Quote:
Originally posted by huntz0r
No, 1/1.5/2-way LSD are clutch types, meaning that clutches (hence) lock together inside to keep both axles moving the same speed. VLSD has no solid parts that contact; it is a plate attached to each axle like this:
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and in between those is a viscous fluid. When the plates start spinning different speeds the fluid creates resistance that brings them back in line. So it actually works more like a 2-way, just less effective and it takes a second to engage, unlike clutch type which engages almost immediately.
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Not reeeallllyyy...
VLSD is 1.5 way, and the fluid doesn't just "bring them back in line" (all fluid is viscous, but different fluids have different levels viscosity; honey is very viscous, while ethanol is not very viscous.) The fluid heats up and expands no matter which direction the 'plates' spin, so it is in the strictest strictest sense (I think?) a 2-way, but it will never be as active on braking as it will on acceleration because the wheels aren't spinning nearly as fast (they're slowing down, and no power is being transfered to the plates/wheels either). Hence it's
effectively (not technically) a 1.5-way.
I'm not 100% sure on why it's a 1.5 way vs. 2 way, but I think it's more along those lines than what others have outlined earlier.