Thread: Lm-2?-ii
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911st 911st is offline
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Join Date: Jan 2004
Location: Sacramento
Posts: 7,269
To keep the Lambda system from effecting your idle and cruse AFR's when tuning, you have to un plug your factory O2.

After you are done tuning and if you want you can try enabling the Lambda system again by plugging the O2 back in. It might then be that the Lambda computer can not compensate enough to bring the AFR back to near 14.7.

I have suspected that one could tune it for 13.2 at idle and try using the Lambda system to pull the AFR back to 14.7 for better economy. Then with acceleration when the throttle position switch turns off the Lambda, you would get the more beneficial to acceleration AFR.

Your idle AFR and ignition timing most effect your temps at idle. The factory retards timing at idle to make the motor run hot for emission reasons.
Old 05-08-2010, 08:33 AM
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