Titanium7 Posted July 12, 2012 Share Posted July 12, 2012 Had the new BMW Diff with LSD fitted in October at Caterham Midlands. Just had the car on jacks and rolled one of the rear wheels and the other did nothing! Did the same with the other rear wheel and again the other wheel stayed static. I am sure it should be moving in the same rotational directiom? Link to comment Share on other sites More sharing options...
DJ. Posted July 12, 2012 Share Posted July 12, 2012 The other wheel would normally rotate in the same direction with an LSD, or the opposite direction with an open diff. The propshaft doesn't usally move because the reduction gear of the crownwheel/pinion means it is easier to move the other wheel. If the prop is staying still and so is the other wheel it is acting as if there is no diff and you've got one wheel drive! I'm sure an expert will be along to correct me on this. Duncan Link to comment Share on other sites More sharing options...
Titanium7 Posted July 12, 2012 Author Share Posted July 12, 2012 Turning either of the rear wheels, the prop shaft rotates but not the other wheel. Link to comment Share on other sites More sharing options...
classic1952 Posted July 12, 2012 Share Posted July 12, 2012 Try putting it in gear. The LSD part will not function when stationary. Link to comment Share on other sites More sharing options...
The Pikey Posted July 12, 2012 Share Posted July 12, 2012 Maybe CC fit a ATB diff? How do they act when one wheel is turned? Jason Link to comment Share on other sites More sharing options...
Titanium7 Posted July 12, 2012 Author Share Posted July 12, 2012 Ah ha, just started the engine and into gear both wheels driving when trying to slow one down. Many thanks!!! Link to comment Share on other sites More sharing options...
Pendennis Posted July 12, 2012 Share Posted July 12, 2012 Isn't that the way a viscous LSD works Link to comment Share on other sites More sharing options...
Titanium7 Posted July 12, 2012 Author Share Posted July 12, 2012 I may be wrong but isn't this the one in the BMW diff, with the carbon fibre plates here Link to comment Share on other sites More sharing options...
Titanium7 Posted July 13, 2012 Author Share Posted July 13, 2012 Ok I have found out that with the torque biased LSD's which appear to be in the BMW diff, the only simple way of finding out, if you have one or its working properly is to 'give it some beans' and drop the clutch whilst turning. If you get two skid marks all is good. This I am going to call the 'LSD donut test' 😬 Link to comment Share on other sites More sharing options...
mic Posted July 13, 2012 Share Posted July 13, 2012 BMW diffs have Titan plate LSDs Link to comment Share on other sites More sharing options...
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