N249 bypass.

[paulos44]

Did the N249 bypass yesterday using 4mm ID 8mm OD silicone tube between the inlet manifold nipple and DV valve. I am just wondering whether i should have used something more substantial to cope with the obvious vacuum pressure which will occur, such as 10mm OD.
What have other people used ?

 

[RichyH]

All the the bypasses ive seen just have the 4 & 8mm hoses yeah, But another question is this worth doing? I've got the forge DV on already and the hoses ready, it seems to be the thing to do on the 1.8T engines, but what's the use in it?


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[paulos44]

Well ive done it basically on the recommendation of this as well as other owners clubs. Was also recommended by the company who will be doing the Stage 2 remap in a couple of weeks....

 

[tom w]

I've always used 3mm hose when doing the bypasses
As for 'is it worth doing ' I'd say yes as you'll remove the chances of the ECU controlling the DV and dumping when it's not wanted or needed

 

[ibizacupra]

Did the N249 bypass yesterday using 4mm ID 8mm OD silicone tube between the inlet manifold nipple and DV valve. I am just wondering whether i should have used something more substantial to cope with the obvious vacuum pressure which will occur, such as 10mm OD.
What have other people used ?

larger pipe wont help with vacuum will it.
so long as pipes rigid enough to not suck flat from vacuum it would work fine

 

[RichyH]

I've always used 3mm hose when doing the bypasses
As for 'is it worth doing ' I'd say yes as you'll remove the chances of the ECU controlling the DV and dumping when it's not wanted or needed

Ok, cheers for explaining


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[paulos44]

Well now, as well as the usual sound from the cone filter when lifting off, I am hearing a substantial "click" noise. It sounds just like the DV valve shutting abruptly......could it be this does anyone know ?

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[paulos44]

This morning, as well as this heavy click noise, I have also had the CEL come on......wish I had left things well alone now.....

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[DrewCole]

Can't you just put it all back how it was?

 

[paulos44]

Will see what's what.....I cut through a few of the original pipes.........

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[DrewCole]

Most guides I've seen always tell people to cut through the hoses rather than taking some time to remove them from the underside of the mount plate and hard pipes.

You will be able to pick up some vacuum hose to replace that which has been cut if needs be.

Did you leave the N249 valve on the mount with the plug left connected, or remove it and put a resistor in the plug end?

 

[paulos44]

I left both valves on and plugged the connectors back in.....

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[DrewCole]

I left both valves on and plugged the connectors back in.....

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That seems to be the best way, one thing you could do is check the resistance on the N249 valve if you have a multimeter?

Think the manual suggests it should be between 27 - 30 ohms, anything less would suggest the valve isn't working as it should.

 

[paulos44]

Ok will do that in the morning......at bloody work till 9pm.....

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[paulos44]

Well the fault code turned out to be the MAF sensor again so ive started a new thread.