Limited Slip Differentials or LSDs can help your car perform better without actually increasing your amount of horsepower, torque, or weight. LSDs allow the transfer of power from one wheel to the other allowing the car to better regain traction. This is most noticeable over uneven terrain, with transitions of weight, and with traction around corners.
When a wheel loses tractionand is free spinning it is difficult for it to regain grip. An experienced driver can modulate the gas and allow the tireto spin at the same speed as the car again granting it grip. An LSD causes the wheel to spin freely bringing it back to grip on its own without removing any throttle. This allows experienced drivers to continue accelerating through certain spots of uneven ground.