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The stock LSD's are VLSD's (viscous limited slip differential). Aftermarket units are not. Most are a clutch type(kaaz, cusco, ats) check out the kaaz website for a good exploded view of whats on the inside. Clutch types will engage when the cam in the middle is forced into the triangle opening which creates a force pushing outwards and puts pressure on the clutches. A clutch type diff usually has some level of adjustment as to how easily it is engaged. I have heard that the kaaz is almost like a locked diff right out of the box and needs to be adjusted before you would want to take it on the street. A clutch type sounds like it would fit your needs pretty good . . . i.e. keep both tires spinning right from the get go.
I think the Nismo diff works the same way although it says its a mechanical diff. So far I have only seen "Mechanical LSD" as a way of differentiating from viscous. If it means something more somebody please let me know.
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