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  1. rui_fujino

    Ebike Project 72V HS3540 UK "build thread" +Videos!

    Here are the updates! I"ve cleaned up the bike and drop out. And YES, the problem was with hall sensor. I"ve replaced all three just in case, I'm surprised with how clean the inside of the motor was despite all the riding and harsh conditions in the last three years! Here are the photos...
  2. rui_fujino

    Ebike Project 72V HS3540 UK "build thread" +Videos!

    Okay, Its been a while since my last update. I run into trouble last week...My ebike has finally given up on me on way to work... I was going about 30mph when light changed in front of me so I let the throttle go and regen kicked in, I hear grinding noise just like when sensor wires aren't...
  3. rui_fujino

    Ebike Project 72V HS3540 UK "build thread" +Videos!

    Sorry I didnt get back to you sooner. I had trouble logging in the other day and I've completely forgot about this :( Now, as for the Troque arm, I dont think its very strong setup (unless you are planning to use it for less than 1kw setup.) bottom bracket is something I've looked for a while...
  4. rui_fujino

    Ebike Project 72V HS3540 UK "build thread" +Videos!

    After over 3000miles, still holding solid! Only thing I've done is to paint it with anti-rust paint so I try winto rust away. Just make sure you heat it while letting them harden.
  5. rui_fujino

    Ebike Project 72V HS3540 UK "build thread" +Videos!

    before you decide I'll tell u something from my experience. my first E-bike did have battery pack on the rear rack. it was so out of balance and I never got satisfied with how it looked. plus you will never find perfect stand so it will fall once in a while. if lipo is not protected very well...
  6. rui_fujino

    Ebike Project 72V HS3540 UK "build thread" +Videos!

    They balancer works okay What I do when I charge my pack is: 1, I plug them in the bulk charger and start charging. 2, I check the battery medic and see if any of the cells are out of balance. 3, If not, i'll leave it on there(without using balancing function) so that I know how much its...
  7. rui_fujino

    Ebike Project 72V HS3540 UK "build thread" +Videos!

    20s2p (83.5v 10ah Lipo),HS3540 sensored (MethTek), 12FET lyen @ 50A Top speed 45mph(72.4km/h) 32kg. I've got most of how i set up the battery packs on fisrt couple pages of this thread so check that out.
  8. rui_fujino

    Ebike Project 72V HS3540 UK "build thread" +Videos!

    thanks! I've started sort of new life in Japan away from UK now so dont have time to update... BUT! I"ve bought back my bike with me and is already assembled back! so will do some updates in next couple weeks! :mrgreen:
  9. rui_fujino

    GCinDC's Giant DH Comp

    yea! that totally happens to me too! I've always wondered if there are any ways to solve it other then to go slower....
  10. rui_fujino

    Ebike Project 72V HS3540 UK "build thread" +Videos!

    I'm leaving UK very soon and I'll continue to make some videos and the updates but for now... I am selling my bms chargers so check it out if you live in UK!
  11. rui_fujino

    BMS Battery Alloy Shell Charger Problems

    Hi, I've got some c4140 transistors for 600w charger replacement. Questions is, can I use them for 400w charger too? The 400w ones are 4139.
  12. rui_fujino

    First build - show me the way of the e-bike!

    I think for you. the best thing to do is to buy kit with 48v 1000w motor, 25A controller and 10/15Ah Lifepo4. most of the ebay kit with battery are this type. this is good example...
  13. rui_fujino

    First build - show me the way of the e-bike!

    First of all, Welcome to the forum! I hope you get all the help you need here! now few answers; 1, you can get a bike or the motor. all the dropout space are around 135mm and it's pretty standard. 2, for lead acid you wont need balancer, for laptop batteries you can build your tabs and make your...
  14. rui_fujino

    Your Favorite Ebike Tire

    +1 I like it too!
  15. rui_fujino

    Rear axle dropout... Forgot torque arms

    Sorry to change the subject but what freewheel / rear gear do you have there?? it doesn't look like normal freewheel?!
  16. rui_fujino

    GCinDC's Giant DH Comp

    Easiest way I know is to use heatgun/hair dryer. that’s how Fox mechanics removes old decal to new ones when they service customers fork. I hope this works on yours too
  17. rui_fujino

    An interesting designer portfolio case example of e-bike

    No, That bike has no motor, controller, battery, brake/gear cables, brake levers, suspension and derailleur. I may have missed more :P
  18. rui_fujino

    An interesting designer portfolio case example of e-bike

    pretty cool stuff. Few things I've noticed. they haven't got anywhere near finish...they need to make the bike functionable before they start converting it to electric. At their stage, no brake, no gears, no lights and no suspensions. With extra weights on the bike with battery, motor...
  19. rui_fujino

    Definitive Tests on the Heating and Cooling of Hub Motors

    I know some people must have thought about this but has anyone attempted to make a use of peltier? I think instead of trying to use ambient temperature to cool hub motor, we should be using something which is cold to cool hub motor. since the hub is designed to spin, we can use the peltier to...
  20. rui_fujino

    BMS Battery Alloy Shell Charger Problems

    Take a pic of inside and we can help! :wink:
  21. rui_fujino

    Ebike Project 72V HS3540 UK "build thread" +Videos!

    something very annoying happened today... my bulk charger died again (3rd time). this time, cheap chinese resistor decided to blow up 5min into charging... Having BMSBattery charger gives me a good reason to balance charge individually every now and then :wink: I'll replace it and see if I...
  22. rui_fujino

    Ebike Project 72V HS3540 UK "build thread" +Videos!

    oh! I forgot to upload the final build pictures! here you go!
  23. rui_fujino

    Ebike Project 72V HS3540 UK "build thread" +Videos!

    Here is a Looong waited new ebike video! this is completely finished build of my 5th ebike! since the frame is lighter my acceleration feels so much better! lOHYh_L_98Y
  24. rui_fujino

    Your Creation's Before & After Pics

    My 5th Build!
  25. rui_fujino

    Ebike Project 72V HS3540 UK "build thread" +Videos!

    Okay so here are updates to all the build steps so far! enjoy! I had to cut the edge off the side for derailleur clearance but my blade snapped...Very strong torque plate :!: I got 122.5mm internal shimano BB which works perfect! leaves 4mm clearance from the drop-out The white...
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