I had a colleague who modified ECU code in his Subaru. Not downloaded some tuner, actually wrote the software himself.
I think he was pushing 600 HP and burning alcohol. Blew his engine.
The Solterra OP is interested in has neither head gasket nor timing belt.
Besides, it is a Toyota bZ4X by any other name. Would it smell as sweet to 400bird as Subaru?
Or at least, I think it is the 4WD version of the Toyota drivetrain, probably with Subaru trim.
Compare a number of key features between the Subaru Solterra and the Toyota bZ4X, from charging times, to cabin room, price, and speed.
www.subaru.com
Charge rate, we usually think of LiFePO4 as 1C discharge, 0.5C charge.
But at lower SoC and moderate temperatures, it supports 1.0C charge.
Expect similar for the other chemistries. Tesla pre-heats. Note manufacturer claims of fast charge are not to 100%, maybe to 80%.
Since this topic is gaining interest again, here are a few more tables showing the same trend as the Ganfeng Datasheet for other manufacturers
CALB SE series datasheet is the clearest but least detailed (and doesn't acknowledge SOC):
ETC 228 is quite similar in presentation to Ganfeng, but min of 0*C and SOC doesn't appear too important:
Here is the Ganfeng table again for comparison (the only one shows that shows...
So fast partial charge at SuperCharger stations could be fine.
0.1C at home seems ideal (if you have a low overnight rate.)
Those of us coming off net metering to Solar Billing Plan in California may want to do our charging during a morning couple hours, unless we charge a large ESS then discharge it into the EV later. Or charge on the weekends and have enough range for a week's commuting. That's only 500 cycles in a decade, something even AGM would have supported. Small battery EV and SE facing panels could be the economical approach, assuming we go to work late. Or two EVs, take alternating days. 1250 cycles to 1750 cycles in a decade.