More Torque or Bad Idea? How To Shunt Mod a DYU V1 Controller - Voids Warranty! - Holmes Hobbies

John Holmes as a number of electric bikes in his collection of hobbies. Being drawn to the electrical side of anything, John likes to experience and of course tinker in the electronics of anything he rides or drives. In this video, he digs into the controller of his DYU V1 E-bike. First up, this will void the warranty, but this is what it will do. It will take that pokey feel of the e-bike and give it a bit more torque. More torque equals a much more fun ride! John will show you what tools and materials you need, how to take the controller apart, how to solder on your shunt mod and reassemble the controller. While it didn't pan out well on this bike (caused cutouts), other bikes may benefit from this hack.

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[HolmesHobbies]

Just a heads up, this mod caused cutouts on this model and we didn't get more speed. Had to use a higher voltage battery and higher quality controller to get more torque and speed, as seen here

[daveoxide]

Just want to help others from frying their controller if they try this mod... the wire used to decrease the shunt resistance needs to be MUCH smaller than what was used in this video. The wire will need to be 22-24awg, or smaller, depending on its length. A recent controller I modified used an SMD shunt resistor (similar to this video) of 2 mohms (that's 0.002 ohms). A 22awg piece of copper wire that was 1.5" long had an equivalent resistance, so adding that across the SMD gives an effective resistance of 1 mohm. Torque was dramatically increased and the controller gets warmer than it did prior, but not hot. Voltage drop, while accelerating, has increased as a result, which is my guess as to why the OP was experiencing cutouts after their mod (BMS shutting down due to too high current demand).

[dereklemos]

Just did this to my brothers Jetson Bolt Pro, just used a tiny dab of solder though. Seems to work great so far. Before at his weight he was doing 12-13mph, now its cruising at 17mph. I'll probably build him a better battery using P42a cells for it soon.

[michaelmcgarry]

REALLY WORKED FOR JETSON BOLT PRO. THANK YOU! Same top speed but tons more torque. Will wheelie if you lean back a little so be careful.

[thomasennenga]

Thank you sir for the infomative well done how to vids, I don't want a 80 MPH bike but to get across the street quick. or out of the way. just a few seconds to safety makes all the difference between a bad day and a good one. AGAIN THANK YOU

[twosons]

i think we may be seeing the progression to making some sweet e bike motors here

[isinertugrul]

Thank you so much sir. Approximately %30 torque increase in my scooter. And interestingly same battery and distance.

[joevasquez]

We use to do this on video cards for more overclocking room. We would just color the shunt with a grafite pencil from one end to the other.

[nicholasbarber]

"Was that a good noise?!" Lmmfao! I love those moments.

[frankh]

did this on my Ecosmart Razor, didnt change max speed but to climb a hill and on the acceleration is much better

[Ben-rjxs]

If you want to jump the shunts on your controller instead of using a small piece of copper it's much better to solder the shunts together that way you are getting a good connection which is very important doing this. Try soldering the shunts and try it again

[jasonbrown]

i did this mod, i went from 60amp to 97amps. it lasted maybe 20 miles. it actually died on me going super slow up a slight hill. i was going intentionally slow about 6mph, to watch the amp load from two different meters. at the time it stopped working i was using 10-30 amps average about 15 amps. it was a dirt trail that was a tad muddy, but i was not spinning the tire. all of a sudden it went limp. no popping sound, no smoke, but then again it appears to be sealed.

that was a long walk out of those trails/hills all the way back to pavement with what felt like an engaged brake. i had to drag that thing home another 3 miles once i got back to pavement.once i got home i unplugged the motor and it began to spin freely...uhg

i opened the controller up and found two destroyed mosfets. i ordered the replacements and just before i installed them i inspected the controller board very carefully and found many things were destroyed. almost looks like random traces underneath some layers of the pcb were fried and brown looking.

if i do this again, i will be very careful to only put a tiny amount, these two weeks waiting on my TWO new controllers this time of year sucks as i know the days are very limited at this point this time of year

[HB-couq]

Great video thanks I was pulling the last of my hair out figuring out the retaining bar. More videos please. How to wire them up properly etc and running diagnostic on them. I have lots I want to get working. Thanks

[CentralVAracer]

Really digging seeing more electric stuff like this in addition to the rc side.

[hhyk]

:) That's how you don't do this! This will smoke up in no time. Try with a little bit of solder on one end of the shunt and don't go over 20% increase....

[flitsies]

One thing I found with these controllers is that the heat dissipation is normally bad, I often after testing it first pull them apart and put in some better heat sink past it seems to make a huge difference as you get better cooling.

[aaronlittle]

Where's your video regarding the upgrade control box for the Jetson Bolt electric bike?

[benpit]

Thanks. Made me laugh. We have the same tinker talk lol.

[garyfyvie]

🎉that seems to be a great
lesson... ya got
to have some
thing bigger than this one.

[skatygarcia]

I guess your the only person on YouTube who can reprogram ebikes like Engwe, Aventon etc.. I couldn't find the software for reprogramming these bikes. There is a speed limit for it. Can you give me any idea?