Lets say I am setting up a car and the motor RPM is 21,4k and the gearing is 9×23. If I did the math correctly, the wheel RPM should be 8,374. Lets say I have this set up and I am only getting 7,960 RPM at the wheel. I have checked to see if there is any binding of the axle in the bushings as well as gear mesh and it all looks good. Why would I see such a difference from the calculated RPM and the actual RPM?
I have used this formula before and it has always been close but this one is way off the projection. Thoughts oh great gear set up master?