Lean Fuel Issues after 4k rpm on Revo Stage 2+ Ed30

[illyun]

Damn... you've ruined my evening Mat    I get it now.  Only one end of the pipe had an O-Ring and that was already on there...  Well thanks for trying Jonny  and thanks for nothing Mat 

[MAT ED30]

Damn... you've ruined my evening Mat 

sorry mate but its defo worth a check incase they are not on correctly

[illyun]

Damn... you've ruined my evening Mat 

sorry mate but its defo worth a check incase they are not on correctly

Yes, I will ask JKM to check them... I strongly suspected the S3 install as the problem occured quite soon after that job. 

[MAT ED30]

good luck illyun and i hope u get it sorted quick   

[illyun]

good luck illyun and i hope u get it sorted quick   

Thanks   

[john_o]

brilliant thread  Im gonna stop quoting on forums 
nice one jonnyc , although if this is the issue then how does that translate into lean mixture ? lost boost I would expect over rich ?

[illyun]

Right, I've got the red pipe in my hand and BOTH.. sod it.. let me get a piccy up.  Heres what I've got:

 

Nice Beetle by the way 

Thats my 4 year old daughter's 'daily drive'    Its got barnstorming acceleration and could probably keep up with your Ed30 Jonny - well upto its top speed of 2mph   

Haven't really thought much in the way of modding yet - maybe put a Milk Float battery in it... 

[jonnyc]

I still think there is a problem here, look at the pics to see what I mean..

This pic shows the S3 hose which one end (GREEN) pushes over the intercooler take off (RED 2nd pic) and is secured with a hose clamp. The other end (RED) has the hose connector on, with no o-ring, not that I can see anyways.. This end pushes into the turbo intake pipe on the driver side of the engine bay and is secured with a spring pin.




I still think that there is no o-ring on that connection which would cause a problem..

brilliant thread  Im gonna stop quoting on forums 
nice one jonnyc , although if this is the issue then how does that translate into lean mixture ? lost boost I would expect over rich ?

I can't really explain that, but I agree that it would be trying to over compensate with the fuelling, it is running silly pressures in the fuel system, this could well have something to do with it.. As to why its ending up lean I have no idea, it could infact be that its just getting pre ignition because its actually running stupidly rich for a moment. Over rich conditions can also cause pre ignition, especially in high compression engines..

I don't pretend to be an engine builder but it all kind of links up together, just throwing some ideas about..

I still think it would be worth having JKM check that connection on the IC hose..

[RedRobin]

I still think it would be worth having JKM check that connection on the IC hose..

....Good idea. There's no reason for JKM to have checked these connections already and I know that Jim is familiar with how the S3 i/c goes into the GTI.

IIRC, the alu ends have to be changed because the S3 ones don't fit.

[Phil Mcavity]

Nadeem, i was under the impression from jkm, that your car is making the horsepower no problem on the rollers, just not very smooth getting there or idleing?. How can the intercooler potentually cause this if she shows no signs of overheat to cause incorrect temp readings to the ecu?.

[tony_danza]

It won't be the intake temp, Phil, it'll be pressure fluctuations.

The requsted boost vs actual received and any slight variations because of leakage will cause the ECU to be constantly making adjustments to try and compensate, making it choppy, as Jonny said.

[chungster]

brilliant thread  Im gonna stop quoting on forums 
nice one jonnyc , although if this is the issue then how does that translate into lean mixture ? lost boost I would expect over rich ?

exactly my view also...

if the IC install is causing a slight air leak, it will make it run rich rather than lean, as the MAF would have seen a level of airflow greater than that at manifold point, but fuel level would be per MAF level.

HOWEVER,

if it was running rich, and the O2/Lambda sensor in the exhaust DP would know this, it would then try to pull fuel trim to lean off the mixture to compensate.

So, potentially, I suppose (and I'm no expert) it could cause the problems being experienced.

But I would have thought it would be a minor correction, and not big enough to cause such a dangerous lean mixture being shown?? All very strange.

[Phil Mcavity]

It won't be the intake temp, Phil, it'll be pressure fluctuations.

The requsted boost vs actual received and any slight variations because of leakage will cause the ECU to be constantly making adjustments to try and compensate, making it choppy, as Jonny said.

i seee

[MAT ED30]

Jonny if you look at the pic of hoses I put up on the right hose in the pic it's got a jubilee clip on the bottom and at the top it's got a plastic cover over the top of it and if you look close near the top u can see the black o ring going around the top of it.

[MAT ED30]

just had a look at the s3 hoses on mine and they 1000% have a green o ring at the top