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911st 911st is offline
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Join Date: Jan 2004
Location: Sacramento
Posts: 7,269
It would be interesting to set CO as fat as possible but not so fat that the Lambda system can not pull it back its goal AFR. Then with accel we would get our accel fuel and some additional up top.

Many run without the O2 plugged in so the Lambda dose not mess with the AFR's and then if running more boost, set the CO at idle around 3-3.5%.

For what it is worth the C2 Turbo dose have accel fuel provided by the Lambda system but only for a very short while when cold. The O2 however dose not have anything to do with this function. It would be interesting to make a simple system to trigger this when additional fuel is needed using an rpm or smart switch of some type. I believe that all that has to happen is ground one lead going to the enrichment module.

One of the weaknesses of a CIS system it is subject to un-equal fuel flows over time from age and contamination. Thus, one might think they are running 11.5AFR on boost but they could have a cylinder or two running 13/1 and the rest at 11.3 or something. It is good to do a fuel quantity test to ensure even fuel distribution.

When you go to the dyno, might also make sure you have a recent or new clean air cleaner. If they will allow you, you might try adjusting your AFR w the O2 unplugged to about 13.5 (max tq is at about 13.2 on a flat 6). Then plug the O2 back in and see if the motor pulls you back to the high 14's. If this works it should help with your off idle acceleration and fuel with the boost turned up.

Sorry, got carried away.

Last edited by 911st; 11-07-2009 at 07:08 AM..
Old 11-07-2009, 07:06 AM
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