Trouble Getting In Driveway

[aiboart]

....Rednut99, are you sure they are a viscous type LSD?   I can't say I have bothered to look so far but would be interested to know its makeup.

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LSD is a wet clutch, metal plate, non ramping, both axle design, as used in many 4wd vehicles. Ben.

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Ben, would you please expand on that a little, I would like to know more as to how these things work?

Also, could you give us some idea of how these systems behave so that we have a better idea of how to use them?

Thanks and Regards,

aa

[Grass]

The viscous LSD's aren't nearly as good as the old clutch pack ones. But I'd say its stuffed?!

There ain't anything "visous" about the LSD in the BA's....

It is a clutch pack style.

The SRD diff, Hydra Track are absolutely Fabulous...until they start to wear a little (about 50K) then they get a little too agressive.

[WBT56]

LSD is a wet clutch, metal plate, non ramping, both axle design, as used in many 4wd vehicles. Ben.

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Ben, would you please expand on that a little, I would like to know more as to how these things work?

Also, could you give us some idea of how these systems behave so that we have a better idea of how to use them?.

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Wet clutch = limiting device runs in oil bath of primary lube fluid.((as opposed to a sealed ,typically viscous (silicone drive) unit, eg subaru system). Basically means that lube fluid is important for effective operation of LSD.

Metal plate = metal clutch plates, as opposed to friction linings.

Non ramping= Cross pin is fixed, so torque does not ramp up the unit as in KAAZ style diffs, eg Rodeo.

Both axle = runs a small clutch on both axles, as opposed to a large clutch on one.

Basically friction tries to tie each axle to the housing individually. Work great when they are working, but one wheeling can fry them very quickly. If it does one wheel often, find out why and rectify. Ben.

[rusht]

rusht> Just how steep is your driveway after the gutter? If it is fairly steep then it is quite possibly just more than the diff can cope with. It is not a torque transferring diff in the ultimate sense ie. it can only transfer a small amount of torque to the wheel with traction and sometimes that isn't enough to overcome the load being placed on it.

To test if your diff is working:- next time you get stuck, turn off TC and just let the left wheel keep spinning and stick your head out the drivers door and have a squiz at what is happening at the right rear. Rev the motor a bit, do not overdo it though, say up to 1500rpm, and see what happens. If it shows signs of shuddering and trying to push the car forward then it is working. BUT maybe not as good as it should, depending on the steepness of the grade, so I suggest the only way to really test it is to try another car, preferably an XR6T, on your driveway in similar conditions.

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Will give it a try. Driveway is not steep at all but is very steep in and out of the actual gutter - left front and right rear wheels pushed up into the guards.