Final drive ratios released for US BRZ
 

So the final specs are back to 4.10 for the MT and 3.9 for the AT...

Looks like I'll MAY never have to leave 3rd on "streets of willow"!

How does that compare to current Gen?

I think the current gen was 4.1 for both AT and MT and in 2017 the MT switched to 4.3 while AT remained 4.1

They've probably gone with 4.1 so when the refresh comes they can give the car a performance boost by moving the ratio back to 4.3.

I doubt that. It is way more likely for gas mileage purposes, or something related. The previous gen got a 4.3 update with some minor power mostly due to the complaints of the torque dip and the lack of feel for torque in certain RPM ranges. It did a nice job in covering it up and giving it an improved feel. They stuck to 4.1 for the auto's - again, likely due to gas mileage. For this gen, they reduced the diff for both the MT. They no longer need to have it so high with a nice power bump and a significantly improved torque dip, so it leaves nothing more for people to complain about in that aspect.

Many folks also complained about the high RPM's at highway cruising speeds, which will be less of a problem now with these revised FD ratio's. And as I've already said a couple of times, it will also improve mpg's at highway speeds.

Personally, I loved the 4.3 and will probably miss when I get to drive a gen2 some day. But I do believe it will feel right for the updated power and much quicker acceleration.

I kind of wonder why 5th and 6th by themselves dont get modified to lower the highway RPMs? Those are usually overdrive gears in nearly every car and not so important when accelerating. These cars do make a healthy amount of torque even in FA20 form. No car is accelerating fast in 6th gear at highway speeds anyways.

My focus wasn't exactly revolved around highway cruising, but rather that it was another point and complaint from gen1 owners.

In the case of why they don't modify the 6th gear, I am have no clue how the internals of a transmission look, but I would assume that this kind of modification is far more complicated? My guess is you can't just adjust it to have a different ratio, as it will change the gear size and therefore force changes in the transmission internally and maybe even externally? All just guesses, but that is how I see it - and if it is the case, makes A LOT more sense to simply change out the final drive which is an extremely easy modification in comparison.

that's true. gear box changes = millions of dollars of warranty complaints for 2-3 years. Final ratio is so EZ on a RWD car.



Personally, I wish it had a 4.3 plus the new engine. That would be really sick in traffic. burn through gears kind of quick though. it did that already hm

less aggressive FD possibly gives them the ability to get to 60mph in 2nd gear? better 0-60 times.

My 2013 auto FD has been fine lol lol [emoji23]

Does anyone know if the GR86 differential is compatible with the first generation? so can I use my old 4.67 differential in the GR86?

And does the speedometer on the GR86 have to be adjusted, or is the speed display not inpactet by the final gear ratio, as it used to be?

Part numbers are the same so I would assume so.

The European version has cooling fins.


It would be interesting to know if there are other differences.

For those of us that likely won't at the track... What does that mean for highway rpm in 6th gear at, say, 55mph & 65mph? Considering there are five other gears to choose from, relaxed highway cruising would be nice.