WoodlandHills wrote:Seriously, you should check your facts first: the i3 is not under geared for the weight. It's BMWs fastest acellerating car from 0 to 40 mph (faster than ALL the M-cars), it simply runs out of steam about 65 or so. How many miles have you driven an i3? I have about 15k so far and I suspect that I might have a better idea of what that particular vehicle feels like than you do. Would I be correct in thinking that you just read something somewhere as opposed to having actual experience in what you are posting about?
3000lbs plus driver and passengers pushed by 170hp geared for 93mph with a 7+ second 0-60mph time is what I found with a quick search, an ice wagon AFAIC due to weight and gearing. Add field weakening to the equation and it's no wonder it's done at 65. You're the one who said it needed a 2 speed, which would hurt not help. If you added more motor with the extra weight of the tranny you want it would come out ahead. In all likelihood they've got the motor bridled back conservatively, since they don't want to embarrass their own gassers, so what you really need is a controller/computer hack and maybe a bit more voltage too.
Perhaps you should actually read posts before commenting
Its a short post, could you point me to where I led you to believe I am claiming that my ebike goes 60mph? I certainly mentioned "60 mph" and "ebike" in the same sentence, but there were also some other "words" as well that you may not have understood or have been unclear about. Sometimes these "words" can change the meaning of "sentences" or even whole "paragraphs", thus it often helps to read the complete post and then take the time to "understand" it before commenting. I hope this suggestion helps to avoid further embarrassment in future comments
You're the one who said "Until you get up over 15hp or so a gearbox is essential for an off-road ebike given that one would want a speed range of 0 to around 60 mph or so with weight well under that of the lightest ICE MXers." Why does a fixed gear ratio drive need to exceed what you have now if it's the same weight, more reliable, more efficient, etc.
Could you post a link to a quieter mid-drive motor than the BBSHD? It should be easy for you to find since you are so certain that they exist. Thanks in advance
Any motor can be rigged up as a mid-drive motor. Multiple stages of reduction always add noise and cost efficiency. Higher rpm comes with more noise too, both in terms of the motor and the front sprocket or pulley. I'm not into 1-2kw drives and don't know all your requirements, but that's enough to get you started, since investing all that weight in motor instead of a bunch of gears and multiple planetary gearsets is the route to spinning the motor slow enough for near silence.