i have evidence that some t2s came with an open diff well at least in japan.for the last couple years here in s.florida there have been instances where people have bought t2 rear subframes from reputable companies and one wheel would only spin, or they would break the diff, well it happened to me today and i took apart my diff as well as a couple others from people who have had me install new pumpkins in they're vehicles, and to my surprise same final answer open t2 diffs.Anybody over seas ever run into this?i can send pics to someone if they wanna host it. i guess be careful if your purchasing j spec t2 rear ends ask the seller to verify for you.

 

I find this extremely hard to believe.

Swapped out between when they were built and now? Possible. SO worn they seem like open diffs? Possible also

Were they 7" ring gears?

 

i have pictures to prove it,as i said i beleive this was a home market type of thing maybe.i heard this years ago but never encountered it my self u ntil now.my diff was an s5 t2 j spec and my buddies was as well the other 3 were s4, and the ring gear, inner axel stubs, pinion gear and everything associated were all turbo specific parts.

 

And they weren't just worn?

 

Yep, the "base model" GT-R's didn't come with LSD's.
The more expensive GT-X's did.


-Ted

 

Yes, I made the foolish mistake of pullung one from the wrecker. Came out of a S5 T2. Damn I was pissed when my FD Diff did not fit into it.

 

I'll host them up if you want me to. The image size will automatically be reduced down to 800x600 though

 

so the GT-R's didnt come with LSD and the "expensive" GTX models did... what type of LSD did they come with?

 

aren't lsd rear ends tagged id plate?

 

interesting very interesting lol

 

All are clutch-type unless you're lucky to find an Infini (IV only?) that came with the Torsen one.

Also, most of the Japan FC's came with 4.30 rear ends...


-Ted

 

That is exactly right....

I own a GTX from japan which i imported myself.. and i did a lot of researh on whick japanese model was the best.

http://english.auto.vl.ru/catalog/ma...a_rx-7/1990_6/

Check it out.


So my car is a late 1991 GTX.. does that mean i have the torsen diff

What exactly does the 4.30 rear end mean... is that the final drive? And that is the shorter gear ratio correct? as in more acceleration and less top speed?

Thanks,

Ben

 

Generally speaking, s4 turbos came with clutch pack diffs (pretty mucha 1 way mechanical LSD) and s5 turbos came with viscous LSD.

 

I think some euro TII's did not have LSD

 

Nah, the Torsen was only Infini IV specific.



Shorter rear end ratio...
Yep, quicker acceleration but less top speed.


-Ted

 

Actually, if you look at the diff design, it's a 2-way...


-Ted

 

Really? Thats interesting.
Most of the s4s that I've driven feel like a 1 way, though I would like to say most of my dealings have been with Japanese and Australian delivered s4s. Might not be much difference, but you never know.
The rotary workshop I deal with and most other people I speak with say it's a 1way.

 

Yeah, it does feel like a 1-way, but if you look at the case, it's obvious that it's a 2-way.


-Ted

 

Actually a lot of Japanese FC's came with an open diff. The only Japanese FC's that had an LSD were the GTX (very common) and Infini (very rare). ALL TII's, as sold in the US, had an LSD. And there's no such thing as a "Turbo II" from Japan. It's a model name that was not used there.

Neither did the top-of-the-line GT-Limited and Cabriolet (a.k.a. Convertible) models. Only the GT-X.

Not according to HyperRev magazine, which says they all had 4.1:1 diffs (including the autos). Mine's definitely 4.1:1 because I counted the teeth.

An FD centre should fit into an FC Turbo diff housing fine, mine did. What was wrong?

Clutch in S4's and viscous in S5's, just like US FC's. The only exception was the Infini's Torsen diff that was inherited by the FD.

 

What the FD guys here are doing is using the FC diff/guts in the FD diff casing. It supposedly holds up better to drag racing and high power. However, apparently the series 5 diff will not work, only the series 4, due to some internal construction difference...some pin or piece of metal prevents the longer FD axle stubs from inserting fully into the s5 diff.

Also, why is it that the FC guys want to convert to FD diffs because they are torsen (as demonstrated above), but the FD guys want to convert to FC diffs because they are clutch type?

 

Wow, I didn't even know it could fit, they look so different. Now I regret chucking my empty FD housing in the trash...

FD guys only need the S4 diff if they have tons of power and like drag racing, and so need the extra strength. FC guys have worn-out or blown stock LSD's and need and cheap and effeective replacement. Up to the point where strength becomes an issue, the Torsen is a better diff for a street car. Horses for courses.

 

Because FC guys think torsen is amazing and the FD guys know they break?

 

Yep, cause the clutch-type LSD's handle more abuse.
The Torsen EXPLODES when pushed too hard.


-Ted

 

yea yea i know turbo2 was not a model in japan all jap fc's were turbo blah blah, thanx for everyone with info on this i didn't think it had ever been brought up before.now to think everyone who has purchased a j spec rear end some of which thinking they have lsd in there car .sucks at least look out for the lsd tag on the fill plug if a question arises.

 

More FC guys road race and autox than FD guys?