5 ms·

I've been told that the Tesla Model S is the first car that had a 0-60 time that matched the 60-0. I had one of the Ludicrous models as a loaner a few years ag

I've been told that the Tesla Model S is the first car that had a 0-60 time that matched the 60-0. I had one of the Ludicrous models as a loaner a few years ago, and I'd believe it. I could feel the tires hunting for grip during acceleration.

m463 6y ago
But if you look at the power-meter thing, the acceleration power is many times the regen power http://st.motortrend.ca/uploads/sites/42/2017/02/2017-Tesla-Model-S-P100D-instrument-cluster-02.jpg http://st.motortrend.ca/uploads/sites/42/2017/02/2017-Tesla-...
- linsomniac 6y ago
  Yes, that is absolutely true, regen is only capable of a fraction of the 1,000bhp the electric motors are capable of. This is why the performance Teslas have fancy-schmancy huge ass red brake calipers.
mikewarot 6y ago
I have to believe that tire grip is the limiting factor... the maximum seems to be about 2.3 g The fastest braking from 60-0 is 16 meters (53 feet), according to https://fastestlaps.com/lists/top-quickest-stoppers-60mph https://fastestlaps.com/lists/top-quickest-stoppers-60mph Using the physics calculator at https://www.calculatorsoup.com/calculators/physics/uniformly-accelerated-motion-calculator.php https://www.calculatorsoup.com/calculators/physics/uniformly... This gives a deceleration of 22.5 m/sec^2, or about 2.3 g. I'm amazed it can go above 1 g, actually.
- faeyanpiraat 6y ago
  Its not that amazing, an alternative perspective is that in nature you have animals which can climb vertical walls, which is equivalent to having a grip that can whitstand 1g?
- colejohnson66 6y ago
  Tangent: why does a car going above 2 Gs feel, for lack of a better word, not scary, but a roller coaster pulling the same feel scary (in an exciting way)?
  - jandrese 6y ago
    I've never tried it, but there are plenty of reaction videos of people doing a ludicrous start in a Tesla and the passengers showing expressions of fear and surprise. If you are the driver then being in control probably helps quite a lot. In a roller coaster you are always a passenger.
  - bluGill 6y ago
    Roller coasters are engineered to feel like they are about to fall apart. There is a reason they creek and shake: they were built to creek and shake. They put in lots of unneeded supports that are made to shake excessively, meanwhile the actually supports are hidden so you don't notice they are doing the real work.
- linsomniac 6y ago
  That 53 feet 60-0 is a Ferrari race car, which has aerodynamics that sucks it down to the ground, more than 1g of additional downforce. Often referred to as "they could drive upside down to the roof of a tunnel. Years ago in Denver when they had F1 racing, I remember a news story about preparations the city had to do for the race, which included welding down the manhole covers. Because the amount of suction these cars make would pull the manhole covers off as cars drove over them. Also, traction is more than just friction. There's a mechanical component to it, the scraping off of the rubber from the surface of the tire. Also, as far as the 53 feet goes, remember that this car was extremely light, 1400lbs. The Tesla Model S weighs almost 5Klbs for comparison.
  - m463 6y ago
    I loved the story of the Chaparral 2J with "active downforce": https://en.wikipedia.org/wiki/Chaparral_Cars#2J https://en.wikipedia.org/wiki/Chaparral_Cars#2J Two fans adapted from a military tank engine were housed at the rear, driven by a single two-stroke twin-cylinder engine. ... The skirting produced a zone within which the fans could create a vacuum producing downforce on the order of 1.25 to 1.50 G when the car was fully loaded Maybe this sort of thing will make a comeback :) https://en.wikipedia.org/wiki/Cold_gas_thruster https://en.wikipedia.org/wiki/Cold_gas_thruster
  - mikewarot 6y ago
    >That 53 feet 60-0 is a Ferrari race car, which has aerodynamics that sucks it down to the ground, more than 1g of additional downforce. That downforce drops to zero long before the car stops. >Also, as far as the 53 feet goes, remember that this car was extremely light, 1400lbs. The Tesla Model S weighs almost 5Klbs for comparison. It doesn't matter how much something weighs... the kinetic energy scales linearly with weight. The F-16 fighter can pull 9gs, and it weighs 20,300 lbs.
    - linsomniac 6y ago
      I don't know how the ground effects and wings scale, but I'm sure it's dramatically less at 60 than at 200MPH. But I'd also suspect that it is non-zero. It's also possible that this stopping distance was measured with the aerodynamics tuned for 60-0 braking, because they adjust the aerodynamics all the time. >It doesn't matter how much something weighs Stopping distance is absolutely, 100%, impacted by the weight of the car.

m463 6y ago

But if you look at the power-meter thing, the acceleration power is many times the regen power http://st.motortrend.ca/uploads/sites/42/2017/02/2017-Tesla-Model-S-P100D-instrument-cluster-02.jpg http://st.motortrend.ca/uploads/sites/42/2017/02/2017-Tesla-...

linsomniac 6y ago
Yes, that is absolutely true, regen is only capable of a fraction of the 1,000bhp the electric motors are capable of. This is why the performance Teslas have fancy-schmancy huge ass red brake calipers.

mikewarot 6y ago

I have to believe that tire grip is the limiting factor... the maximum seems to be about 2.3 g The fastest braking from 60-0 is 16 meters (53 feet), according to https://fastestlaps.com/lists/top-quickest-stoppers-60mph https://fastestlaps.com/lists/top-quickest-stoppers-60mph Using the physics calculator at https://www.calculatorsoup.com/calculators/physics/uniformly-accelerated-motion-calculator.php https://www.calculatorsoup.com/calculators/physics/uniformly... This gives a deceleration of 22.5 m/sec^2, or about 2.3 g. I'm amazed it can go above 1 g, actually.

faeyanpiraat 6y ago
Its not that amazing, an alternative perspective is that in nature you have animals which can climb vertical walls, which is equivalent to having a grip that can whitstand 1g?
colejohnson66 6y ago
Tangent: why does a car going above 2 Gs feel, for lack of a better word, not scary, but a roller coaster pulling the same feel scary (in an exciting way)?
- jandrese 6y ago
  I've never tried it, but there are plenty of reaction videos of people doing a ludicrous start in a Tesla and the passengers showing expressions of fear and surprise. If you are the driver then being in control probably helps quite a lot. In a roller coaster you are always a passenger.
- bluGill 6y ago
  Roller coasters are engineered to feel like they are about to fall apart. There is a reason they creek and shake: they were built to creek and shake. They put in lots of unneeded supports that are made to shake excessively, meanwhile the actually supports are hidden so you don't notice they are doing the real work.
linsomniac 6y ago
That 53 feet 60-0 is a Ferrari race car, which has aerodynamics that sucks it down to the ground, more than 1g of additional downforce. Often referred to as "they could drive upside down to the roof of a tunnel. Years ago in Denver when they had F1 racing, I remember a news story about preparations the city had to do for the race, which included welding down the manhole covers. Because the amount of suction these cars make would pull the manhole covers off as cars drove over them. Also, traction is more than just friction. There's a mechanical component to it, the scraping off of the rubber from the surface of the tire. Also, as far as the 53 feet goes, remember that this car was extremely light, 1400lbs. The Tesla Model S weighs almost 5Klbs for comparison.
- m463 6y ago
  I loved the story of the Chaparral 2J with "active downforce": https://en.wikipedia.org/wiki/Chaparral_Cars#2J https://en.wikipedia.org/wiki/Chaparral_Cars#2J Two fans adapted from a military tank engine were housed at the rear, driven by a single two-stroke twin-cylinder engine. ... The skirting produced a zone within which the fans could create a vacuum producing downforce on the order of 1.25 to 1.50 G when the car was fully loaded Maybe this sort of thing will make a comeback :) https://en.wikipedia.org/wiki/Cold_gas_thruster https://en.wikipedia.org/wiki/Cold_gas_thruster
- mikewarot 6y ago
  >That 53 feet 60-0 is a Ferrari race car, which has aerodynamics that sucks it down to the ground, more than 1g of additional downforce. That downforce drops to zero long before the car stops. >Also, as far as the 53 feet goes, remember that this car was extremely light, 1400lbs. The Tesla Model S weighs almost 5Klbs for comparison. It doesn't matter how much something weighs... the kinetic energy scales linearly with weight. The F-16 fighter can pull 9gs, and it weighs 20,300 lbs.
  - linsomniac 6y ago
    I don't know how the ground effects and wings scale, but I'm sure it's dramatically less at 60 than at 200MPH. But I'd also suspect that it is non-zero. It's also possible that this stopping distance was measured with the aerodynamics tuned for 60-0 braking, because they adjust the aerodynamics all the time. >It doesn't matter how much something weighs Stopping distance is absolutely, 100%, impacted by the weight of the car.