8 ms·
Too bad it can’t maintain that performance for any extended period of time. Battery is known to overheat if you drive it too hard.
by 0xbear 9y ago
Too bad it can’t maintain that performance for any extended period of time. Battery is known to overheat if you drive it too hard.
- zippergz 9y agoI’m no Tesla defender, but how is anything “known” about a car that was first announced a couple of hours ago?
- 0xbear 9y agoIt’s physics, there’s no way around it. You expend a ton of energy——battery heats up. Without massive radiators there’s nowhere for that heat to go.
- paganel 9y agoYou get voted down by people who just want to believe stuff, physics be damned. Doesn't matter that the same exact thing happens to the existing S models which manage a more than decent 0-to-60 performance on paper (they're in the same league with the Lambos and the Ferraris), but because of those damned physics I don't think that any of them actually completed a Nurburgring lap (that's ~7 km driving the S model like a sports car).
- sooheon 9y agoReally? Are you saying 7 mins of hard driving will render it literally unable to continue?
- 0xbear 9y agohttps://insideevs.com/expected-tesla-model-s-fails-lap-nurburgring-full-power-video/ https://insideevs.com/expected-tesla-model-s-fails-lap-nurbu.... Not “unable to continue” perhaps, but unable to deliver a sports car-like performance.
- pja 9y agoThe S will go into reduced power mode after 7 minutes of track grade driving: https://jalopnik.com/heres-what-a-tesla-model-s-can-do-around-the-nurburgrin-1600644908 https://jalopnik.com/heres-what-a-tesla-model-s-can-do-aroun... It’s not a track car...what do people expect?
- u02sgb 9y agoPerhaps getting down downvoted by people who expect Tesla may have thought about this. I remember reading the overheating was due to the regenerative braking trying to push power back into the battery so it was getting hard charged and discharged constantly and you couldn't switch off the charging. The bigger battery may be so you can switch off the regenerative braking.
- ajnin 9y agoNo, it's incorrect, physics does not mandate that battery should heat up as you expend energy. Ideally all the energy would go into kinetic energy and be dissipated by friction losses due to air or contact between the road and the tires. The battery heats up only because the process of tranferring the chemical energy from the batteries to the car motion is imperfect, and there are internal losses do to the internal resistance of the battery. I'm not saying that Tesla has invented a sufficiently efficient battery, but to vaguely claim "physics" makes it impossible is wrong.
- 0xbear 9y agoIt does. It will heat up. To quote a physics textbook: “Power transfer between a voltage source and an external load is at its most efficient when the resistance of the load matches the internal resistance of the voltage source.” IOW in the configuration where the power transfer is at its most efficient, battery has to dissipate as much thermal energy as motor(s) are consuming. Too much internal resistance and most of the thermal energy ends up in the battery. Too little, and your motors aren’t going to do their best. But in either case even with the load that’s not 100% matched, you do end up with a ton of heat dissipation in the battery when a heavy car like this is driven hard.
- carry_bit 9y agoThat sentence from the textbook is poorly worded, see https://en.wikipedia.org/wiki/Maximum_power_transfer_theorem#Maximizing_power_transfer_versus_power_efficiency https://en.wikipedia.org/wiki/Maximum_power_transfer_theorem... Yes, power is lower when efficiency is greater all other things equal, but you work around that by not making all other things equal.
- Devthrowaway80 9y agoI think he's referring to the fact that Model S's are known to overheat and go into limp mode when pushed hard at the track. Not necessarily applicable to this particular vehicle.
- 0xbear 9y agoIf anything, it’s going to be even more applicable. I don’t see much in the way of air intakes. No intakes——epic fail on the track.
- deleted 9y ago[deleted]
- eliaspro 9y agoThe Porsche Mission-E will handle continuous top-speed just fine without overheating, so I figure Tesla will come up with a competitive cooling solution until 2020 as well.
- Devthrowaway80 9y agoPorsche has hundreds of millions of dollars of R&D poured into the 919 hybrid Le Mans Prototype, which I imagine will translate to the Mission E. Tesla has no such experience.
- jacobush 9y agoyet.
- Devthrowaway80 9y agoI await Tesla's foray into serious racing with bated breath. I'm sure Porsche and Audi are terrified. If they gave a shit about developing actual performance EVs, I'd expect them to be in Formula E, but they're not. BMW, Audi, Mercedes and Porsche are.
- u02sgb 9y agoPerhaps they're focusing on other things? Motorsport has always been about advertising, maybe they don't see an advantage in that at this time.
- agumonkey 9y agoYeah, it could drive more people to want to purchase Tesla cars but since they have production bottlenecks it's not the best of times to do so.
- paganel 9y agoToo bad almost no-one watches the E series, because they're boring af (and the whiny sounds are cringy). Porsche did the translation to Mission E because its parent company is called VW, i.e. a company that should have paid damages worth tens of billions of euros because its diesel engines have killed and worsened the health of tens of thousands of people all over Europe, but because VW is a German "national treasure" nothing of that really happened.
- greglindahl 9y agoIf you look at Teslas, they have a grill in the front that sends air to a radiator that's shared by the battery cooling system and the cabin air conditioning. For S and X and 3, it's not beefy enough to handle an extended period of time. Also, the engine has to radiate heat. So, you're boldly predicting that Tesla, which understands basic physics well enough that their existing cars accelerate well and don't burst into flames because of heat issues, is going to be unable to do any better cooling the battery and motors of a future car?
- varjag 9y agoMaking snap engineering conclusions about technology that had tens of thousands hours R&D poured into them is a popular genre of fiction. I just see how the thinking goes. "No way this issue that crossed my mind in the first 40 seconds I heard about the product was addressed by the bunch of hacks behind it".
- InternetOfStuff 9y agoSo, you're boldly predicting that Tesla is going to overdesign their cooling system to meet the unrealistic demand of unlimited-duration maximum power draw (in a supercar!). I'm not saying either of you are wrong. I'm saying either of you know equally little about the engineers' decisions, and are making equally unreasonable demands.
- greglindahl 9y agoNo, I'm not predicting that, boldly or not.
- tmzt 9y agoCould the make the whole rear a cooling system as you described, with radiators in aerodynamic flow. Also guessing that a 300k P4-AWDD will be announced at some point.
- tokipin 9y agoIt uses 3 motors (2 in the back) and has a 200 kWh battery pack. The reason for such a large battery is so that they can draw more total current without overheating, theoretically twice as much as the Model S P100DL which only has two motors (1 in the back). Having more motors means you are spreading out the current/heat. The 600+ mile range is mostly a side effect of this engineering approach to performance.
- ericd 9y agoGiven that the Model S 85 kw battery is 1,200 lb, how on earth will this thing corner?
- drcoopster 9y agoLike a ton of batteries.
- Danihan 9y ago0-60 in 2 seconds. Slalom time... 4 minutes at a top speed of 36mph.