My speedo is completely wrong unfortunately. I'd guess it's capable of 20+mph as it's definitely going significantly faster than the 17mph cutoff it had before. Hot off the charger maybe 22mph. The Vulcan is such a stable and safe ride it's hard to judge speed so it makes me grateful of hydraulic brakes when it get it wrong haha. I'll try to get a bike computer or something to test and calibrate it properlyWhat top speed are you getting on the flat? Be interested in how the suntour (bafang apparently) is wound as I know its very torquey and great on the hills, but wondered on top speed now it's been unrestricted
It's been a blast! I have since upgraded to a 48v battery and KT 20a controller, this makes the thing fly, unfortunately it stopped working, think the controller was just a dud though. The motor wire was looking worse for wear so I bought a new one along with a cheapie controller from Amazon while I wait for my KT 20a. It's running great with this tempory setup, hoping the controller was just a dud as the KT 20a is fantastic when it works, so much torque. It has light outputs so I also have front & rear light plus horn wired in, I also added a cutoff brake as the motor can try to keep moving when you stop sometimes. I would definitely consider going 48v, the original setup I did here works just fine though, depends just how far you want to take it.Hi, this is exactly what I want to do to my Crossfire E. You completed your project about 8 months ago, can you give an update on how it’s run since then and would you do anything different. Thank you.
Would it tell you if it was thermal cutout? I ran mine naked on the frame and the outer shell stayed pretty cool. Sometimes when it cut it would say error 6 which is a short, either it was a dud or my motor cable was. China ems seems to be giving my replacement a grand tour of China, tracking is all over the place lolThe 6 fet s/w KT's do suffer from getting HOT, my one and I know AK had a similar issue with thermal cut out's. Long term heat etc must have an effect on the component parts, esp on longer ride out's involving quite a bit of climbing.
I did add an extra heatsink and a pair of 5v fans run off a pair of 18650's in P, now on my 700c Boardman have upgraded to the slightly larger 9 fet S/W KT.
Ok thanks for that, I'll see if the new one behaves06 is phase short/error which if not a wire issue is a fet issue.
Fets act as a switch an can latch on and off, when they get hot the circuit is closed causing a temporary short, once cooled down enough the circuit opens again.
I in your case maybe a fet simply failed so you still got error 6, you can test for failed fet by simply probing between the red wire to each phase and black to each phase.
All readings should be the same and in the range of 7 - 14 or 15 ohms.
Happy to report replacement is working a treat, the fun never ends for me though, my throttle snapped on the way home and a puncture patch failed as I was fitting the new controller lol. It's so much more powerful than the brainpower one I was using and it's nice to have my integrated lighting backIf a controller fails usually the two most common reasons are wrong polarity or fet failure. Fets work like a switch and need low voltage to open the circuit to allow power to flow, when one fails voltage fails to flow & like a switch it remains off/closed producing the short. Heat also affects them as they are temperature rated over temp results in temporary short until they cool down this also triggers the switching action as the resistance due to heat becomes greater. Heat eventually can lead to fet failure in time.
Battery power isnt't required for testing as voltage is not being tested but just continuity/ohms.
If a controller fails it is hard or nigh on impossible to test where or what though the fet test is easiest to carry out.
Surely this still isn't right though, does this mean it's going to fail again if this is happening? Definitely seems like a flawed design unless my motor is just a poor matchAdding a heat sink may help a little with the fins being cooled by air flow, with warm ambient temps though that might not be enough.
The next option is to have a 5v mini fan attached to said heat sink and run if off a 18650 ether 1 or 2p. 5v fans only use about 50mv so a 18650 will run for days.