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 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?

[@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

[@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.

[@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 👑

[@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?

[@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

[@wearesolarfarmers]

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

[@garyfyvie9490]

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

[@paulawestcott7228]

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

[@nukedathlonman]

Shunt mods are fun. :D

[@markcargill1185]

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

[@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

[@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.

[@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.

[@justforkidsentertainment3066]

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

[@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?????🤔🤔🤔👍👍👍👌👌👌👌👊👊👊

[@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.

[@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

[@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

[@mihaiureche5159]

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

[@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.

[@eduardosastre6224]

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

[@cynthiahenderson4917]

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

[@oldspiced]

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

[@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.

[@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

[@gearamihai2782]

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

[@HolmesHobbies]

your right, I beefed up the mosfets too!

[@markcozzie]

Shunt mod carrera ebike?

[@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

[@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.

[@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

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?

[@Mishakol1290]

I did this, and it turned my electric bike into the Wild Wacky Action Bike from South Park. I have a major concussion and 4 broken bones now. Thanks Holmes Hobbies. You have made my bike "impossible to ride". This is what it did to my bicycle: kzbin.info/www/bejne/qGKzn2CGq82MlZI

[@daveblair5883]

Do you fix controller

[@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.

[@Zeioth]

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

[@tennisedit]

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

[@hart-blocks]

Modifie evercross 350w evo8s

[@DanielinLaTuna]

Kris! (Kristofferson) wow

[@twosons5290]

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

[@nicholasbarber4193]

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

[@kevinwheeler7059]

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...

[@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

[@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

[@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.

[@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!

[@markwhitfield5412]

2nd hack ive seen with no follow on video, makes u wonder why...bullcrap, or it didnt do anything and not worth a follow on.

[@HolmesHobbies]

The shunt mod didnt work well on this bike because the motor is too slow to wake up on 36v. I had to increase voltage and use a controller with better mosfets, just dropped that vid here kzbin.info/www/bejne/m2a1YoKbfJx5ec0

[@frankh4238]

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

[@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

[@jamesishere6630]

hi there my wife and son have the DYU v8 and FF500 they are now complaining its slow in comparison to the other ebike i have, any recommendation what to do that is fast , plug-and play and DIY. should i just upgrade them to a 52v battery if so how to? will it even make a difference? any insight i would greatly appreciate it.

[@isinertugrul]

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

[@HolmesHobbies]

awesome!!!

[@MchooChoo2]

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

[@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.

[@mrcleanisin]

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

[@dg9bfc]

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

[@gelaymanheyres7916]

"void the warranty..! hahahaha😂😂😂😂

[@HolmesHobbies]

gotta do, what ya gotta do

[@dg9bfc]

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

[@tamasp1697]

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

[@gdubleu]

Should'nt you delete this video or leave a warning or something in the description that this did not work and ruined your controller and or battery. Not everyone is going to scroll halfway down the comments and read replies.

[@HolmesHobbies]

I'm pretty clear it voids the warranty and we are going to see what happens. I'll change the title though!

[@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.

[@benpit5012]

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

[@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.

[@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

[@dream_flower44]

Please help where do i but that pen thing

[@Vmaxfodder]

Fardriver.

[@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 !

[@Millzieeeee]

hate when people drag out 2 min videos to make the 10 mark

[@HolmesHobbies]

3 years ago, 10 minutes was practically required to get recommended play! Now we've got shorts. And long shorts. Should we cut this one into a short?

[@MakanaSalavea]

😊😊😊😊😊😊😊😊😊😊

[@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

[@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.

[@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. :)

[@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

[@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 😡

[@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 🙏

[@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.

[@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?

[@danielauen7790]

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

[@anio6865]

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

[@AGGYTAKEOVER]

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

[@aakashdahake]

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

[@ronaldgan4381]

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

[@GregStewartecosmology]

7:28 HAHAHAHHA comedy gold!!

[@kevmatt8450]

the chris d'elia of electronics

[@zachc5456]

It's not even worth it at this level😂 do a warrant dissaster series😂upgrade the battery and such

[@ammarzahid8228]

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

[@nixeetv5578]

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

[@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 .

[@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?

[@fluidmind3629]

can i mod citycoco harley x7 controler ? thanks !

[@BarbeRodzTV]

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

[@HolmesHobbies]

Have fun

[@hassanalitalia353]

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

[@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

[@poolhalljunky]

U need better closeups on the product u r working on. We like to see what is happening and what u r doing rather than no close ups. Do more closeups than of seeing you mostly and ur view count would go up dramatically... js...

[@HolmesHobbies]

We redid the studio shortly after this vid with an overhead and handheld for closeups.

[@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

[@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

[@Idiophones]

Where can I get 5VDC in side this PCB?

[@slashghero]

You have coolest watch man! 👌

[@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

[@thebowieman621]

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