The 8 bit math is not a limitation of the microcontroller, it's a limitation in the fuel interpolation routine. If one were inclined to do so, one could theorectically rewrite the interpolation routine to use a 16-bit math function, and expand the tables. However, the MAP signal routine would also have to be altered in order to take advantage of these expanded tables.

 

maybe ill try jan style :P 15psi, afc hack, stock map sensor!