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Originally Posted by slava
Can you explain in two words what O2FB Accel Clear, O2FB DFCO do?
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O2FB Accel Clear, when checked, sets the AEM to reset its O2 Feedback fuel change percentage to zero when you trigger a fuelling change in the Accel Fuel table (ie: when you increasee throttle a significant amount in a short period of time). In general, you don't want to do apply O2 Feedback fuel changes in cases where the rate of load or RPM change on the motor is high (rather, your map should be accurate enough to provide proper fuel in those situations). O2 Feedback is best at handling steady-state cruising conditions.
O2FB DFCO is the same thing as Accel Clear, only it occurs when you use Decelleration Fuel Cut Off. DFCO is triggered when load is below whatever value to set it to trigger at. It cuts fuel completely when you are totally off the throttle, preventing backfiring and improving gas mileage.