Remember that you still have 4000 lbs of mass to stop so even with regen when you need to stop you will need pretty substantial brakes.
You can install our site as a web app on your iOS device by utilizing the Add to Home Screen feature in Safari. Please see this thread for more details on this.
Note: This feature may not be available in some browsers.
Sure but with the Roadster, max regen is say 40 kW. If it weights 2700 lbs and is going 60 mph, that's about 440 kJ of energy to shed. So 60 to 0 mph on regen alone would take about 11 seconds.I would think even in a fast stop it would be a good deal less than 100%. As soon as you're off the A pedal regen kicks in and it's there until the vehicle stops moving.
...(Anyone know the tested stopping time or distance of the Roadster?)...
Firmware upgrades (... doing OTA upgrades has very, very serious security implications)...
Protocols can be cracked. Anything subject to over the air updates is vulnerable. A malicious hacker could try to screw up your car by uploading an new OS or at the very least execute a denial of service attack causing whatever havoc with the system. That said, I believe OnStar has the ability to do things like remotely start cars and such, or so movies have lead me to believe , so I'm guessing this has been a solved problem. The question is, is there a government standard for it? I know for medical devices there are standards you have to meet to prove your device can't be tampered with by frequency bursts screwing with the electronics.Please elaborate on the security implications, I'd like to understand them. If you have any references, links would be appreciated.
I know for medical devices there are standards you have to meet to prove your device can't be tampered with by frequency bursts screwing with the electronics.
Please elaborate on the security implications, I'd like to understand them. If you have any references, links would be appreciated.
That said, I believe OnStar has the ability to do things like remotely start cars and such, or so movies have lead me to believe , so I'm guessing this has been a solved problem.
So, OTA communication/upgrades will be as secure as your cell phone call / data connection.
Yea, I was worried about that. Having worked in medical and security software, people vastly underestimate how secure software is. I'd really rather have the OS have no OTA ability and require all updates to be a visit to the dealer.
Well, if the dealer is located hundreds of miles beyond your car's range, you might have a different opinion.
That's the case with any recall/fix issue on a car. If Tesla doesn't have repair option in all major cities, then I won't be getting one. Anyone living in the boonies has issues with car repair in general and this one more thing isn't a big deal. You certainly don't want your car updated all the time OTA. History with other regularly updated devices shows that's a bad plan (various PS3, iphone, etc, broken by updates).
OnStar's a joke. My friend Stefan Savage, a professor at UCSD, broke it a while ago and showed how he could do roughly anything to any car he wanted.
http://www.autosec.org/pubs/cars-oakland2010.pdf