Originally Posted by
cobaltssoverbooster
there are three states to fueling
normal operation (stoich), pe transition, and pe.
enrichment rate controls the pe transition zone fueling. by increasing the value you are increasing the transition fuel supply. some call this a pump shot or from carburetors this is what the accelerator pump cams in holley carburetors control.
you monitor this by watching the zone in which pe becomes active. during the transition you can monitor the afr in this very small zone before pe is in full effect and make adjustments to the afr via enrichment rate control.
pe transition begins based on the settings of pe rpm, pe tps, pe map, and sometimes pe torque. you typically adjust the enrichment based on load and where the engine seems to operate the smoothest (without dyno proof). somewhere around 65-70 kpa, 55-75 tps, and whatever rpm feels smooth. i personally start at 2500 rpm and make test pulls from there. the map activation prevents the pe from enriching during cruise or minor acceleration. set it too low and pe will stay active in cruise or come on too soon during minor acceleration and cause a sluggish feeling from over fueling.
its really hard to say what every setup likes because they behave differently. your time slips are good indicators of pe control performance, definitely keep using those as a tuning aid.