07-10-2013, 04:43 PM
Hi all,
Been doing a bit of data logging just trying to smooth the last few lumps out in my GTi-6 throttle body setup, before moving on to bigger cams, injectors etc.
Where do you guys aim in terms of Idle Air fuel ratio?
If I connect up the Lambda sensor, obviously it sits at 14.7:1 as measured with my wideband - but it idles like crap there with no ICV, missing and stumbling a bit.
With the Lambda disconnected @ 3.0 bar fuel pressure and my chip wizards mapping I see around 12 - 12.5:1, it idles much better but still the odd stumble and pretty "fuelly" smelling.
If I take a little fuel out and shoot for 13:1 it idles smooth as silk, I can adjust the rpm down to 850 and no issues... but it still feels pretty rich.
Any input?
Ta,
JP
Been doing a bit of data logging just trying to smooth the last few lumps out in my GTi-6 throttle body setup, before moving on to bigger cams, injectors etc.
Where do you guys aim in terms of Idle Air fuel ratio?
If I connect up the Lambda sensor, obviously it sits at 14.7:1 as measured with my wideband - but it idles like crap there with no ICV, missing and stumbling a bit.
With the Lambda disconnected @ 3.0 bar fuel pressure and my chip wizards mapping I see around 12 - 12.5:1, it idles much better but still the odd stumble and pretty "fuelly" smelling.
If I take a little fuel out and shoot for 13:1 it idles smooth as silk, I can adjust the rpm down to 850 and no issues... but it still feels pretty rich.
Any input?
Ta,
JP
JP