undefined | Better HN

0 pointsardit338y ago0 comments

Yes. The Chiron matches it in speed, but not acceleration. 1.9s vs 2.4s to 60mph. Since the roadster has a 250+ mph figure, the tires are probably going to be one of the limiting factors. (same with the Chiron).

" The Chiron can accelerate from 0–97 km/h (60 mph) in 2.4 seconds according to the manufacturer,[4] 0–200 km/h (120 mph) in 6.5 seconds and 0–300 km/h (190 mph) in 13.6 seconds. In a world-record-setting test, Chiron reached 400 km/h (250 mph) in 32.6 seconds, after which it needed 9.4 seconds to brake to standstill.[14]

The Chiron's top speed is electronically limited to 420 km/h (261 mph) for safety reasons.[2] The anticipated full top speed of the Bugatti Chiron is believed to be around 463 km/h (288 mph)."

0 comments

11 comments · 1 top-level

gsnedders8y ago· 10 in thread

Chiron is traction limited for most of its run; I presume to beat the Chiron's time the Tesla Roadster has better tyres for initial grip.

usrusr8y 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.

Tempest19818y ago

Tesla 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...

thinkloop8y ago

Shifting gears? Why does it have an advantage?

3 more replies

bennyelv8y ago

I 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.

2 more replies

sago8y ago

> Chiron is traction limited for most of its run

This sounds very dubious, unless it has negative aerodynamic downforce. Even then, the times for each successive mph drop off too fast for it to be traction limited. Even F1 cars are not traction limited for more than a brief spell of straight-line acceleration. Aero drag dominates very quickly.

Cornering or braking, on the other hand...

gsnedders8y ago

From memory, I remember seeing something claiming that the Chrion's 0–60 and 60–0 times were identical.

1 more reply

baq8y ago

The Veyron had little downforce when put into suicide mode, right?

sundvor8y ago

Most likely a lot more weight.

LoSboccacc8y ago

Lighter tires as rolling at 400kph+ is not a requirement and a fraction of the interiors

gsnedders8y ago

The top speed is quoted as being in excess of 400km/h? They have the same problem with speed rating of the tyres.

I'm also curious as to how much it will weigh given the batteries (given the weight of other Teslas).

1 more reply

j / k navigate · click thread line to collapse

0 comments

11 comments · 1 top-level

gsnedders8y ago· 10 in thread

Chiron is traction limited for most of its run; I presume to beat the Chiron's time the Tesla Roadster has better tyres for initial grip.

usrusr8y ago

Tempest19818y ago

Tesla 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...

thinkloop8y ago

Shifting gears? Why does it have an advantage?

3 more replies

bennyelv8y ago

I 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.

2 more replies

sago8y ago

> Chiron is traction limited for most of its run

Cornering or braking, on the other hand...

gsnedders8y ago

From memory, I remember seeing something claiming that the Chrion's 0–60 and 60–0 times were identical.

1 more reply

baq8y ago

The Veyron had little downforce when put into suicide mode, right?

sundvor8y ago

Most likely a lot more weight.

LoSboccacc8y ago

Lighter tires as rolling at 400kph+ is not a requirement and a fraction of the interiors

gsnedders8y ago

The top speed is quoted as being in excess of 400km/h? They have the same problem with speed rating of the tyres.

I'm also curious as to how much it will weigh given the batteries (given the weight of other Teslas).

1 more reply

j / k navigate · click thread line to collapse