So I scoured TB for what people have run for driveshaft ppr, mph calibration and aux. The numbers are all over the place! These are what I could find that people said worked for them. Not all said their gear ratio and tire size so these numbers may have worked for them because of their set up. Some start with 600, 750, 1500 and 1800 (Cal's number) for ppr and 1482, 1482, 775, 995 (100 aux), and 730 100 aux (Cal's number). I did not experiment with changing the ppr to a lower number and calibration to a higher number. The ratios seem to near each other so I imagine it's the ratio that's works not what numbers go where? It also seems the stock vss signal is a vague and variable number. From what people had posted it may be different on each car? Maybe because of that and gear/tire combo explain why the numbers that work are wide spread? Getting way out of my knowledge on that. At any rate, an experienced friend suggested to start with the 1800 and try around 650 and 100. Right out of garage the speedo and Edash were in sync! Great to see I accomplished (with help!) my first "adjustment" with FAST XFI! In my earlier trys to adjust, I only went as far as 715 and barely noticed a difference. From the new numbers, it took 80 "points" to go 8 mph. I was on the right track, just didn't keep going lower. So to wrap up this long winded post, if you have 3.42 gears and 275/60 tires and want to adjust your mph calibration, expect to change about 10 numbers to 1 mph. Your results may vary, lol.
