Limated slip diferential, what does it do? I have too much rear wheel spin from high hp, will this help?

 

NO it does not help with "Wheel Spin"

But, keeps both wheels spinning at the same time...

For example... If you do not have an LSD and one wheel is in water and the other one on dry ground... the wheel in the water will spin and the other will stay still...

With an LSD both wheels will spin no matter what...

A perfect example of it in video is in the movie "My Cusin Vinny"...

 

wow you opened a whole can of worms on this one...

Basics: A differential is what sends the power from the spinning drive shaft and splits the power to the drive wheels. You have either and open diff, a LSD (different types), and then you have locked or solid diff; (spool ect.)
A viscous limited slip (VLSD) being standard on all 350z's except for base models

On an open diff, the power takes the path of least resistance, so if one wheel looses traction all the power goes there. Ex. if you do a standing burnout with an open diff, which ever tire looses the grip first, and starts spinning, all the power goes to that wheel and the other tire doesn't spin. On solid axle vehicles like a truck, they tend to spin the passenger side tire because when you apply power the entire axle twist some and there is less weight on that tire.

A LSD, if one wheel looses traction the power continues to flow to both wheels, this is done through different means (clutches ect.) and different styles of differentials. This still allows the wheels to spin at different speeds however, like when making a turn, the outside wheel spins faster than the inside wheel. When you do a burnout here both wheels will spin. There are numerous types of LSD's, and some are stronger than others, and this becomes a factor on higher hourse power vehicles.

A locked diff the power is sent to both wheels equally all the time no matter what. So in a turn the inside wheel is being forced to go faster than it wants, and the outside wheel is being forced to go slower than it wants. This is what true drag cars typically run.

There are also some diffs out there that act like an open or LSD, until you activate an electrical current or air line, and then the the diff becomes locked. A lot of offroaders run these.

Then you get into "tighter" or "looser" LSD's and how they behave coming out of turns ect. ect. ect.

 

You can check howstuffworks but...

The primary purpose of Limited Slip Differential is to apply torque to wheels turning at different speeds. In a turn the outside wheel turns at a greater speed than the inside wheel. Whatever wheel is slipping, LSD will apply more torque to the other wheel.

 

LSD is illegal but good **** hehe