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Originally Posted by nextse7en
This here topic is 'a gonna get moved.
As far as the question, the way in which our transmissions (USDM models I'm talking about here) split torque will ensure that no more than 50% of power is ever transfered to the back wheels. (front wheels are turned mechanically, rear are driven by viscous coupling (I believe)
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Sorry, no. You're close, though.
The front wheels are geared, but torque is transferred through an electronically operated clutch, not a viscous coupling. When more pressure is applied to the clutch, more torque is sent to the rear.
Here's a simple explanation. The car determines how much torque is sent to the rear by comparing the speed sensors in the transmission. One speed sensor watches the front wheels and the other watches the back wheels. WHen the fronts slip, it applies more pressure to send torque to the rear. When the rears slip, it backs off. The change happens before you notice it. Or, rather, it should. If the transfer clutch is worn the fronts can slip for a bit before it happens.
Subaru 5MT transmissions do use viscous couplings, which require no electronics. I don't know about some of the newer, more fancy manuals like the STi, though. Since you can adjust the torque split on that one, I suspect it has an actual center diff.
And, yes, I'm moving this thread to Tech Q&A. Please post in the appropriate forum. If you want to discuss modifying the transmission, well, we have another forum for that.