bobmcree wrote:i had a 408/4012 for awhile and i was very disappointed in the performance at 36-48v, but that is true of all the hub motors i have tried. The first controller they sent me was defective and was part of the problem, but even with a new controller i found the differences between the two settings to be disappointing. When I switched to 72V and higher it became a different world altogether. The 4012 screams up hills and cruises at 30+ and the 408 is about 10-15 mph. faster. At the higher voltage I almost never used the 408 tap except to show off.
the lead-in wire is very small on these motors, so all the conductors can fit in the inlet port, but the wire inside is the same 1 mm size as used in all the motors, with one difference. On the tapped wind motors the resistance of the 408 winding will be higher than on a single wind motor, because they use fewer strands of wire for that winding on the tapped motors. This results in some loss of efficiency when using the 408 setting compared with the performance of a single wind motor.
BTW the simulator data on ebikes.ca is taken from actual dyno data and i have found it to correlate quite well with my own experience for the 408,409, and 4012 motors i have used.
So if I understand you correctly, if I run a big amp controller at 72 volts, I would be able to notice more torque out of the 4012, as opposed to the 408?
As for efficiency, are we talking an decrease in distance per watt type inefficancy? My understanding is that the smaller diameter wire would be less powerfull, less fast, but More efficent.
As for the Ebikes, how close did you find the centertapped version to be to the 408 they have listed?
Does anyone make a 35 amp center tapped controller? Or will I need to modify one?
As for now, I've found a use for the switch. at top speed in 4012 mode, I can do 25 miles, in 408, I can do 13. The switch has become a speed limiter. Not worth the $30 price tag just to govern my speed, but it was worth the expeiriment. I've lost more money in failed battery mounts so far.