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

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