General > General Technical Chat
Piles of Tesla owners stranded at charge stations abandons their EV's.
nctnico:
Just like cars on gasoline, there is always a bit more range left. Recently I rode along with someone in a Tesla. The car had 2% of range left at arrival and afterwards we needed to get to a near by Tesla supercharger as all the EV charging points where occopied. It all worked out well; especially since I got a free lunch out of it and left the meter running :P .
And again, there is no price tag to put on your safety. Efficient tyres have less grip so they are not better in any way. Having good grip means having friction and friction means material gets rubbed off which in turn costs energy. There is no silver bullet to get around that.
PlainName:
--- Quote --- A good tyre gives you extra margin when things go wrong to stop, especially so in poor conditions.
--- End quote ---
They should do, but only if you drive like you have shitty tyres on. Once you drive in a way that the good tyres let you, you've just moved the goalposts along a bit, but now when you are caught out it will be worse and you won't have had the practice in recovery.
Having said that, I use expensive grippy tyres on my bike because I'm a wuss, and teflon tyres on the car because I'm cheap :)
tom66:
--- Quote from: Siwastaja on January 27, 2024, 07:14:19 pm ---
--- Quote from: tom66 on January 27, 2024, 10:12:55 am ---Since I'm rarely running on electric fumes, I don't need to eek out the last few percent.
--- End quote ---
This is the second time I hear this rationalization from you (the previous one was about in context of Leaf's slightly stupid preheat mode losing 1-2% of battery capacity), but I think about it in the exact opposite way: any energy saving gives you more margin against running on "electric fumes". As long as it doesn't involve too big sacrifice on buy price or safety, even 1-2% gains on efficiency are important. At the end of the day, I have somewhere I need to go, and if I had better preheat logic adding 2% and better tires adding 3% then I would arrive at the destination with maybe SoC=20%, which I would be much more comfortable with than 15% because, like you, I hate running on electric fumes. (Actually, 15% is the lowest SoC I have ever ran to on my Leaf, so I have no idea what happens at 0%.)
--- End quote ---
I get you, but I think like all things in engineering it has a balance. I would rather have a safer vehicle with better tyres and lose a bit more efficiency and consequentially have to charge for a minute longer on a road trip, than find myself with an airbag in my face having crashed into a ditch. I had a BMW i3 as a loan car whilst my prior GTE was being fixed, and found it to be unnervingly unstable at higher speeds. It has very skinny eco tyres as standard, which might be okay in summer, but would definitely feel dubious in wet weather. The moose test isn't that impressive. Tyre size 155/70R19 vs 215/50R19.
PlainName:
--- Quote ---As long as it doesn't involve too big sacrifice on buy price or safety, even 1-2% gains on efficiency are important. At the end of the day, I have somewhere I need to go, and if I had better preheat logic adding 2% and better tires adding 3% then I would arrive at the destination with maybe SoC=20%, which I would be much more comfortable with than 15% because
--- End quote ---
I try not to get to that point (not that I have an EV but in micromanaging things). Couple of anecdotes:
1. Used to pare anything not absolutely essential to DOS (yes, that far back) from memory. Ran all sorts of tools to achieve than and maximise the memory available to programs. Continued same with Windows, but now it's to ensure performance (games, see), so non-essential backgrounders pruned religiously. No desktop gadgets, monitors, nothing that might use a little of the CPU. Eventually wound up with a new build W7, so much memory I could have a RAM disk without running out of physical RAM, and enough CPU that I have 30(!) task tray items plus three gadgets, and some furniture enhancements. The relief of not having to worry about anything except using the PC was significant. And, even now, quite a few years later, as you can see from the task tray count I am still nicely relaxed about not giving a toss for slight performance efficiency.
2. Phone, small battery. You can guess the rest - whatever might slow down battery use by even a fraction was worth killing off, and I had tools to keep it killed off. Even ran an app that would turn off WiFi if the phone was idle for 10 mins, or no connection was made for that time. Automatically turned it on again when the lock screen was unlocked, etc. Three different battery monitors let me track how it was doing. Then I got a phone with a decent batter, which the OS dealt with errant and wasteful apps, and it would last days without my needing to do anything special except use it. Again, that was such a relief.
If I had an EV, the very last thing I would want to be doing is micromanaging power saving. Just turn that temperature control down 1C to save a minuscule amount, and if 1C would do that why not 2C? Hell, just have no heating at all ! No thanks, I would want to just drive it and not get OCD about stuff I can never win at.
nctnico:
--- Quote from: PlainName on January 27, 2024, 08:32:55 pm ---
--- Quote --- A good tyre gives you extra margin when things go wrong to stop, especially so in poor conditions.
--- End quote ---
They should do, but only if you drive like you have shitty tyres on. Once you drive in a way that the good tyres let you, you've just moved the goalposts along a bit, but now when you are caught out it will be worse and you won't have had the practice in recovery.
--- End quote ---
This reasoning doesn't fly. It is not like you'll be driving twice as fast simply because there are speed limits. And there is something like common sense as well. About a year ago I found myself driving high up in the mountains in Switserland on a wet, windy mountain road while it was snowing a bit. No way I'm going to push the car to the limits in such a situation. In such situations I drive extra careful and let the locals I collect in the rear view mirror pass when possible.
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