N249 Bypass guide LCR

[Dave_Cupra88]

Started doing this yesterday. Don't know if I'm just unlucky, but it's taken well over 20 minutes so far. Those b**tard clips didn't want to come off!

Should I be able to suck air through the pipe that leads to the inlet manifold? I tested this as soon as I took it off the N249, before I'd even done the bypass. The pipe from the DV was fine when I connected that.

Also, does anyone know what that white rectangle of plastic on the black tray underneath the windscreen wipers is for? I dropped some pliers on it and they made a small hole. Does this matter? I know the black tray is hollow, but can't see that it really goes anywhere.

Cheers,

Dave.

 

[Mikeey]

I've read all 16 pages of this thread and I can see the benefits which some people experience by doing this bypass, but how are they actually achieved?

Am I correct thinking, when N249 is bypassed, hot air isn't recirculated back into the turbo, which helps keep the density of the air therefore producing better acceleration response due to fresh charge being drawn in?

I just want to work out how it all works and why, before I do the bypass.

Cheers, Mikey.

 

[DuamoLCR]

Just done this very good easy to follow guide took 10 minutes thank you


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[Sean886]

http://www.ebay.co.uk/itm/3306716391...84.m1497.l2649

Then you need a plastic 6mm at each connection, t piece like so

http://www.ebay.co.uk/itm/2706979116...84.m1497.l2649


I bought this stuff. Have I bought the wrong stuff?!

 

[Sean886]

I think I'm right in thinking I can run a 4mm hose from the top of the standard dv to the inlet manifold?

Sorry for the newb responce!

 

[Sprogpole]

I've read all 16 pages of this thread and I can see the benefits which some people experience by doing this bypass, but how are they actually achieved?

Am I correct thinking, when N249 is bypassed, hot air isn't recirculated back into the turbo, which helps keep the density of the air therefore producing better acceleration response due to fresh charge being drawn in?

I just want to work out how it all works and why, before I do the bypass.

Cheers, Mikey.

No, it’s not.

People do it to eliminate places that are common for vacuum leaks and to tidy up there engine bay.
Also, in the stock setup the ECU controls the DV function, so it recirculates boost pressure when you let off the gas, need traction control and to protect it’s self if something goes wrong.

When the bypass is done, it means that the only time the DV opens is when you let off the gas sharply. This means better response times and you’re more connected to what’s happening.

 

[Sprogpole]

Also, does anyone know what that white rectangle of plastic on the black tray underneath the windscreen wipers is for? I dropped some pliers on it and they made a small hole. Does this matter? I know the black tray is hollow, but can't see that it really goes anywhere.

Cheers,

Dave.

It's the cover for your VIN plate

 

[LCR]

Just done this in 4 minutes with a shitty torch thanks to this guide! Thanks mate, time to give it a blast!

 

[Eric87]

This version (BAM/AMK) looks by far the easiest to do! I'm going to attempt it when my 4mm vac hose arrives as I'll just run the hose from inlet mani to DV. Then leave the rest unplugged/Unbunged? Is that correct?

Thanks

 

[LCR]

Yeah that's it mate, so easy!

 

[Eric87]

Got my 4mm vac hose, but accessing under inlet manifold looks really tight, any tips?

 

[nd-photo.nl]

Take it off First try to remove the bracket for the n249

 

[Eric87]

Take the inlet manifold off? Haha I wouldn't trust myself. How hard is it?

 

[LCR]

 

[Eric87]

Yea I suppose that makes more sense, so do I need 4mm or 5mm hose connector? This guide says 5mm hose connector and 4mm hose. So that it seals better?

 

[LCR]

Yes mate that's right, nice tight fit


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[Eric87]

Ok thanks, hopefully do it at some point this week. I've seen people totally delete and remove a lot of the other hoses/boxes too. Is this necessary? I do think it looks a lot tidier also. But because of a million different guides Im confused AS to what can be removed, all I remember is that I still need to leave it plugged in.

 

[LCR]

Il Post a picture soon of what you can remove, but once you do the delete, it'll be clear what you can get rid of, does look a lot better


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[mattyholmz89]

Sorry to resurrect this thread just ordered my 4mm hose and connector from ebay I'm just wondering what you can remove from it though because I want it to be nice and clear I have seen a few lcr with no sign of this horrible black box =(

 

[shanky77]

Just done this on mine thanks to this guide and the difference is really noticeable

Throttle response is much sharper and there seems to be less hesitation between gear changes.

Would recommend this cheap and easy mod to anyone thinking about doing it