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Re: What is it that makes the LSD so nice?
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Posted by Theo (more from Theo) on Thu, 10 May 2001 23:21:23 Share Post by Email
In Reply to: Re: What is it that makes the LSD so nice?, bob, Thu, 10 May 2001 15:53:40
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From somewhere on the Web:

A mechanism that limits the speed and torque differences between the two wheels on an axle (or front and rear axles in the case of 4WD/AWD). Limited slip ensures that some power is always applied to each of the wheels, even when one is on a slippery surface. This is the essential element to avoid getting a vehicle stuck in snow or mud.


And more information (rear wheel drive, but just transfer the concepts)

Based on a little research here's your answer:

In a standard differential, if one wheel loses traction, it will get all
the power and will spin, while the wheel with traction gets nothing. The
idea of a limited-slip differential is to prevent all power from being
applied to only one driving wheel when traction is lost. There are numerous
types of limited-slip, positraction, locker,
etc. units.

The percentage number denotes the percentage of torque applied to the
slower turning wheel from
the faster turning wheel. In a straight line, both drive wheels turn at the
same speed, so no limited slip action is occurring. In a turn, or when one
tire is spinning more than the other (such as on snow or ice), with a
limited slip differential, 25, 40, or 75 percent of the torque applied to
the faster wheel is applied to the slower wheel,
effectively 'limiting slip'. A higher lockup percentage will cause
increased rear tire wear on the inside tire during cornering -- the tire
itself will have to slip slightly to counteract the limited slip's desire
to have both tires turning at the same speed. It will also increase
oversteer in wet or slippery conditions, but it will also increase
understeer in tight corners under dry conditions. This is simply due to the
fact that with a limited slip, the drive wheels tend to want to turn at the
same speed, making the car tend to want to go in a straight line. When it
is slippery, however, both drive tires will tend to lose traction at the
same time, increasing oversteer. The
advantages are less inside wheelspin when accelerating out of a tight
corner. This also translates into more horsepower to the pavement and
faster autocross times -- provided that the suspension is tuned for the
limited slip. The ability to accelerate out of corners without excess wheel
spin can be a great advantage.
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