Limited Slip Differentials: LSD Selection, Setup, and Tuning

A limited slip differential is designed to be tight enough to distribute as much power to the drive wheels as possible, while relaxing enough to maintain excellent handling characteristics for high speed driving. The clutch plate style mechanical limited slip is most often selected for this application because of its simple design, durability, and ease of adjustment.

When you select a Limited Slip Differential (LSD) you will have the choice of a 1-way, 1.5 way, or 2-way diff. A 1-way diff will only lock on acceleration, a 1.5 way diff will lock under acceleration and partially lock under decel, and a 2-way will lock equally under acceleration and deceleration.

How quickly and how well a diff locks is determined by the ramp angles, the horsepower of the car, and the amount of available grip. Steeper ramp angles, more power, and/or more grip will cause a diff to lock more quickly and effectively; shallower ramp angles, less power, and/or less traction will cause a diff to lock up less quickly and effectively.

How much a diff actually locks is determined by the clutch plates. The more clutch plates you run, the more the diff will lock when it's fully engaged. The manufacturers often give recommendations for 100% lock, 80% lock, and 60% lock, which is very useful for tuning the diff for different surfaces and applications.

Finding the perfect balance between ramp angles and clutch plates will make an enormous difference as far as how the car accelerates and will also directly affect the handling. If you've ever wondered how a differential works or you're deciding between differentials for your vehicle, hopefully this video sheds some light on how an LSD functions and gives you the info you need.

Photo Credits and useful links:
http://www.cuscousainc.com/products/d...
https://kaazusa.com/
https://osgikenusa.com/

Produced by: Team O'Neil Rally School

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