Submitted by whlin76 on Thu, 2010-12-30 10:52
I was reading several Threads that discuss driving range of Roadster and can't help but notice that its effective range decreases dramatically at higher speeds due to several factors like wind, tire, drive train loss etc. which is contrary to ICE vehicles where the MPG is the best at highway speeds around 60mph or so. I've also read some discussions where having multi-gear transmission is rather pointless for Electric Cars because it defeats the purpose of having instant torque at any speeds. Not to mention, it is difficult to build a robust and reliable transmission to handle its power output (case in point the original Roadster's 2-speed tranny). My point is, you don't need 100% torque when you are cruising on the freeway thus seems very wasteful use of precious wattage. Is there anyway to reduce the torque output at the electric motor similar to cylinder deactivation system that are used in modern ICE cars to maximize highway driving range? This way the driver can switch between "Econo" and "Sport" model to suit his or her driving needs. Or something more dynamic and sophisticated system that automatically varies the torque by "learning" the driver's behaviors based on steering inputs, acceleration, etc. I think this would be a great feature on Model S since it's designed to be more practical than Roadster.