Quote:
Originally Posted by Jetboy
There is also often a torque limit to one axle or the other. In the Lexus IS for example it's 30:70 Front:Rear in normal driving but can send as much as 50% to the front and IIRC 100% to the rear … The torque limit is likely an inherent property of the center differential gear ratios and helical gear helix angle, not an electronic limit. It's designed so that the maximum force applied to the front is half of input torque due to a friction limit in the engineering of the helical mesh.
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Interesting. I seem to remember reading that in the case of a Limited with an unlocked center differential, the explanation for the asymmetrical torque split was because of the difference in size between the ring gear and the sun gear (it’s my understanding that the Limited’s center diff, though made by Torsen, uses a planetary gear set, rather than the classic Torsen diff that uses three pairs of helical gears rotating around center gears.)
