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  1. S

    Yuan Lang controller shunt idea

    Update on this. the bike is back together and amp meter with 350a shunt installed. From stop to go i’m reading 76amps. I wish i had a baseline to compare but based on feeling it definitely pulls stronger since the shunt mod. batter sag was quite significant. my packs only 24ah but they’re...
  2. S

    Yuan Lang controller shunt idea

    I checked ebike.ca. I think CA is overkill. I just want to see instant amps and temps. I’ll get a $20 100v/100a with remote shunt from Amazon. I ordered statorade off ebike.ca. Happy to get that installed. I’m moving away from my controller at this point so I’ll stop updating this thread...
  3. S

    Yuan Lang controller shunt idea

    Any brand preferences? Looking for a waterproof unit and also a temperature meter. One for controller and one for motor.
  4. S

    Yuan Lang controller shunt idea

    I put the controller into the frame and gave it a ride. Yes there is a difference. I would speculate about 20% more torque. What I noticed as well was a sag from 82v all the way down to 64v for a brief time while I was accelerating hard. I think the controller will handle this new setting but...
  5. S

    Yuan Lang controller shunt idea

    I would have preferred to trace the circuit but the issue is they’ve printed heavy while lines, boxes and component identifiers so much that I cannot follow the small lines. What I’ll do is remove the pot completely, re-attach the sense line using my wire and leave the shunt mod. If the...
  6. S

    Yuan Lang controller shunt idea

    I guess I missed this entirely. This is why I was so confused how guys are using a tiny trimpot and not smoking it! :lol:
  7. S

    Yuan Lang controller shunt idea

    Thanks. I will review those posts again. I guess I should remove the shunt mod as much as possible first before doing the pot mod. Thanks this was helpful.
  8. S

    Yuan Lang controller shunt idea

    Hi J Bjork. You are correct in your assumption. I connected one side of the potentiometer to the power side of the shunt the other side to the sense side of the shunt and the middle or wiper end to the sense line. My potentiometer is 25 ohms. If I used 1k or 10k my resistance values would have...
  9. S

    Yuan Lang controller shunt idea

    Here is a photo of the assembled controller. The three wires are 16awg and very short. About 1” each. I was able to measure resistance at the lowest point at 0.5 ohms. I suspect this is still quite high. So at this point I have no idea what will occur. In the meantime I am shopping for a new...
  10. S

    Yuan Lang controller shunt idea

    No sweat amberwolf. Real life is more important. I live in Canada, riding season is over anyway and the bike is apart due to servicing the front forks. These things came with hydraulic fluid I think. And overfilled. Planning to look at the rear shock as well, however I heard the rear are...
  11. S

    Yuan Lang controller shunt idea

    I guess I’ll just keep talking to myself :lol: I’ve been reading up on the power triangle to help me understand the maximum voltage the potentiometer will take. So far the calculation is as follows V = P/I Power is not really known yet because I need to measure the resistance of the four...
  12. S

    Yuan Lang controller shunt idea

    Question. I could only find a 25ohm 3watt potentiometer for this project. I’m not certain I understand this circuit mod completely. My question is should I be concerned that I’ve only got 3watt when 72v is passing through the two end points in the potentiometer? I think I read somewhere that...
  13. S

    Yuan Lang controller shunt idea

    Trace is cut but soldering to the tiny remaining trace wasn’t fun. I had to apply epoxy to the wire to ensure it doesn’t rip the remaining trace off. My plan is to mount the potentiometer so it’s accessible from outside the controller.
  14. S

    Yuan Lang controller shunt idea

    I decided to pull the board. Some very interesting design ideas. I think this is an example of over engineering. I found the sense line so I can solder a pot. Look at those phase segments. Beefed up traces with copper plates. 24 fets. I feel a little more confident in the trim pot mod now.
  15. S

    Yuan Lang controller shunt idea

    If it’s too much wouldn’t I be limited by the batteries capabilities. My bms states 50a. I assume if it attempts to pull more the bms will cut.
  16. S

    Yuan Lang controller shunt idea

    Thoughts?
  17. S

    Yuan Lang controller shunt idea

    Wingin it :lol: I don’t have a proper amp meter. I have a digital multimeter but 10a is max before it probably throws a fuse.
  18. S

    Yuan Lang controller shunt idea

    How does this look?
  19. S

    Yuan Lang controller shunt idea

    I spent a bit of time looking closely at the circuits. It’s impossible to correctly document it without taking it out. There are plenty of jump points that connect through the board to the other side. I don’t think I feel comfortable taking the heat spreader clamps off either and risk damaging...
  20. S

    Yuan Lang controller shunt idea

    Gotcha. I’ll trace it myself. I think there’s pretty good schematic software to make it look official and to validate. Might take me some time. Thanks for all your help, much appreciated.
  21. S

    Yuan Lang controller shunt idea

    I reached out to yuan lang inquiring if I could buy the schematics of this controller. If I get it I’ll post it here. If not I guess I could take the board out. The problem I’m concerned with is the clamp that secures the fets to the heat sink are extremely tight. It’s easy to remove but putting...
  22. S

    Yuan Lang controller shunt idea

    I think I might want to try the pot method. It’s super tedious to the controller, lots of plastic panels need to be taken off and battery box removed as well. I would prefer to get a pot, set it at maybe 10-20% max and leave it. If it smokes then I’ll get a new controller. The lines are above...
  23. S

    Yuan Lang controller shunt idea

    The hill is about 300m long and slopes to about 7 degrees. I weigh 240lbs with gear and backpack full of water, food lunch etc. the bike weighs 220lbs dry. The battery is about 40lbs. 500lbs total. The cells are lifepo4. Not sure about the quality. I’m not able to pull the pack out of the...
  24. S

    Yuan Lang controller shunt idea

    Thanks amberwolf for your input. What do you think I should do to gain a small amount of current. Here’s my setup and why I’m looking for a touch more umph. It’s a Chinese emotorbike rebranded to a local company known as the emmo dx. It appears to have a QS rear hub motor. The controller is as...
  25. S

    Yuan Lang controller shunt idea

    I think I may have found something related. Shunts are typically copper so this one may be tinned copper. I’ll use a knife and see.
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