O.S. Giken "DualCore" LSD

OptionZero

Haven't seen this discussed here; seems like discussion has centered on the 1.5 Way (plus cooling)

Apparently OS Giken makes version called "DualCore" which is a Torsen combined with a clutch-type diff. With wheels on the ground, it acts like a Torsen; if a wheel lifts, it locks and becomes a clutch type:

https://www.osgiken.co.jp/DualCoreLSD/

It is listed as available for Z34 (if i'm reading this correctly)
https://www.osgiken.co.jp/pro_lsd/nissan.php

Almost new reviews available in English

Thoughts on this?

It may simply come down to whether it locks hard enough on power, but in theory this seems good for cars that see track/street duty.

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Rusty

This is news to me. Sounds like a good idea.

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Rjk370z

Sounds like someone is shopping for a lsd.

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Tractionless

How often does a wheel lift?

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filip00

If you push it, basically on every tight hairpin.

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DarkJak

So this is suggesting the normal OSG will have less than 100% lock if a wheel is lifted. It hasn't bothered me, but seems like it'd add just a tad more consistency.

The only time I've noticed wheel slip under wheel lift is low load lift like angling up a driveway. At the track, I think the lift has been short enough that I can't tell I'm spinning the inside slightly, because I'm still getting power to the outer wheel.

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OptionZero

If i'm reading you correctly, you're saying the normal OSG 1.5 way clutch type won't lock at low speed situations?

but this Dualcore version will, due to its gear type engagement on acceleration?

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Spooler

No, it locks all the time. That's what I saw at the Tail of the Dragon. Now, If you have 900whp you can have the 1.5way tuned by OS Giken in the states. I had my last diff tuned by them for 900whp. It is only $150 to have it done. It is tuned in California. Why did I have it tuned? Because my old 3.69 OS Giken diff would one wheel peal on me in the right conditions. The only downside is the OS Giken diff fluid won't help the LSD shuffle under tight turns. You got to give to get sometimes.

filip00

As a 1.5 OSG owner let me chime in.

At super slow speeds, doing a parking lot turn, the inner wheel sometimes locks up and chirps. Not often, but sometimes.

If it's a normal corner, drifting is easy, controllable, both wheels lock up as they should, all good.

BUT. There is a situation where the OSG is not acting well.....namely, uphill hairpins. Whenever I was driving an uphill hairpin, and if I approach it normally, slightly too quickly and want to just powerslide through it, the inner wheel WILL SPIN for a brief second, after which it locks up, and spins the outside wheel, acting normally. But this will happen. And I tried and tested it over and over. It's just how it acts.

My preload is factory:

338kg of negative preload (Pressure preventing lockup)
25/38 degrees ramps (coast/accelerate) Angle of 10 active clutch plate sets.

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Tractionless

Good to know, I'll have to keep my eye out for some pics!
It actually happened to me this weekend in a parking garage with a large ramp elevation change and the OE LSD pulled the Z up on the LHS side wheel without issue haha.

At 102k miles on the OE LSD i'm figuring on it needing replacement in the near future but the subject OS Giken unit seems like overkill for spirited mountain corner carving.

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