Skyactiv Drive, Turbo vs Non Turbo Torque Converter 

All fluids break down over time. Personally, I'll be changing mine at 30k. 50k is a fine interval for most people, and I would only use the Mazda FZ.

It usually stays locked to some extent, I've never observed it fully unlocking during a shift either up or down. I'm working on another few videos, and one of them involves a more in-depth observation of TCC function.

@@21mazda3turbo3 interesting. Thanks for the response, looking forward to the next videos!

This type of damage is usually caused by a few things. The first is a hydraulic leak, this transmission has air checked perfectly throughout the transmission and valve body so not a hydraulic leak. The only damage is to the 3-5-R clutch set. There are quite a few transmission family's that operate with this sort of clutch arrangement and failure in this instance indicates it was a type of abuse. When a vehicle is in elevated idle such as cold start and the rpms are still above 1000 or so the person just puts it in reverse and goes before the idle drops. The 3-5-R clutch is a brake instead of a driving clutch and it puts a bunch of very quick sharp stress on the clutch set. This is my assumption of what happened to this one based on every other clutch set to be working correctly and no mechanical damage found.

There are a few things you can mathematically calculate out based on clutch sizes, pressures, etc. Some things it's too difficult to figure out based on metal fatigue strength without being part of the development team behind the transmission. We won't know the limits of the transmission until some serious power starts getting made with the engines and then we'll find the weak links. Nothing inside the transmission is looks "cheaped" out on and we see them go a long time before a rebuild is needed. The pinion gears inside the planets are a good size and larger than comparable transmissions like a Toyota U660, Ford 6F55/GM 6T70 and has larger internals than some RWD transmissions behind more powerful engines.

@@21mazda3turbo3 would you say if going the performance route cooling needs to be upgraded in these transmissions

For longevity sake adding a separate cooler will help, they do run a bit warm. I've got a few designs I'm working on for it.

I've seen some early failures but have seen many more with 150k plus miles.

@@21mazda3turbo3 That's good to hear, here's to hoping my 2023 3 base model lasts as long as my old hand-me-down 1998 Mazda 626 did! 210K miles when I gave it away and it lives on with someone else now. Heck of an upgrade let me tell you. Your AT learning re-set did the trick after it learned some bad behaviors during break in. Feels great now, still drags the 1-2 a little in 'manual' even in 'sport' but hey it's not a sports car.

@@21mazda3turbo3so its looks like well designed and well build transission. Seems better as dual clutch constructions i think… I mean from reliability POV