O.S. Giken "DualCore" LSD

redondoaveb

I just have mine done with every oil change

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Fast Intentions "Stage Seb" twin turbo #098- Specialty Z/Tial-Xonarotor/CJM/Ecutek/HKS/KW/SPL/Hotchkis/Rohana/Toyo
700+whp

filip00

After this weekend's track day, I gotta say, it's not biting fast enough. I have to get my retuned for more aggressive use. And....just knowing that means dropping the diff AGAIN....

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redondoaveb

Fortunately, for me, OS Giken is about 10 minutes away from me

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Fast Intentions "Stage Seb" twin turbo #098- Specialty Z/Tial-Xonarotor/CJM/Ecutek/HKS/KW/SPL/Hotchkis/Rohana/Toyo
700+whp

prandelia

Getting my retuned diff back today. Looking forward to testing it.

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2014-Nismo 370Z / 2025-992 GT3RS / 2024-C8 Z07 / 2018-991.2 GT3 / 2011-997.2 GT3RS / 2016-981 GT4 / 2013-E92 M3 / 1988-E30 M3 / 2015-FRS - GLTC race car

OptionZero

Just reading through some diff threads for other platforms

BMW M3 crowd has a guy that is a diff expert, tests off the shelf and builds custom setups.

consensus from track crowd was that OS Giken did not lock hard enough out the box and needed to be upgraded to more aggressive specs

interesting because I had not heard that from z34 track guys - who, to be fair, may not be putting out the same power

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OptionZero Build Thread

Rusty

Mine needs redone.

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"The Difficult Anytime, The Impossible By Appointment Only"
http://www.the370z.com/members-370z-...o-journal.html

Spooler

I went that route. Tuned by OS Giken themselves.

OptionZero

so it really is a bit too "soft" out of the box?

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redondoaveb

According to the OS Giken techs when I sent mine in for tuning. It's tuned for stock power and aggressive street driving

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Fast Intentions "Stage Seb" twin turbo #098- Specialty Z/Tial-Xonarotor/CJM/Ecutek/HKS/KW/SPL/Hotchkis/Rohana/Toyo
700+whp

prandelia

Yeah, I sent them my dyno graph and all associated info for my setup, so I expect the new "tune" to be much, much better.

I'm actually surprised by their soft initial setting. Most of their other OTS setups for many other car makes are great for track use. Oh well, live and learn.

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2014-Nismo 370Z / 2025-992 GT3RS / 2024-C8 Z07 / 2018-991.2 GT3 / 2011-997.2 GT3RS / 2016-981 GT4 / 2013-E92 M3 / 1988-E30 M3 / 2015-FRS - GLTC race car

prandelia

I keep up with the E92 M3 crowd, and general consensus for the most part is the Giken OTS setup is great for track use. Some of that is because almost all owners don't really spend alot of resources to make much more power over stock, they focus on handling. Also, that car is tire limited really due to the body design. The exact opposite is true for the Z, most owners try to make considerably more power over stock, and the car can easily be over-"tired" due to the big body design. For the tire we can stuff under this car, it really needs to be making like 375 whp+. Not feasible for us NA track guys, unless you want to build a crazy 3.8L like the GT4 cars in Europe ran!

I've got a spare diff pumpkin just waiting to be rebuilt with a Giken for my M3, but just haven't gotten around to it. Knowing this though, I will certainly check into it before pulling the trigger for that car.

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2014-Nismo 370Z / 2025-992 GT3RS / 2024-C8 Z07 / 2018-991.2 GT3 / 2011-997.2 GT3RS / 2016-981 GT4 / 2013-E92 M3 / 1988-E30 M3 / 2015-FRS - GLTC race car

filip00

Being a Z34 owner with an OS Giken that I track often, and I think it's not biting hard enough....I think it has also to do with the fact that I've got a 4.08 FD, meaning the car is behaving as if it has a bit more power than stock.
That being said, the diff works well, it only locks up slower than I'd like if we're talking about a very sharp hairpin corner and I wanna drive through it like a maniac.

I had a call with a diff specialist from the Netherlands where I bought the OS Giken unit, and they said it's not a problem to tune it to bite earlier at all. You just need to swap out the negative preload springs for softer ones and that's it.....but to do that, you need to disassemble EVERYTHING.

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