Originally Posted by Jeff@topgearsolutions
Is that because it is load based? Therefore in more "efficient" colder weather where the air is more dense it will simply lower boost but power will remain similar and therefore require similar fueling?
Any ECU tuning will be mapped per MAF whether calculated or measured directly. LTFT adaptation can change the STFT but this doesn't seem to happen at WOT. If the OP changed hardware (altering VE) this could change trims.
Anyway log boost channels, at least timing setpoint/correction cyl 1, LT/ST trims. And maybe you pump pressures. I bet its torque reduction by the DME