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N249 Bypass/Removal

Discussion in 'A3/S3 Forum (8L Chassis)' started by Welly, Dec 2, 2009.

  1. <tuffty/>

    <tuffty/> Badger 5 Edition...Its all about the flow...
    Staff Member Moderator Audi S3

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    As mentioned further up, just extend the wiring and stash it out of sight if you really want to remove the covers and brackets etc... You will prob have to do the same sorta thing to hide the resistor anyway and this way you know the ECU won't complain.

    <tuffty/>
     
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  3. Welly

    Welly VX220 SC Driver :)

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    Or explode as you pointed out Tuffty!! I'm a bit dubious about the resistor mod... I'm going to get a few resistors and test with a multimeter over the weekend.
     
  4. Dani_B19

    Dani_B19 Audi-sports own special child.

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    Well let us know how you get on mate.
     
  5. Welly

    Welly VX220 SC Driver :)

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    Will do.
     
  6. <tuffty/>

    <tuffty/> Badger 5 Edition...Its all about the flow...
    Staff Member Moderator Audi S3

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    If there is any info on this at all I would have thought cupra net would have it... the ibiza boys are always messing about with stuff..

    <tuffty/>
     
  7. Welly

    Welly VX220 SC Driver :)

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    Yeah, there is to be fair.... Thats where I first saw the guide to bodging a resistor inline.
     
  8. Andrew@A.L.D

    Andrew@A.L.D May add NOS to 600+bhp?

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    Nice right up and will be doing this with my rebuild
     
  9. JS1500

    JS1500 Howdy

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    Just keep the bonnet closed - can't get neater than that surely!
    What you can't see doesn't exist.
     
  10. m444ty p

    m444ty p Member

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    Just done this and my car feels so much better now!!!
     
  11. 1animal1

    1animal1 The Clar!! it mouves!!!
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    i was always under the impression the vac chamber was there to maintain some boost ensuring a smoother drive and smoother gear changes because it helped hold the revs better....ie less drop off on revs on slower gear changes means potentially more jerkyness...... thoughts?
     
  12. Westy

    Westy Double Dark Side! Diesel & 8P

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    Vac chamber is there to hold a small amount of boost so that the ecu can use that boost to open the dv if it needed to. The bypass just sets up the car how most old turbo cars are where the dv only opens when the tb closes.

    It's just another thing that can go wrong and another set of pipes to split :laugh:
     
  13. 1animal1

    1animal1 The Clar!! it mouves!!!
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    dont about you lot but i cant be a**ed :)
     
  14. LordNelson

    LordNelson Member

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    think i am gonna have to be doing this at the weekend, found some split pipes in the vacuum circuit. the list grows! but so does my knowledge :eyebrows:
     
  15. Welly

    Welly VX220 SC Driver :)

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    And knowledge is power baby. yeah! Or so I'm told.....:whistle2:
     
  16. Westy

    Westy Double Dark Side! Diesel & 8P

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    That's just lazy mate! Try it you might like it. I was going to do mine this weekend but I've been ill :blownose:
     
  17. gez

    gez S3 hunter

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    I done mine yestday. No noticable change but it makes sense to do it. Gives the ecu less chance to suddenly drop the power when you dont want it to.
     
  18. Westy

    Westy Double Dark Side! Diesel & 8P

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    I'm up for any mod that involves simplifying the boost circuit. I used to own a Renault 5 gt turbo back in the day and the RTOC boys used to remove metres of boost hose to improve the circuit. Happy days
     
  19. 1animal1

    1animal1 The Clar!! it mouves!!!
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    gez.... though the idea was the opposite.... ie as westle said.... the vacuum tank preserves some boost, presumebly to reduce lag
     
  20. Welly

    Welly VX220 SC Driver :)

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    That said, the vac hoses from the chamber only connect to the vac nipple on the DV.

    The air in the vac chamber never even gets close to the air going into the tip, so how would it reduce lag?

    The only reason the air is there is to enable the ECU to open the DV if it sees the need to. I don't. So the ECU can get f**ked. :)
     
  21. <tuffty/>

    <tuffty/> Badger 5 Edition...Its all about the flow...
    Staff Member Moderator Audi S3

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    word...

    <tuffty/>
     
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  23. Westy

    Westy Double Dark Side! Diesel & 8P

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    Lol. Amen to that
     
  24. 1animal1

    1animal1 The Clar!! it mouves!!!
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    hey im am being sold this now :)

    so why does the ECU need to be able to control the DV...... im of the mindset that its there for a reason and just need to set this right in my own mind
     
  25. Welly

    Welly VX220 SC Driver :)

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    For two reasons I can think of.

    Firstly to enable boost stabilisation, if it sees more boost from the MAP sensor, then it will dump it out of the DV instead of enabling limp mode... I won't miss this because in my mind, if you have more boost than requested, there is something wrong anyway, so there will be other symptoms. I'd rather it hit limp mode as then I'd know about the problem.

    Secondly, it aids the traction control. It allows the ECU to stop you hammering it whilst experiencing excessive lateral G. F**k that. I will hammer it if I want to!
     
  26. turbos3

    turbos3 turbo nut

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    i by passed the n249 valve today as when i put foot down cumming off roundabouts it sumtimes dumps the boost sumat 2 do with the traction control i think now it holds boost fine audi wanted £300 2 sort the problem so thanks for the info on ere guys worked wonders
     
  27. OllieH

    OllieH Member

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    :sign_welcome:
     

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