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I have a track only car (tune on the street but do not daily drive or anything) and I am currently pretty happy with the maps but have been running with EGO controller step size at 0.
Is there any real reason for me to turn EGO correction on?
I assume engine management goes to open loop at higher loads
It can if you tell it to.
Under More Settings -> Lambda AFR you can define an upper switchpoint (in kPa) at which a different limit is applied to EGO Authority. This limit can be made zero if you wish.