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Tesla Roadster

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Re: Tesla Roadster

#51
post #34

Earlier quoted context omitted.

Range is easy: just add more battery. It’s expensive, but this is an expensive car.

But space and weight are limited on a supercar. So you have to choose one.

They have a lot to work with since their competitors have to carry V10, V12 and W16 engines

Re: Tesla Roadster

#52

The convertible roof STORES IN THE TRUNK? That is just an absurdly non-luxurious design decision.

Wait you even have to physically remove it ???

Yes, like most convertible supercars/hypercars. The Pagani Huayra, all the Koenigseggs, the LaFerrari Aperta, Bugatti Veyron Grand Sport, etc.

Re: Tesla Roadster

#53

If that top speed ("Over 250 mph") is accurate wouldn't it put it in contention for "Production car speed record" per: https://en.wikipedia.org/wiki/Production_car_speed_record Additionally I hope nobody ever tries to "red line" it on a public road for their own and everyone else's safety. 4.2 sec 0-100 and a 250+ mph max is a very temping but potentially deadly combination. Does anyone who owns a Tesla know if you c…

> Does anyone who owns a Tesla know if you can configure it to reduce the acceleration or artificially limit the top speed (e.g. "teenager mode" in other cars)?

Yes it has both options however they're profile settings that can be changed by the operator. There's not parental profile or anything like that.

There's a valet mode which just nerfs the car all around but that's independent from the speedlimit and acceleration characteristics settings.

Re: Tesla Roadster

#54
post #10

What's the mile range at 250mph? Also, that picture look cartoon-ish... I wonder if it was modified in any way?

Since the car produces 10.000Nm, I estimate the peak output power is around 1500kW. So at full power it could drain the 200kWh battery in about 8 minutes. In 8 minutes you will have covered ~33 miles @ 250mph.

Of course there are many other factors at play here.

For comparison: a Bugatti Chiron/Veyron is known to empty its 100L fuel tank in about 12 minutes at full power.

Re: Tesla Roadster

#55
post #34

Earlier quoted context omitted.

Range is easy: just add more battery. It’s expensive, but this is an expensive car.

But space and weight are limited on a supercar. So you have to choose one.

Not if you’re battery-limited in performance. An ideal performance electric car is all battery and motor with the weight of everything else reduced as much as possible. That naturally means your battery will be way over-sized compared to a typical electric car.

Electric batteries are power-limited as well as energy-limited. So if you want more power, you need a bigger battery. (Alternate chemistries are also possible, but even then you reach a practical limit.)

The naive approach is to think of a battery like a gasoline tank, whose size and capacity you want to minimize if you’re going for performance records. But really it’s part of of the powertrain, and having a larger battery brings a bunch of other benefits like longer lifetime (in miles driven), charge & discharge speed (in kilowatts), higher thermal mass (can handle those big spurts of power that might temporarily exceed the cooling system’s capacity), and higher electrical efficiency at a given discharge speed (a larger battery at a given voltage has lower internal resistance, thus less resistive losses and less heat generation).

Re: Tesla Roadster

#56

I call bullshit on this. 1000km range and 400km/h top speed? Obviously you can't have both but each of this is unrealistic enough on its own. You can't even go 400km/h on the Autobahn, which roads are they building this for? And fully loaded SUVs like the Hyundai Kona get somewhat about 500km in normal crusing mode. 1000km is either a breakthrough in battery technology or measured/calculated when going 50km/h at best…

400 km/s is possible on the Autobahn ... but it is an exception. 1000km range at 100km/h maybe :D

> 400 km/s is possible on the Autobahn ... but it is an exception.

Voyager 1 hardly achieves 16.49 km/s. It seems strange that German engineering can achieve better from tarmac & ICE.

/snark

Re: Tesla Roadster

#58

If that top speed ("Over 250 mph") is accurate wouldn't it put it in contention for "Production car speed record" per: https://en.wikipedia.org/wiki/Production_car_speed_record Additionally I hope nobody ever tries to "red line" it on a public road for their own and everyone else's safety. 4.2 sec 0-100 and a 250+ mph max is a very temping but potentially deadly combination. Does anyone who owns a Tesla know if you c…

> Does anyone who owns a Tesla know if you can configure it to reduce the acceleration or artificially limit the top speed (e.g. "teenager mode" in other cars)?

In my Model 3, dual motor, I can do both: Limit acceleration and limit the top speed.

Re: Tesla Roadster

#59

620 Miles range?! that's huge! for an all electric car, and beats even a lot of gas-powered cars

You only get 620 miles if you drive it like a Yugo. ;)

Otherwise, if you do lots of hard starts and stops, you'll probably get about 400ish.

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