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Old 07-04-2007, 12:13 AM   #1
redl1newrx
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Default helicial vs mechanical LSD

whats the differences???
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Old 07-04-2007, 12:17 AM   #2
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Old 07-04-2007, 12:25 AM   #3
redl1newrx
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explain in english please...
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Old 07-04-2007, 12:38 AM   #4
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Well John, from what I read here:

The use of the word mechanical implies that the limited slip differential is engaged by interaction between two (or more) mechanical parts. This category includes clutch and helical limited slip differentials. For road racing, many prefer a helical limited slip differential, because it does not lock the two output shafts to spin at the same rate, but rather biases torque to the wheel with more grip by up to 80%

Helical and mechanical are part of the same type.
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Old 07-04-2007, 12:39 AM   #5
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If you are looking for a diff that is different, it would be this:

Viscous

The viscous type is generally simpler, and relies on the properties of a dilatant fluid - that is, one which thickens when subject to shear. Silicone-based oils are often used. Here, a cylindrical chamber of fluid filled with a stack of perforated discs rotates with the normal motion of the output shafts. The inside surface of the chamber is coupled to one of the driveshafts, and the outside coupled to the differential carrier. Half of the discs are connected to the inner, the other half to the outer, they alternate inner/outer in the stack. Differential motion forces the interlocked (though untouching) discs to move through the fluid against each other.
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Old 07-04-2007, 12:40 AM   #6
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IIRC helical is a mechanical differential.

edit: I am too slow!

Maybe he is better off reading this: http://auto.howstuffworks.com/differential.htm
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Old 07-04-2007, 12:43 AM   #7
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Quote:
Originally Posted by RawCode View Post
IIRC helical is a mechanical differential.

edit: I am too slow!

Maybe he is better off reading this: http://auto.howstuffworks.com/differential.htm
Wow! What a find!
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Old 07-04-2007, 12:44 AM   #8
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here is a thread in the driveline forum FAQ too: http://forums.nasioc.com/forums/showthread.php?t=423584
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Old 07-04-2007, 12:52 AM   #9
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I recall reading in SCC a long time ago that the fluid in a viscous differential could also be described as thixotropic. I believe it's a synonym for dilatant.

No, I'm not going to bother looking it up.

As for which is better, I've driven a Quaife ATB diff (all gears, no clutches) and a Honda OEM clutch-type diff in very similar cars (1988 CRXs) and I strongly prefer the clutch-type. The Quaife caused serious understeer under throttle. The clutch type was a little more forgiving.
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Old 07-04-2007, 12:55 AM   #10
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Old 07-04-2007, 01:01 AM   #11
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Haha John. Any more questions?
I say this will teach you what you need to know.
And how to use the search function maybe? lol
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Old 07-08-2007, 12:41 AM   #12
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do a spool john!!!!

sam
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Old 07-08-2007, 01:04 AM   #13
EvolvedAK
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Quote:
Originally Posted by Firestrike View Post
And how to use the search function maybe? lol
Don't even start
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