3
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    Bennys3 Member

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    Just done this and the car won't start haha! Anybody else had this and can help?
    #26
  27. daz-20vt
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    daz-20vt Well-Known Member

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    Pics? Have you re connected all electrics?
    #27
  28. <tuffty/>
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    <tuffty/> Badger 5 Edition Staff Member Moderator

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    Fault codes?

    <tuffty/>
    #28
  29. Machine212
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    Machine212 Member

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    Did you reconnect the plug back into the bottom of the intake manifold? I almost forgot to do it.
    #29
  30. daz-20vt
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    daz-20vt Well-Known Member

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    Me to. this is what im thinking
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  31. Bennys3
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    Bennys3 Member

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    All plugs were plugged back in the pipe that's part of the PVC system has snapped! So it is taped up and cable tied until I can get 1 tomorrow it's the vacuums that go from the left side of the inlet it's the bottom pipe that has snapped going into another pipe?
    #31
  32. Bennys3
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    Bennys3 Member

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    It was this pipe that has went
    [​IMG]
    Anyone know where I can get 1?
    #32
  33. QuestMS
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    QuestMS Member

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    Either main dealer/TPS or do PCV delete and catch can mod would be the best bet I'm guessing
    #33
  34. dave5551
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    dave5551 Work in progress

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    Just done this to my s3 today was so easy following this thread well chuffed with the end result. image.jpg image.jpg
    #34
  35. david7m
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    david7m Member

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    I did mine the other week, how did you get on with attaching pipe to standard dv ?
    Mine didn't seem to work too well as I couldn't get the screw driver very low. Ended up with a cable tie on first as I could pull it tight, then hose clip that felt like it was being pushed of as I tightened it.
    Dave
    #35
  36. david7m
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    david7m Member

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    Just noticed your dv isn't standard, lol.
    Dave
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  37. fazer0
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    fazer0 Member

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    where has everyone hidden there n249, pics would be appreciated as i have not come up with many good places
    #37
  38. david7m
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    david7m Member

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    I had to put the mounting plate back on to the head because I wanted to put the cover back on, and the other tab has broken on the cover, so without it would have meant no cover support apart from at the front.
    Dave
    #38
  39. too hot
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    too hot Member

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    Looks a straightforward mod might give it a go next week after the Creiff run :ermm:
    #39
  40. TomoUK
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    TomoUK Member

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    Done yesterday, thanks for the 'how to' great help

    [​IMG]
    #40

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