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Thread: How to: N249 Bypass - AMK/BAM Engine

  1. #1
    BenJee_S3's Avatar
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    How to: N249 Bypass - AMK/BAM Engine

    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:



    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:





    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:




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





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



    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



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



    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:



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



    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 by BenJee_S3; 28th August 2013 at 23:00.
    Maz, Alex C, S321BAM and 2 others like this.

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  3. #2
    <tuffty/>'s Avatar
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    Good work... added to stickies (as I live in hope someone will read them one day...)

    <tuffty/>
    Silver 2001 AMK S3. Silver alcantara interior... now with added powarrrrrrrr, torques. VAGCOM + KII-USB. >> My build thread...

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    shariain's Avatar
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    What is the benefit of removing this.
    S3 1.8t Ming blue with ivory leather & 18"tt alloys

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    Quote Originally Posted by shariain View Post
    What is the benefit of removing this.
    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/>
    Silver 2001 AMK S3. Silver alcantara interior... now with added powarrrrrrrr, torques. VAGCOM + KII-USB. >> My build thread...

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    Alex C's Avatar
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    nice pictures
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    nice, well done
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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
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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!
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    Quote Originally Posted by bigpapasmurf View Post
    Great guide, something that Im going to have a shot at this weekend, and given Ive got an AMK this is prefect, thanks!
    How did you get on mate?
    250 BHP - 300 Ft/Lbs Torque
    Miltek Resonated Cat Back, De-Cat, Turbo Dynamics DV, Badger 5 TIP, S2000 Filter, N249 Bypass, FMIC, Ported Head, JabbaSport Custom Remap

  11. #10
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    Hey, just finished this on my BAM. Thank you very much!
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  12. #11
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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...

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    Quote Originally Posted by JD09 View Post
    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...
    Only if its too big for the relevant nipples... 5mm maybe a bit loose

    <tuffty/>
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    Silver 2001 AMK S3. Silver alcantara interior... now with added powarrrrrrrr, torques. VAGCOM + KII-USB. >> My build thread...

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    Quote Originally Posted by <tuffty/> View Post
    Only if its too big for the relevant nipples... 5mm maybe a bit loose

    <tuffty/>
    Cheers chap. I might hunt around the shops to find some, failing that do it another time.

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    Quote Originally Posted by JD09 View Post
    Cheers chap. I might hunt around the shops to find some, failing that do it another time.
    Problem is you have decided you want to do it tomorrow, so it WILL happen! Once things are in my head. ..
    2001 AMK S3 in Goodwood Green

  16. #15
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    just done this. dv sounds so much better, and bay looks a hell of a lot tidier
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    S3 AMK (AKA FUTURE CLASSIC )

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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!
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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

  19. #18
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    Great guide just done this to my S3 last week.
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    2003 S3 BAM 225 Dolphin grey, Silk Nappa Leather, Bose, Cruise control.

    Mods; custom code stage 1, S3 8P gear knob, pipercross panel filter, APR diverter valve, Forge TIP, Powerflex bushes, R32 rear anti roll bar, spacers F 15mm R 20mm, haldex race controller, Bilstein b12 pro kit, Porsche 996 turbo brakes.

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    Quote Originally Posted by daz-20vt View Post
    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
    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!
    250 BHP - 300 Ft/Lbs Torque
    Miltek Resonated Cat Back, De-Cat, Turbo Dynamics DV, Badger 5 TIP, S2000 Filter, N249 Bypass, FMIC, Ported Head, JabbaSport Custom Remap

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    Quote Originally Posted by BenJee_S3 View Post
    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!

    Ok ill get some ordered in 4mm. Id rather have it right. Thanks for the reply.

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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
    2001 1.8T Quattro Sport 89k covered ARY engine.
    Remapped at Badger 5, 213bhp - 235lb/ft torque.
    HS2K cone, FMDV008, Silicon TIP, 18" RS4 (reps), AP coilovers, Catch can, n249 bypass, Vent pod boost gauge, Toyosport 3" Downpipe/Decat, S3 Front brakes, Polyflexed Dogbone, S3dave (RIP) adjustable tie bars, FMIC

    Soon to be done: SAI delete, 3" Catback, Stage 2 remap

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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.

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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?

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    Quote Originally Posted by Bennys3 View Post
    So you don't have too connect any vacuum pipes too the valve just the electrical connector and that's it?
    That's right. One pipe from the underside of the manifold to the top of the dv.

  26. #25
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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

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    Just done this and the car won't start haha! Anybody else had this and can help?

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    Pics? Have you re connected all electrics?

  29. #28
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    Quote Originally Posted by Bennys3 View Post
    Just done this and the car won't start haha! Anybody else had this and can help?
    Fault codes?

    <tuffty/>
    Silver 2001 AMK S3. Silver alcantara interior... now with added powarrrrrrrr, torques. VAGCOM + KII-USB. >> My build thread...

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    Did you reconnect the plug back into the bottom of the intake manifold? I almost forgot to do it.

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    Quote Originally Posted by Machine212 View Post
    Did you reconnect the plug back into the bottom of the intake manifold? I almost forgot to do it.
    Me to. this is what im thinking

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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?

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    It was this pipe that has went

    Anyone know where I can get 1?

  34. #33
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    Either main dealer/TPS or do PCV delete and catch can mod would be the best bet I'm guessing
    Relentless v3 manifold, custom 3" decat downpipe, custom 2.5" exhaust system, Forge wastegate actuator, Forge 007p DV, Badger5 3" TIP, ITG Maxogen filter, Draft44 catch can, Trackslag charge pipe, 2.0TFSI coil packs, n249 delete, FMIC, poly bushed, FK coilovers, adjustable rear arms, 19" RS4 style alloys,

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

  36. #35
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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
    2001 S3 | 210/256/270 switchable APR software | Absolute Red |

  37. #36
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    Just noticed your dv isn't standard, lol.
    Dave
    2001 S3 | 210/256/270 switchable APR software | Absolute Red |

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    where has everyone hidden there n249, pics would be appreciated as i have not come up with many good places

  39. #38
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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
    2001 S3 | 210/256/270 switchable APR software | Absolute Red |

  40. #39
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    Looks a straightforward mod might give it a go next week after the Creiff run
    2002 Nogaro Blue S3

  41. #40
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    Done yesterday, thanks for the 'how to' great help

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