UNIC has developed a “Non-Hysteresis” LSD for motorsport with a lot of new features. The Unic LSD is lighter, stronger, and easy to adjust. In less than a minute the preload can be set to match the actual track conditions. It is in stock for Volvo M30-31 and this is also used in our Rallycross SuperCar transmissions where it, for example, have won two World Titles with Petter Solberg.
Using a control button installed on the casing, the preload can be adjusted between 0 and 120Nm. Together with the other settings as ramp angles and number of friction surfaces, this will suit all car’s and running conditions. To keep the preload in a desired level is important, but not possible without the adjustment because it will become lower along with the disc wear.
2. Locks when needed – Releases when not needed
The ramp system is designed using rollers and balls instead the conventional “steel to steel friction”. This gives a “Low Hysteresis” system meaning the LSD can be less aggressive but still provide enough locking torque at acceleration, and release earlier when the throttle goes off. At medium throttle or in high gear, the reduced diff lock will increase the side grip.
3. Quick but smooth
The design of the friction disc’s will allow the oil to drain faster and the braking torque comes quicker. The disc’s have a special coating that will prevent sticking and “slip-stick”. They are also designed with “flexing” splines to enable micro-movements. All resulting in a very smooth function without noise.
The UNIC LH-LSD have more disc’s and will use up to 16 friction surfaces instead of the common 8-12. This makes it very powerful and is able to lock even at very high torque. Yet the load on each surface is less, resulting in less wear and therefore the LSD will last longer.
5. Lightweight and strong construction
All parts are made in high quality steel and case hardened for the best strength. A slimmed design and a lot of cut out’s together with the best material and heat treatment gives the Unic LSD a total weight of only 5.8 kg, which is the far lightest on the market in this torque level.