Mine goes south after about 10 to 15 minutes on the track. After it cools, it will come back. :icon14:

Wavetrac for DD, and track. The more track time. Then Cusco or OS Gekin, which you can tune.

I wonder if this can be a warrantied item if one has an extended warranty? Without doing a burnout where there's only one tire mark, how else does one check lsd operation?

Good question. Wonder what the dealer does.

Umm.. am I reading this correctly? You guys are saying that the vlsd is only as good as the vlsd oil inside. Even if you change the oil for the vlsd, it is still toasted after 60k miles? This is because the vlsd and the oil in the pumpkin is separate from the vlsd? I have open my diff cover 2x. I never seen any separate oil inside. I'm no expert or anything like that but I'm 99% sure that changing the diff fluid is all that is needed to maintain the vlsd.

YzGyz

The VLSD fluid is silicone based. It it inside the ring gear carrier. Which is a sealed unit. There for separate from the gear lube. Changing the gear lube will have no effect on the silicone fluid in the ring gear carrier. The only way to change the silicone fluid is to get the whole ring gear carrier, because it is a factory sealed unit. So if you are going to do that. You should just go with an aftermarket LSD which is cheaper. Unless you find a factory VLSD on flea-bay. Most of these are toast to begin with. What happens is the silicone fluid breaks down over a period of time. Trackdays SPEED up the process. If you are into :driving:. It will break down quicker then say normal sane DD.

I wonder it too.

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One of many reasons why I bought a base model Z. Even when new, the VLSD is basically useless (open) after it heats up. Why pay extra for something like that?

When the time comes, I'll get the Tomei 1.5 way LSD, and upgrade to the 3.90 ring as well just for a little added "oomph".

Ahh, I see.

YzGyz

OP you don't have to wonder, Rusty just explained it to both you and yzgyz

Well I know the vsld doesn't engage after heat up but I'm not really sure it wears out? From my understanding (zero vlsd experience but enough corvette clutch type) the vlsd works similar to something like a AT torque converter (without a TCC luck up clutch). Really no moving/ friction parts to wear and silicon fluid can take a ton of heat cycles. I'll trust others who've experienced it fail but I was just planning to get a z1/ nismo diff cover to help keep it cooler longer (not competitive enough to buy a Gilken).

I read it after my posting. Thanks.

:D

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When new, the silicone fluid is thick. As it heats up. It becomes thinner. That's why during a track session. People noticing it going away. After cooling off. It comes back Now after so many miles. The fluid becomes thinner as it wears. That's why you read about people noticing the change in it's action. Once it wears, it doesn't come back.

I grasp the concept I'm just surprised the fluid breaks down so quick with no real debris exposure etc. not doubting it just surprising. Sucks I guess one more thing to plan on buying down the road, probably do a quaif/wavetrace type.

It's a polymer so mechanical shearing and heat will break down the polymer chains over time.