Been thinking of bypassing my N249 for a while now after reading up on alot of benefits, its inexpensive and might help abit with my boost surging.

After browsing the interweb some people actually leave the little pump thing plugged in but just cap off the pipe instead of using resistors, is that a cowboy way of doing things or does it work?

Another thing that crops up is where to attach the vac line. FPR line or the inlet?

Been thinking of bypassing my N249 for a while now after reading up on alot of benefits, its inexpensive and might help abit with my boost surging.

After browsing the interweb some people actually leave the little pump thing plugged in but just cap off the pipe instead of using resistors, is that a cowboy way of doing things or does it work?

Another thing that crops up is where to attach the vac line. FPR line or the inlet?

 

Here is my guide if it helps dude.

 

http://www.briskoda.net/forums/topic/155472-how-to-remove-delete-sai-n249-and-n112/

 

You may benefit from no cell light if leaving plugged in and capped,  but personally the best way is rip it all out and then you are clean. 

Not a cowboy approach though.

 

attach the vac line  to inlet manifold not FPR.

Cheers bowders. Yours is one of the guides ive checked out. Dont really wanna remove it all incase theres any issues. Theres threads ive read that mention the ASR not functioning right afterwards. I understood the ASR to work via the throttle so if the throttle closes via the ASR the dv should still work. Dont really want to loose my ASR function you see

Before you do anything take a look here; http://www.audizine.com/forum/showthread.php/554859-N249-delete-Why-you-should-not-do-it

Before you do anything take a look here; http://www.audizine.com/forum/showthread.php/554859-N249-delete-Why-you-should-not-do-it

Game changer. I hope i havent opened a can of worms here.

Theres so many threads for the mod and thats the first ive seen against it

Before you do anything take a look here; http://www.audizine.com/forum/showthread.php/554859-N249-delete-Why-you-should-not-do-it

 

forget that thread 

 

it proves nothing but 5 pages of discussion not proving the point one way or another.

 

The experience is with users in a car that has removed and benefited from the delete  

Something i will get done once the weather is better

Seems some advice against it however all the info I've read against it in this and another thread on vw vortex are from American forums. I would have thought our uk cars would be mapped differently from factory. Does any other manufacture use a similar system to the n249 ? I may be wrong but I thought dump valves on turbos where fitted to reduce compressor surge and allow quicker spool up after gear change. How would opening the DV with the n249 system reduce the air intake track at low load situations ?

I'm currently assembling the parts to do the SAI, N249 and n112 delete so before I do it I'd like to know a bit more info, preferably from someone who maps the 1.8t. When I've done the deletes and sorted my decat blowing issue it's going for a remap at shark or r-tec.

I also had planned on doing this mod until I read that thread on the Audi board. As far as I know, they only recirculate the boost pressure. I didn't realise they also stayed open with light throttle.

I can`t say it`s better or not because I didn`t delete n249, but after replacing some broken hoses under the inlet manifold including in n249 system I really have no problems with boost pressure or turbo surging. So I don`t see the point of deleting something which in my opinion works perfectly.

I think the main thing is that some people didn`t get to bottom of boost or surge problems and started pulling everything out in hope it will resolve ongoing issues.    

Edited 7 January, 201412 yr by Gonzaga

Be interesting to hear from someone who knows this engine well

Removed mine a few years back pre remap and not caused any problems, did it same time as SAI pump and N112 removal and catch can fitting, had surge problem after map but once repaired a couple of cracks and splits in coil pack loom surge went, have since replaced coil pack loom back to ECU car runs and idles great now.

Resistors stop fault code for N249 and N112 but not SAI(on mine on anyway) have removed relay as well but error code still there for SAI.

Be interesting to hear from someone who knows this engine well

 

 

You'll be waiting a while round here lol

Wonder if you can remove all the sai pipes but leave the pump in place and cap that off hmmmm

If you don`t map SAI out it will trigger "Secondary Air Injection Pump - Incorrect flow detected" error. This is caused by no flow of air through the combi valve which wideband lambda detects in first 2min. 

Well out of curiosity I refitted a known good N249 today (still with N112 and SAI deleted).

 

had to make some adjustments to pipework to compensate for no N112.

 

After a quick test drive , car was very smooth to drive and DV sounded a little different and more prominent off throttle. It did feel a little less response but too small a trip to really tell. Will test again tomorrow as see.

 

TBH i expect to be removing it again..... 

Ive got everything ready to bypass it but the weather has been cack

Done. Even managed to snap my dipstick tube :(

Those dipstick tubes are crap! I replaced some breather pipes on Saturday and managed to break mine

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Done. Even managed to snap my dipstick tube :(

 

Easy done buddy , the dipstick tube get' brittle with age and most of us that have done this mod have ended up breaking it. Cheap to replace

Already ordered one off ebay for £4.50

One thing i will say is the n249 bypass has certainly improved some issues i was having.

I've run the delete on a few cars now never had any ill effects, just done it to my latest as well, the best by is no vac box over number 4 coil, worth it just for that alone

Mine seems to be less jerky when coming back on throttle and the dv sounds different too.

Yeah the dv sounds different and the engine feels more torquey and smooth. This could be in my head

Brief update folks,

 

Curiosity got the better of me having deleted all my stuff few years back and with the recent talk of N249 refit

 

So I refit only the N249 last weekend

 

I have to plumb up some piping to refit as it is normally all connected with the N112 for the SAI.

 

So this is what it started with

 

 

removed this lot

 

 

looped in a hose where the joiner was

 

 

Pic here of where the canister is connected  

 

 

so then just connect short pipe to inlet manifold where DV hose was and connect the other pipe from N249 to DV

 

A quick run around the block showed no issues , so I left in for a few days

 

Results were.

 

Good points

 

- Very smooth running as apposed to initial reason to remove in first place(although maybe as SAI and N112 still removed they were the original culprits)

- improved fuel consumption(noticeable over the few days) 

- feels slightly smoother on light throttle, but not major

 

Bad pints

 

- Car feels slower, considerably pick up between gear changing

- DV response seems slower in general and in spirited driving

- DV noise not as good

 

Conclusion

 

Removed it after 5 days as definitely not for me

 

Although MPG was improved, that is probably more lightly that the car ran slower  

There is a lot of talk about better part throttle driving , but i just did not get that at all. But most of that talk is with a std running car and std DV, so perhaps my state of tune works bet as i have it. So it is staying with all deleted.....