Thanks for the info.
2019 P3D- so no octovalve - and that's the scenario that I mostly notice it in, as well: reversing slowly into my slightly inclined garage.
I imagine that the rear motor still comes into play in reverse?
In reverse, the rear motor really isn't doing anything normally (for AWD models). It's just in the "coast" or "active torque sleep" mode, if I may borrow a term from
@Saabstory88.
If the front wheels slip, they'll bang it off and bang on the rear motor. My driveway has this little dip that freezes often right in line with the right side wheels. Whenever it's icy, I get to experience this. The rear rolls right over it, but as soon as the front gets to it, it slips. So both CAN bus data and physical observation confirm majority (probably sole) use of the front motor when in reverse at low speeds, in my experience.
Yes. We do.
In regard to front motor torque, all the graphs I've seen point towards the front motor being only energized when under heavy acceleration or when rear wheel slippage has been detected. This makes sense, as the front motor costs nothing to leave idle, but the rear motor would need to be in active torque sleep.
Ok cool, it's almost definitely something related to the rear motor then.
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All graphs you've seen paint an incomplete picture, but that's to be expected.
Most people don't care what the car is doing at turtle speeds. Existing graphs are basically variations of flooring it with a twist: stock, chill mode, after an update, at various SoC, etc. These are more interesting graphs even if they mean little to our everyday lives, while the everyday stuff (e.g. how the motors behave at low speeds) is mundane to most.
The front motor is also used for regen at low speeds (in Drive), but only if you've started off at a lower speed (coming down to a red light, it'll use the rear motor still). So if you're navigating a parking lot or something, the rear motor propels and the front motor handles regen. I haven't got a clue why they do this, honestly.
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