you already written in another post....if you swicciato lim fumes from maf to map, you are not allowed calcolarti the afr exact....
the variables related to temperature ,pressure ,density of air etc. are so various, that ? impossible to calculate an AFR as you f? with the lim fumes maf based..
when making this mod, in fact the car tend to smoke slightly more, because, precisely, the calibration air, diesel does not ? cos? accurate as with the lim fumes maf active....