Confirmed Torsen Differential
 

I'm happy about this!

"Good news! :) Toyota 86 will feature Torsen LSD and gearbox is from Toyota Altezza / Lexus IS (automatic from IS-F), so we already have tons of spare parts. Almost all suspension is the same as Impreza"

Me gusta torsen...

the automatic in the IS-F has eight gears

http://en.wikipedia.org/wiki/Lexus_IS_(XE20)#IS_F_SPDS

I´m pretty sure they mean IS 250 or IS 350

I want to know if they are using the Subaru r160/r180 diffs. If so, then we will have plenty of aftermarket support out of the box.

If the auto is from ISx50, this car fail so bad. It's slow(lag), and unresponsive. From what I have heard, the 6spd auto is based on 8spd from IS-F. The one similar if not the same as 2013 GS.
Manual one is based off IS300's tranny, but I think the one in FR-S/BRZ is upgraded version.

Cool.

If it's an existing diff that gives more opportunity for aftermarket options like OS Giken, Quaife, or whatever you prefer.

I seem to recall it being mentioned to be Toyota piece, but I could be wrong. It wouldn't be an R160 or R180 though, those are much too weak for a RWD car. They are Nissan diffs, and the last time either of them was used in a rwd production car was the 510 and the original 240z respectively. If they were going to use a Nissan diff, the obvious choice would be the R200 (silvia/240sx, n/a 300z) as it is quite strong, and is an easy transplant into the Impreza rear subframe.

This is great news.

If by "easy transplant" you mean hours of cutting, welding, and relocation, then yes. :D

I don't really care if it's a Subaru piece, I'm just looking for reliability and aftermarket compatibility.

My mistake. I knew the mounting points were the same, but didn't realize there were clearance issues.

Its neither:

http://photos.motoiq.com/MotoIQ/Proj...060325-2-M.jpg

I'm not sure exactly what it is, but folks on that MotoIQ page said its from an IS350 or something. Is that an R200?

I've been doing a bit of reading.

The pumpkin is from the IS, but the differential itself is very likely to be the same one that comes in the IS-F. The IS-250/350 have open diffs as far as I can tell, while the ISF comes with a torsen. Aftermarket-wise, there are currently replacements available from OS Giken and Tom's. And if the ring/pinion gears are as strong as those in the IS's, there shouldn't be any need to worry about it's strength.

I'm very happy about the Torsen.

My first post here :) I actually just joined to ask what kind of diff this car will have - really good news about the Torsen! I assume this will be the same for both variants (BRZ and GT-86)?

I currently drive a BMW 1-series coupe (120d), and fitting a Quaife diff in it last year completely transformed the car! Made this vid right after the run-in period was over, hopefully the GT-86 will be at least as happy to powerslide ;)
[U2b]fLFupcWTdAs[/U2b]

Judging from the picture, the differential (case at least) looks to be the same, or similar to the 205mm F20TX differential from the '01-05 IS300. The 208mm differentials used in some of the larger RWD Toyota/Lexus models have a much wider front mounting, and the IS F's differential case has significant external cooling fins. The 208mm (and older larger differentials like the 220mm in the JZA80), use a 3-bolt dampened pinion flange as well, while the 86 seems to be using the smaller, more common non-dampened 4-bolt design.

The 205mm differential is the same as the older Toyota 8-inch rear end used in cars like the A70 Supra, etc., so aftermarket differentials will likely be relatively easy to get right off the bat. Not that the T2 (if that's what it is) will be bad, I love the T2 I've got in my IS250.

Here are a few pictures showing how similar this is to the F20 differential (both open and LSD) from the IS300/IS250:

IS250 factory F20SX / FD20A Semi-Limited Slip Differential:
http://jeff.epicwelding.com/is250/is...s300_lsd13.jpg

IS300 F20TX / FD20AT Torsen T2 Limited Slip Differential:
http://jeff.epicwelding.com/is250/is...is300_lsd9.jpg
http://jeff.epicwelding.com/is250/is...s300_lsd16.jpg
http://jeff.epicwelding.com/is250/is...is300_lsd1.jpg

Using this Toyota differential is a good thing, this will take more abuse than most any owner will ever throw at it.

Jeff

I mentioned this in another thread, but Torsen only makes four models of differentials: T-1, T-2, T-2R (Racemaster), and T-3, and they are found in a wide variety of cars. The T-2 is found in the IS, LFA, Imprezza WRX STi, Genesis Coupe, the Mustang Boss 302, etc., and will be in the 86/BRZ/FR-S.

And for what it's worth: JTEKT Torsen is part of the Toyota Group.

Anybody notice Tada commenting and saying with reference to the Impreza suspension;

This right here, is truth.

Did not click on that video expecting that musical intro. :lol: :clap: Good stuff.

Going to be hard to find a good tune for the GT86, strangely enough very few people make songs about Toyota's...!

Unless you're w2w racing, the Torsen is all the LSD you need.

from the motoiq article the state that its from a is300

So pricing on those (8XX-1XXX) not terrible

Wasn't the is300 transmission made of wet toilet paper over about 300 whp?

Even if it was, what does that have to with this thread?

Jeff

I disagree. Different LSD styles offer varying chassis control characteristics. An ATB needs both wheels to have some grip, otherwise it reverts to full-open. A clutch-pack style needs wheel speed delta between the driven wheels to start locking. In my experience, ATB's work best in the front axle, and clutch-packs work best in the rear axle. Of course, if you're racing, opinion is irrelevant and only lap times matter. On the street, however, perspective and chassis feel are the only relevant statistic. Nevertheless, in a rear-drive car, any LSD from the factory is usually better than an open-diff.

I personally loved Torsen overall, it had good performance and average usability. Much of my Torsen experience was from the FDrx7 and miata. But when it came to track days i found the clutch pack LSD in my FC was more suitable for the task.

It depends what kind of racing you're doing, IMO. I've driven quite a few of both types, in various cars and they all have their strong points. Road-racing with a Torsen is a delight though, which is why I put the T2 in my IS.

Torsens are great OEM LSD's, they're quiet and feature very smooth engagement. Especially for a Lexus, etc. they're perfect. I think most Toyota/Scion owners would appreciate that. Anyone else would likely want a differential with much more lockup, and would probably not care much for a smooth OEM-style clutch-type LSD anyway, and would look aftermarket anyways.

I've got a TRD 2-way for my AE86, it's going to depend on what you want to do with this car, but with it being an existing Toyota differential, options will be relatively plentiful. I'm sure the A70 Supra guys are liking the fact that new options may soon exist for their cars as well.

Jeff

Well genius. The first page only has 5 posts that mention the transmission. Sorry if I strayed from the differential topicto discuss transmissions in the drivetrain portion of the forums.:thumbsup:

Sorry, you didn't quote anything specifically, so I wasn't sure how it tied into a differential thread.

Still, the IS300 used a W55, which is actually a relatively beefy transmission compared to some, and while some may have had issues around 300rwhp, most push it further, and that is behind an engine that will put out a lot more torque at 300rwhp than a 4-cylinder would.

It's a relatively moot point though, since the FR-S/BRZ/86 appears to be using the AZ6 (Toyota code J160 in the Altezza when used behind the 2.0L 3S-GE and 1G-GE), which is a lighter-duty transmission than than the W55 even, likely due to wanting a lighter weight transmission.

So while the IS300 transmission could take however much power, it actually doesn't matter in relation to this car, which uses a lighter-duty, lighter transmission.

Jeff

Good news!, i like Torsen. :burnrubber:

I like this news beefy rearend & lsd but for me as soon as I'm done paying & warranties are done its going to be KAAAAAZZZZ

I thought the IS300 had an aluminum-cased W58? Or is that what the W55 is?

W55 is a W58 with minor differences.

Wait, I am really unfamiliar with these tech stuff, but does Torsen mean you can drift easier, and drive safer on terrains like mud or snow?

The W58 is also aluminum case, the W55/W58 are the same design, just different gear ratios. Depending on the year, there are various synchro/gear/shifter differences, however the difference between a W55 and W58 is the gear ratios.

Jeff

Awesome, thanks.


Back to the Torsen, is it true that they can be fragile on road courses or rough streets? I've heard that they will break in an example of hitting a curb (racing curb) or bump and one tire loses total traction, but then hitting the ground suddenly has full traction again.

That can cause issues with any differential, though Torsens are slightly more prone to break under those conditions, especially T1's, since they are quite a bit weaker. The T2 holds up a lot better, and is what Toyota currently uses. I haven't seen many (if any) T2's broken in a Toyota without ridiculous amounts of torque/drag racing, etc.

Jeff