twiggy144
Active member
For those of you that have a tachometer connected in the OBDII port, ( model 2023-2025) I am curious to know the ICE RPM while the vehicule is cruising. I am trying to derive the final reduction ratio of the gears in the E-drive transmission. To make this calculation, I need to know the tire size, (which will enable to calculate the tire circumference), the RPM of the ICE, and the speed of the vehicule. I will post back here my formula and calculations.