Just curious, but how did you measure the temperature of the battery?
If you've owned your Tesla long enough you'll know the battery system goes into thermal protection mode like any other electronics system. Even a vacuum has a thermal switch to prevent overheat of the internal components. A Tesla is no different in that regard, nor is an ICE vehicle. Except an ICE vehicle has more room to breathe. In other words, the power became heavily throttled. You might argue this is no realistic case because the majority of Tesla drivers won't be driving their car on backroads twists and pulls. True, except neither would most if not all cars, yet nearly all modern cars can easily get up to 140 MPH.
The Model 3 supposedly uses a much newer cooling system and I'd like to try that out. The Model S and X supposedly share very similar cooling systems, and thus both are prone to battery overheat causing the car to throttle power delivery until the cooling system cools the battery packs to a sufficient degree to not cause the vehicle problems. Batteries overheat during charging and high drain use. Casually cruising along a highway won't cause thermal issues. Driving the way I did would, but it shows a flaw in electric cars, specific to the Model S, at this time. There's been a few videos by YouTubers claiming the opposite, except they tested in the dead of night during the end of winter when temps still linger around aught. Though I'd be curious to see if the fan system for the battery is in high gear at that point. There are easier ways to cool the system from a laymen's approach. The use of heat transfer pipes and cooled directly by passing air is rudimentary but it would work. You do bring the issue of corrosion of said heat pipes into play, though.
Then again, the Model S was never designed to be a sports sedan. I'd be interested to know if the new upcoming Roadster can avoid this issue. However, this doesn't fix the other issues Teslas been having for several years now. This also doesn't include the car not having the pizzazz it did on a fresh charge after horsing around.
At the roadsters estimated price point and the problems it may have down the line, it would be cheaper to pick up a 991 Turbo S CPO and use that. Launches to 60 in 2.5 and you can do it all day without damaging the PDK. Or simply wait for the next 992 Turbo S.
40-45*F is fairly normal for the coastline of California. It does get much colder elsewhere, but you'll be at a much higher attitude. We do have nights where it may drop down to 28* even at sea level, but they're rare. Spring begins at around 75*F and summers top out at 115* as a rare event, but usually hover around 105*. I dread to think of performance issues with a Model S then.
