5 ms·
Very unlikely. With power you weight beyond useful (this has basically been "solved" since the day someone built a cat around a ww2 military aircraft piston eng
by usrusr 9y ago
Very unlikely. With power you weight beyond useful (this has basically been "solved" since the day someone built a cat around a ww2 military aircraft piston engine), acceleration is determined by aerodynamics (drag and downpressure), tires and the time spent shifting gears. It's pretty evident where Tesla has the advantage.
- thinkloop 9y agoShifting gears? Why does it have an advantage?
- cheeze 9y agoTeslas don't need gears since they use electric motors. So there is literally no time spent shifting gears. See https://www.quora.com/Why-don%E2%80%99t-Tesla-cars-need-a-gear-system-Why-does-a-gear-system-make-sense-only-for-combustion-engines https://www.quora.com/Why-don%E2%80%99t-Tesla-cars-need-a-ge...
- gsnedders 9y agoThe original Veyron could change gears in 8ms, and will, IIRC hit 60 in 2nd. Changing gear isn't going to be a considerable part of the time here.
- PeterisP 9y agoWikipedia https://en.wikipedia.org/wiki/Bugatti_Veyron https://en.wikipedia.org/wiki/Bugatti_Veyron states that the original Veyron gearbox could change gears in 150ms, so it is a considerable part of the time.
- wazoox 9y agoWhile the gear are shifting the engine RPM must go down then up; the 8ms figure certainly doesn't account for the complete sequence.
- glandium 9y agoThe Veyron does 70 in first gear. I don't know if its 0-60 times require a gear change or not.
- vanderZwan 9y agoTangent: please don't downvote someone asking questions, people. I for one had not considered that electric motors have no gears to shift, and wondered "surely both cars are automatic? Does Tesla have a patent on a faster automatic transmission or something?" so I appreciated someone asked.
- stevoo 9y agoThe basic idea is that it is wasting time. But this is no longer a factor as the gear change is instantaneous with Automatic GearBox. Electric cars do not have a gearbox and just have one rotor. This does place them in a disadvantage when starting though as there acceleration is affected. Formula E cars, have started using a 3 gearbox for their cars in order to have a faster start. So it is possible that the Roadster does have a gearbox.
- drcoopster 9y agoTesla tried a gearbox in the first Roadsters, and it didn't go so well.
- Tempest1981 9y agoTesla may have a better traction-control algorithm. Or the electric motors may make it easier to modulate power more rapidly/precisely (vs gas). The 2nd picture on this page is interesting: https://electronics.stackexchange.com/questions/271674/tesla-car-maximum-torque-at-0-rpm-is-this-correct https://electronics.stackexchange.com/questions/271674/tesla...
- bennyelv 9y agoI don't think you're right about this. If the 60-0 time and the 0-60 time are the same for the Chiron then it's limited by traction (assuming brakes that are strong enough to break traction at 60). Most high performance cars only shift once before 60, and with modern dual clutch transmissions it only costs a fraction of a second. The only way Tesla are going to get below 2 seconds is either with non-street legal tyres (cheating!) or some new tyres that nobody else has.
- CommentCard 9y agoTheir demo car uses Pilot Sport Cup 2 tires, which are also used on the Buggati Chiron and Koenigsegg Agera RS (which recently set two records for fastest 0-400kph-0 and fastest production car road speed). These tires are street legal. The Roadster is significantly faster than other supercars from 0-60 on the same tires, so the advantage must come from much more efficient anti-wheel slipping from the three electric motors coupled to AWD. This dramatic speed advantage is probably a result of the ability to quickly alter the power output per wheel to minimize efficiency losses from breaking traction.
- gsnedders 9y agoFWIW, all of the hypercars on the market have custom compounds, so the fact they're both called "Pilot Sport Cup 2" by Michelin doesn't really matter all too much.
- usrusr 9y agoBraking has a very different load distribution, even with a center of mass as low as in supercars. I would not put to much into that comparison. Tires are depicted as Michelin in the announcement, it would be very surprising if they keep their best exclusive to Tesla, considering the relative proximity between Bugatti and Michelin, the relative cheapness of the Tesla and Volkswagen group representing a much bigger part of the tires market than Tesla for the foreseeable future. > it only costs a fraction of a second In other words: exactly the scale of the differences we are talking about. In addition to the short interruption itself I guess that it also takes a few millis until traction control has settled after a shift.