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It's really a matter of physical limitations here...
With helical gear transmissions, stronger gears are a matter of making the gears wider.
You can get an idea of the strength of the transmission by looking at the length of the gear case itself.
Now, keep in mind that if you're looking at a 6-speed transmission, you're stuffing another set of gears for that extra gear over a 5-speed transmission.
So unless the RX-8 is using some different cut gears (dog cut gears) or exotic metals (highly doubtful), how does it's 6-speed transmission - which about the same length or slightly shorter than a 5-speed FC turbo / FD gear box - have stronger gears???
Rumor has it that the RX-8 6-speed transmission is a variant of the Miata 6-speed transmission.
Now, I can't confirm this, but it makes sense for Mazda to do this just to keep parts costs down...
So, go ahead and try and use that trans behind something putting down - at least - 300 easy pound / feet of torque at the flywheel and see how long it lasts...
Now, with that said and done...
Yes, if your shift technique is "delicate", you can minimize wear & tear of the transmission.
I do not doubt claims of extended mileage on these transmissions.
I do question why you would want to put it behind a 20B project?
Why not just stuff a non-turbo FC transmission behind a 20B if you're going to argue otherwise, since these transmissions are basically free for the taking?
There's "possible" and then there's "not recommended".
-Ted
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