n249 bypass chatter

[james walker]

possibly.. sounds very different to unbypassed.

also dosnt do it all the time, intermittant chatter.

ive a spare port under the inlet manny since pcv removal on catch tank install, so youve run vac line from manny strait to dv then fpr to port under manny it uses for oem? im wondering if the pipe and tee are causing the dv to open sometimes and not others?

 

[james walker]

Proper flutter try it once sounds the nuts lol

?????

 

[adam cupra 20vt]

possibly.. sounds very different to unbypassed.

also dosnt do it all the time, intermittant chatter.

ive a spare port under the inlet manny since pcv removal on catch tank install, so youve run vac line from manny strait to dv then fpr to port under manny it uses for oem? im wondering if the pipe and tee are causing the dv to open sometimes and not others?

Yep straight to DV from manifold

The flutter without the vaccum pipe on DV is wastegate chatter because the DV has no vaccum to open it.

 

[james walker]

yeah.... its got to be something to do with the bypass, as unbypassed the dv sounds normal..tssssh, with bypass it kindof goes caatchhh, stalling sound... crap description but all i got!!

 

[adam cupra 20vt]

Does it only do it on low boost and DV opens all other times?

 

[ibizacupra]

what spring?
what size pipe
kinked?
too long?

5mm i use, direct from mani to dv.

 

[james walker]

apr r1 diaphragm valve bill, 4mm iirc pipe, 4mm t piece from fpr

i may use the spare vac source from inlet manny and run to dv.

too long??? surely it can only be one length?

 

[james walker]

Does it only do it on low boost and DV opens all other times?

yea i guess it does more on low boost, high boost seems ok, but does it sometimes then aswell

 

[adam cupra 20vt]

yea i guess it does more on low boost, high boost seems ok, but does it sometimes then aswell

Oh, if it only did it on low boost I would say the diaphragm was to tight but if it also does it on higher boost I don't know

You prob get pressure loss in longer lengths?

 

[james walker]

did it on forge valve aswell adam... so not dv issue i would say.

maybe diameter of pipework, and the tee causing a restriction..

 

[adam cupra 20vt]

My pipe is 4mm and T is 6mm

I don't really know as mine doesn't do it, it does make a noise through the filter but its the DV echo and not chatter.

 

[james walker]

you dont use the t now though yeah?

any ideas on the diameter of the vac nipple under inlet manny that is used for pcv vac connection?

 

[adam cupra 20vt]

you dont use the t now though yeah?

any ideas on the diameter of the vac nipple under inlet manny that is used for pcv vac connection?

Yeah your rite sorry it has no T but when it did it was 6mm and there was no difference.

Is that one of the 2 middle ones? I think there about 8-10mm?

 

[james walker]

the one to the left of the nipple for fpr...

no good using that then of its that big is it, be too large for dv top diameter.

 

[adam cupra 20vt]

The bigger ones in the middle? there are 2 larger ones beside each other and 2 smaller ones near the FPR?

They are pretty big so possibly not use one of them without a reducer.

 

[james walker]

yeah, i think its a large one tbh...

anyways, fcuk knows what this chatter is then eh.

 

[JamJay]

Proper flutter try it once sounds the nuts lol

I'm scared in case it hits limp mode

 

[DannyC87]

it is likely to be because you are sharing the vacuum source James. Use your spare vac source on the inlet mani for a hose straight to the DV. Use the shortest route possible.

 

[james walker]

sharing the source with what danny... the fpr? via the t piece...

ill try some 5mm pipe from under manny to dv, then fpr back to where it was.

no idea the size of the vac port like.

 

[LEE69]

yeah, i think its a large one tbh...

anyways, fcuk knows what this chatter is then eh.

Only get mine at low throttle.