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Zaphod
Galaxy President (former)
Why not? My 2011 Audi TTS only has 265hp and can do 0-60 under 5. Model 3 will be slightly heavier so don't see why 5.1 is unrealistic.
ccutrer
Active Member
Horsepower numbers don't really translate well to EVs, cause the power curve is so different.
voip-ninja
Give me some sugar baby
Your Audi likely weighs hundreds less than model 3. Germans are also notorious for under rating the engines in their cars.
According to BMW my 340i has 320 horsepower. According to dynojet testing its more like 360 horsepower.
3900 lb at 60mph has 637414J kinetic.
The motor has to add 125kJ/s.
13kW or less to overcome losses up to 60mph.
258hp is 192kW.
I don't see how it'd be unrealistic, since the low bit would be easy.
The motor has to add 125kJ/s.
13kW or less to overcome losses up to 60mph.
258hp is 192kW.
I don't see how it'd be unrealistic, since the low bit would be easy.
Another thing about EVs besides off the line torque is the ability to accelerate with a single speed gearbox.
So there are no gaps in power delivery while ICE cars would be pausing to shift gears.
So there are no gaps in power delivery while ICE cars would be pausing to shift gears.
DrivingRockies
Closed
I've always had a certain bit of pleasure when... driving comparitively... and another car takes a step back at each shift.
SageBrush
REJECT Fascism
I bolded the part I wonder about. How did you come up with 13 kW or less ? I've thought about this question of figuring out power requirements for 0-60 mph results and I always come up with "it is complicated *." While 125 kW will cover inertia, there is still air friction, rolling friction, drivetrain losses, inverter and motor losses, battery losses and probably a couple other things I'm forgetting.
*
The road friction energy losses seemed within my grasp: starting from 0.009 CRR and 0.5*a*t*t distance, the energy would be 0.009*1600 Kg * 9.8 * 0.5 * a * t *t joules
I was less sure about the energy to push air out of the way. I started from the mass of air extending from the front of the car out 0.5*a*t*5 feet away and then integrated 0.5 * m*v*v from 0 to 60 mph.
I can only guess at the remainder, but certainly 10% overhead ... maybe 20% since the motor power curve is at the edge.
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SnoopyMarkham
Member
"A seat heater and usb port (4 total) for every passenger"
2 things:
1) I thought this seats 5 people so shouldn't that be 5 usb ports
2) Does this mean 4 seat heaters as well? 2 front and 2 rear? If so, see #1 re 5 passengers. Should it be 5 seat heaters?
DrivingRockies
Closed
Maybe the driver isn't considered a passenger? I agree, bad wording if so.
Dynastar
Member
"...for every passenger (except the sucker in the middle, he has no room to use a tablet anyway)."
FloridaJohn
Member
insaneoctane
Well-Known Member
If you have 3 people crammed in the back seat you probably don't need seat heaters at all 
Dynastar
Member
If you have 3 people crammed in the back seat you probably don't need seat heaters at all
The S heats the middle seat, so I bet the middle seat of the 3 is heated too. Extra cost is almost zero. Four USB plugs, five heated seats.
SnoopyMarkham
Member
You don't see the value of a feature that uses perhaps 300-400 watts tops that can warm your frigid hands in the winter and reduce the need to crank the 6-8 kW heater in an all-electric vehicle?
It should be part of a cold package. Make it heated front and rear seats, heated side mirrors, heated windshield washer nozzles and heated steering wheel.
My Mercedes does not have a heated steering wheel and I live in Canada. Would I want one? Sure, but it's not a deal breaker. Every car I've owned has never had a heated steering wheel.
BluestarE3
Active Member
Back in the late '70s when I lived in Alaska for awhile, I was car shopping and the SAAB dealer was extolling the virtues of the Swedish marque with its front-wheel drive and heated seats. As a young man at the time, I was concerned about raising my body temperature in certain regions and the impact it may have on my future ability to be fruitful and multiply. I did not buy the SAAB (but that wasn't the sole reason).
DrivingRockies
Closed
My wife is about to have twins. Bring on the seat heaters.As a young man at the time, I was concerned about raising my body temperature in certain regions and the impact it may have on my future ability to be fruitful and multiply. I did not buy the SAAB (but that wasn't the sole reason).
Zapped
Model S - PURE EV
BluestarE3
Active Member
Guess that'll accomplish the result as the heated seats, but without the fun.
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