Discussion
I have it on mine a Tuscan'S', only picked the car up last week,so not had a chance to test it myself, but on the test drive we were trying to get it up on 3 wheels round a bend as what it does is transfer the weight and power to the wheel that is in contact with the road, so it means you can take corners faster!!!
CK
CK
the differential handles the torque distribution between the two driveshafts.....
LSD is not just a differential in itself - it serves two purposes - that of a diff - and that of limited slip service...
A Limited Slip Differential (LSD) attempts to address the problems of an Open Differential (a basic type of diff)....
A Limited Slip Differential is very similar to an Open Differential, but it adds a spring pack and a set of clutches. Some of these have a cone clutch that is similar to the synchronizers inside a manual gearbox...
The spring pack pushes the side gears against the clutches, which are attached to the box-cage. Both side gears spin with the cage when both wheels are moving at the same speed, and the clutches aren't really needed - the only time the clutches step in is when something happens to make one wheel spin faster than the other, as in a turn.....
The clutches fight this behavior, wanting both wheels to go the same speed. If one wheel wants to spin faster than the other, it must first overpower the clutch... The stiffness of the springs combined with the friction of the clutch determine how much torque it takes to overpower it.
Pretty simple really, but there are some top LSD's out there - email me if you want a performance diff replacement... although you'll also need a better gearbox...
LSD is not just a differential in itself - it serves two purposes - that of a diff - and that of limited slip service...
A Limited Slip Differential (LSD) attempts to address the problems of an Open Differential (a basic type of diff)....
A Limited Slip Differential is very similar to an Open Differential, but it adds a spring pack and a set of clutches. Some of these have a cone clutch that is similar to the synchronizers inside a manual gearbox...
The spring pack pushes the side gears against the clutches, which are attached to the box-cage. Both side gears spin with the cage when both wheels are moving at the same speed, and the clutches aren't really needed - the only time the clutches step in is when something happens to make one wheel spin faster than the other, as in a turn.....
The clutches fight this behavior, wanting both wheels to go the same speed. If one wheel wants to spin faster than the other, it must first overpower the clutch... The stiffness of the springs combined with the friction of the clutch determine how much torque it takes to overpower it.
Pretty simple really, but there are some top LSD's out there - email me if you want a performance diff replacement... although you'll also need a better gearbox...
There's a good description of the hydratrak diff and how it works about midway down this url: www.cerbera.co.uk/cerbera/joospeed.htm
Looks like it makes the car less easy to get the tail out on.
rmc
Looks like it makes the car less easy to get the tail out on.
rmc
Like what he said, but I think the difference between Hydratrack and a 'proper' LSD is more fundamental. An ordinary friction locker transfers a constant amount of torque from the faster wheel to the slower wheel, the amount of torque transferred is a constant (defined by the diff preload) plus a component that is proportional to total prop shaft torque (defined by the taper angles in the diff). This sort of diff is nicely predictable, transfers torque the instant either wheel starts to spin up, and makes power oversteer (relatively) predictable and controllable. However, it also means you get a significant torque transfer in normal cornering due to the variation in wheel speeds, so it suffers a little more push-on understeer in slippery conditions and tends to spin the inner wheel sooner when powering through a corner. However, the amount of wheel spin is limited due to the friction connection between the wheels, so niether wheel will spin up on its own.
HBydratrak is a viscous diff which beaves completely differently. With these diffs, the amount of torque transferred is propertional to the speed difference between the two wheels. Two consequences: (1) in cornering, there is no wind up between the wheels so no push on and no tendancy to spin the inner wheel, you can push harder before it starts to let go, (2) when either wheel slides, it has to spin up quite a lot before the torque transfers to the other wheel. This can mean that in slippery conditions or under hard acceleration you sit there smoking one wheel before the diff transfers power to the gripping wheel.
HBydratrak is a viscous diff which beaves completely differently. With these diffs, the amount of torque transferred is propertional to the speed difference between the two wheels. Two consequences: (1) in cornering, there is no wind up between the wheels so no push on and no tendancy to spin the inner wheel, you can push harder before it starts to let go, (2) when either wheel slides, it has to spin up quite a lot before the torque transfers to the other wheel. This can mean that in slippery conditions or under hard acceleration you sit there smoking one wheel before the diff transfers power to the gripping wheel.
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