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 Limited Slip Differentials
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KAAZ Limited Slip Differentials (“L.S.D.”) react fast without fail and have a wide range of adjustments available to suit different driving conditions. KAAZ uses the largest friction plate size and number of plates possible to gain maximum performance.
As a result, when compared with other L.S.D. brands, you will find that a KAAZ L.S.D. offers the following advantages:
- The sensitive L.S.D. will work even when the slightest torque is applied.
- Increased ability to transfer power from the engine to the wheels without loss of power.
- The power acting on the plates is reduced so that abrasion on the plates are protected.
- Increased number of friction plates greatly improves abrasion efficiency and heat capacitance of the plates.
- Not only the friction plates, but all parts of our L.S.D. have been improved and made larger, so the overall strength of the main body is increased.
These merits gives the L.S.D. near perfect efficiency, stable operation, and long lasting outstanding control for you. For a better understanding, you can view an exploded view photo of the Kaaz L.S.D.
that shows the overall product construction. Use our special formula L.S.D. oil to maintain peak performance and prolong your L.S.D. life.
Product Introduction
With a normal differential, which a majority of the cars today are factory fitted with, the operation is very basic. The differential simply separates the power from the engine to the two wheels giving the wheel which is simpler to run more power so that the two wheels are running at different speed, thus providing easier turn for the car. But, when the car is turning at higher speeds, the car will tilt to one side, and you hear the squelching sound. The car doesn't tilt as much as you see in the action movies, but tilting still occurs. When this happens, the normal differential puts more power on the wheel that is in the air, which is useless until the car is out of the turn. This is where a KAAZ L.S.D. can help to reduce the loss of power transferred to the wheel.
As you may already know, a race driver wins their race from gaining time when they are cornering. For this reason, many car manufacturers keep trying to make cars turn more efficiently at a faster speed without slipping out of course. The structure of the normal differential is as shown below:
Product Features
The KAAZ Limited Slip Differential is constructed very similar to the normal differential, as shown below:
As you can see, the side gears, pinion gears and the pinion are all located inside the two pressure rings. Behind each pressure ring are several clutch plates “A” and “B”. When the accelerator is stepped on, the differential case spins and pushes the pinion in between the pressure rings. The pressure rings are then pushed out against the clutch plates making the plates bind together and lock on both drive shafts making both wheels turn at the same speed. The cone spring is installed at the very end of each multi-clutch plates. The cone springs apply some initial torque to the plates so that the pinion doesn't need to be pushed too far to make the L.S.D. come into effect. For a better understanding, you can view an exploded view photo of the Kaaz L.S.D. that shows the overall product construction.
A special blend oil made by KAAZ named "PowerTrain Gear Oil" can be used to keep your L.S.D. running for long hours under the best condition. The oil helps the clutch plates to grip and slip when needed.
Introduction to LSD
The Normal Differential
As we well know, a race car driver wins races from shaving lap times by cornering faster. Because of this many teams and constructors try to make their cars that can maintain higher cornering speeds.
On every car a basic differential is fitted to distribute the engine's power to the driving wheels. The basic differential gear (Figure 1) supplies the power to the wheels which is/are loaded with least resistance. This allows the car's wheels to run at different speeds in a turn with least resistance.
Figure 1.
 
 However, when a car is cornering close to it's limit, the car will exhibit roll, a leaning to one side, causing the inside tire(s) to lose forward traction and lateral grip. The wheels lift and cause excessive spin because of lack of downward force or weight distribution. This wheel spin is useless for acceleration until the tire(s) regain traction and start to translate the power to the ground. Limited Slip Differential (LSD) is needed to alleviate this wheelspin.
Limited Slip Differential
An LSD is constructed slimilarly to the normal differential (Figure 2).
Figure 2
As you can see, the pressure plate rings have the side gear, the pinion and the pinion gears locked inside and behind each pressure rings are a number of clutch plates. When torque is applied to the differential, the differential case will rotate and throw the pinion into the pressure ring cam. The pressure ring is then pushed out against the clutch plates thereby squeezing them together. This in turn causes the wheels to gradually lock together, depending on the power applied. This effect limits the wheel spin during hard cornering and applies power to the wheels evenly when more power is applied. On acceleration and deceleration, it provides even grip and on neutral power, it frees up for less drag and easier turning.
Different Type of LSD Configurations (1 Way, 1.5 Way & 2 Way)
Some manufacturers make LSD's in different configurations and are commonly classified as 1 way, 1.5 way and 2 way. This designation reflects the design of the cam groove which enables the LSD to function differently under different loads. A 1 way differential means that the cam is shaped in such way as to have positive lock only when accelerating. The 2 way is constructed in a way to have positive lock motion in both acceleration and deceleration mode (Figure 3). The 1.5 way functions almost same as a 2 way but provides less lock when decelerating. The 1.5 way can provide more forgiving balance when braking than a full 2 way setup, although it is less effective for true racing applications, it provides easier operation for beginners in throttle off conditions. 1.5 way is also very effective for front wheel drive cars which need extra stability during braking.
A Comparison of LSD
There are many brands and grades of LSD in today's market.
The OEM supplied LSD, standard and optional on many cars today are 2 pinions. This design has very low positive lock and it is designed to provide some sporty feel to the showroom cars. Because of the nature of this low lock design, it is just slightly more effective than not having one at all. Not a choice for true performance drivers.
A performance LSD should have at least 4 pinions. This is the design used for racing and rallies around the world. The positive lock ratio and linear lock characteristics are determined by a number of components. The cam profile, clutch plate quantity and size, initial torque of the preload springs and the lubricants.
A viscous type, torsen type and helical type are some of other designs used as OEM equipment or optional LSD unit. These designs are commonly used since they are less aggressive and easier to maintain than the clutch type racing LSD unit. In order to achieve the maximum traction control, most OEM performance divisions and aftermarket manufactures use the clutch type design for their LSD unit.
KAAZ Technical Help
Breaking Procedure of new Kaaz LSD
All new Kaaz LSD needs to be broken-in to seat the clutch plates. Applying too much torque when the unit is new will cause damage to the clutch plates and may result in plates forming a angle fit. Once these plates form an angle fit, the LSD is unable to function at 100% efficiency. This will also result in more chattering noise under low speed turns. It is very IMPORTANT to perform the breaking procedure as described below.
Chattering Noise.
All clutch type LSD's make chattering noise under low speed turns. This is normal for these types of LSD. The reason for this chattering noise under low speed turns is that the clutch plates are rubbing against each other thus giving you the limited slip action. If the breaking procedure is completed according to the diagram above and proper maintenance of the LSD is performed, the chattering noise will gradually decrease after accumulating some miles
Oil for Kaaz LSD
It is important to use 80W/90 GL-5 specification gear oil on Kaaz LSD. We highly recommend using our own Kaaz LSD fluid.
DO NOT USE SYNTHETIC BASE OIL ON KAAZ LSD. Kaaz LSD may not function smoothly.
Differential Oil Change
When one has a Kaaz LSD, it is important to do routine maintenance of LSD Oil. We recommend to change LSD oil every 5000 miles for daily driven and occasional track use vehicles. If the vehicle is full race, we recommend more frequent oil change.
By changing the LSD Oil , Kaaz LSD will give you a long life span. Take care of it just like your engine.
KAAZ L.S.D. PRICE LIST
For questions be sure to check out our frequently asked questions page or contact us. |
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