Couple of fuel setting questions

[badgta]

Attached are pics of my TPI bin that i am working on...


It's a EBL P4 computer, but the specific tables i am asking of are of the factory types so i hope i am in the right place..

If you notice in the pics, the "INT" MEAN R/L settings have a lean, rich, and median number.... The median is always exactly between the rich/lean numbers. But the idle setting of this is not.. Why?!?

You can see when i compare to a factory setting, the mean r/l for INT at idle is the rich side, shouldn't it be in between like i have it on the right side?


Also, why is there a need to run richer and warm the engine up quicker?

Why would it be a bad ideal to go for a 14.7X:1 AFR from start up seeing as how this is a special occasion street machine that is only used on warm days in a warm climate S.E U.S KENTUCKY.


The reason i am making this is i found these while looking for a possible awnser to a slight issue she is having during "TIP IN" right when the gas first gets touched.. Give it more and it pulls right out fine, barley touch it sometimes in D/R and it tries to die out.... Any help appreciated!!

T.I.A

[steveo]

its typical that at idle the switch point is different in a factory calibration
it might be partially to change idle afr....maybe for idle emissions which aren't necessarily best at stoich.. but also with big exhaust pipes and really low rpm sometimes the o2 kinda stops responding as designed. remember the thing takes heat and oxygen into voltage, and the flow is pretty low at idle, and things cool off a bit too. there is probably a good reason its like that, although you're tuning, so turn whatever knobs you feel like to see how it responds

[steveo]

oh and for warm up you should always start rich. no engine will start well at stoich. combustion temperature has to come up before itll run properly without the extra juice