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N249 BYPASS YES OR NO???

paulsaudi Jun 24, 2011

  1. paulsaudi

    paulsaudi Member

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    Hi,

    I have 2001 AMK S3

    Should i do the N249 bypass??? is it much better/smoother etc??

    Ive heard it messes with the traction control??

    My friend also has S3 and he said that the traction has saved him many many times!!!!

    Will traction still work with this mod??

    Also just to clear it up, to do the mod just run 4mm hose from inlet all the way to the top of factory DV and leave N249 plugged in to stop dash lights etc?

    you opinions please............
     
  2. dplovin

    dplovin Member

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    ive done the bypass mate never had any problems witn traction or anything for that matter, car felt a little more responsive and got rid of a boost leak, clears up alot of mess aswell all that vac chamber and stuff. theres one or two guides on here how to do it.
     
  3. Syvo

    Syvo IF IN DOUBT GO FLAT OUT

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    good idea to remove results in less boost leaks.
    also the traction will not be affected.
    yeh just 4mm vac hose
    leave n249 connected electrically
    run pipe form top of dv tee into inlet manifold run the rest of pipe to the n112
    run a second pipe from other side of n112 to sai
    job done
     
  4. Blackcupraa

    Blackcupraa Member Team Ibis VCDS Map User Audi S3 Manual

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    Easiest job in the world to do and the throttle feels more connected to the engine afterwards. Well worthwile for a quids worth of pipe.
     
  5. Sandip

    Sandip Well-Known Member Team Nogaro Blue

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    No SAI on AMK's lol :)
     
  6. SiGainey

    SiGainey Member

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    I'm a believer in leaving it as Audi designed it but did the n249 delete last weekend and it's definitely all positive... On an AMK as it happens...
     
  7. G60DAN

    G60DAN Member

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    I have an AMK it's so easy to do and works fine no probs.
     
  8. sportstractor

    sportstractor Chugger

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    Same, iv got an AMK and nothing negative has resulted
     
  9. s3dave

    s3dave TFSI Hybrid Supporter

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    If you are worried about it, dont do it, there is plenty of info on here with zero negatives...you must have read something to know about it?
     
  10. Speedy Steve

    Speedy Steve Active Member

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    Just do it!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
     
  11. paulsaudi

    paulsaudi Member

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    Right i have decided..........i am going to do it!!!!

    So with my AMK engine just run 4mm hose from top of DV to inlet???

    Thanks for comments guys ; )
     
  12. SiGainey

    SiGainey Member

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    Yup, leave the valve connected electronically and just run from inlet to dv. 1m of 4mm ID hose required.
     
  13. Chlippo

    Chlippo Member

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    and let us know what you think (maybe take a couple of pictures too)
     
  14. Sam_

    Sam_ Down under

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    I done it. No complaints. If anything, it ran better. With cars of this age and producing the heat they do, there's bound to be a leak in all that extra kak.
     
  15. Prawn

    Prawn My other car is a MINI!!!!

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    There's really no reason not to do the n249 bypass on these. The only time you hear problems is when people have done it wrong!

    On cars with the SAI you need to make sure it's still plumbed in correctly, and part of that is refitting a check valve many people leave out, which stops the n112 seeing boost.

    I recently bypassed my n112 totally as well, and I've not had any problems at all with it
     
  16. S3featesV9

    S3featesV9 Active Member

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    how easy is this to do on a BAM? all i need is a 1meter piece of 4mm hose? ive looked at a thread showing how to do it. looks confusing. maybe it isnt though. and im a mechanic :S

    Cheers
     
  17. djarchive

    djarchive Member

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    Can you essencially bin all the unwanted / needed plumbing + pipes that are no longer needed *after by-passing the spagetti junction* on top of the head? Will I need this again?

    Just one pipe from top of the DV to the one that comes out of the Inlet Manifiold?




    What reason is the N249 there? To monitor boost?
     
  18. s3dave

    s3dave TFSI Hybrid Supporter

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    Check valve...lol...Where?
     
  19. Welly

    Welly VX220 SC Driver :)

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