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Old 2007-06-12, 03:02 PM   #23
sperry
The Doink
 
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Real Name: Scott
Join Date: Nov 2002
Location: Portland, OR
Posts: 20,335
 
Car: '09 OBXT, '02 WRX, '96 Miata
Class: PDX/TT-6
 
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Quote:
Originally Posted by Dean View Post
A quick look at Mikes' doc of the internals make it appear that it does change from 35/65 to 50/50 assuming sufficient traction is available to reach those levels by effectively locking the planetary gears. It appears there is only a single clutch that appears to control the locking between the input and output shaft in effect overriding the mechanical gear ratios of the diff.

This makes complete sense IMHO. A locked set of planetary gears results in the equivalent of a solid shaft which has a 50/50 split. The clutch slips between the geared ratio of 35/65 and the locked up 50/50.

I am continuing to read and look at pictures. The reduction of clutch engagement on braking may be why I am finding left foot braking to be less effective than I would expect while cornering...
I'm having a bitch of a time visualizing what's going on in there, but it doesn't sound to me like there's anything changing the ratios of the gears.

It seems like the clutch engages, adding drag between the planetary carrier and the differential's case, thus providing drag torque allowing an opposite force for the front wheel side of the diff to push against in order to raise the torque seen at the front wheels.

I'd kill for a cutaway 3D animation of this beast in action.
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