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Discussion in 'Model X' started by voltaren, May 25, 2017.
True. If Elon tweets back I will ask him. It probably is though. Let's hope it gets unlocked!
Physics is physics. There is no ICE physics vs. EV physics. Weight is absolutely a factor. The advantage of an electric motor is max torque at 0 rpm. But you're still subject the same laws of physics. a = F / m.
I brought my car in to the service center because there was a pulsation when I accelerated (turned out to be a suspension induced harmonic imbalance with the drive shafts). I took a test drive with the service tech. He accessed a service program with the car and changed the power output to troubleshoot. He explained that all of the Teslas were software limited. He said he could get the same power output on the 75 as the 90 and vice versa. I expressed disbelief but he was pretty sure of himself. He brought up the Ludicrous plus mode and indicated it was all about wear and tear.
Ok, explain to me why two motors is not better than one.
You should have asked him to try it for a minute. I just asked my tech to change the wheels on the MCU to match my black wheels and he did.
Power (measured in Watts) is Voltage x Current (V x I). The accelerator is limiting the current delivered to inverter and motor in order to control power and consequently speed. A 75 has banks of 14 cells wires in series and those banks are in turn wired in parallel. To increase voltage, you wire cells in series. To increase current you wire cells in parallel (banks). 90 and 100 have 16 cells wired in series with the 100 having simply more banks. This is a simply explanation of why the 90 and 100 have the same 0-60 numbers and the 75 has lower because it outputs lower voltage. Yes, they can absolutely set the software to draw more current out of the 100 pack, at the expense of range, to provide better performance than the 90. Again W = VxI. But I suspect this is why the 90 and 100 have the same numbers. Tesla didn't go out of their way to map the accelerator differently. I would assume the accelerator is mapping the exact same current draw rate in a 75, 90 and 100.
Because they are smaller. There's a great drawing on the main model S page on Tesla.com. In that drawing select between the single motor, dual motor and the P100D. You will see that the single motor is double the size of the dual motors (roughly). And on the P, the rear motor is the same as the single motor and they added the front motor from the dual motor configuration. Essentially like "3" motors in the P. If my goal was to add traction without adding weight and loss of range, I would take a single motor and replace it with smaller front and rear motors. EXACTLY what Tesla did. The P simply sacrifices efficiency and range for bragging rights.
Before Tesla came out with the dual motor option, I thought about the feasibility of putting 4 motors, one at each wheel to provide the ultimate traction and control. Using 4 motors would allow you not only to control power to each wheel independently but would allow you to start building software that would torque steer a car around a tight corner. Putting more power to the outside front and rear wheels since they are spinning faster than the inside wheels in a turn.
You're wrong. And you're conflating multiple points. The dual motor adds another motor to the front... it does not use two smaller motors instead of one larger one. The P variant had a larger rear motor but we're not talking about the P.
If were asking favors, I'm thinking about a 320CALL expiring tomorrow. Ask Elon to drop something profound as well. But please, no anti-selling tweets.
Really? Right from the web site
It's in the text too,
Conventional all-wheel drive cars employ complex mechanical linkages to distribute power from a single engine to all four wheels. This sacrifices efficiency in favor of all weather traction. In contrast, each Model S motor is lighter, smaller and more efficient than its rear wheel drive counterpart, providing both improved range and faster acceleration.
You're right. I confused it with all the P talk. What's not mentioned is the inverter size and the red shading purporting the motors size is incorrect because the P and rear wheel drive has the inverter incorporated in the red while the dual motor does not.
Same reason why I'm accelerating more slowly after college.
Packing on more weight.
Shouldn't the title of this thread read "decrease" instead of "increase" 0-60 times? I certainly don't want my 0-60 time increased...just being nit picky.
It'd be nice if Tesla offers something like paying a $100 for each 0.1s off of the 0-60 time for up to 0.5s off the 0-60 time. This way it won't encroach too much on the performance models by decreasing times by only a half second and Tesla makes a few bucks for a sub-insane or crazy mode.
Relax, when Tesla needs a cash infusion; we will all get an option to purchase the software to reduce our 0-60 time by 0.5 seconds at a cost of $5,000.
I'm sure this will be coming eventually. I could see them putting it on the new Roadster.