Torsen unit

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Is a torsen unit 1 way, 1.5 or 2 way ?

Not really relevant as its not a clutch pack diff. Like the clutch packs though, it requires a "reference torque" to work (e.g. both wheels have to have some traction for it to work).
 
i'm sorry.... could you just expand on that a bit ?

This will help you out.... http://en.wikipedia.org/wiki/Limited_slip_differential
Unless you want to be a drifter, the Torsen/Quaife type are probably best for the street. The 1-way clutch pack type is arguably best for all out racing, though you have to rebuild them periodically (was a good back to back comparison of the racing use of all the types in "Sports Car" last year). Drifters probably want a "1.5 way" or "2 way" to make the car slide around as much as possible.
 


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