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  1. #1
    A3 T's Avatar
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    Exclamation N249 Bypass Guide (AUM).

    My threads seem to just amount to nothing recently but thought i would ask this anyway.....

    Is there a guide to do the n249 bypass on the aum engine?


    I've found loads of guides for other engines but there always a comment about it being a bit different on the aum.


    Also I've read about using some sort of resister so that everything can be removed after the bypass.


    A before and after pic would be good to show what's been changed
    Audi A3 T sport (8l) AUM 2001..... Stage 1 Remap , Bailey DV30 , HID Headlights , LED Sidelights/Footwells , Catch Can , N249 Bypass , Tinted Windows .....

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  3. #2
    A3 1.8t Quattro Sport!

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    i have a different engine, but after reading loads of guides that confused me..

    basicly, you need to find out where the pipe comes from the inlet manifold to the n249 valve..

    take that off.. run a new pipe to the dump valve from the nipple on the inlet manifold you just took off.

    then take off all the other pipes etc that are related.

    just leave the actual valve electronicly plugged in and hide it away (so it doesnt bring mess the ecu) rather than trying to get the right resistor

  4. #3
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    What are the benefits of doing this?

    DC
    His: 2001 1.8T AUM. Hibiscus Red Pearl Effect - Hers: 2002 1.8T AUM. Metalic Silver.

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    This should help its from my thread Things to do for free

    Quote Originally Posted by Welly View Post
    Here is a guide for the AUM specifically:

    guide to bypass the n249 valve - uk-mkivs

    It is in a MK4 Golf, but the A3 should be the same IIRC..

    The AUM procedure is a little different to the APY.

  6. #5
    Alex C's Avatar
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    why is the AUM different to any other 1.8T when doing the bypass, i cant believe that it is, someone enlighten me

    Wellys guide is slightly more involved because he had secondary air injection to deal with as well

    And why the UK mkivs AUM guide Ts into the FPR line i have no idea, it means he has to plug the original line. Where as if he simply ran the pressure line from the inlet manifold (from the original n249 connection) to the top of the DV he wouldnt have to bodge any plugs in hoses and could remove everything...??
    Alex S3 AMK
    Bilstein B8s, H&R Springs, Neuspeed ARBs, Genuine 18" BBS LMs & LCR Brembos

  7. #6
    A3 1.8t Quattro Sport!

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    yeah dont T into the FPR line, i done this at first!

    improved DV responce, louder DV noise aswell...

    and the N249 valve controlls boost via the DV for traction control.. and the ecu sometimes decides to dump boost for no reason!

    so by doing the bypass, your only getting total boost (almost) without the ecu deciding otherwise!

  8. #7
    A3 T's Avatar
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    Thanks for all the replies everyone


    I have seen the link link above but I've also read that you shouldn't tap into the fpr so I'm looking at a guide showing the correct way (not tapping into the fpr....lol) to do it.

    Also its a shame that there wasn't a picture showing what it should look like once its all been done.

    From reading it it looks like you would just T the hose on the fpr and run your own pipe to the top of the DV like this:

    Audi A3 T sport (8l) AUM 2001..... Stage 1 Remap , Bailey DV30 , HID Headlights , LED Sidelights/Footwells , Catch Can , N249 Bypass , Tinted Windows .....

  9. #8
    Alex C's Avatar
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    Here is Welly's guide, he has had to do the pipe work for the SAI, so assuming that you do not have SAI then Wellys guide is a bit different but just apply some logic

    N249 Bypass How To (2000 S3 - but same for many)


    This is Jamies recent threads when he got a bit lost with the n249 bypass

    N249 removal help please.. (pic enclosed)
    just fitted my DV..

    And from Wellys thread some pics of the bypass done by jonny87

    Quote Originally Posted by jonny87 View Post
    well i finally got round to doing the n249 bypass mate, following your guide was easy as anything so kudos there bud, to be fair once i got started it became pretty obvious what needed doing, took me about an hour to do so not too much time spent in the cold lol

    heres some pics, i forgot to take a before pic but im sure you all know what it looks like



    i tee'd mine underneath the inlet manifold so that its not so visible, just makes it look that little bit neater imo


    also with my n249 valve i managed to sort of hide mine between the chargepipe and some heatproof material/matting whatever you want to call it!!


    i suppose if you wanted to be really fussy you could extended the two wires to the valve and then you could place where ever you so wished to, like your's welly is still on show above the coilpacks, depends if it bothers you or not

    i didnt have enough hosing to replace the one from the n112 to the sai, but this is easy enough for me to do at a later date

    so big shout out to welly for taking the time to do the how to guide, made the job a hundred times easier
    ...

    he has used red pipe, he has connected one end of the red pipe to the diverter valve (pic 1) take the other end of that red pipe and attach it to the nipple on the inlet manifold where the original N249 pipe work was connected (pic 2)... (he T'd it under the inlet manifold because he has SAI, but ignore it if you dont, i.e. no need to T)

    ...so...one pipe...two ends...two connections...and much confussion. I know these pics are for an s3 but same concept, 1 inlet manifold, 1 diverter valve and 1 silicon 4mm ID pipe.

    and Jonny's pic #3 shows the N249 valve with all of the pipe work removed but still electricaly connected and nicely stowed away

    hope this helps
    Alex S3 AMK
    Bilstein B8s, H&R Springs, Neuspeed ARBs, Genuine 18" BBS LMs & LCR Brembos

  10. #9
    A3 T's Avatar
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    Thanks mate
    Ill have a look at it when I get home on the pc.
    Audi A3 T sport (8l) AUM 2001..... Stage 1 Remap , Bailey DV30 , HID Headlights , LED Sidelights/Footwells , Catch Can , N249 Bypass , Tinted Windows .....

  11. #10
    A3 T's Avatar
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    Just had a quick look and it looks a lot more complicated than running a hose from the top of the dv to the manifold.....LOL
    Audi A3 T sport (8l) AUM 2001..... Stage 1 Remap , Bailey DV30 , HID Headlights , LED Sidelights/Footwells , Catch Can , N249 Bypass , Tinted Windows .....

  12. #11
    Alex C's Avatar
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    Quote Originally Posted by A3 T View Post
    Just had a quick look and it looks a lot more complicated than running a hose from the top of the dv to the manifold.....LOL
    LOL.....indeed, i am trying my best here

    Just because it looks complicated doesnt mean the fix is, one of the reasons the bypass is done is because the pipe work is complicated therefore there is so much potential for a leak somewhere. The diverter valve opens when there is a vacuum in the inlet manifold protecting the turbo from pressure surge. The reason for all the crap involved with the N249 valve is that audi wanted the traction control to be able to cut power when it felt the need. OK, so what if your wide open throttle mid corner and the ESP wants to open the DV to save you from yourself? It uses the vacuum in the inlet manifold to open the DV...ah, but no, there is no vacuum because you are WOT. So how does it open the DV? It uses the vacuum reservoir, a reservoir of vacuum that it uses just in case. So how does this vacuum reservoir always have vacuum in it? Well thats where all of that complicated pipe work comes in with its loops and one way check valves, so yes it looks complicated but the basic function is very very simple. If you do the N249 bypass, i.e. remove the vacuum reservoir and the need for the N249 then you return to the simple operation of the DV i.e. it opens when there is a vacuum in the inlet manifold.


    Do you have SAI? Secondary Air Injection? YES/NO

    YES...

    Follow wellys guide N249 Bypass How To (2000 S3 - but same for many)

    run a 4mm ID pipe from the top of the DV to a T piece. Take a pipe from one of the remaining two T piece outlets and connect it to the inlet manifold where your original N249 pipe work connected. Take a second pipe from the third and final outlet of your T piece and connect the other end to the N112 valve (this is the valve that is involved with your SAI (secondary air injection)

    This is Wellys pic of the end result for cars with SAI. To be fair I thought Wellys guide was spot on and clear



    Do you have SAI? Secondary Air Injection? YES/NO

    NO...

    see post #8

    Quote Originally Posted by A3 T View Post
    Just had a quick look and it looks a lot more complicated than running a hose from the top of the dv to the manifold.....LOL


    From N249 Bypass How To (2000 S3 - but same for many)

    Quote Originally Posted by IOM-S3 View Post
    hey guys, i was going to attempt this mod, however i only have 1 vac pipe coming up from the inlet area? why is this, is it because some models do not have the n112 valve??

    cheers
    lee
    Quote Originally Posted by Welly View Post
    Correct.
    Quote Originally Posted by IOM-S3 View Post
    awesome so does this mean i do not need a t piece?

    thanks mate
    Quote Originally Posted by Welly View Post
    No, you can just run 1 pipe from the DV to the inlet mani.
    Quote Originally Posted by Dazboss View Post
    I've done it, i too only had to use one pipe. What a difference its made

    From just fitted my DV..

    Quote Originally Posted by superkarl View Post
    Lol. The n249 bypass is sooooo easy dude! You just need one 4mm ID pipe that goes from the inlet manifold to the top of the dump valve. Leave the n249 plugged in electronically and THAT'S IT! An open cone filter will make it louder. Does it have the right spring in it, is it actually dumping?
    Quote Originally Posted by Cookstein View Post
    you shouldn't be playing with the FPR... leave it alone, dont touch it, put it back like it was

    this is a schematic of your setup i think....you dont have secondary air injection? I may regret asking



    OK, arrow #5 points to your DV
    arrow #14 points to the connection on the inlet manifold where you N249 valve is connected too


    Right.....take the pipe from the top of the DV at #5 and connect it to the connection at #14...done.

    The rest of the N249 pipework (including the vacuum reservoir can all be removed and thrown in the bin because they are now bypassed i.e. not connected to any thing.

    BUT... leave the N249 valve where it is with the electrical connection still attached...

    ok?

    Quote Originally Posted by superkarl View Post
    Dude I'm so sorry I coudnt reply to your pm sooner, ive been caked in oil on my own car today mate. Cookstein has it bang on above. Just one pipe, one complete pipe,from dv to inlet mani nipple, and thats it man. Easy as that. Take anything to the n249 off to tidy it up and your done.
    Quote Originally Posted by ja3mie View Post
    i will do a guide now i fully understand! it really is simple.. IGNORE EVERYTHING I ASKED. it will confuse you lol

    basicly, unplug the vac pipe on the inlet manifold next to the fuel pressure reg pipe (you can see it going to the reg as its short)

    then run a pipe from that to the dumpvalve... DONE! lol

    just remove any un needed pipework!

    i will do a picture guide showing specificaly for our engines, sure it will help out!

    smoother throttle, improved DV responce as theres less piping for the vacuum to go through!

    i also heard the tractioncontrol is partly run by this? the ecu makes the n249 open to DV releasing pressure and dropping power..

    plus, its made my dv30 dumpvalve ALOT louder! lol
    Quote Originally Posted by A3 T View Post
    My threads seem to just amount to nothing recently...
    we are trying
    Last edited by Alex C; 14th June 2011 at 10:52.
    Alex S3 AMK
    Bilstein B8s, H&R Springs, Neuspeed ARBs, Genuine 18" BBS LMs & LCR Brembos

  13. #12
    A3 T's Avatar
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    Quote Originally Posted by Cookstein View Post
    LOL.....indeed, i am trying my best here
    Thanks mate


    TBH. I think your the only one that stuck with me in all my threads (everyone else gives up) .....lol



    I don't know why i cant get my head around doing this.


    I'm not sure what the secondary air injection is but unless its not fitted as standard then I'm sure i don't have it.....lol


    Here's a pic of my engine if that helps:





    So if i don't have SAI then its just a case of putting a T in the hose coming from the inlet manifold and running a new hose from the T the the top of the DV ?


    Now for my next stupid question....lol


    Where is the hose i need to tap into on the manifold?


    I tried to trace the pipe coming from the n249 but it goes straight into a metal pipe and losses me...lol


    Thanks again mate
    Audi A3 T sport (8l) AUM 2001..... Stage 1 Remap , Bailey DV30 , HID Headlights , LED Sidelights/Footwells , Catch Can , N249 Bypass , Tinted Windows .....

  14. #13
    Alex C's Avatar
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    do you have SAI...well from your pic i can't see the combination valve for the secondary air injection which I think is the shiny metal circle valve you can see in Wellys picture below. Its just below the black hockey puck valve on the right hand side of the engine bay



    so maybe you don't have SAI...but to make sure back to your engine bay...



    your dipstick, in front of that there is a black metal plate, bolted to the underside of that black metal plate is the N249 valve and all of its related pipe work. If you have SAI then there will also be the N112 valve on the underside of that plate. So remove that metal plate and check if you have an N112 valve hidden under there....or take a pic of it. TBH i think i can see a hint of SAI pipe work going on under there, but I'm no expert

    i have a question, the blue hose coming of the top of your DV, where is that going?
    Alex S3 AMK
    Bilstein B8s, H&R Springs, Neuspeed ARBs, Genuine 18" BBS LMs & LCR Brembos

  15. #14
    A3 T's Avatar
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    Quote Originally Posted by Cookstein View Post
    your dipstick, in front of that there is a black metal plate, bolted to the underside of that black metal plate is the N249 valve and all of its related pipe work. If you have SAI then there will also be the N112 valve on the underside of that plate. So remove that metal plate and check if you have an N112 valve hidden under there....or take a pic of it. TBH i think i can see a hint of SAI pipe work going on under there, but I'm no expert

    i have a question, the blue hose coming of the top of your DV, where is that going?

    I thought this was the n249 .....lol






    I've uploaded some more pics here so you can click them and make them big:


    http://www.use.com/0e338201a46238eac844


    The blue hose is for my boost gauge
    Audi A3 T sport (8l) AUM 2001..... Stage 1 Remap , Bailey DV30 , HID Headlights , LED Sidelights/Footwells , Catch Can , N249 Bypass , Tinted Windows .....

  16. #15
    Alex C's Avatar
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    the bit you have circled is the vacuum reservoir, the N249 pipe work is underneath the black metal plate where your dipstick is. S3's are different as they have the vacuum reservoir and all of the N249 pipework sitting on top of the engine




    you can see some of the N249 pipework sticking out beneath the metal plate (the one with the sticker on it) in your pic above




    I think the ribbed piping with the mini blue cone filter on the end is for your SAI. It looks like somebody removed the standard airbox and therefore they have had to add a mini filter to your SAI air feed. The standard setup is that your SAI and your TIP share the same panel filter in the OE airbox.

    ...your combi valve must be hidden from view somewhere...under your breather hoses and TIP maybe. That'll be where the other ribbed pipe is going...
    Last edited by Alex C; 15th June 2011 at 12:13.
    Alex S3 AMK
    Bilstein B8s, H&R Springs, Neuspeed ARBs, Genuine 18" BBS LMs & LCR Brembos

  17. #16
    A3 T's Avatar
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    I found another good guide here: Guide to removing / bypassing the N249 valve.


    But it seems that every guide i find says to mess about with the fpr


    I thought the bypass was a simple case of connecting a new hose between two parts and removing everything in-between .......lol


    I don't know if i should attempt this now as there seem more to it with the aum engine
    Audi A3 T sport (8l) AUM 2001..... Stage 1 Remap , Bailey DV30 , HID Headlights , LED Sidelights/Footwells , Catch Can , N249 Bypass , Tinted Windows .....

  18. #17
    Syvo's Avatar
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    that guide seems easy to follow just use one of the vac feeds under the inlet instead of the fpr i know on mine i have 1 behind the dip stick one to the right of that that is free then another one or two for the fpr and n249 orginal set up. will be doing mine next weekend so will fix a guide together and post it up







  19. #18
    Alex C's Avatar
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    yeah as paul said. Where he has taken the feed of the inlet manifold put a T piece in there so it can feed the DV and N112 valve instead of T'ing into the FPR line to feed the DV. Im not sure how necessary that one way valve is between the inlet manifold and N112 that he has in his guide, im not sure if Welly left a one way valve in there or not...
    Alex S3 AMK
    Bilstein B8s, H&R Springs, Neuspeed ARBs, Genuine 18" BBS LMs & LCR Brembos

  20. #19
    Syvo's Avatar
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    i will leave mine in as had fun and games last time with the 1 way valve for the brakes when did the oil catch can put stupid thing on wrong way lmao







  21. #20
    A3 T's Avatar
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    Quote Originally Posted by paul syverson View Post
    will be doing mine next weekend so will fix a guide together and post it up
    That would be good mate

    I think it would go down well on here because this thread seems to be getting a lot of hits buy not many replies, so it probably people thinking i made a guide.....lol




    I think the thing that gets me confused with the guide i posted up is......

    I'm with him up to the “copy what I've done” part of the guide but then at the end of the guide he says:


    Once all this has been done all you need to do is give the DV another Vacuum feed. The easiest way to do this is to replace the braided line going from the bottom of the inlet manifold to the Fuel pressure regulator with a new tube that has a T piece in it. And then from the T piece run a vacuum tube straight to the top of your DV. You will see in my picture below that i have two T pieces in this Vacuum line. This is because i am running a boost gauge from here aswel.


    I thought this last part was how you do the bypass by tapping in to the fpr so what was the point in all the other stuff ......lol
    Audi A3 T sport (8l) AUM 2001..... Stage 1 Remap , Bailey DV30 , HID Headlights , LED Sidelights/Footwells , Catch Can , N249 Bypass , Tinted Windows .....

  22. #21
    Alex C's Avatar
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    when he did the n249 bypass it also involved him removing the standard N112 (SAI) pipe work so all of the other stuff was replacing/simplifying that pipework first, and then he did his DV pipework (N249 bypass). But, he T'd his vacuum line for the DV into the FPR line which is not advisable.
    Alex S3 AMK
    Bilstein B8s, H&R Springs, Neuspeed ARBs, Genuine 18" BBS LMs & LCR Brembos

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    Syvo's Avatar
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    as above the picture shows how he changed all the piping between the n112 and the n249 then ran the n112 to the underside of the inlet where the orginal went from the one way valve then from the n249 he tapped into the fpr you would need to not tap into the fpr and use another existing nipple under the inlet and connect the pipe from the n249 into this then tee off to the dv.

    i currently have my boost guage in the fpr but ive not cut it just put a tee at the top so can reconect the fpr when i do this it was a temporary thing to get the boost guage working using the fpr.

    done a quick sketch in paint (looks like a kids drawings please excuse)







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    this is what will appear from under the car if you tap into the fpr when doing the n249 you have been warned







  26. #25
    Alex C's Avatar
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    ....after the N249 bypass there is absolutley no pipework going to the N249 valve, nothing. Just the electrical connection
    Alex S3 AMK
    Bilstein B8s, H&R Springs, Neuspeed ARBs, Genuine 18" BBS LMs & LCR Brembos

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    When i did mine i noticed the boost guage is T'd into the FPR line is this ok ??? or should i take it from somewhere else ???
    1999 A3 Quattro 1.8T Pics >>HERE
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    to avoid any potential problems with the fuel pressure reg its advised to take a boost gauge off the dv pipe. minimises any leaks or problems on the fpr which could at worst, mean running lean, which aint good at all.

  29. #28
    A3 T's Avatar
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    TBH... i think ill get about 4 meters of 4mm silicone hose and wait for paul syverson’s guide........lol


    I just know ill end up getting stuck half way through it and wont remember how to put it back the way it was.....lol
    Audi A3 T sport (8l) AUM 2001..... Stage 1 Remap , Bailey DV30 , HID Headlights , LED Sidelights/Footwells , Catch Can , N249 Bypass , Tinted Windows .....

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    Syvo's Avatar
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    done and dusted will get the guide sorted out monday as left lead for phone in work.

    you will only need 2m of 4mm silicone pipe
    1 tee piece
    and a big swear tin the old clips for the pipes are a pita but got them all off and sorted it all out the other guide from the vw site makes it look harder than it is if i wasnt doing a guide and the clips were easy get off would say 30mins to do it probs less.







  31. #30
    A3 T's Avatar
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    Quote Originally Posted by Syvo View Post
    done and dusted will get the guide sorted out monday as left lead for phone in work.

    you will only need 2m of 4mm silicone pipe
    1 tee piece
    and a big swear tin the old clips for the pipes are a pita but got them all off and sorted it all out the other guide from the vw site makes it look harder than it is if i wasnt doing a guide and the clips were easy get off would say 30mins to do it probs less.

    I thought you was going to be doing this saturday/sunday....lol


    Does the car feel any different ?


    Yeah those clips are a right pain in the a*s, When i changed my thermostat i noticed that the braded hose going to the plated holing the n249 was almost split. and i had to get one of them clips off to change it.....lol


    I think ill be doing this the day you post up the guide
    Audi A3 T sport (8l) AUM 2001..... Stage 1 Remap , Bailey DV30 , HID Headlights , LED Sidelights/Footwells , Catch Can , N249 Bypass , Tinted Windows .....

  32. #31
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    I sooo need to do this aswell but getting confused lol! Will just attack it and see what happens
    1.8T AUM KO3S STAR REMAP, BMC CDA, MAGNAFLOW CAT BACK, POLY BUSHED, KONI COILOVERS, PLUS MORE TO COME!!!

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    A3 T's Avatar
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    Quote Originally Posted by nixy View Post
    I sooo need to do this aswell but getting confused lol! Will just attack it and see what happens

    What part are you confused about mate?

    Have you looked at this guide and the guide i linked to in it:


    http://www.audi-sport.net/vb/a3-s3-forum-8l-chassis/122962-n249-bypass-guide-ary-engine-all-other-a3-engines.html


    If you need any more pics then let me know as i took loads when i did the bypass
    Audi A3 T sport (8l) AUM 2001..... Stage 1 Remap , Bailey DV30 , HID Headlights , LED Sidelights/Footwells , Catch Can , N249 Bypass , Tinted Windows .....

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    to be fair ive not really looked at my car etc yet as not had time lol!! Will use those uides and i should work itout lol Cheers
    1.8T AUM KO3S STAR REMAP, BMC CDA, MAGNAFLOW CAT BACK, POLY BUSHED, KONI COILOVERS, PLUS MORE TO COME!!!

    BYE BYE TO MY OLD MK4 GOLF AGU GONE BUT NEVER FORGOTTEN!!

  35. #34
    Neutral

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    Aug 2010
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    30
    worked for me , got an aum

  36. #35
    kelk11's Avatar
    1st Gear

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    Feb 2009
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    102
    I have a bam engine and I have just run a pipe from the inlet mani to top of DV, test drove no problems and it seems to have cured a boost leak, upon removing the left over pipe work there seems to be one pipe leading into another pipe near the fuel rail. do i just remove this?

  37. #36
    Alex C's Avatar
    6th Gear

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    Jan 2010
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    Lizard, Cornwall
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    you got any pictures?
    Alex S3 AMK
    Bilstein B8s, H&R Springs, Neuspeed ARBs, Genuine 18" BBS LMs & LCR Brembos

  38. #37
    kelk11's Avatar
    1st Gear

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    Feb 2009
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    102
    I went outside to get a pic, all sorted i was just being thick.

 

 

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