Roger, thank you for all the details and info you have posted in this thread.
I am still trying to wrap my head around much of it, but it has certainly let some light into WTF is going on inside the Motronic brain.
Originally Posted by roger 04 rt
...Were I to boost my fuel output using a -20C air-temp shifter on a 20F day, that pulse would lengthen to almost 8.6 mS. More than 100% on-time!...
BUT, making conclusions about the efficacy of IAT shifters ( or other performance mods) based on their performance at temperatures well below freezing doesn't seem reasonable.