That's pretty close to what I am seeing. There must be quite a bit of loss happening somewhere. I also notice going downhill when I let off the throttle, there is a noticeable drag, almost like light regen.n2mb wrote: ↑Nov 08 2018 4:27pm
There is something strange about the range I get on the Sur Ron. With the super moto wheels at 36 psi, I get about 30 mile range. With 1920 Whr, that works out to about 64 Wh / mi.
On my previous DD ebike that maxed out at 35 mph, I averaged 30 Wh / mi. Slower max, but somewhat similar average speeds.
I realize the Sur Ron weighs 110 lbs vs 60 lbs for my ebike, but it seems like a large difference. Is the controller really inefficient? The drive train? The extra rolling resistance from the fat tires vs bike tires?
Anybody ever try checking the belt tension? Maybe it's too high. It could also be iron losses in the motor (thick laminations?)
Lifting the rear wheel and measuring the power with no load would tell a lot.
Other factors are things like controller design and hall sensor timing.
Generally speaking, anything that is wasting a lot of power is going to heat up so temperature measurements or FLIR might help pinpoint any inefficiencies.