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R33 Diff?

jjman
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jjman Mentor

jjman

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Hi all,

just got a question regarding the diff in my R33 GTST. Basically im trying to work out if it is a stock diff or an aftermarket one.

As its a 1993 GTST I would have expected the diff to be fairly old and worn. But it has always been tight as and will even lock turning a tight corner of more than about 120 degrees.

Iv also done a bit of track work and otherwise aggressive driving and the diff will also lock under strong deceleration- i.e, shifting down to 2nd getting ready for a corner.

Is this the behaviour of a stock diff albeit in good condition or would it perhaps be aftermarket or shimmed?

cheers

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jjman Mentor

jjman

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Seeing as the stock diff is a viscous unit that is about as solid as a bag of mouldy noodles......what do you reckon?

haha, exactly. But Im not the type to assume without decent rationale.

I suppose id want someone with extensive experience to come forth and say something like- would have to be different modified as a stock diff will not lock the rears under deceleration...

If it is also worth noting I also have a high quality synthetic oil in the diff. If that would make a difference to make a stock diff work better/ like what I am experiencing...

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GTSBoy Grand Master

GTSBoy

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The standard VLSD barely has any LSD action under accelaration let alone decelaration. I have driven a few and would never say the phrase "locked the gears" in relation to the way they drove.

And no. There is nothing that a different oil would do to make the VLSD seem any different. The viscous cartridge is a sealed unit. It has its own silicone fluid in it. You have to remember, the VLSD is not really an LSD in the sense that mechanical ones are. There are no friction plates/cones or ramps or any of that other stuff in there. There's just a CW&P, some spider gears, and a viscous cartridge that tries and fails to even out the torque between the two wheels (with any more than stock RB20 torque applied to it).

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