EXP Jawa
Well-Known Member
- Joined
- Jun 9, 2014
- Threads
- 3
- Messages
- 1,011
- Reaction score
- 206
- Location
- Rochester, NY
- Website
- www.torsen.com
- First Name
- Rick
- Vehicle(s)
- 1999 Cobra Convertible, Electric Green
I don't think it changes how often you've got movement, just the behavior when it does. Well, I suppose you could argue that the slight lowering of TBR means that there's the potential for slightly more slip. BUT, keep in mind that when driving, the gear rotation speeds are pretty low. A typical turn might be 20-30 RPM difference in axle speeds. That means that one gear rolls "forward" at 15 RPM, the other "backwards" at 15. You don't get much heating contribution in the axle system from the diff gearing. Yes, there is friction, but the dynamic friction only occurs occasionally and the relative speeds are low.
Also, on a road course, very little differentiation actually occurs. If you pulled wheel speeds from the vehicle's CAN bus, you'd see the rear wheel channels don't vary from each other much. Generally, when driven aggressively (high axle torques), the diff tends to stay locked, especially with TBR values. The ability (for a helical diff) to build friction and resist wheel spin is directly proportional to the amount of input torque, so high torque = high friction, which means little relative movement and little dynamic friction. The vast majority of heat generated in the axle system comes from the ring and pinion, as there is a substantial amount of friction in hypoid gearing, and that too goes up with torque load. You wouldn't see a significant differential contribution unless you forced continuous differentiation, like if you used a mini-spare tire at high speed. Obviously, that wouldn't happen at the track.
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