Hello guys. I am just trying to think something through and am wanting some other opinions.
I know the analog speedometer in the dash is run off of the rear tires. I also know that Ford uses a positive 1.3403 % offset (Source: http://www.efidynotuning.com/trans.htm) for the revs/mile adjustment.
Still, if my rear tires are one height and my front tires are a different height, will the speedometer every be able to perfectly accurate? The manufacturer specifies 791 revs/mile for my rear tires. I have tried everything from 775 to 800 revs/mile on my X4, and my speedometer always seems to read 1-3 mph faster that what my gps tracking states, depending on how fast I am moving.
I will be taking some sticky goo and a tape measure and manually calculating my revs/mile today, but I am wondering if I am chasing after something that is too much of a fine adjustment for the X4's 5 rev/mile graduations.
I know the analog speedometer in the dash is run off of the rear tires. I also know that Ford uses a positive 1.3403 % offset (Source: http://www.efidynotuning.com/trans.htm) for the revs/mile adjustment.
Still, if my rear tires are one height and my front tires are a different height, will the speedometer every be able to perfectly accurate? The manufacturer specifies 791 revs/mile for my rear tires. I have tried everything from 775 to 800 revs/mile on my X4, and my speedometer always seems to read 1-3 mph faster that what my gps tracking states, depending on how fast I am moving.
I will be taking some sticky goo and a tape measure and manually calculating my revs/mile today, but I am wondering if I am chasing after something that is too much of a fine adjustment for the X4's 5 rev/mile graduations.
