Join Date: Jul 2017
Location: Nobel Ontario Canada
Bullitt Year: 08
Bullitt Color: DHG
Bullitt Serialized Number: 4404
TORque SENsing Differentials.
The Torsen differential is a purely mechanical device; it has no electronics, clutches or viscous fluid. It is not a locking differential! It is a torque biased multi gear final drive.
The Torsen works as an open diff. when equal torque is applied to each wheel. As soon as one wheel starts to lose traction, the difference in torque causes the gears in the diff. to bind together. The design of the gears determines the torque bias ratio. For example: If the diff. is designed with a 3:1 bias ratio, it is capable of up to 3 times more torque to the wheel that has good traction.
The 2019 Bullit Torsen comes with 75W85 synthetic gear lube and friction modifying additive. The selection of gear lube helps with fuel mileage and the friction modifier helps to keep the gears quieter. (They can be squeaky/creaky a bit) Under normal street use this combo is OK and a lube change after one year and every 30,000 miles/50,000 KM thereafter would be fine. (My suggestion)
Because the Torsen is confined in the center section, the diffs. tend to run hot under heavy track use. Torsen recommends 75W140 synthetic gear lube for heavy duty use and a lube change after 12 hours of continuous track usage. (Like six lapping weekends) I suggest you keep track of your motorsport hours.
You can use the friction modifier as well, but it reduces the effectiveness of the gears binding. The 75W140 provides greater film protection for the gears. Torsen differentials are less than ideal for drag racing. A swap to a spool diff., center section bracing brackets and HD axles would be recommended. Otherwise: See picture #2
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In my defense, I was left unsupervised.
Last edited by bullit4404; 03-21-2019 at 01:50 PM.