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Old 12-07-2006, 12:58 PM   #1
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Question viscous lsd - what's inside?

Has anybody cut one of the 1.6 viscous lsds open? I'm wondering what's inside, what wears, and if something can be done to improve the lock up. Something comes to mind is draining and then filling the unit with a thicker fluid.
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Old 12-07-2006, 01:03 PM   #2
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http://www.miata.net/garage/vlsd.html

Here is a description in the second paragraph. I have not seen one cut apart.
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Old 12-07-2006, 01:51 PM   #3
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That affirms what I've read elsewhere about other OEs, so the Miata's is the same. You would think that if the fluid is doing the lock up and the plates are only for shearing the fluid, then a higher viscosity fluid would improve the lock up. The question is, would the existing fluid actually drain out if you drilled a hole? I've got one, trying to decide to sell or hack. My hope lies on the fact that a lot of the awd cars use viscous as a center diff and upgraded viscous units are offered.
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Old 12-07-2006, 02:30 PM   #4
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Quote:
Originally Posted by m2cupcar View Post
That affirms what I've read elsewhere about other OEs, so the Miata's is the same. You would think that if the fluid is doing the lock up and the plates are only for shearing the fluid, then a higher viscosity fluid would improve the lock up. The question is, would the existing fluid actually drain out if you drilled a hole? I've got one, trying to decide to sell or hack. My hope lies on the fact that a lot of the awd cars use viscous as a center diff and upgraded viscous units are offered.

I just tore an open diff and a viscous diff apart and rebuilt one working diff. I'm not that knowledgeable in cars, so I'd have a hard time understand the question and replying... By lock up, do you mean the play between the pinion gear and the ring? These can be adjusted side to side with these little "turny discs" (as I call them :-)) to give it more or less play.

Prob makes no sense what I'm saying, maybe it helped to answer your question. :-)
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Old 12-07-2006, 05:02 PM   #5
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Lock up - as in how much power is delivered to the wheel with traction. Best case a Miata delivers something like 15% to the wheels with traction. I did just learn that the what's in the viscous is a silicone type gel, so there will be no drilling and draining.
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Old 12-07-2006, 07:55 PM   #6
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The play between the pinion gear and ring gear is called backlash.
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Old 12-07-2006, 09:20 PM   #7
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btw- turns out the stuff in the viscous is very similar to silly putty. Though using silly putty in the diff, may turn the putty to a solid given it's starting state.
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Old 12-11-2006, 09:47 PM   #8
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And liquid towards the end of it's useful life?
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Old 12-14-2006, 02:23 PM   #9
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you could always drill 2 holes, use one as a drain and send some paint thinner through it at pressure. tap the holes, fill with whatever you wanted to upgrade to and plug them?
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Old 12-14-2006, 02:54 PM   #10
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I have a spare VLSD if anyone wants to play.
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