please watch this video and you will get an idea how my yellow spring 007p sounds currently.

@ go at 1:32

It never used to do that, I havent plugged in VAG COM yet. Car is running Revo2 but cant remember settings.

any thoughts?

Edited 13 December, 201213 yr by theo_k

Just the air going back over the spinning compressor wheel the wrong way, causing compressor surge. Happens when you run either no dv or too strong a spring from my experience.

It can damage the turbo.

Edited 14 December, 201213 yr by Matt.

http://www.youtube.com/watch?v=28FReT0RBIs

i think its the same guys.

Jeezus. Crazy indeed. Those kingpins looked as wobbly as hell.

Just the air going back over the spinning compressor wheel the wrong way, causing compressor surge. Happens when you run either no dv or too strong a spring from my experience.

It can damage the turbo.

spring is yellow... i updated to Revo2 this summer, the car seemed to be running better and slightly faster. I think, I am not sure, when I put my foot down on 2nd gear the DV opens up and after say 4500rpm I think I can hear air going in or leaking from somewhere... I checked out the intercooler hoses and connections but is all ok, I honestly dont know what the heck is going on. In terms of pressure I still did not try VAG COM as I dont know of a safe place near Wimbledon to test it on 3rd gear and log 115/118

just an update, I logged the car with VAG COM 032 block, lamda values close to 2 which means the AFR close to 29!!! instead of 14. N249 as an error code, therefore I believe this is caused by a split silicone hose somewhere... or it might be that 007 is stuck, which I really doubt!

Is that reading at idle or on boost? TBH I'd say thats just the reading going off the scale if you are taking a reading from the standard narrowband sensor.

I've not done any work on tuning VAGs but 29 on boost would be melting things. Usually looking for 14.5-15 on idle and 11.0-12.0ish on boost depending on the setup

I took the readings with my laptop connected to the car's ECU (VAG COM software), I know the readings could not possibly be real for the reason you mentioned. Therefore there is a leakage somewhere in the air system (Intercooler, manifold, phenolic gasket etc... )

Do an N249 bypass, as the N249 will open the dv upon acceleration if it thinks there is too much boost pressure

Do you mean that chatter sound? Because I get that occasioanlly but I got it after replacing the n249 (the one on the tip)

That's the N75 valve on the tip. N249 sits on a platform on the cam cover.

Both wrong! The N249 sits on the underside of the Pierburg vacuum plate at the front of the inlet manifold, along with the N112.

Try fitting a new standard DV instead of the Forge + yellow combo.

That came out for some reason, it did not break though! When I put it back in the car was working ok with no jerking around in idle. The N249 error though still comes up after I tried to get rid of it a few times through VAG COM. Now I am out of ideas. My ? (lamda )sensor from 031 block is reading 1 and when I accelerate is reading 0.9 etc which is ok, when I lift my foot form the accelerator is reading 2!!! Which means the AFR is 28-29.

Any thoughts?

I was thinking of this

along with the gold valve under the pipework. This is what I removed from my Ibiza, and that is on the cam cover next to the vacuum box.

Edited 20 December, 201213 yr by Matt.

Yeah it's a different set-up on the MkI RS AUQ engine. Only the vacuum reservoir sits above the cam cover on our engine.

Ah I see, thanks for the information as I will be removing mine later! Do you have a picture of it on our engines bud?

what about this?

http://www.ebay.co.uk/itm/1-8T-20v-Turbo-N249-N75-SAI-Bypass-for-Ibiza-Leon-Cupra-Golf-Polo-TT-A3-A4-VAG-/281029574201?pt=UK_CarsParts_Vehicles_CarParts_SM&hash=item416eaafe39

Edited 20 December, 201213 yr by theo_k

Sorry, I meant N75 haha!

I was thinking of this

along with the gold valve under the pipework. This is what I removed from my Ibiza, and that is on the cam cover next to the vacuum box.

denver... the last dinosour, hes my friend and a whole lot more!

Sorry..

just to close this in case someone benefits from it in the future. Around summer I decided to fit my self the Phenolic spacer. I did it ok but I was sort of pulling and pushing the N249 around a lot. So right under the manifold there is a small 4mm tube that goes to the N249. That got cut somehow quite slowly. I only discovered this 2 days ago as I kept looking around and moving the tubes around to see if anything was off, that the naked eye could not see, and it was indeed. So I bought a 4mm diameter tube, replaced it and everything now is fine, no loss of power, no chatter no nothing. The car is back to its original self, nippy and fast.