Thanks for the explanation!mlewis said:Each Power Commander map cell represents a percentage of change to whatever the actual injector percent duty cycle was set to deliver from the ECM. Example; ECM calls for an injector duty cycle of 20% in the 60% throttle, 3000 RPM cell. You select a +10% change in that cell which will increase the 20% injector duty cycle to 22%. Note that a percentage increase in a PC map cell affectively decreases the air fuel (A/R) ratio for that cell, but by no means is the resulting percentage of change in A/F a one to one relationship to the change in injector duty. Ah, the PC is a great tool, now if only I could find an equally great dyno tech around here to take full advantage of it!