Friction disk limited slips diffs without the centrifugal engagement soon wear out and become an open diff. Best positive drive diff is a Detroit Locker or the Torsen. You have to aware that a limited slip diff can make the vehicle suddenly steer left or right when one tire gets good grip.
Geared Torque-Sensitive Differential
Geared, torque-sensitive mechanical limited slip differentials utilize worm gears to "sense" torque on one shaft. The most famous versions are:
* Torsen differential invented by Vernon Gleasman in 1958, then sold to Gleason Corporation, who started marketing it in 1982; * Quaife differential, sold under the name Automatic Torque Biasing Differential (ATB), covered by European Patent No. 130806A2.
Geared LSDs are less prone to wear than the clutch type, but both output shafts have to be loaded to keep the proper torque distribution characteristics. Once an output shaft becomes free (e.g. one driven wheel lifts off the ground; or a summer tire comes over ice while another is on dry tarmac when the car goes uphill), no torque is transmitted to the second shaft and the torque-sensitive differential behaves like an open differential.
Geared LSDs are dependent on the torque and not on the speed difference between the output shafts. Such differentials may be acceptable on dry pavement, but are not adequate on slippery surface[3].
Geared LSDs may be used:
* to reduce torque steer in front-wheel drive vehicles; * as a center differential in four-wheel drive (e.g. on Audi Quattro); * in rear-wheel drive vehicles, to maximize traction and make oversteer easier to manage (as in Drifting). Although, for professional drifting, a geared LSD is less effective compared to a clutch type LSD.
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