EFZR lithium (b)
OwnerJason Jungreis
LocationSan Francisco, California US map
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Vehicle1991 Yamaha FZR 600
Motor Performance Golf Cart AC15 3-Phase AC
48V, 20 HP peak, 8 HP continuous, with regen.
Drivetrain12-tooth front sprocket, 70-tooth rear sprocket, 420 chain.
ControllerCurtis 1236
300A (but peaks up around 360A)
Batteries16 CALB/Skyenergy 100AH, 3.20 Volt, Lithium Iron Phosphate
System Voltage48 Volts
Charger CH-LF326
I have 16 6Amp chargers, one for each cell, as I have no BMS.
InstrumentationCurtis (mph, battery charge state, amps, temperature)
Top Speed65 MPH (104 KPH)
It's not intended as a highway bike, so for the city it's fine for getting through traffic reasonably quickly.
Accelerationmedium low speed; moderate 20mph-40mph; medium high speed. It pulls 350A for acceleration, so it has over 20 HP available. Feels like a pretty good 125cc.
Range40 Miles (64 Kilometers)
So far the furthest I've gone is about 30 miles and it took about 3.5 KWH net to bring it back to full charge, so with a total of over 5 KWH in the pack (and wanting to be cautious as I have no BMS) I think 30 miles should be fine. (Obviously it should be able to go further, but I don't want to risk anything -- and I don't think I'll ever need to ride more than 30 miles around the city in a day).
Watt Hours/Mile100 Wh/Mile
100 whr/mile is the average when riding reasonably -- but I find I don't often ride reasonably (I know I won't be going for maximum range, and so I can wring its neck with impunity). It can be a bit better with a really gentle throttle, and it can definitely be worse with hard riding. It has regen.
Seating Capacity2 adults -- how great is that for going out and parking just where you want in the City?
Curb Weight350 Pounds (159 Kilograms)
120 pounds of batteries, 40 pound motor, about 25 pounds of chargers, and the rest is just the light chassis. About 180 pounds on the front wheel, about 170 pounds on the rear wheel. Great handling.
TiresFront: 110/70/17
Rear: 130/70/18
Conversion Costhard to say as I took over the original project, but the CALB batteries cost about $120 a piece and the chargers $20 a piece.
This project is a re-do of a very nice bike begun by Jordan Shechter that unfortunately destroyed batteries due to a faulty BMS. In its first iteration, I went old-school with 6 (alleged) 50AH sealed lead acid batteries: that configuration had a range of 7-15 miles, depending upon usage. Version 2, with the 16 100AH lithium iron-phosphate batteries instead of the lead acid batteries (no BMS), is a huge improvement. I use it regularly around town, and so far it's been great - vastly more fun to be able to open the throttle without having to worry about using up your electricity. Good enough for two-up riding, which is important to me.

code by jerry