n249 bypass chatter

[james walker]

can anyone explain why you get chatter when n249 bypass is done? feels stronger with the bypass done, but chatter isnt good for turbo life is it?

any ideas why please...leon cupra facelift btw

cheers

 

[DannyC87]

what diameter hose have you used for your bypass?

 

[james walker]

not sure danny... fits over the dv nipple fine and inlet manny nipple, so whatever diameter they are?

 

[DannyC87]

might be that it is too thin so the DV isn't opening properly?

 

[james walker]

hmmh, followed the guides on here for diameter pipework....

could possibly try some thicker diameter pipe, same inside diameter but thicker wall?

have you bypassed yours danny?

 

[TubbyTwo]

mine is bypassed, used 5mm ID silicone hose, forge 007p with yellow spring and mine as far as i know doesnt chatter.

might connect it back up and see if its any different.

 

[DannyC87]

hmmh, followed the guides on here for diameter pipework....

could possibly try some thicker diameter pipe, same inside diameter but thicker wall?

have you bypassed yours danny?

mine is bypassed yes. 5mm silicon hose straight from intake mani to dv. Could also be the spring in the DV is too stiff?

 

[Murdered LCR]

Mine chatters back through the tip and out the hks mushroom I have it's fine I have removed everything from the n 249 some people put in t bits when you don't ant thing only thing I have left is the grey block and the connector block harness thing can get pics later if you want , there is a difference between flutters ie good and bad remove your pipe on top of the dv and rev it on the spot sounds the tits but it's not good for it

 

[james walker]

mine is bypassed yes. 5mm silicon hose straight from intake mani to dv. Could also be the spring in the DV is too stiff?

apr r1 valve so diaphragm based, although when i had forge 007 it did it then aswell, ive done the bypass twice now and same reuslts both times.

could vac tubing be too weak and collapsing under vac, and or t-piece restricting.

iirc its 4mm tubing, 4mm t piece

on my lc, ive bypassed as follows

intake manifold nipple to dv nipple, t pieced in the middle to the fpr.. 2 vac sources that the dv went to and n249 reservoir are blocked up with bolts, no air leaks there..

any ideas?

 

[james walker]

Mine chatters back through the tip and out the hks mushroom I have it's fine I have removed everything from the n 249 some people put in t bits when you don't ant thing only thing I have left is the grey block and the connector block harness thing can get pics later if you want , there is a difference between flutters ie good and bad remove your pipe on top of the dv and rev it on the spot sounds the tits but it's not good for it

bearing in mind i have leon cupra not cupra r??

 

[JamJay]

remove your pipe on top of the dv and rev it on the spot sounds the tits but it's not good for it

What pipe are you on about? The vacuum hose or the hose from the charge pipe?

 

[Murdered LCR]

Ah lol fair enough it's a little different as yours are under the Mani but still the same kind of thing haven't got pics of my mates car that I done

 

[adam cupra 20vt]

I don't get chatter on mine with N249 bypass.

 

[Murdered LCR]

The small 5mm one on the top of the dv the one that comes from under the mani

 

[james walker]

What pipe are you on about? The vacuum hose or the hose from the charge pipe?

vacuum pipe from top of dv

 

[james walker]

I don't get chatter on mine with N249 bypass.

any pics to yours done adam? or how you did to compare, what hose you used etc?

 

[JamJay]

vacuum pipe from top of dv

Ahhh ok. How does this change the sound of the DV then? Not that I will run my car like it.

 

[LEE69]

Mines comes through the HKS mushroom too.

 

[adam cupra 20vt]

any pics to yours done adam? or how you did to compare, what hose you used etc?

Mine comes from an extra vaccum take off on the inlet manifold that I made and goes straight to DV using 4mm internal silicon.

Before that it was T'd into FPR and was excatly the same.

You sure its not the DV you can hear through the filter? thats a little different to chatter when the DV is not going off.

 

[Murdered LCR]

Proper flutter try it once sounds the nuts lol