open front & rear diffs with computer traction control is not same as locking diffs - Page 4 - Jeep Renegade Forum
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post #31 of 32 (permalink) Old 05-19-2019, 10:53 PM
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Originally Posted by mikeindp View Post
That isn't actually correct.
Just considering one axle:
When both wheels grip the diff applies equal torque to both half-shafts - half the propshaft torque to each.
f there is a locking diff and one wheel has no traction the full torque from the propshaft will be applied to the gripping wheel's half-shaft.
With a braked system with open diff the two half-shafts always get half the torque - the slipping wheel is prevented from spinning by the brake, which from the drive line's point of view is the same as being on the ground.
Exactly. People here are confusing traction control with Selectrain functions. When the system applies the brake to a wheel off the ground, the differential sees that as a wheel with perfect traction against an unmovable object (like a straight vertical brick wall) and sends the torque to the other end of the axle.

This concept is not new, its just been re-engineered with modern technology. Porsche used this idea on the 959 which now costs $1,100,000.00 . Once a wheel comes off the ground or loses traction, whats important is that power to that wheel be redirected elsewhere for maximum ability. How you achieve that can be many different ways.

Rick (Subdriver)
2017 Jeep Renegade Trail Hawk
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post #32 of 32 (permalink) Old 06-18-2019, 09:23 PM
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Originally Posted by mikeindp View Post
To a large extent, yes.
That Car and Driver item is not a bad description though the idea of torque following the path of least resistance is interesting. Torque is a force and always exists as action and reaction - you can't push with any force on something that doesn't resist. If a slipping wheel only needs X torques to spin it then X torques is what you'll get on the other side of an open diff.
I understand what you're saying but you absolutely can apply torque to something that doesn't resist, as long as it has mass. Otherwise gyroscopes couldn't be used to change angles on satellites.

The reality is that as soon as one tire in a open differential system loses traction then the load is removed from the system, and that force is then transferred into increasing the RPM of the engine and the rest of the driveline. The force is still there it's just being used in a way that is not useful to us.
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