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  1. #1
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    Audi S3 8L N249 valve bypass - how to?

    Hi,
    Could someone help me bypass the N249 valve on an Audi S3, year 2001, 1.8T, 210 HP quattro, AMK engine?
    Bellow there`s a picture of the engine with the valve. Please explain, if possible using the picture, what do I have to do, witch hoses do I have to move. I've searched the web, but I haven't found a guide for this specific engine.
    Thank you!


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  3. #2
    Speedy Steve's Avatar
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    Disconnect the hose from the divertor valve nr rip out all the crap. leave the N249 connected with no hoses on and hide it down by the coil packs then just run a new hose from the bottom of the inlet manifold to the divertor valve
    Ive been Badger 5'd

    Can we break the magic 300?????? In a word Yes 314 BHP 249 lbft at Badger 5

    Quote Originally Posted by badger5 View Post
    steves is way quicker than any stock turbo'd s3 i have driven
    I only date skinny Women! They keep my power to weight higher...

  4. #3
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    8P A3 TDI - 220bhp - 335lbft
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  5. #4
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    What is the reason for doing this?

  6. #5
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    Read the link matey.

    It basically stops the ECU from being able to open the DV when on throttle which can reduce performance.
    8P A3 TDI - 220bhp - 335lbft
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  7. #6
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    and also eliminates the potential one million leaks you can get with the n249

  8. #7
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    Quote Originally Posted by Matt82 View Post
    and also eliminates the potential one million leaks you can get with the n249
    ...although he has introduced one by using a Forge Split-R ;P

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

  9. #8
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    one step forward, two...

  10. #9
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    So does everyone do this and is it worthwhile?

  11. #10
    Westy's Avatar
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    If you do a search I posted up some VAGCOM results where i was holding another 2 pound of boost due to this mod. I did before and after logs and it is definitely worth it. It also sharpens up the throttle response quite a bit.
    8P A3 TDI - 220bhp - 335lbft
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  12. #11
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    i did it because i couldnt be arsed to go over the n279 mess and check for leaks, and i could tell it gave the ECU control over my fun, started to rave about it on the board and it turns out everyone does it haha

  13. #12
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    I'm not modding, I'm improving

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    Is the N279 the gubbins that monitors air on cold start? Because if so I'm ripping this **** out as well.

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    i think youre thinking about the secondary air doo dah

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    N249 bypass definitely helped on mine. DV noise got alot louder too but that's with my BMC kit aswell.
    Inferi Black Cupra K1

    Click here for more Troo-Pics!


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    does it put extra strain on the turbo though? surely they wouldnt put the n249 in for no reason

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    same as above - wont this effect engine/turbo?

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    thanks

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    Me thinks I need to do this

  20. #19
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    its on my list too after the remap! i liiike the feedbacks

  21. #20
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    Did anyone actually read the link I posted above?

    It wont put any extra strain on the turbo as this mod doesn't increase boost. The N249 valve is controlled by the ECU and uses pressure stored in the vac reservoir (Black Box in the pic above) to open the DV if necessary as an engine safty feature. Reasons for the ECU to open the DV are:

    - Triggering of traction control. If you've got ESP and you've really tried to beans it through a roundabout in the wet you'll know what I mean. The ECU detects you're well out of shape, opens the DV and you feel the power and car bog down, nasty!

    - Boost spikes. The ECU can detect a spike or surge of boost and will open the DV to protect the engine but at the end of the day there are other devices in place to detect issues, such as ignition retardment, so nothing to worry about.

    In summary all old turbo cars with a DV opperate in this way (without the N249) and Audi just stuck the N249 syste on as an extra safety feature as they were releasing a 210/225 hatchback that would be driven by old ladies and mums doing the shopping.
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  22. #21
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    And where would the N112 valve be located on the engine from the first post picture? Under the vacum chamber? Because, if I got in right, I have to use the T piece, the right side goes to the BOV and the left one to the N112. Am I getting it right?
    Last edited by Luciano; 8th July 2010 at 14:45.

  23. #22
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    Quote Originally Posted by Luciano View Post
    And where would the N112 valve be located on the engine from the first post picture? Under the vacum chamber? Because, if I got in right, I have to use the T piece, the right side goes to the BOV and the left one to the N112. Am I getting it right?
    The N112 isn't in that pic, its underneath the plastic panel that holds the dipstick tube. You might not have the N112 valve as they weren't on the newer engines. Mine's a BAM and they didn't have them.

    So if you dont have the N112 all you need to do is use a 3/4mm joiner or get a new piece of silicone hose and plum together the DV hose to the one that goes to the front nipple of the inlet manifold, done.
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  24. #23
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    IIRC, your engine is AMK? and so doesnt have secondary air injection? So also doesent have the N112??
    Alex S3 AMK
    Bilstein B8s, H&R Springs, Neuspeed ARBs, Genuine 18" BBS LMs & LCR Brembos

  25. #24
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    Quote Originally Posted by Cookstein View Post
    IIRC, your engine is AMK? and so doesnt have secondary air injection? So also doesent have the N112??
    APY has the N112 valve, the AMK and BAM don't as they don't have SAI.
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  26. #25
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    Quote Originally Posted by Welly View Post
    APY has the N112 valve, the AMK and BAM don't as they don't have SAI.
    what car is the APY engine for?

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    Quote Originally Posted by Madeley View Post
    what car is the APY engine for?
    1999-2000 S3

  28. #27
    Madeley's Avatar
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    Thanks, l got a APY in mine! l keep reading about AMK,BAM, l thought l got the wrong engine in the old girl(2000 S3).

    Good luck in the world cup Stig.

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    Job done! It's true that my AMK engine doesn't have the N112 valve, so I' simply conected a 4mm silicon hose from the intake manifold to teh BOV. I left the N249 valve electricaly conected and...that's it!


  30. #29
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    hi luciano, you noticed a big difference?

  31. #30
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    what inside diameter silicon hose did you use mate and where did you get it? is it worth doing?

  32. #31
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    There is a difference, not spectacular, but you can feel it and the BOV sound is better...a little bit turbo lag reduced.
    The diameter of the silicon hose is 4 mm.
    This where you can get it. http://www.forgemotorsport.com/conte...product=FMVT4B
    Last edited by Luciano; 24th July 2010 at 11:30.

  33. #32
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    3mm id has always made a perfect seal on a vac nipple ime

  34. #33
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    Sorry for another question.

    Can i bypass this one mine. It's engine code AJQ ?
    Audi A3 Quattro Sport 180bhp

    Pic's comimng soon !

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    Thanks luciano, im doing this now >>>>> runs off to do this now lol
    2001 AMK S3, Black, Lowered, 18" RS4 Diamond cut and Black Polished Alloys

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    i just attempted this and ended up snapping the nipple under the manifold

    please please when doing this bypass, use a straight connector piece or something if you cant take the hose clamp off the manifold nipple, i wish i thought of that, now im stuck (see my post)
    2001 AMK S3, Black, Lowered, 18" RS4 Diamond cut and Black Polished Alloys

  37. #36
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    Just for clarification which is the better route to go down then 3 or 4mm id tubing?

    Edit: How much tubing is required roughly if replacing it all?
    Last edited by thorsy22; 26th July 2010 at 17:56. Reason: More questions, lol
    2001 Audi S3 - AMK 210bhp
    Tarox F2000 discs front - Tarox 401 Rallye+ pads
    Tarox F2000 discs rear - Tarox 112 Strada pads
    Goodridge brake lines
    TT pedals
    N249 bypass

    Finally back on the road, have a HUGE list of mods and things to do now!


  38. #37
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    Quote Originally Posted by thorsy22 View Post
    Just for clarification which is the better route to go down then 3 or 4mm id tubing?
    Either really, they are both a sufficiently good fit.
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    "Marriage is like a coffin and each kid is another nail."
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  39. #38
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    Quote Originally Posted by thorsy22 View Post
    Just for clarification which is the better route to go down then 3 or 4mm id tubing?

    Edit: How much tubing is required roughly if replacing it all?
    i got 3 meters and was plenty

  40. #39
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    Sweet cheers guys, for the sake of a tenner figured might as well replace all the tired old hoses.
    2001 Audi S3 - AMK 210bhp
    Tarox F2000 discs front - Tarox 401 Rallye+ pads
    Tarox F2000 discs rear - Tarox 112 Strada pads
    Goodridge brake lines
    TT pedals
    N249 bypass

    Finally back on the road, have a HUGE list of mods and things to do now!


  41. #40
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    Do I need jubilee clips it or are the push fit barbs/nipples sufficient?
    2001 Audi S3 - AMK 210bhp
    Tarox F2000 discs front - Tarox 401 Rallye+ pads
    Tarox F2000 discs rear - Tarox 112 Strada pads
    Goodridge brake lines
    TT pedals
    N249 bypass

    Finally back on the road, have a HUGE list of mods and things to do now!


 

 
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