The way I understand it is that Msec is added to the injector pulse width to compensate for fuel dropping out of suspension on manifold pressure changes. I use my wideband and the line graph monitor in tunerpro to adjust AE. I set the monitor to show my WBO2, TPS, map, and RPM. when I see a change in tps I look for how much it changed and when/if the AFR changed. in theory if AE is right you shouldn't see a change in AFR. if it is not right I look at when the AFR went too rich or lean. if the AFR spike coincides with the movement of the TPS then I adjust AE TPS. if the spike occurred just after the throttle movement I adjust MAP AE. as you can see below when the throttle changed (green) my AFR (red) went rich MSec's after the throttle opened so I adjusted MAP AE. this might not be the best way but it seems to work for me.
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