Having done upgrades to 2 PS1 engines, a Weaver engine, and a Williams engine, one feature I wish was available is the ability to adjust the speed reference in the upgrade software. There are unit-to-unit differences in gear ratio, wheel size, flywheel size, etc., that can cause pretty noticeable speed differences. I have tried adjusting the number of stripes on the flywheel, but this is crude at best.
For PS2 upgrade kits it's probably too late, but maybe this feature can be included in PS3 upgrade kits?
Hopefully,
Gary F.