You mention the pack as not being nerfed. Is the nerfing actually tied to the pack itself, or is it in the BMS state it?
It's the pack, its firmware, and the actual stats of the pack as computed by the BMS that determine supercharging speeds.
E.g. if you take a nerfed pack from one car and put it in another (with a BMS that has no memory of its usage), will it still be nerfed?
The BMS is part of the pack. So if you take a nerfed 85 and put it in a car that has a 100 or similarly not-nerfed pack, that car will now have the nerfed pack and get slower charging speeds.
FWIW, I've only seen about a 140kW peak on V3 chargers with my 100kWh battery, and yes, that was at a low SOC and springtime temps (not too hot or cold). Definitely have never seen V3 above 150kW.
To break 150kW the pack definitely need the pack to be hot and low SoC. And it won't hold it for a very long time, just like the 250kW-capable packs don't hold 250kW for long. One of the benefits of the 100 packs is that they are higher capacity and that 1C is actually 100kW... so 100kW isn't even really fast charging a 100 pack.
We've hit 187 kW on our March 2017 S100D at a v3 Supercharger. I think we've seen close to 150 kW on a v2. Those numbers were attained on long road trips in the summer, when the battery was taken down to 10% or so.
View attachment 811346
Yep, looks about right.
For completeness, to hit > 150kW, you need at least the gen2 charge port (motorized) from the P85D era onward.
Is it important for battery health to drain the battery low periodically if you don’t care much about BMS calibration? I occasionally dip below 20% but I have never gone below 10%. I will occasionally charge to 100% and drive immediately. Nominally I’m at 80%.
For the actual health of the pack? No, not really. It's for the BMS calibration. In theory if you
don't get the pack low enough for an extended period of time the BMS can become too optimistic and move your actual shutdown-at-zero point into a positive range value (so, might shutdown at 3 or 5 miles instead of 0), but Tesla has done a lot to mitigate this over the years so should be quite rare.
Nope, for health your big things are don't leave at > 90% for longer than absolutely needed, and don't leave at < 10% for longer than needed. Worst possible thing you can do to the pack is > 90% + heat (basically, Ludicrous+ usage with heating around full SoC is the absolute worst thing you can do to a pack).
Out of curiosity I'm wondering if the upgrade from S90 to 100kwh is possible without mods, if your battery has already been upgraded to a 90kwh from an original S85. Since 90 to 100 is possible without mods, are there extra vehicle constraints from original S85 Tesla's that have not been adressed for an upgrade to a 90?
RWD vehicles never shipped with 100 packs. There's no "100" ... only 100D and "P100D", both dual motor. There
is a RWD 90, so that's still standard. There's no official firmware for a RWD 100. Upgrading S85 to S90 is basically drop in + config change + firmware update. Nothing special. S85 to S100 is not so simple.