ok first up i dont need to call anyone at waikato... i have the epc right here in front of me...
second, just to clarify that we are all talking about the same things here:
helical/torsen as done by TRD and quaife..... gear type lsd
clutch pack lsd... uses clutchs to limit slip
viscous........ uses fluid
when looking up the epc it doesnt tell you if its helical or viscous type, no way to tell that acuratly from the epc, it just shows a complete centre unit. some of which look more like vicous than not. you can tell if its got clutch pack as the shims are seperate parts. so i retract what i said about supras, never had one apart. for the 70series it shows both clutch pack or what could be either viscous or helical. in hindsight i would lean towards helical as they tend to be a better unit to use with heaps of power.
as for the 'e' series box i have never heard of or seen a factory fitted helical type. have done so with viscous though, that would also explain why the 'c' lsd boxes use normal gear fluid, the viscous is sealed and has its own fluid encased within. having said that though, i believe some helical units can also use normal fluid.
viscous are far more common as fwd diffs, they dont have the torque steer of other styles
if you pull apart a 'e' series and its got a helical type then chances are its an aftermarket one. congratulations.
if anyone can prove different id love to see the evidence... im here to learn as well
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