Models without LSD
 

Which models don't have the Limited Slip Differential? I see the repair manual mentions "non LSD"... so are there 3 options : Non LSD, LSD and LSD Torsen? From what I know mine is LSD Torsen because that's what's written on the marketing material, but how could I check?

All the models have a Torsen LSD!

That's what I thought.... so why do the manuals have sections dedicated to non LSD differentials?

That's a great question haha!

Isn't there some poverty spec model that's Japan only that doesn't include a LSD, or much of anything else? Maybe they just translated everything and put it in the manual, or just copy/pasted it from a different car since they're lazy.

The JDM RC versions don't have a limited slip differential. They're pretty minimalist -- unpainted bumpers/mirrors/door handles, 16" steelies, stereo/ac delete, interior trim delete, etc.

http://www.topspeed.com/cars/toyota/...-ar124444.html

Thanks for the link

That seems like a racer's dream... if it's marginally cheaper. Always chuckle when I see people on car forums (mostly elder folks) that don't want "none of that fancy bullshit."

I wish it had manual windows, but that would be a no-go without the frame. I don't know about your car, but there is no fancy shit on mine! ETA: People are slacking. Wont be long until making your Monogram look like the RC will be the cool-kid thing.

It's not "poverty spec," it's "race ready." :D

In Australia we have two versions of the 86, GT & GTS. The auto GT version currently has no LSD but I believe that the 2015 models will have it included.

Me want!

They introduced the LSD onto the GT spec in Aus on the 2014 model.
The 2013 and 2012 86 GT models had an open diff.

New Zealand spec RC doesn't have LSD either.

lol, that would be an interesting trend. Don't know if you'd want the stance kids running to that - they always find "innovative" ways to rice things up :bellyroll:

I would rather them do that..than "stance" a car :). At least one is still considered safe.

You underestimate the magnitude of stupidity.

haha did they really say that? nobody ever has opted out of a limited slip diff for the sake of weight. cost? sure. performance? rarely. weight? i dont understand it.

The 86 RC car for japan don't have LSD because it's a car for tunning it. Many want a car to tune it entirely. The RC has got nothing! No radio , lsd, ac, ... iron rims... They take to it 2 way LSD, new brakes... If only such a car could reach europa!

Sorry guys for this multi-quote, but you are all wrong. The stripped down JDM versions (RC and RA) don't have a Torsen LSD, but they do have a clutch type LSD. It might not lock aggressively, but for sure it is not an open diff. This is something it was never communicated widely from the factory, but I have a similar spec car and I checked it. Unless, if you mean that whatever is not Torsen should not be considered as an LSD, which is entirely wrong. In fact clutch type LSD's are considered more advanced, since they can lock even if one wheel is lifted on the air.

That's not what the meant at all. There are plenty that would prefer a clutch type. I'm just happy I don't have to add one right off the bat lol. The old civic tuning days sucked with most being 1 wheeler peelers lol

Are you sure you have an RC? According to this article, it doesn't have a LSD, and no mention of a clutch-type:

http://www.autoblog.com/2012/02/09/t...avor-in-japan/

And this:

http://www.topspeed.com/cars/toyota/...-ar124444.html

Would be very cool if the RC really does come with a clutch-type LSD though.

lol @ "to save weight"

It's not to save weight. It's to allow a cheaper overall cost, because a 1.5 or 2 way clutch-type LSD is going to be added by the buyer anyway.

II don'tthink you know what is going on in this very old thread you brought up.

RC/RA models were actually sold in some countries with slight changes. However, they were still stripped-down and very light. Unfortunately, with the latest revisions this is not valid anymore. The last manufacture day for this grade was MY14.

If the car has the 3.73 final drive ratio, then it also contains this clutch-type LSD. It's not a 1.5 or 2 way design, it seems to be more simple. Very few magazines got it right. In some cases it was referred as semi-LSD (a kind of marketing terminology from Lexus). As I said before, it doesn't lock as hard comparing to the racing clutch-type LSD's, but for sure it is not open-diff.

A simple check is to lift such car in both wheels, rotate one wheel and check how the other wheel rotates. In a clutch-type differential, they will rotate in the same direction.

What do you mean?

Here is a review from a magazine which mentions it almost right:

http://www.autosavant.com/2012/02/11...brz-ra-models/

"... the electronic limited slip diffrential which is replaced with a cheaper and lighter mechanically driven variant ... "

That is the first time I've ever seen anything saying the FR-S/BRZ/GT86 had an electronic diff...

Why? My 1970 Chevelle had crank windows without a frame. Had rear side windows with no frame too. The two windows sealed to one another. If they could do it then, why not now

i love me a good lsd

as did my both of my AW11's, and my '74 celica...

It means LSD together with the VDC. There is often a confusion. For example, clutch-type LSD is often referred as mechanical although Torsen is also a mechanical LSD.

Does the VDC even interact with the LSD at all? I thought it mostly interacts with braking? Pretty much everything I've ever heard about this car is that there are just 2 models..... Torsen LSD (like on the S2000, S15, etc.... pretty much every other modern sports car with an LSD from the factory) and an Open Differential on the RC stripper model. That's it... Are you saying there is another model?

That's what I'm trying to clear out. There was never a model with an open differential. The stripped down car offered a simple clutch-type differential. It is the same differential that is used in Lexus IS250 and it is usually referred as Semi-LSD. It is a simple implementation of a clutch type differential based on a spring (blue in picture):

http://i57.tinypic.com/5pinpe.jpg

Racing based clutch-type diffs use a more advanced locking mechanism.

Interesting. Have never seen that before. I assume it's just a cheaper alternative that sits in between a viscous LSD and a Torsen in terms of effectiveness?

There are two types of clutch types LSDs. The first is the one I mentioned with the preload mechanism and the other is the pressure ring based. You can see the differences here:

[ame="https://www.youtube.com/watch?v=WeLm7wHvdxQ"]Understanding Limited Slip Differential - YouTube[/ame]


[ame="https://www.youtube.com/watch?v=PEdnH7_7_yc"]Working of Limited Slip Differential - YouTube[/ame]


The pressure ring is more advanced because it gives you the option to choose between 1-way, 1.5 way or 2-way lock mechanisms and the locking force is bigger if for example we accelerate.

Overall, I wouldn't say that clutch types LSDs are in between of viscous and Torsen LSDs. Most of the racing teams use clutch type LSDs. I would say that the factory chose the Torsen LSD because of its limited maintenance cycle. Differentials are expensive to maintain and change and you cannot sell a mass production car with the clutch-based differential. An exception was made with the RC/RA models, but these count with less than 5% of the overall sales of the model.

All fr-s have lsd.

Only ones who dont are in overseas market in Asia.

I didn't mean all clutch-type LSDs, just those. It seems an odd choice considering they know most people buying the RC/RA models are going to buy a pressure ring based 1.5 or 2 way LSD. I guess they just decided to throw it in as an option instead of forcing a mandatory immediate LSD purchase like if they had included an open diff (although most buyers are going to do it anyway).

Not only Asia but other markets as well. The earlier base automatic models in some areas had no lsd (that I know for sure). Iv heard that base manual versions also didn't have a lsd