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3-Series (E36) Chat relating to the BMW 3-Series from 1992-1999. Autodoodad Specific models include: BMW 316i, BMW 318i, BMW 318iS/ti, BMW 320, BMW 323, BMW 320, BMW 324, BMW 325, BMW 328.

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Old 11-29-2004, 04:45 PM   #1 (permalink)
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Well as you all know there's a way to figure out if you E36 is equiped with LSD (if you lift up your car and spin one rear wheel the other would spin in the same direction or i guess is the other way used ).

Ok so i have this question (may be stupid but i'm curious about it). If you car doesn't have LSD, then all the torque is just on one wheel? (all the time?)
Ex: a 318 has aprox. 130 lb of torque, so all that torque goes on one wheel, or is it spit 50/50 for each wheel ?

I'm so used i just wanna know how this works!!!!
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Old 11-29-2004, 08:03 PM   #2 (permalink)
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When you are speaking of an open differential.. it is 50/50 split...

Go here to learn....

http://auto.howstuffworks.com/differential.htm

Have fun,

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Old 11-29-2004, 08:08 PM   #3 (permalink)
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that website should be pinned, you can learn so much
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Old 11-29-2004, 08:15 PM   #4 (permalink)
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In optimal conditions, the open diff is 50/50. When one wheel has less traction than another, more power goes to that wheel with less. This is good, except in rain/snow/ice/mud. Also, when peeling out one wheel will grab all the power.
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Old 11-30-2004, 12:20 PM   #5 (permalink)
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So is LSD an open diff?

Because one day i took off on a slippery road and i felt that one wheel spun, therefore i concluded that i have no LSD.

So does it mean that my car has all the torque on one wheel?
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Old 11-30-2004, 07:23 PM   #6 (permalink)
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No, LSDs provide a 25/75 power lockup. One wheel will always get at least 25% of the power.
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Old 11-30-2004, 10:03 PM   #7 (permalink)
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Read the howstuffworks article and examine the diagrams they have until you understand it.

The device was invented to eavenly distribute the power to each wheel, AND allow the two wheels to spin at different speeds. (this is a requirement for turning, esp while moving slow and turning hard into a parking spot) The problem with the origional design was, if one wheel looses traction, EX: one wheel is on ice, the other wheel is on pavement, ALL the power goes to the wheel on the ice since it's the easiest to turn. The wheel starts spinning like crazy, and your car goes nowhere.

If you have a broken RC car, take it apart and crack open the little diferential it's got. Odds are, unless it's a really expensive RC car, it's an open differential like yours and you can play with it with your hands and really understand how shity these things are compaired to limited slip differentials, which combat the traction problem and allow you to do burnouts and drift

A quiafe differential is pritty cool to, it's a LOT harder to wrap your head around how it works because of it's complexity. ...and it does have one flaw that makes it unsiutable in certain situations, it's also got a bunch more gears and moving parts to break.
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