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

[@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 kzbin.info/www/bejne/m2a1YoKbfJx5ec0

[@TMAX48]

Shunt mod worked great on my MX01 and MX02s controllers which are the same.

[@civicrocker]

I did the shunt mod on my 1000w speed controller and I modded it too much. According to my BMS it was drawing up to 4000w and the motor would do this funny thing where it felt like it was almost dragging a brake when punching it full while going slow. I actually had to reverse the mod and put it back to stock.

[@blank3097]

Could we see a video for the s2

[@fluidmind3629]

Hey can i mod citycoco harley x7 controler ? thanks !

[@danimayb]

@@TMAX48 Still working?

[@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).

[@stevedec1111]

@daveoxide so Dave i did this shunt mod by soldering an exact surface mount resistor to the existing one, there are actually 2 but I started with one. When I connected controller to bike an " unknown error code" came up on display. Luckily I had a replacement controller. Any suggestions?

[@dereklemos3769]

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.

[@umi.1498]

did u controller burn?

[@thomasennenga5705]

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

[@zaire.mg.]

Just got done with my shunt mod. That spring clip gave me HELL! Well putting it back on at least lol

[@michaelmcgarry2657]

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.

[@Tokemon72]

Is your bike still working?

[@CheffHD]

@@Tokemon72 no it caught fire

[@LouiePage-g1e]

​@@CheffHDreally

[@twosons5290]

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

[@joevasquez1776]

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.

[@leepatterson4009]

Colour the shunt? Would that work with this? Or very minimal difference?

[@CareLESSmAyhem]

@@leepatterson4009 Its just a matter of shorting it out, graphite is conductive enough to do it. Especially on a graphics card. But i would still sauder copper or a silicone wire on, if it's for an EV for the reliability.

[@nicholasbarber4193]

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

[@isinertugrul]

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

[@HolmesHobbies]

awesome!!!

[@jasonbrown467]

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

[@HolmesHobbies]

Low-speed asks more of the mosfets. 30 amps at 10% throttle is 300 amps in the fets, and most to220 bodies can't handle more than 100 to 120a before they start to thermally run away.

[@growingmj2865]

my e bike wheel spins but won't carry any one after changing the back wheel no power lost a clip to the disk brake any ideas everything turns on lights an no answer from seller

[@marthamryglod291]

@@HolmesHobbies are there MOSFET upgrades available? Like stuff the biggest/best ones in the controller before shunt modding. I don't know much. Just what I've read and watched. The goal for me would be to modify the controller to a point where it's still reliable, fixing the weak links.

[@robertmotion]

@@growingmj2865if you lift ur back wheel off the ground, turn throttle and ur wheel spins but u can't put a load (person) on the ebike, u misplaced a tiny little piece u need. It's called a keystock and it's like a clinch pin for the rotor + stator. ebik wheel will spin, but planetary gears aren't. ...this is where ur keystock comes into play. Hope this helps. /bklyn 👑

[@aaronlittle2176]

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

[@aaronlittle2176]

Well??

[@mudflap2020]

He just made a new video on it

[@frankh4238]

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

[@HB-co2uq]

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

[@HolmesHobbies]

Glad it helped

[@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.

[@marthamryglod291]

Does the heat paste go between the heatsink and case?

[@flitsies]

@@marthamryglod291 I put some on both sides so you end up with a sandwich so the heat can travel directly to the body which doubles up as the heat sink. They often use a sheet and grease but where they put grease use a good paste it's better than the grease.

[@marthamryglod291]

@@flitsies thank you!

[@flitsies]

I keep the sheet by the way in place, and that is sandwiched so it travels through the past through the sheet then through the past to the metal body. But the grease is removed.

[@Ben-rj7xs]

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

[@paragliding_croatia]

You have coolest watch man! 👌

[@liamdtraxxas2011]

Hi, grate video. Just a quick question, method to my madness if I use a thin bit of wire 0.3 26awg/ 0.5 22awg copper wire or a thicker bit of wire 1.5 18awg/2.0 16awg copper wire. Would the thinner bit of wire let less amps or less currant through will only do a little bit more top speed/acceleration, as a thicker bit of wire will allow more amps or current to flow through giving more power to motor for more top speed/acceleration am I right in thinking that or am I wrong?????🤔🤔🤔👍👍👍👌👌👌👌👊👊👊

[@wearesolarfarmers]

Side Note, not all controllers have physical shunts, soem companies use IC.

[@kucinskasz123]

I've also done this modifications. But sadly It took only one ride. In the end my controller mosfets got smoked and shorted my battery. Thankfully there was a fuse in my battery. :)

[@EDM-Jigger]

I think the reason that you didn't notice a different when you shunt modded your controller with the bike you were talking about is. probably because the throttle. curves for the original throttle is stopping it. That would be my assumption though

[@paulawestcott7228]

Can a 48v kelly controller be hop up to 60v? Lmk thanks for replies.

[@gelaymanheyres7916]

"void the warranty..! hahahaha😂😂😂😂

[@HolmesHobbies]

gotta do, what ya gotta do

[@garyfyvie9490]

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

[@MchooChoo2]

Would this work on a 48v 1600w?? Thanks.

[@Jayzkayaydancasper]

HI PLEQSE HELP WHAT COLOUR WIRE IS NORMALLY THE SPEED RESTRICTOR I HAVE A 48v 400w e bike and does 28mph I want it to hit at least 33 mph

[@tamasp1697]

Hi there do you have tune up idea for dyu d3?

[@the.Happy.Hermit]

Nice. Have you considered hooking the V1 controller up to the D1 bike to see if it provides better performance? Can't wait to see the next mod.

[@enes19992525]

I was wondering this too since the v1 controller is rated 350watt on it( v1 weird 400watt???) But the d1 Controller is rated for 500watt...

[@arvefo]

How to reduse speed from 35 to 19 km/t forever. Please show me. 48v 500w 22amh electric wheelchair handcycle tractor. Its great what you are doing.

[@hhy2k]

:) 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....

[@klg1001]

What do you mean?

[@gerbenposthumus8878]

My controller was gone in less than 20 seconds, i had bridge the shunt with copper wire and it seems that was a very bad idea.

[@skatygarcia3096]

I guess your the only person on KZbin 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?

[@HolmesHobbies]

@@skatygarcia3096 nah, I just replaced the controller completely

[@TheMrjogas]

Have controller issue putting ne controller after one ride only one speed like 20kmh usually 3speed working fine and then breaks something.what I need to look in controller to fix any idea.thanks for informative video.

[@AGGYONXBOX]

Can you not bridge it with a volt generator like whats in a tazer some of them.can produce 400k volts

[@nukedathlonman]

Shunt mods are fun. :D

[@mihaiureche1980]

Great video, thanks ! It would be possible to do this shunt mod on a KCQ-EMC7939 controller, taken from Aprilia esr2 e-scooter, which is already programmed with 3 speed settings (5/20/25 kmh ) ? Would increase speed or torque? Thank you

[@danielauen7790]

I bought a cheap 350w controller for until my 60a one gets here lol. Hopefully this helps if its gutless.

[@justforkidsentertainment3066]

Hello there! Is it safe to put copper wire on/ shunt and remove speed limiter at the same time? Thanks!

[@7thsoneli]

What are the cap sizes,I have a 36v razor controller and want to put a 48v battery in.Will I fry it or are the caps 63v?

[@dg9bfc]

the problem is getting that spring back in that holds the MOSFETs

[@anio6865]

Are you supposed to drain all the piwer out if the capacitors before you solder ? That is what someone ssid. How ?

[@joelsloper530]

I just got a juiced hyper scorpion is there any way to get a little more speed out of it I'm doing 31.5 mph would like to get around 35 ish thanks

[@nixonsmateruby1]

Thanks from England for info. Could you answer a question please. 4×12v7ah lead acid batteries don't move my bike, can you tell me a solution, and when I say won't move, I mean if you press a finger on the bike it can't move, and I'm stumped. The bike is 36v and when it was not powering I added another battery to 48v, but nothing. Any pointers will be greatly appreciated.

[@HolmesHobbies]

It worked on 36v?

[@BarbeRodzTV]

Thank you for sharing brother I will try to my scooter ❤

[@HolmesHobbies]

Have fun

[@LouiePage-g1e]

hvd-3 800w my controller has a R005 resistor I'm looking to place another on top to half the ohm. To 0.0025. .... The resistor is a 0.0005....question is what watt do i buy 1w 2w 3w 4w 5w... I haven't a clue can u help please

[@CentralVAracer]

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

[@kjdworks]

How did you get the spring steel that holds the components against the case

[@dg9bfc]

a screwdriver and then pull it out of the small slit

[@benpit5012]

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

[@sogalog1]

Hi I have Lehe K2 scooter that is giving me problems with the remote controls I have two both remotes occasionally work after a long time I have replaced with new button batteries but still getting problems Is there any way I can override the remote control and just switch on at the battery then press the start button on the Speedo face When I press the remote start button there is three positions at the bottom is start then alarm then unlock lock at the top The scooter makes a distorted noise when you switch the battery switch on then you are supposed to press the start button at the bottom of the remote then press a button on the speedo face It then says we are searching then connected if it’s set up on a mobile but this is not working maybe after about 20 goes it might 😡

[@ChrisMenendez609]

Can you answer this yes or no question please! Is it safe for a 500watt hub motor to be powered by a 48v 14ah battery and a 28 amp controller without it burning out or is that too much??

[@HolmesHobbies]

I would do it. A big hill could spell trouble for overheating. Your biggest concern will be wind resistance at top speed. If under 25mph, should be no worries.

[@ChrisMenendez609]

@@HolmesHobbies I live in Miami, Florida so I’m good there are no hills here :) thank you very much !

[@aakashdahake]

Hello I have locked controller for 20km/h, I need your help to determine what changes I should do to unlock it

[@gearamihai2782]

Just caution the shunt mod can cause the mosfet to blow up

[@HolmesHobbies]

your right, I beefed up the mosfets too!

[@mrcleanisin]

You didn't say whether the controller was for a brush motor or brushless motor

[@TMAX48]

Hi my controller has 2 R005, 5 miliohm smd shunt resistors. What is the best way to mod them as the max amps being produced by the controller is only 8 amps and the fets are rated for 25 amps please?

[@amagnu100]

What did you do in the end mate, I saw your video and that is some increased torque you have now, did you have any trouble with the display not being accurate after?

[@TMAX48]

@@amagnu100 I bridged the 2 resistors with wire links in parallel, i.e. bypassed them. Bike still working fine except when the bike is fully charged and you try to take off in full power, i.e. PAS 5 the display and power cuts out. So I only take off in PAS 3 and then if I go to PAS 5 when moving and all is ok. Bike is still working great and way more fun to ride especially on take off and climbing hills.

[@TMAX48]

Someone else I know just shorted out one of the resistors and still got loads more torque and acceleration, so I might try that on my MX02s as the frame vibrates with the extra power on takeoff.

[@dream_flower44]

Please help where do i but that pen thing

[@deanbryanhiponia3403]

can i also change my capacito from 63V to 100v?after this shunt mod

[@TMAX48]

Once the voltage of the capacitors is above the voltage of your battery when fully charged then there is no need to change them. The electrolytic capacitors also have a temperature rating so if the controller is getting much hotter after the mod it is worth upgrading them to the higher temperature operating ones and 100V ones too.

[@johnjames5712]

like most pcs of junk Chinese made products you dont need to worry about voiding there fake warranties any way considering their warranties are usually bit even worth the paper they are printed on when they dont and wont honer any warranty without making some one spend way more money or time to even try and get them to honer any of there fake warranties.

[@samspade4050]

And could you point everyone in the direction of controllers not made in china and if they aren’t made in china don’t use any Chinese parts

[@cynthiahenderson4917]

How to turn off the brake light from blinking off and on and get my Jetson electric scooter bolt on the way again

[@hassanalitalia353]

hello. to increase the speed what needs to be changed? the mosfets?

[@RacingUnderdogPH]

can you do this in reverse, like making a 30amp controller to an 11amp controller?

[@ulliu.3200]

No need to do this, if you motor is only 11A rated then it will not pull more amps from the controller. No matter if the controller is 11A, 25A, 50A etc.

[@Jakartax]

@@ulliu.3200 thats not true wtf

[@Zerobytexai]

I think I will shunt mod my Jetson Bolt Pro if you're familiar with it do you know if this mod will work for the Jetson? It's almost exactly like your little DYU bike. I might have questions for you later. That being said I will subscribe!

[@leepatterson4009]

Is there a follow up video? Did it work as I want to try this with a 36v 1000W controller I have across what looks like the same ZMD type resistor. Appreciate some feedback please.. Cheers

[@HolmesHobbies]

Nah, battery faults out

[@Bigbennek2]

Hello I like the video how long do I still have to wait to see you testing out the shunt modification and if it was worth the effort.

[@HolmesHobbies]

I'll save you the time, it just trips out and doesn't work now, lol! Been having a rough go at filming enough lately and ebike vids take a lot of time to do.

[@Zerobytexai]

@@HolmesHobbies Can you just unsolder the copper off and go back to normal? Also you said this can be done to any controller so any idea what happened with yours? Was it the shunt mod itself that ruined the controller?

[@yousefyousef-fj3qg]

@@HolmesHobbies I want your help , I have an electric scooter and its controller was burnt and I searched a lot and could not find the same so I bought another one but I did not know how to connect it, can you help me with that please?

[@arunmeena9147]

@@HolmesHobbies please do some test Like peak current after shunt adding or removing

[@SheikhN-bible-syndrome]

@@HolmesHobbies then take the dang video down or do you only care about getting views

[@Zerobytexai]

You mentioned that you can do this to any controller, so why did yours break? I'm questioning rather I should do mine now lol. It's a DYU/Jetson Bolt Pro

[@fluidmind3629]

can i mod citycoco harley x7 controler ? thanks !

[@Idiophones]

Where can I get 5VDC in side this PCB?

[@christopherowens2635]

Do you know if running a 36v battery and 36v rated controller on a 48v hub is legit? Like, will I ever run into any type of issues?

[@civicrocker]

You should t have any issues. You just won’t be getting the full speed it’s capable of.

[@chriss8206]

I have a 24v 350w controller and I want to add a led light bar what light should I get.

[@HolmesHobbies]

Search Amazon for 24v led lights and wire em in

[@nixeetv5578]

Can you use super capacitor to boost current? I have tried but nothing happened. Please help

[@benji376]

The perfect video doesn’t exi…

[@topyaw4335]

Does this work for any brushless motor?

[@Haiduk1985]

why to rebridge more the shunt if u could bridge the negative on the boards otherside? Just bridge there a wire of thickness of your feeling. Its more easy.

[@noahhorner5417]

Hello, I have a problem with the brakes If I put the High Brake Line on +, the engine just shuts off, but it doesn't brake. Can somebody help me?

[@HolmesHobbies]

There is no engine braking, it just Cuts power

[@eduardosastre6224]

sir why is my controller box has no this thing called Shunt, without this can i still hack my controller box, thank you...

[@dg9bfc]

main thing was to show how to pop out the metal spring that holds the fets

[@bereal1251]

Can I over volt a 48v ebike speed controller with a 72v battery pack the mosfet in the speed controller are 70v 100amp

[@michaellange7819]

No

[@markcozzie]

Shunt mod carrera ebike?

[@oldspiced]

"was that a good noise?!" Lol...

[@sothatgames1577]

It works great for my cheap 350watt controller. But i'm gonna put a switch on it becous my headlight doesn't work as good anymore

[@markcargill1185]

I believe the s2 means the steel rating. S2 tool steel is some decent stuff

[@thebowieman621]

I disconected my speed limiter in bolt pro went from 13mph to 75mph

[@GregStewartecosmology]

7:28 HAHAHAHHA comedy gold!!

[@Jayzkayaydancasper]

Bro this is insane I have the windgoo b20 36v 350w motor I was told it has not got a speed restrictor but only does max 15mph I want more oommmfffff how can I do this and get my bike to go faster just a little bit more faster

[@marcinka5865]

@HolmesHobbies did it work for you? I did it on mine controller (different e-scooter) and it didn't take any effect. Still has the same top speed as before.

[@ammarzahid8228]

How to decrease speed on ebike same controller to make it 24 kmph

[@guitartec]

I can't do this mod, cause Juiced Bikes thought it would be hilarious to pot their ECUs with epoxy. Ugh!

[@Gunjaroo]

That’s to keep it cool…

[@guitartec]

@@Gunjaroo Actually, it's mainly to keep people out so they cant modify it. Secondly, potting keeps moisture out, which is always a companies official reason to pot electronics of any kind. Airflow via fans or natural air movement would keep the ecu cooler than epoxy potting it, hence the new vents Juiced now has in the RCS's downtube.

[@daveblair5883]

Do you fix controller

[@leoszilard3998]

The shunt mods that I did and confirmed with a (Kyoritsu )dc clamp meter is that the mod just makes the current metering on the controller go out of calibration,It does not change bias or make more current flow through the mosfets.The on resistance of the mosfets on most controllers from source to drain is in the milli ohms.And the shunt is in series with that,Your current to the motor is limited by the Battery BMS,Wire diameter from battery to the controller and controller to the motor and the cross sectional area of the traces on the circuit board at the mosfets source and drain.

[@DBrownCo]

So what was the result?

[@HolmesHobbies]

broke the controller. I made another vid but it seems to have gotten lost in edit.

[@DBrownCo]

@@HolmesHobbies Oh Thanks :)

[@PaawnHuuub]

@@HolmesHobbies lol a follow up would be good????

[@Zerobytexai]

@@HolmesHobbies I want to do a simple shunt mod on the Jetson Bolt Pro. It's like your small DUY bike. If you're familiar with the Jetson PRO do you know if this mod will work or not?

[@jerryirby7887]

Yes HELLO IM NOTORUS IRBY I LIVE IN NEWARK NEW JERSEY AND I NEED SOME ONE HELP ME GET MY REARS 1200 SINGLE MOTOR ON MY ESCOOTER HOPE YOU IS CLOSE TO WHERE I LIVE I DO NEED HELP I DONT NOW WHERE IS THE LIMITED WIRE IS AND THE SCOOTER IS 60 VOLTS BUT THE STROTTLE Says 52 VOLTS AND WHY IS THAT IS THAS A PROBLEM PLEASE HELP ME IWANT IT MORE FASTER 🙏

[@pensivesquid308]

How's the battery consumption? does it make the battery pack fast-draining after the mod? I need some answers/feedback, please. haha.

these cheap controllers are so much more reliable than a standard RC ESC (par example) brcause they have a form of current limiting. Increasing that (slow*) current limit to infinity is really stupid because: - if a fet dies in the h-bridge, you fry the cables, motor and endanger the battery. If the battery gas a poor short protection you're in for fireworks too. - the shunt is only monitoring the overall, slow, current fluctuations, not the fast and spiky per phase currents that can be 10x the average general current. Even the cheap controllers monitor and limit the fast currents with a bemf discriminatory logic or an actuall copper trace shunt on each phase. So, completely removing that fire protection is really stupid. Yes, decrease the shunt value, maybe, to get a little more umph,.. but not to damn zero. I actually prefer to increase the shunt value for less peak battery draw.

[@JandCanO]

Would you say using a resistor in parallel would be better? If the current is small on this part of the controller and the voltage drop is all that matters a small resistor should do right?

[@Lucar30260]

si vous voulez plus de couple et de vitesse faut modifier le moteur monter les phases en triangle car tout les moteur sont câblés en étoiles. mais consommeras plus énergies. et le moteur chauffera beaucoup plus.

[@ronaldgan4381]

Hi there , would like to ask for ur professional opinion about how to jail break a China made controller

[@kevmatt8450]

the chris d'elia of electronics

[@pronation888]

why not just replace the controller that can handle more amps?

[@UtubeSurfer7]

Can you just buy a new upgraded controller?

[@HolmesHobbies]

yeah, but where's the fun in that?

[@UtubeSurfer7]

@@HolmesHobbies im just asking because I have nooo idea how to do this but would like to boost performance, so I thought maybe a new controller would be the way to go for me .

[@jaybernie4160]

Hi HolmesHobbies I have a Hover-1 Electric scooter but however the controller seem to not working and I need help to find a controller or how modify it to make it work and I have no power whatsoever

[@Zeioth]

Fuck, mine has some kind of insulation on the inside covering everything. I can't even see the voltage of the capacitors.

[@MrLunithy]

lol rip warranty I love it.

[@ricardofreire8951]

it works for me