i'll ask again - what EGT's are you getting Phil?

i don't know much about mapping, but it seems to me that on different engines with different turbo's and different exhaust systems you can have a different in cylinder temperature depending on the AFR. an AFR that is safe for one combination may give a dangerously high in cylinder temperature for another.

isn't it the in cylinder temperature that you need to worry about rather than the actual AFR?