stock torsen is great and os giken is best. wouldnt recommend too much in between. only upgrade if you are a dedicated race monster car racing other monster cars.

i reccomend the factory LSD.

let us know when you break it road racing....

however; the 4.44 R&P from a rx8 might be a worthy investment for a FD that lives over 4k rpms

Rear end stability/handling with torsen vs. clutch
 

So does anyone have any practical experience with how the car feels going into and out of corners with a clutch type (osgiken or otherwise) vs. the stock torsen? I've been driving the fd so long with it's torsen that i'm curious of what a difference the clutch type would make. I've read threads (in other not rx7 forums) where they talk about cars with torsen's being unstable and that at the limit on a track you're better off with clutch types. That over rumble strips/curbs the tires get air and upset the car as well.

I guess the question is can you compensate for this with driving style and suspension setup? Is this just less of an issue with the rx7?

From what i've read it appears to not have an absolute answer and that ultimately you're better off focused on improving everything else before you even start thinking about it.

Just curious, so thanks for any answers i may or may not get ;)

It's really simple. You get more grip and stability with an OS Giken. In other words, you go faster.

thewird

indycars use torsen . they seem pretty stable. and torsen is awesome in the rain as it doesn't cause a big push

the racing type clutch plate LSD is going to be much better at putting the power down compare to the stocker for sure !! There is no question about it. OS Giken has a smoother power delivery, Kaaz have good US side service. I would pick between these 2 proven ones.

I've roadraced my fd since 1997.

I was running a stock diff with 70,000 kms for over 10 years of dedicated roadracing, with and without slicks. I ran it 4 years with a 20b turbo with 740 rwhp and a nascar tranny and had no problem hooking up the power. Never had a failure or changed any parts in all that time. The car is always one of the fastest cars in the rain while all the guys with lockers and clutch diffs were all over the road. For roadracing there is absolutely no need to change it. My friend runs an ls7 7 litre rx7 fd racecar with the stock differential and the same results. I would spend the money on top grade Penske or Ohlin shocks or some big brakes to go faster and be more consistent.

For those of you running clutch type LSD's for road racing, are you using a 1-way, 1.5-way, or 2-way?

1.5 way is what you want...