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Diagonal spin test |
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| Last changed: 2012/06/11 22:48 / History | Edit |
why only center locking differential is not enough. Diagonal spin test.(Edit)These videos show a Subaru Forester (2.5 A/T) whose diagonally opposed wheels have lost traction. This is a typical off-road situation where most four-wheel drive vehicles fail. The car does not have an optional rear Limited Slip Differential neither it has an electronic traction control system. One of these devices could have helped to move the car forward. These videos show a Jeep Grand Cherokee whose diagonally opposed wheels have lost the ground contact. The front left wheel and the rear right wheels spin. This is a typical off-road situation where most of the four-wheel drive vehicles fail because they do not have a locking differential in either of the axles. As a rule, neither electonic traction control systems nor limited slip differentials help here. This is because these traction devices cannot transfer enough torque to the wheels that are on the ground. A fully lockable differential installed in the rear axle is needed to get the car moving in these conditions.
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| Last changed: 2012/06/11 22:48 / History | Edit |
Do you think this information about Why Only Center Locking Differential Is Not Enough. Diagonal Spin Test. is incorrect? Please send us what you know to 
or leave a comment below.I've heard Eaton locking diffs are very good--right up to the point where they explode.
Actually that Jeep has speed sensitive differentials front and rear.
md.co.za/jeep/index.htm
The problem is that the front differential is 'tuned' too conservatively. The outlet port is too large, and the maximum pressure relief is too low. [and he isn't giving it enough gas! the power transfer is proportional to torque and speed difference. He has the speed difference but isn't applying very much torque at all]
www.rubicon-trail.com
Ideally you'd want torque sensitive differentials front & rear, so you can do the Hummer/HMMWV 'trick' (apply service brakes, apply throttle, slightly release brakes and the torsen differentials will make sure you get torque to the wheels with traction)
That is the route that Jeep went with in the Wrangler Rubicon models (and they can be mechanically locked too!)
autoreview.ru/new_site/year2002/n20/jeep/800/diff.jpg
As you show in the Jeep section, the next generation of Grand Cherokee removed those limitations. Clutch pack clamping pressure is now regulated electronically.
www.youtube.com
Thank you for contributing to this web site, George. This is very valuable information that you are sharing.
