StudEbiker wrote:I try to run 36v LiFePo4. I am a commuter rider, so not wanting to run faster than 25, but I like to get off the line fast and be able to climb walls.
That's fine. You just can go for the 8T MAC, I assume you use 12s lifepo
Right now I am pulling about 1300w tops from my pack, but I know I have some inefficiencies in my set-up that is sucking a bunch of that up.
I can sing a song about that
Also, it looks as though you are using a freewheel on both sides of the motor. Is this necessary? It seems like one on the crank side is enough since the rear wheel will have a freewheel on it. Could you not use a fixed gear on the output side of the motor?
Not necessary. Only used the freewheel on the output for testing, since I have no output gear yet. Tutorial how to make one will follow next week. HOPE that there will be no issues using the 3-screw input freewheel design, I have not tested yet. Tests will follow next week also.
I have been thinking of ways to use #219 cart chain in a mid-drive setup and it seems like using a fixed gear on the output side of the motor and one of the crossfire 10-hole freewheels on the back (I'm using Nuvinci hub) would be a good solution for using #219.
Of course this would work, but is not necessary or reasonable, since 1/x3/32 inch is more common and cheaper and will last longer than your NuVinci. If you do such a setup go for the old heavy NuVinci and exhange the oil after a few thousand kilometers. THEN you might try, but not with a NEW BOUGHT Nuvvincy, it has to wore in first (and still might fail with 3hp+). Problem is, we will get a quite good efficiency so most of the power we push in will really make it to the rear wheel
Instead do a #219 chain overdrive on the pedal side. Getting 5:1 ratio for example using 60/12 and buy a fast BPM. I have not figured out how you can get a freewheel into a #219 12T sprocket. At least you can do this using a freewheel crank
but that's something I would want to avoid.