Chris NottSky Insurance
Results 1 to 37 of 37
  1. #1
    S3 Paul's Avatar
    6th Gear

    Status
    Offline
    Join Date
    Oct 2006
    Posts
    2,764

    N249 Bypass on a 2001 AMK car ( with a BAM engine if it makes any odds)

    From time to time my car seems to be "off the money"
    I mean some times feels a little flat and not as eager as it does at other times.
    Some days i remember why i have the car when it makes me smile ,
    Other times it could easy be standard power, Among things ive been told to try is the N249 bypass. Check the condition of my Forge DV ( piston and seat) Vac hoses? And a small boost leak? The car still makes 22psi and the AFR doesnt change when the car is on it or off.
    So if the Bypass is as straight forward as i keep being told i will try it... Does anybody have any tips as to whats diffrent from the other engine codes??
    Noggy Blue 2001 S3

    I ask questions because i change my mind so much. If i ask questions you have already covered... just leave it be?

  2. # ADS
    ADS
    Join Date
    Always
    Posts
    Many
     
  3. #2
    <tuffty/>'s Avatar
    Badger 5 Edition

    Status
    Online
    Join Date
    Sep 2008
    Location
    Gloucestershire
    Posts
    15,558
    N249 bypass is simple on AMK/BAM engine codes...

    3mm id silicon vac pipe from the outlet under the inlet mani where the original pipe fits on next to the FPR pipe just above where the alternator is... take it striahgt to the top of the DV... leave the N249 electrically plugged in and jobs done...

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

  4. #3
    S3 Paul's Avatar
    6th Gear

    Status
    Offline
    Join Date
    Oct 2006
    Posts
    2,764
    Thats great news. Thankyou
    Does it sound like a good idea to try it?
    I know its said to be a worth while mod long term but im trying to find the cause of my moody S3
    Noggy Blue 2001 S3

    I ask questions because i change my mind so much. If i ask questions you have already covered... just leave it be?

  5. #4
    <tuffty/>'s Avatar
    Badger 5 Edition

    Status
    Online
    Join Date
    Sep 2008
    Location
    Gloucestershire
    Posts
    15,558
    Bit more responsive, less pipes and crap laying about the engine bay... worth a punt...

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

  6. #5
    Ashley g's Avatar
    1st Gear

    Status
    Offline
    Join Date
    Feb 2011
    Location
    High Wycombe Bucks
    Posts
    178
    3mm hose? ********. Just ordered 4mm id hose, is that going to be too big?
    2003-03 8L S3 Dolphin grey - Porsche 996 calipers - Mo-vit 325mm 2 piece front discs - 15mm spacers all round - Miltek resonated cat back - Genuine RS4's - Vredestein Sessanta's - Forge 007p - Forge TIP - JR cone filter - Poweflex diesel dog bone bush - AMD Remap - Blue Haldex controller - FK AK Coilovers - Seat Leon Cupra R top mounts - 8P S3 gear knob and gaitor - TT pedals - Neuspeed quick shift - LED number plate bulbs



    14.2 quarter @ 97 mph

    Power? 241 bhp with a boost leak, now fixed

  7. #6
    <tuffty/>'s Avatar
    Badger 5 Edition

    Status
    Online
    Join Date
    Sep 2008
    Location
    Gloucestershire
    Posts
    15,558
    3mm/4mm should be fine... use cable ties to secure

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

  8. #7
    S3 Paul's Avatar
    6th Gear

    Status
    Offline
    Join Date
    Oct 2006
    Posts
    2,764
    Well ive had a good old hunt around the engine bay... I never realised the bypass was so obvious !
    Just a couple of questions...
    My Boost gauge feed is from the pipe that goes to the top of the DV... will it make the needle flicker as it did when a garage moved it to the FPR?
    What actual function does the valve have? I know it controls the DV but when and why??
    As for my "Moody" performance...
    I have found yet another split hose.
    This time its the one on the left hand end of the inlet , the one that seems to double back on itself?
    Im sure ive seen silicone ones on ebay and the like... As the one on the car has managed 10 years do i upgrade or simply replace??
    Noggy Blue 2001 S3

    I ask questions because i change my mind so much. If i ask questions you have already covered... just leave it be?

  9. #8
    <tuffty/>'s Avatar
    Badger 5 Edition

    Status
    Online
    Join Date
    Sep 2008
    Location
    Gloucestershire
    Posts
    15,558
    N249 is a switching valve... vacuum is used to open/keep open the DV while boost keeps it shut... the N249 and the vacuum tank is there so the ECU can dump boost using the DV if it doesn't like something... the vacuum tank is there so it has vacuum to enable it to dump under boost which it obviously can't if it just had a vacuum pipe going to it...

    The ECU gets ansy, switches the N249 so instead of the DV getting the feed of boost from the inlet mani it gets the vacuum in the vacuum store enabling it to operate the DV and dump boost... phew!

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

  10. #9
    SiGainey's Avatar
    2nd Gear

    Status
    Offline
    Join Date
    Sep 2003
    Location
    North Wales
    Posts
    475
    Forge do a replacement for the bam engine I think...
    '01 AMK, completely standard except for the Ambient Lighting Pack.

  11. #10
    Dan-Jnr's Avatar
    3rd Gear

    Status
    Offline
    Join Date
    Jun 2011
    Location
    Manchester
    Posts
    691
    I did this last night on my BAM, solved my boost drop.
    I joined the thinner vacuum hose to the thicker dv hose.
    You can see the join just near the white t-piece.

    2007 - Imola Yellow- Audi S3 - 305
    [8L BLOG] [8P BLOG]

  12. #11
    sean_s3's Avatar
    1st Gear

    Status
    Online
    Join Date
    May 2009
    Location
    West Yorkshire
    Posts
    264
    @ Paul . The U shaped pipe I believe is the brake vacuum hose.
    S3 Big Turbo

  13. #12
    Westy's Avatar
    Double Dark Side! Diesel & 8P

    Status
    Offline
    Join Date
    Dec 2008
    Location
    Cambridgeshire sometimes Hertfordshire
    Posts
    17,273
    Paul I had the exact same issues as you did once apon a time and most of it is hose related.

    I changed all boost hoses and as many hoses as I possibly could for silicone hoses. The 2 main area I found helped on keeping consistent power is to do the N249 bypass and also fit a catch can and vent to atmosphere.
    8P A3 TDI - 220bhp - 335lbft
    A3 Maintenance Thread
    Bye bye S3 you will be missed.
    S3 Build Thread







  14. #13
    S3 Paul's Avatar
    6th Gear

    Status
    Offline
    Join Date
    Oct 2006
    Posts
    2,764
    Thanks for all the help.
    I understand the need for leaving the N249 electricaly connected but do i need to leave the pipes on? should i blank them off? leave them open ?
    Noggy Blue 2001 S3

    I ask questions because i change my mind so much. If i ask questions you have already covered... just leave it be?

  15. #14
    Westy's Avatar
    Double Dark Side! Diesel & 8P

    Status
    Offline
    Join Date
    Dec 2008
    Location
    Cambridgeshire sometimes Hertfordshire
    Posts
    17,273
    Quote Originally Posted by S3 Paul View Post
    Thanks for all the help.
    I understand the need for leaving the N249 electricaly connected but do i need to leave the pipes on? should i blank them off? leave them open ?
    Leave all connections on the valve open and remove the hoses from them.

    Like this:

    8P A3 TDI - 220bhp - 335lbft
    A3 Maintenance Thread
    Bye bye S3 you will be missed.
    S3 Build Thread







  16. #15
    S3 Paul's Avatar
    6th Gear

    Status
    Offline
    Join Date
    Oct 2006
    Posts
    2,764
    Is that a T piece i see?
    Is it for a boost gauge or something?
    Ive just dont this Mod today, The car feels more responsive, DV is a bit more snapy if that makes sence?
    I have a vac leak on the brake vac hose and my new part willnt be here till next week, But from how the car felt on the way home to how it felt on the short test drive.... much better, Cant wait till ive got the hose on...
    Noggy Blue 2001 S3

    I ask questions because i change my mind so much. If i ask questions you have already covered... just leave it be?

  17. #16
    sean_s3's Avatar
    1st Gear

    Status
    Online
    Join Date
    May 2009
    Location
    West Yorkshire
    Posts
    264
    Paul which Brake vacuum hose did you buy ? I've seen silicone ones ranging from £10 - £20 and i'm replacing this hose myself in a few week.

    Cheers.
    S3 Big Turbo

  18. #17
    Westy's Avatar
    Double Dark Side! Diesel & 8P

    Status
    Offline
    Join Date
    Dec 2008
    Location
    Cambridgeshire sometimes Hertfordshire
    Posts
    17,273
    Quote Originally Posted by S3 Paul View Post
    Is that a T piece i see?
    Is it for a boost gauge or something?
    Ive just dont this Mod today, The car feels more responsive, DV is a bit more snapy if that makes sence?
    I have a vac leak on the brake vac hose and my new part willnt be here till next week, But from how the car felt on the way home to how it felt on the short test drive.... much better, Cant wait till ive got the hose on...
    Yes mate T is for my boost guage. DV is a lot more snappy due to the vacuum not having to go round that stupid system onto the N249 valve
    8P A3 TDI - 220bhp - 335lbft
    A3 Maintenance Thread
    Bye bye S3 you will be missed.
    S3 Build Thread







  19. #18
    S3 Paul's Avatar
    6th Gear

    Status
    Offline
    Join Date
    Oct 2006
    Posts
    2,764
    I realy wish i had done this ages ago... but every new little mod makes you smile so... even with my hose still in the post... a happy test drive,
    How ever...
    On a not so good note... ive found the next "problem" im guessing not only i will have seen...
    The wires to the coil packs . The insulation on nearly all of them had split so bare wires right left and centre!
    Ive repaired what i can so now hope all is well.
    Bloody cars !
    Noggy Blue 2001 S3

    I ask questions because i change my mind so much. If i ask questions you have already covered... just leave it be?

  20. #19
    Westy's Avatar
    Double Dark Side! Diesel & 8P

    Status
    Offline
    Join Date
    Dec 2008
    Location
    Cambridgeshire sometimes Hertfordshire
    Posts
    17,273
    Quote Originally Posted by S3 Paul View Post
    I realy wish i had done this ages ago... but every new little mod makes you smile so... even with my hose still in the post... a happy test drive,
    How ever...
    On a not so good note... ive found the next "problem" im guessing not only i will have seen...
    The wires to the coil packs . The insulation on nearly all of them had split so bare wires right left and centre!
    Ive repaired what i can so now hope all is well.
    Bloody cars !
    Paul try to do the catch can at some point, this gets rid of all the perishing hose in the breather system. I guarantee that you have a split in it somewhere.
    8P A3 TDI - 220bhp - 335lbft
    A3 Maintenance Thread
    Bye bye S3 you will be missed.
    S3 Build Thread







  21. #20
    S3 Paul's Avatar
    6th Gear

    Status
    Offline
    Join Date
    Oct 2006
    Posts
    2,764
    Quote Originally Posted by sean_s3 View Post
    Paul which Brake vacuum hose did you buy ? I've seen silicone ones ranging from £10 - £20 and i'm replacing this hose myself in a few week.

    Cheers.
    I opted for one from creative ... something or another,
    Sorry i cant remember just now, It was £12.98 with postage... it was the only place that had one in stock, I will let you know how it fairs...
    Noggy Blue 2001 S3

    I ask questions because i change my mind so much. If i ask questions you have already covered... just leave it be?

  22. #21
    sean_s3's Avatar
    1st Gear

    Status
    Online
    Join Date
    May 2009
    Location
    West Yorkshire
    Posts
    264
    Sounds like the same one I've seen , if its decent quality then its a steal at that price.

    Cheers.
    S3 Big Turbo

  23. #22
    S3 Paul's Avatar
    6th Gear

    Status
    Offline
    Join Date
    Oct 2006
    Posts
    2,764
    I know we have all seen it before... but heres how it looks now and what came off.
    I had a spare N249 so used that so i could leave what i took off in one complete mess.





    This is the mess now sat in a box in my flat.
    Where it will stay unless i hear some shocking news that my car will explode unless i refit it.
    Noggy Blue 2001 S3

    I ask questions because i change my mind so much. If i ask questions you have already covered... just leave it be?

  24. #23
    Westy's Avatar
    Double Dark Side! Diesel & 8P

    Status
    Offline
    Join Date
    Dec 2008
    Location
    Cambridgeshire sometimes Hertfordshire
    Posts
    17,273
    Throw it in the bin mate
    8P A3 TDI - 220bhp - 335lbft
    A3 Maintenance Thread
    Bye bye S3 you will be missed.
    S3 Build Thread







  25. #24
    <tuffty/>'s Avatar
    Badger 5 Edition

    Status
    Online
    Join Date
    Sep 2008
    Location
    Gloucestershire
    Posts
    15,558
    Welcome to the club....

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

  26. #25
    S3 Paul's Avatar
    6th Gear

    Status
    Offline
    Join Date
    Oct 2006
    Posts
    2,764
    Quote Originally Posted by sean_s3 View Post
    Paul which Brake vacuum hose did you buy ? I've seen silicone ones ranging from £10 - £20 and i'm replacing this hose myself in a few week.

    Cheers.
    The hose turned up today... to be fair it looks more than upto the job, I will hopefully fit it tomorrow dinner time.
    ...






    Aslong as it fits... im happy.
    Noggy Blue 2001 S3

    I ask questions because i change my mind so much. If i ask questions you have already covered... just leave it be?

  27. #26
    Lemon S3's Avatar
    Alex

    Status
    Offline
    Join Date
    Sep 2009
    Location
    Bicknacre, Essex
    Posts
    1,314
    Can this be done on an APY? If so, how much different is it?
    1999 APY S3 Imola Yellow

    PS3: Broady_11

  28. #27
    <tuffty/>'s Avatar
    Badger 5 Edition

    Status
    Online
    Join Date
    Sep 2008
    Location
    Gloucestershire
    Posts
    15,558
    Quote Originally Posted by Lemon S3 View Post
    Can this be done on an APY? If so, how much different is it?
    Link for APY is in the stickies...

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

  29. #28
    Lemon S3's Avatar
    Alex

    Status
    Offline
    Join Date
    Sep 2009
    Location
    Bicknacre, Essex
    Posts
    1,314
    Quote Originally Posted by <tuffty/> View Post
    Link for APY is in the stickies...

    <tuffty/>
    Literally found Welly's thread 10 seconds after posting. N249 Bypass How To (2000 S3 - but same for many)
    1999 APY S3 Imola Yellow

    PS3: Broady_11

  30. #29
    Gops's Avatar
    6th gear @7000rpm

    Status
    Offline
    Join Date
    Nov 2009
    Location
    Coventry
    Posts
    2,634
    It's easy on APY, did mine! Advice, be careful with the n112 valve. The clamps on the pipes make it hard to take the pipe off and breaks the nipple on the valve! Buy 2 t-pieces just incase lol. Catch can is my next thing to eliminate split pipes!
    Quote Originally Posted by <tuffty/> View Post
    its either mapped or broken...

  31. #30
    1st Gear

    Status
    Offline
    Join Date
    May 2012
    Location
    Manchester
    Posts
    229
    not sure why everybody uses silicone pipe, on mine all i did was take the pipe from the inlet mani - the n249 and take it off the n249 end. Then i took the pipe from the d/v to the n249 off from the n249 end and the pipe from the inlet mani pushed straight into the d/v pipe and is secure enough, 2 min job

  32. #31
    <tuffty/>'s Avatar
    Badger 5 Edition

    Status
    Online
    Join Date
    Sep 2008
    Location
    Gloucestershire
    Posts
    15,558
    Quote Originally Posted by karl210 View Post
    not sure why everybody uses silicone pipe, on mine all i did was take the pipe from the inlet mani - the n249 and take it off the n249 end. Then i took the pipe from the d/v to the n249 off from the n249 end and the pipe from the inlet mani pushed straight into the d/v pipe and is secure enough, 2 min job
    The whole point is to 'bypass' the N249... not sure what you have done here... yes on the AMK/BAM (non SAI engines) its as easy as taking the pipe from the inlet mani direct to the top of the DV (hence the reason most use a single piece of silicon as its an easy and cheap way to do it) but can't picture what you have done here...

    Can you explain it a little more as others will read this and get a little confused...

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

  33. #32
    1st Gear

    Status
    Offline
    Join Date
    May 2012
    Location
    Manchester
    Posts
    229
    Quote Originally Posted by <tuffty/> View Post
    The whole point is to 'bypass' the N249... not sure what you have done here... yes on the AMK/BAM (non SAI engines) its as easy as taking the pipe from the inlet mani direct to the top of the DV (hence the reason most use a single piece of silicon as its an easy and cheap way to do it) but can't picture what you have done here...

    Can you explain it a little more as others will read this and get a little confused...

    <tuffty/>
    Yeah im not the best at explaining things....
    You can see the pipe from the d/v that went to the n249, i have connected it straight to the pipe coming from the inlet manifold, they fit straight into each other, heres a pic ive just taken:



    My engine is amk by the way

  34. #33
    <tuffty/>'s Avatar
    Badger 5 Edition

    Status
    Online
    Join Date
    Sep 2008
    Location
    Gloucestershire
    Posts
    15,558
    Ah... ok... you have just pushed the smaller hose into the larger one?... not ideal tbh... potential for boost/vac leaks and on mapped boost the possibility for them to pop apart... I have seen this on clamped charge pipes with no beading so a pipe pushed into another isn't something I would be doing...

    tbh silicone vac hose is cheap enough to buy from ebay so it s a no brainer to replace the whole thing...

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

  35. #34
    Lemon S3's Avatar
    Alex

    Status
    Offline
    Join Date
    Sep 2009
    Location
    Bicknacre, Essex
    Posts
    1,314
    Quote Originally Posted by Gops View Post
    It's easy on APY, did mine! Advice, be careful with the n112 valve. The clamps on the pipes make it hard to take the pipe off and breaks the nipple on the valve! Buy 2 t-pieces just incase lol. Catch can is my next thing to eliminate split pipes!
    Does your n112 valve have 3 nipples? two next to each other (one 90 degree to the other) and one at the other end next to the plug? if so where does the nipple by the plug go or is it bunged or vented to atmosphere?
    1999 APY S3 Imola Yellow

    PS3: Broady_11

  36. #35
    vrbob's Avatar
    Thats no Moon, Thats a space station!

    Status
    Offline
    Join Date
    Jun 2007
    Location
    Southampton
    Posts
    2,362
    Did this today on my BAM engine.

    Very straightforward once you understand what your looking at. I bought a 1m length of silicone pipe 3mm internal diameter off ebay for £2 delivered. this is easily enough to do the job and keep it neat i followed tuftys advice and used small cable ties to hold the pipe on to the DV etc.

    Decided to keep the plate the N249 was fitted to ontop of the block like others have to hold the N249 but only used to screws to make it easy to remove when changing plugs etc.

    Will see if i notice any difference
    Audi S3 8L BAM 225 2002 - Ming Blue : Silver Heated Leather, Armrest, RNS-E - Bose, Alloy Mirrors, 18" RSTT`s, Sunroof, Cruise, AutoDim Mirror & Usual S3 Extras.
    Mods : Badger 5 Stg 2 Custom Map, FMIC, 3" DP & 200 Cell Cat, 007P, Jetex Filter & 80mm TIP & Heatshield, Complete LED Kit, Gen VW Aero Wipers, Full Powerflex Kit, R32 RARB, AP Shocks & Springs, 15mm Front & 20mm Rear Spacers, BB Uprated Actuator,
    N249 Delete & Catch Can, AP TVR 4Pot Brakes & DS2500`s, Sachs Carbon/Kevlar Clutch

  37. #36
    rhubarb4's Avatar
    Certified Jardo Slayer

    Status
    Offline
    Join Date
    Mar 2008
    Location
    Midlands
    Posts
    1,715
    Let us know what you think as I feel its more responsive and punchy.

    Chris.
    <img src=http://cdn.as-static.com/vb/images/smilies/scared2.gif border=0 alt= title=Scared2 class=inlineimg />
    Quote Originally Posted by superkarl View Post
    i wear ladies underwear to work.

  38. #37
    1st Gear

    Status
    Offline
    Join Date
    Nov 2011
    Location
    pboro
    Posts
    185
    found this on a cupra r site


    im yet to do this to mine but possibly attempt tomorro but only have 5mm id piping left although it seems to fit fine on the outlet on the underside of the inlet and is on securely


 

 

Similar Threads

  1. N249 Bypass Guide for ARY Engine and all other A3 Engines
    By Syvo in forum A3/S3 Forum (8L Chassis)
    Replies: 69
    Last Post: 10th June 2014, 16:34
  2. AMK or BAM engine?
    By wilcog33 in forum A3/S3 Forum (8L Chassis)
    Replies: 31
    Last Post: 10th June 2013, 02:31
  3. N249 Bypass on a BAM
    By S3featesV9 in forum A3/S3 Forum (8L Chassis)
    Replies: 48
    Last Post: 6th February 2012, 23:17
  4. Did N249 bypass and car ran like poop.
    By talentwalsh in forum A3/S3 Forum (8L Chassis)
    Replies: 9
    Last Post: 17th December 2010, 11:21
  5. Audi S3 8L N249 valve bypass APY ENGINE 1999
    By hi456 in forum A3/S3 Forum (8L Chassis)
    Replies: 2
    Last Post: 16th September 2010, 20:27

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •  
Single Sign On provided by vBSSO

Garage Plus, Vendor Tools vBulletin Plugins by Drive Thru Online, Inc.

Content Relevant URLs by vBSEO