I've updated my ADPCM program to let you calculate and update the scale factor value in your engine. Given the wheel diameter, gear ratio, and number of stripes, it calculates the value and writes it to a sound file. Then you can download the sound file into the engine.
It needs to be tested. If any one has an actual situation where the scale factor calculation can be confirmed, I will make the new version of ADPCM available to them.
My email address is at the bottom of each of my web pages.