| Re: [GMCnet] limited slip differential [message #87922] |
Thu, 10 June 2010 09:54  |
jayrabe
Messages: 509
Registered: June 2009
Location: Portland, OR
Karma: 0
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Thanks Gary & Carl and others that responded. One thing about your explanation Gary, saying LSD benefit on wet grass won't be as much as if there's more difference in traction between the wheels, yet one comment from Auburn was that those coaches with LSD had no problem on the wet grass there, so my conclusion is even if wet grass with about the same traction on both tires doesn't give you maximum benefit from the LSD, it's still a significant benefit. I guess bottom line I'll keep the LSD on my list.
Thanks again.
J
76 PB
Portland, OR
> Date: Thu, 10 Jun 2010 02:47:57 -0700
> From: casey.gary@yahoo.com
> To: gmclist@temp.gmcnet.org
> Subject: Re: [GMCnet] limited slip differential
>
> I agree with Carl's conclusion below, but I think some of the explanation is possibly misleading. The whole purpose of a limited slip differential is to apply different torque to each wheel, not the same. An "open" differential will, except for internal friction, apply equal torque to the wheels. If one wheel loses traction it will spin, but the other won't. Resistance to side loading (steering, etc) exists only if the wheel is not spinning. Therefore, an vehicle with an open differential will be have more "normally" since when one wheel spins only half the side traction capability is lost. With a limited slip differential both wheels will usually spin at the same time and therefore loss of steering/side traction will be lost all at once. As far as forward traction one way to look at it is that with an open differential the forward traction is twice the traction of the LEAST tractive wheel and with an LSD the traction is the sum of the lessor and
> the greater traction. Therefore the tractive benefit of LSD is greatest when the traction is most different (like one wheel on ice, one on dry paving) and is zero when both wheels have the same traction(example: if one wheel is on ice and has a tractive capability of 100 pounds and the other, on dry paving has 900 pounds and open differential will give you 200 pounds of traction. An LSD will give you 1,000 pounds. On the other hand when on wet grass one wheel might have 300 pounds and the other 400. The total traction would then be 600 vs. 700 pounds, not much difference).
> Don't know if that is any clearer than Carl's description, but there it is.
> Gary
>
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| Re: [GMCnet] limited slip differential [message #87923 is a reply to message #87922] |
Thu, 10 June 2010 10:07  |
Carl S.
Messages: 4186
Registered: January 2009
Location: Tucson, AZ.
Karma: 13
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Senior Member |
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< I guess bottom line I'll keep the LSD on my list.
I think that's a good idea Jay, It's definitely on mine.
Carl Stouffer
'75 ex Palm Beach
Tucson, AZ.
Chuck Aulgur Reaction Arm Disc Brakes, Quadrabags, 3.70 LSD final drive, Lenzi knuckles/hubs, Dodge Truck 16" X 8" front wheels, Rear American Eagles, Solar battery charging. GMCSJ and GMCMI member
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