a six speed. I for one like the idea of it because the point of gears is to keep maximum power but the roadster has it at all times.
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Zoom said:I would have to drive the car in both gears to decide if it's well matched or if it needs more gears (please feel free to call me when the car is ready for testing ;D). I would think that a 6 or so geared transmission coupled to an electric motor with nearly flat torque throughout it's RPM range would add significant complexity, moving parts, weight, and would be a waste of money. After all, the transmission is necessary for two things: One, to get you rolling from a dead stop without stalling the engine (the clutch) and two, to keep the motor in it's optimal torque range so that you can get the power to the wheels efficiently. Granted, gearing is also a torque multiplier, but gears simply for the sake of shifting is a bad idea. What we really need is an infinitely variable transmission controlled by a computer, and add driver selected choices like maximum economy, performance, maximum range, or something like that. Of course, no shifting required may not fit with the image of a sports car.
Zoom said:I would have to drive the car in both gears to decide if it's well matched or if it needs more gears (please feel free to call me when the car is ready for testing ;D). I would think that a 6 or so geared transmission coupled to an electric motor with nearly flat torque throughout it's RPM range would add significant complexity, moving parts, weight, and would be a waste of money. After all, the transmission is necessary for two things: One, to get you rolling from a dead stop without stalling the engine (the clutch) and two, to keep the motor in it's optimal torque range so that you can get the power to the wheels efficiently. Granted, gearing is also a torque multiplier, but gears simply for the sake of shifting is a bad idea. What we really need is an infinitely variable transmission controlled by a computer, and add driver selected choices like maximum economy, performance, maximum range, or something like that. Of course, no shifting required may not fit with the image of a sports car.
a six speed. I for one like the idea of it because the point of gears is to keep maximum power but the roadster has it at all times.
Although the torque may be very flat, through a large rpm range, I wonder whether the energy usage would be the same regardless of the rpm that the electric motor is operating at.