Using a potentiometer makes sense. At what point is the system in open loop? Is it rpm or load dependent or both? Once you adjust with a potentiometer at a specific point (rpm or load) in open loop will the afr then remain constant throughout the open loop range? I ask as the Apexi gives you a number of points (16?) that you can make adjustments.
Is the reason that a potentiometer or a device like the Apexi doesn't help in closed loop due to the fact that the ecu is already making adjustments? Is there a range in closed loop beyond which the ecu can't compensate (such as using a 987 maf in place of the 986)?
Just when I thought I was getting me head around this stuff.
