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Old 05-19-2009, 08:38 PM   #16
chromius
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Originally Posted by bimmerjoe View Post
im curiouse at what an open diff is.
and what is my benefit if i get the m5 diff?
That's a very lengthy subject, plenty of stuff around to read about it, but the short of it is that an open differential is essentially a torque splitting device, that always splits torque evenly to both wheels. always. So when both wheels have equal traction, torque is split 50/50 between both wheels. However, it's downfall is that if one wheel looses traction it takes almost zero torque to rotate that wheel, and as a result the wheel that has traction also gets zero torque and the car goes nowhere and the power from the engine is converted into rotational energy in the form of the wheel with no traction spinning like crazy at double it's normal rate.

An LSD on the other hand, in very basic terms puts a preset amount of drag on the output shaft of the diff, so as a result the torque is not equal to zero and power is sent to the wheel with traction as well. It's a little more complex than that when you get into the different types of LSD, but that's the jist of it.

The LSD allows for better use of the available traction, and also allows for better corner throttle control, where an open diff would lose traction on the inside wheel first, and as a result spin it without transferring power to the outside wheel when you get back on the power.
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Old 05-19-2009, 08:42 PM   #17
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thank you for taking the time to explain that to me
much appreciated
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Old 05-19-2009, 10:53 PM   #18
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My pleasure
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Old 05-19-2009, 11:11 PM   #19
Paul540/m3
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No E39 has an LSD except for the M5, Chromius is correct. It is not a matter of just replacing the diff with an M5 unit. The driveshaft, halfshafts and diff all need to be replaced. Ask me how I know .
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Old 05-20-2009, 09:45 PM   #20
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how do you know how
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Old 05-21-2009, 01:23 AM   #21
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lol it was a long search for all of the parts. It may be easier now as there are more used/wrecked/older M5's around.
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Old 05-21-2009, 10:00 AM   #22
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Whats the advantage of an LSD, Paul?
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