I did a search as per listed subject and got lots of hits, over 50 but all were related to a specific bikes, so I thought I would start a new topic specific to this newest drive system from Bafang.
I am not even going to state the bike brand it is in. I hope this is where we can share our experiences on this new drive without regard to specific frames, since anyone who owns one of these probably bought a purpose built bike..
Here is the technical description from Bafang's site:
The mid-drive motor constantly samples relevant information at a frequency of up to 80k Hz via a torque sensor and two speed sensors which are all highly sensitive. The resulting data on crank torque, vehicle speed and the speed of rotation of the pedals is made available to the controller, ensuring precise control of the vehicle while achieving the highest possible efficiency. The Max Drive System puts the rider in complete control. In spite of a generous power output and a maximum torque of more than 160 N.m, the motor operates in virtual silence. The modular motor design and integrated controller make disassembly easier and improve service responsiveness. This motor can be black.
The specifications can be seen here: http://www.bafang-e.com/en/components/c ... 250cb.html
I had been riding a hardtail BBSHD for several months when I received the new Ultra 1000. Immediate difference is of course torque sensing pedal assist versus the cadence system on the BBSHD. I found it disconcerting at first! My unit came programmed for 100% throttle in all assist levels 0-5 and that is also the wat my BBSHD was programed so this was how I ran the a lot of the time the first few rides as I got more used to the new torque sensing assist system.
I am now a convert to torque pedal assist, I have stayed with the stock settings for the Torque page so far, and I find you get a good cadence going in certain gears at certain assist levels all the way up to 35mph in top gear which is 11 teeth x 44 teeth on the original Bafang front sprocket. It really does make you feel like Superman! I ordered a Race Face 42 tooth sprocket yesterday and I will report back on how that changes the drive, hopefully for the better! The nice thing is the 130 Race face bolts right on to the Bafang adapter.
Power Wise the Ultra 1000 is the same on paper as the BBSHD and at 30 amps max program setting puts out 1500 watts. However this is a new drive system, the stator has a larger diameter and is wider, the drive is heavier. My initial evaluation is it does not "catch Rs" as fast as the BBSHD. Once I install the 42 tooth to match my BBSHD, I will reevaluate and report. I don't mean to imply it has less power, just a little different, but still really powerful!
I will tell you that running a whole 20.4AH 48 volt battery thru this unit at full throttle doing average 25-30 mph on dirt roads does not get the drive unit very hot at all. It runs strong and quiet.
So far I am quite happy with this drive. If you really want to clown pedal, you can by just using the throttle and pedals.
Is the new Bafang Ultra 1000 better than the Bafang BBSHD?
Yes, if torque sensing PAS is your desire.
If not and cadence PAS is good for you then the BBSHD is a great drive and maybe most importantly does NOT require a purpose built frame and is a better choice for DIY for that reason alone.