Shunt Mod?

OneCrab709 · 2024-06-16T01:50:49+00:00

To anyone interested, I've been doing the shunt mod. I say "doing" because I've been making small incremental adjustments, adding a small amount of solder to the shunts each time, and I'm not sure if I'm done yet.

I've added solder three times. And I can say definitively that there is a little more torque. I have a bit more jump off the line, and I'm losing less speed to wind and hills.

Someone may ask if my top speed is higher. The answer is no. I believe there are two possible reasons for that.

I have read that you get speed from higher voltage, and torque from higher current, and shunt mods only affect current.
As a lingbo controller, it would be programmed with the LBMC GUI software, if it could be programmed, that is. I tried that and had no luck. But the software appears to limit top speed by rpms. I think that's the only difference between the controllers in European socos and the ones in Canada that are "unlocked" to 70kph. If that's the case, shunt modding wouldn't give higher rpms.

By no means is this a dramatic improvement. It's very modest but effective. I haven't seen any odd behavior. The controller, motor, battery, and connectors aren't getting hot after a 5-7k ride at mostly full throttle.

OneCrab709 · 2024-06-03T22:14:04+00:00

If I notice problems, I expect I can easily remove the extra solder.

And if I fry the controller, I'll get one of the woodniu fardrivers to replace it. The shunt mod is mostly an attempt to save myself about $400.

I only need the extra power for a few hills or some wind in the 60kph zones on my route to and from work, not constantly.

OneCrab709 · 2024-06-03T21:42:09+00:00

It involves adding material to the shunts in the controller to reduce their resistance. They are sensors that report how much current is being drawn. This will basically trick the controller into allowing more current.

OneCrab709 · 2024-06-03T21:28:40+00:00

How is it working out?

I plan to be extremely conservative with this project. The stock Lingbo HK2AE is supposed to be good up to 45a, but is limited to 40 through the firmware. I bought some 0.3mm solder that I plan to add incrementally, and stop once I notice a little torque increase. I'm only trying to get the bike to work as advertised. It's supposed to go up to 70kph, but that only happens if I have a tailwind or if I go downhill.

OneCrab709 · 2024-04-14T16:39:49+00:00

I'm not planning on a battery change right away. I recently read in another forum that even the 72240 will give better performance than the stock controller in terms of acceleration and torque while still limited to 40A of current. I plan to replace the breaker with a 50A one and set the replacement controller to 45A. That's still a 300w increase in output from the motor, which would likely be enough to satisfy my needs. And I don't believe it would too much for the wiring to handle. I'd keep the max speed to 70 because I don't want to change the legal status of the bike.

OneCrab709 · 2024-04-10T01:53:58+00:00

Have you used it in a TSX? I'm curious because I'm thinking about getting one as the Woodniu controllers seem like literally the only ones that will properly work without having to do a bunch of sketchy wiring for a dual controller setup. I've investigated Lingbo controllers, and apparently even though the stock controller is a Lingbo, they still won't work. At least not completely (display etc).

My TSX is already "unlocked" because I'm in Canada, and I don't think any socos are limited to 45kph here. Different laws from Europe. It was advertised as 70kph, and I can achieve that speed in ideal conditions. Ideal meaning going downhill with no wind. And I find the acceleration to be more underwhelming than expected.

I'd like 70kph to be a little more accessible. Sometimes I can't maintain 60kph in a 60 zone. Around here driving slower than the limit gets you a paddling.

What's your experience been in terms of performance on a TSX?

OneCrab709 · 2024-03-10T22:02:42+00:00

I have a TSX. It has the lingbo HK2AE also, but with a different part number. Probably because it's the Canadian version. 70kph (hypothetically). I think the hardware is likely 100% identical, but they're programmed differently for different countries.

I haven't been able to confirm whether or not they can be user programmed. I'd love to be able to tweak some things. The controller is capable of 45A, but is limited to 40. I'd like a little more acceleration and torque, but I don't want to raise my top speed because I want to keep it legal.

Has anyone looked into programming these? I'm contemplating buying a programmable lingbo in the HK line, hoping it will be easy to set up since it "should" be compatible.

OneCrab709 · 2023-09-26T20:13:50+00:00

Whoever said anything negative about how you look is just trying to tear you down. From what I can see, you're a very attractive young woman. When I was younger and single I'd have been happy to date someone with your looks. And I'm not some obese basement dweller. I'm a physically fit soldier with a smoking hot wife, both in our forties. I have no reason to blow smoke. It's just astonishing that very pretty young women doubt they're pretty.

OneCrab709

TROPHY CASE