How do you find the rear differential ratio on a Subaru?
Mark the wheel and the drive shaft with chalk or masking tape. Turn the wheel TWO revolutions and count the number of driveshaft turns. The number of driveshaft rotations will help you determine your rear axle ratio. For example, if it turned 3 and a half times, it’s a 3.50:1 ratio.
How do you find the ratio of a diff?
The calculation uses the number of teeth in the ring gear and divides it by the number of teeth in the pinion gear to provide you with a “[result] to 1” ratio. For example, if the pinion gear has 41 teeth, and the ring gear has 11 teeth, the ratio would be calculated as 41/11, which is equal to 3.73 = 3.73:1.
What is changing diff ratio?
By changing it, you can affect the performance of your car, rather dramatically in some cases. In general, a lower final drive ratio will lead to less torque at the wheels but a higher top speed. Meanwhile, a higher ratio will result in the opposite, i.e. more torque at the wheels but a lower top speed.
How do you find the diff ratio on a BMW?
The diff ratio is typically stamped on a stainless steel tag attached to one of the upper rear cover bolts. If not, it’s still pretty easy to determine. If the diff is out of the car, place a mark at the 12 o’clock position on the input flange and on one of the axle flanges.
Does VIN number tell gear ratio?
The gear ratio is usually listed in the VIN code located on driver’s door, the glove box, or the ID plate on the dashboard. Count the times a rear wheel goes around for one driveshaft turn: if its 3 1/2 it’s a 3.50:1. Divide the number of teeth on the ring gear by the number of teeth on the pinion gear.
How do I know if my differential is e30?
Identification. To identify an LSD one can first check for the presence of the tag on the rear casing. The ratio on this will be prefixed with an S for LSDs. Alternatively one can jack up one rear wheel, ensure the car is out of gear and hand-brake is off then turn the raised wheel.
