tmak26b wrote:Posi means limited slip, just another term for it. Limited slip just allows your differential to put power from the wheel that spins to the wheel that grips. POSI/LSD/Sure grip do the same job, but using different ways to do it.
Viscous LSD are the worst type of LSD for performance as they are the slowest to react since it uses heat to activate.
Posi/LSD/Sure Grip use different ways to do it? That statement makes no sense at all. Posi and Sure Grip are Chevy and Chrysler's NAME'S for their LSD's. Posi and Sure Grip ARE LSD's. But those names ONLY APPLY to their prospective brands, not Nissan. They don't even do the job differently since a Posi diff and a Sure Grip diff are both clutch-type LSD's. They both do the job differently than a viscous type, if that's what you mean.
Viscous type may be the worst for immediate power distribution but the long term performance and lack of expensive friction modifiers and dead-nuts reliability makes them much more desirable than the other types of LSD, except maybe a gear type, to the average man. 99% of the world's populace don't drag so they don't care of their LSD kicks in at a moments notice. I have also seen many clutch type's catch just as late as a viscous. If you want even power, then buy a locker.
Posi is not another term for limited slip, it is CHEVROLET'S term for limited slip in some of their older vehicles. DO NOT use that word to describe LSD in any other make or you WILL LOOK UNDERINFORMED AND IGNORANT! May seem like a small unimportant detail, but we are in a NISSAN FORUM. Nissan's don't typically have Chevy parts hopping around inside them unless someone got antsy and did some custom mods on their Z.