Author Topic: Guide to removing / bypassing the N249 valve.  (Read 60160 times)

Offline Mr_Orange

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Re: Guide to removing / bypassing the N249 valve.
« Reply #50 on: 14 January 2013, 21:14 »
Bringing this back from the dead - I know, I know... :rolleyes:

Just wanted to clarify (as some of the later posts are querying), bypassing the N249 won't affect emissions. BaV was talking about removing the secondary air pump, which is used to bring the catalytic converter up to temperature when cold starting. Removing this pump won't do much for performance (probably nothing actually) but will tidy up the engine bay at the same time as affecting emissions. If you remove it, make sure you put it back on before getting your car MOT'd :wink:

On a side note - I'm thinking of bypassing the N249 on my AUM to see what all the fuss is about - I assume this kind of "modification" needs to be declared to the insurance company? Before anyone starts having a go, I'm not the sort of person that wants to hide anything from them in order to save myself a few quid, I am genuinely unsure as to whether this would need to be declared. After all, it's bypassing something that already exists, not adding something fancy/expensive. Cheers.

Removing SAI does not affect MOT emissions testing dude.  Ours has now passed 2 MOTs without it.........  Its also passed 3 without the N249  :kiss:
« Last Edit: 14 January 2013, 21:16 by Mr_Orange »


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Offline tomparkes

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Re: Guide to removing / bypassing the N249 valve.
« Reply #51 on: 15 January 2013, 09:07 »
Hmm, interesting... I've heard quite a bit about this screwing with the emissions, but maybe it's just dependent on the engine/model. Or maybe what I've been told is complete rubbish! Oh well! :rolleyes:


2004 1.8T AUM | CM Silicone Hoses | Pipercross Panel Filter | Smoothed Stock Airbox | Weitec Ultra GT -40mm Springs & Shocks | Genuine 18" Anni BBS RC's | Anni GTI Front Grill Badge | Sharan Rear Badge | Polo Stubby Aerial | Black Centre Console

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Offline NegoGti

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Re: Guide to removing / bypassing the N249 valve.
« Reply #52 on: 21 January 2013, 18:24 »
Ive just done this on my AUM It works so good much much better then before mine was broken btw thank u so much for this  guide

Offline Nino

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Re: Guide to removing / bypassing the N249 valve.
« Reply #53 on: 18 April 2013, 22:42 »
I have just done this mod and I too have noticed the car runns sooooo much better problem is im getting flutter  :undecided: see my topic here...
http://www.golfgtiforum.co.uk/index.php?topic=252504.0
VW Car history
Mk3 1.8 GL - Silver - 5 door
Mk4 1.8t - Silver - 3 door
Mk4 R32 - Black - 5 door
Mk5 GTi - Black - 5 door
Mk4 R32 - Deep Pearl Blue - 3 door
MK6 2.0 TDI - Graphite Blue - 5 door
MK7 GTD - Solid Black - 5 door
MK6 GTi Edition 35 - Candy White - 3 door

Offline D1andonlyantman

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Re: Guide to removing / bypassing the N249 valve.
« Reply #54 on: 08 November 2013, 17:12 »
So, I've recently bought a gti 180 and was just wondering if a few years down the line you still swear by this mod being the way to go?

Thanks
MKIV AUQ - RamAir Induction Kit, Forge007p, (Custom Exhaust, Decent TIP, N249 Bypass and remap coming soon)

TRASHED BY SOME BELLEND WHO CANT DRIVE

Replaced with Leon Cupra 225, RamAir CAI, Forge 007p, Badger5 TIP, N249 bypass, Scorpion Decat and Catback, R-tech remap pushing approx 275bhp :-)

Offline tallpaulr

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Re: Guide to removing / bypassing the N249 valve.
« Reply #55 on: 10 November 2013, 09:22 »
I've not got a Dump Valve fitted to mine where would the pipe go instead?

Offline Nino

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Re: Guide to removing / bypassing the N249 valve.
« Reply #56 on: 11 November 2013, 09:38 »
I've not got a Dump Valve fitted to mine where would the pipe go instead?

Straight to the inlet manifold mate :)
VW Car history
Mk3 1.8 GL - Silver - 5 door
Mk4 1.8t - Silver - 3 door
Mk4 R32 - Black - 5 door
Mk5 GTi - Black - 5 door
Mk4 R32 - Deep Pearl Blue - 3 door
MK6 2.0 TDI - Graphite Blue - 5 door
MK7 GTD - Solid Black - 5 door
MK6 GTi Edition 35 - Candy White - 3 door

Offline WadGTI

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Re: Guide to removing / bypassing the N249 valve.
« Reply #57 on: 11 November 2013, 13:33 »
So, I've recently bought a gti 180 and was just wondering if a few years down the line you still swear by this mod being the way to go?

Thanks

I have had it done for a few months now. Can't say I notcied a big difference. It certainlly doesn't surge when removed.

I would say do it if you can. You can always put it back together anyways. I did it on my AUQ, so if you have problems, give me a shout.

Offline D1andonlyantman

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Re: Guide to removing / bypassing the N249 valve.
« Reply #58 on: 13 November 2013, 17:19 »
I just thought I'd add to this and say this mod is a requirement for a stage 2 remap by r-tech, so that's a enough of a recommendation for me :-)
MKIV AUQ - RamAir Induction Kit, Forge007p, (Custom Exhaust, Decent TIP, N249 Bypass and remap coming soon)

TRASHED BY SOME BELLEND WHO CANT DRIVE

Replaced with Leon Cupra 225, RamAir CAI, Forge 007p, Badger5 TIP, N249 bypass, Scorpion Decat and Catback, R-tech remap pushing approx 275bhp :-)

Offline Mr_Orange

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Re: Guide to removing / bypassing the N249 valve.
« Reply #59 on: 26 November 2013, 20:09 »
Just passed another MOT without them
Tidier engine bay and a few less potential vacuum leaks too
:cool:


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