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  1. CUDAcores89

    How to charge a 72v battery?

    Question says it all, how do I charge a 72v battery I am building? I am planning to build a 72v battery out of some samsung 20Q cells from power tool batteries that I got a really nice deal on locally, Only $1 per cell. Only issue now is how to charge it? Currently I run a 52v battery with no...
  2. CUDAcores89

    Lines erased E-Bike / E-Scooter / E Motorcycle

    For me it depends on where i'm riding. If I'm riding downtown or in the city where there are lot's of cars, people, and other bikers, I would say probably around 20mph would be my maximum safest speed. Cars don't expect you to move really fast, even if my ebike looks nothing like a regular...
  3. CUDAcores89

    Looking for 48-72v brushless controller with many features

    Hey folks, I need help finding a new controller as my old one died. Well what really happened is my Greentime 48-84v brushless controller makes a bunch of horrible vibrating noise on my hub motor now. So I believe that one of the phases is dead. I have a cheap $10 36-48v sensorless controller I...
  4. CUDAcores89

    Hub motor makes squealing noise at about 15mph

    bump
  5. CUDAcores89

    Hub motor makes squealing noise at about 15mph

    well I suppose the good news is I no longer rely on my bike for transportation anymore. I'm going to a different college and will be living in the dorm rooms so I can just walk everywhere on campus. This bike has now kind of just turned into a joyriding vehicle so stuff can break without me...
  6. CUDAcores89

    Looking for rear Hub motor for hitting 40mph on flats

    You probably live in an area where you can choose to do that. I live in Michigan, where everything here is cars, cars, cars and more cars (which is why my riding is nearly flat roads). As such there are few to no bike lanes here, so I have to at least make an attempt to keep up with traffic...
  7. CUDAcores89

    Looking for rear Hub motor for hitting 40mph on flats

    Motor is a 9C clone 9x6, 6 turn hub motor with 28mm stator and 0.5mm lams. Been running the motor at 52v 30A all day no problems as measured by my turnigy watt meter. I have two battery packs ready go to. One is a 52v 16AH 14S8P battery made from Samsung 20R 18650 cells and the second one is a...
  8. CUDAcores89

    Looking for rear Hub motor for hitting 40mph on flats

    Yeah that's exactley what I do, I take the entire lane when i'm riding. Yet they just make their way into the left lane and wizz right past me. Would love to know how to solve asshole drivers. What should I do with all my parts then like the 72v controller coming in and the FF? Install it or...
  9. CUDAcores89

    Looking for rear Hub motor for hitting 40mph on flats

    Okay so about the moped dude, leave him to himself. Makes sense, don't get involved with jerks. BUT, there actually IS a very practical reason for me to go 40mph at least for 2-3 miles every day on my commute. I rode this bike 32 miles a day round trip to and from my university. That's why...
  10. CUDAcores89

    Looking for rear Hub motor for hitting 40mph on flats

    First, let me add why I wanted to do this: I am currently trying to beat a guy in my area on a moped, who a few weeks ago absolutely smoked me. If I DO go to 3000w, it will only be for a few miles to beat him in the race, and this will probably occur on mostly flat ground. Most of the time, I...
  11. CUDAcores89

    Thermal paste on hub motor windings. Dumb idea or dumb idea?

    In total, here is what i'm gonna do to this hub motor to try to eke 3kw out of it for my riding style: 1. Ferrofluid. Should be a given. 2. I cut up some 20x20x40mm (LxWxH) heatsinks and I plan to thermally glue these to the hub motor. 3 (this is the big one). I'm going to strap a 12v server...
  12. CUDAcores89

    Looking for rear Hub motor for hitting 40mph on flats

    Since I currently ride a cheap ebay hub motor, I am currently shopping for a bigger hub motor that can get me to 40mph. I currently weigh 150 pounds and my bike usually comes in at 50 pounds. My riding style is mostly flat road with occasional small hills between 0-1% grade. I currently run...
  13. CUDAcores89

    Thermal paste on hub motor windings. Dumb idea or dumb idea?

    I had this idea today about how to cool my hub motor, but it sounds pretty stupid and I see several drawbacks, but I wanted to know what endless sphere thought. I currently run a 9x6 generic ebay hub motor at 1500w continuously and i'm trying to see if I can run this thing at 3000w. Nearly all...
  14. CUDAcores89

    front or rear wheel drive?

    Decided to add to this, But I will just say rear wheel drive all the way for high power systems. My first ever ebike was a 1000w front wheel kit and that thing had like no traction. Later I installed a tiny little 250w geared hub motor on the rear and the bike had WAAAY better traction. Maybe...
  15. CUDAcores89

    looking for a 72v BMS that isn't crap, or maybe do something else?.

    So in my journey now to take a "500w" ebay hub motor and run 3000w through it (motor did 1500w just fine with everything stock), I have decided I will need to upgrade my battery pack to 72v. The battery pack will be a 20S 8P 18650 battery pack made from tested power tool cells. On the hub...
  16. CUDAcores89

    What kind of hub motor is this?

    Thanks for the help everyone, a 10ml syringe of ferrofluid is currently on order from lunacycle as we speak. My riding style is nearly all flat road. I basically never encounter hills here. I think the highest grade hill within a 50 mile radius is 1% where I live. I met this dude who had a...
  17. CUDAcores89

    What kind of hub motor is this?

    Today I decided to open up my "500w" ebay hub motor to coat the stator in some SPRAYON EL601 to waterproof it. I live in Michigan, so water getting into the motor is a real concern. But while we are in here, I would like some feedback about what kind of motor this actually is. Is this a 9C...
  18. CUDAcores89

    Enabling regen on 48v 38A ebay controller

    Hey folks. I recently bought a 48v "800w" brushless controller from ebay and I am trying to figure out how to enable regenertive breaking on this controller. I scoured the forums here but I couldn't find any information on how to do it for my particular controller. Bike specs: 48v 1000w ebay...
  19. CUDAcores89

    Upgrading to disc brakes. Buy disc brake compatible wheel, or entire bike to pull wheel from?

    Hey folks, i've just have a question regarding an upgrade I want to do to my electric bike. Background: I ride 16 miles to and from my university 5 days a week through rain, snow, puddles, you name it. Ever since getting into the e biking world, I love riding my bike every chance I get. I...
  20. CUDAcores89

    The poor mans cycle satiator

    Not sure if anyone has done something like this, but I thought I would share how I charge up my ebike battery at work quickly and cheaply without spending $100+ on a fast charger that still has lots of features found on super expensive chargers like the cycle satiator. Edit: Obviously this has...
  21. CUDAcores89

    How did you guys get into Electrifying bikes/scooter/ect

    For me it started in 2012 when I wanted a fun toy to use over the weekend. Nothing actually came of it because I just didn't know enough about batteries and motors yet, but I did do some research. I'm been much more electrically inclined throughout my life, so I know I didn't want to go the gas...
  22. CUDAcores89

    Your Creation's Before & After Pics

    here's mine: Before: After: Specs: Motor: 36v "500w" rear wheel hub motor, one of those ebay kits. Works great for flat roads and commuting, which is primarily what this bike will be used for. I am running the controller with a 14S 20AH A123 systems battery for the extra volts without the...
  23. CUDAcores89

    Found some A123 AMP20M1HD-A cells at a scrapyard today. How to take care of them?

    Thanks for the help. I was thinking for compression, couldn't I just use some pieces of 1x6 pressure treated lumber cut to the right size in combination with hose clamps? Seems like a pretty cheap and easy way to do it considering commercial packs use steel ribbon cables running around the...
  24. CUDAcores89

    Found some A123 AMP20M1HD-A cells at a scrapyard today. How to take care of them?

    Hey folks, i'm building a new electric bike to use to commute to and from where I work every day. I need to build a new battery for the ebike of course, since my old one was sold off to the new owner (after I installed a proper BMS of course, too many idiots out there). The best place I know...
  25. CUDAcores89

    Looking for "new" used bike for electric conversion

    That's kind of the reason I like going used. Since cars are how people get around here, plenty of folks buy quality-branded bikes (trek, Giant, specialized) bikes and ride them for a summer, them put the bike away never to be used again. My last bike was from 1996 and aside from some dirt...
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