On the motor red line question - got another reply from the Guru:
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The fact that this is an older motor with (from what I could see) an almost uncut comm is a plus actually. That Otis motor has a tad smaller comm dia. than an ADC8 and should be safe to 6000 rpms (at least in short durations.)
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That means we're theoretically good to 28 mph in 1st gear, 52 mph in second, or 77 mph in 3rd (not that the car's going to see much over 40 mph @ 48v, if that).
Practically speaking, we could just leave the car in 2nd and forget about it.
Silveredwings - how did you make that gear/speed graph for your BMW in the transmission thread? I tried figuring it out, but I couldn't get Excel to cough out the right chart format.
Edit: next on the to-do list is raid the scrap yard for a bunch of car battery cables/connectors to string together a 48v test pack. And then hook up my golf cart controller.