tcengel

I have a question. Which would be better for us turbo guys that really can't use first or second gear? I realize that LSDs do the most good in the corners, but what about off the line?

jsg93085

better tires would be your only solution for off-the-line traction in first and second

or a boost controller like the Apex'i AVC-R (gear dependent boost levels)

paul_dezod

A nice FAQ on the unit:
http://www.osgiken.net/faqs.html#200903_03

chicotunner07

definitely sounds like the way to go for racing applications!

draxcaliber

oh goodie, really want to see what dan thinks of the difference between the two differentials...

stevejohns29

watching..

paul_dezod

We will be running this in our tC! ;)

ScionGT35R

____!!!!! I just bough a TRD last week.

coryjames

so this is more like a locker right? its a power depending positive lock?

Drey

iTrader: (4)

Weren't you using Phantom grip LSD before?
I had trd lsd installed 2 weeks ago and I'm loving it Taking corners is so much fun now.

ScionGT35R

Yeap!!! I decided to change to a TRD. Phanthom doesn't work at my power level.

rhythmnsmoke

Couldn't imagine it would.

ScionGT35R

When I start this project I wasn't thinking of reaching 500whp that's why a Phanthom was good enougth.

rhythmnsmoke

^^lol...same here. When we even bought the tC, I wasn't thinking of smashing on Evo's and the like...

paul_dezod

Nice cut-away depiction of this diff:



Also, animated version of it.

chicotunner07

it doesnt fall apart like that when its in the transmission? does it....

LOL J/K

so did this just come out overnight? seems like no one was expecting it, lol

Ace83

iTrader: (6)

looks so nice make me wanna get, i dont even need it haha

paul_dezod

It's been in development for the past 8-10 months. We kept it real hush hush

adg016

For those of you with the TRD, rest-assured you have a good, solid diff that will likely never break or cause you problems. We raced on it for 2 seasons with zero issues.

That said, a Quaife, Torsen, helical, or other gear type differential is literally NOT a limited slip diff. They are more accurately referred to as "torque-biasing." They are selected for their durability and seamless operation.

For cars making serious power, or for ANY type of performance application such as AutoX, time attack, road racing, a diff that actually locks is the ONLY diff you'll want to use. The performance is astonishingly better.

As last season wound down, it was probably our single biggest development goal, to work with a company to produce a true LSD that would lock-up hard, and further reduce or even completely eliminate wheelspin.

We selected OS Giken because of their reputation, especially in Japan. Road race cars in pro Japanese racing series have won championship with that type of differential. They also don't believe in 1.5-way units for FWD applications, as that will cause the car to push on turn-in. This is the last thing you want in a FWD car.

The units are 1.1-way, meaning they are open on turn-in, and only go to lock once power is applied. OS also uses more clutch plates than just about anyone in the world. Unlike other clutch-type diffs, they very infrequently need to be rebuilt.

This is all to say, we worked with Japan and the US arm to develop this differential. We tested more than one setup at the track in the off-season. The units are completely rock-solid. The fitment is near perfect, and it's somewhat imperceptible during normal driving.

Under spirited driving, this diff is second to none. It's virtually eliminated wheelspin, something that was still a problem with the helical unit. Throttle can be applied earlier and to a greater degree, which resulted in very real laptime reductions. The car is a rocket out of the corners now, and the power just gets down to the ground once locked up. Hills, rises, tight hairpins, nothing seems to affect the diff. It just works!

Unlike a helical, when one tire loses contact with the track surface, it still remains locked, sending power to the outside tire. This isn't the case with a helical. In the aforementioned scenario, the diff will act like an open differential and copious wheelspin will result.

OS is a great engineering company. Hardcore racers know their name, but they don't have a lot of marketing muscle here in the US. This really is a "best-kept secret" kind of thing. We're happy to bring the unit to market, and can't wait to hear what you guys and gals all think. This is a huge performance upgrade over the stock diff, and a big improvement over what was previously available.

The forced induction crowd really shouldn't be without it, and even NA cars can benefit significantly.

chicotunner07

awesome review! definitely would consider this for my future plans!