Does Increasing the Motor Kv value Increase an RC Cars Top Speed?

[@lawrencewinter]

Hi guys, some useful intel in there for me. I'm totally new to the hobby, but I teach Physics at a high school. It's my understanding that the rotating magnet in the brushless motor will generate a back EMF which is in fact the limiting factor in its top rotational velocity at a given voltage. The more turns in the motor will increase the back emf at a given RPM which is why higher KV motors have lower turns of coils in the motor. Lower KV motors deliver much more torque at low RPMs but cannot reach high RPMs because they quickly generate a back EMF as RPM rises. Higher KV motors have fewer turns - which gives less force (torque) and so the acceleration is less but the top end is more. It may be useful to mention this too. Unless I'm horribly mistaken - forgive me if so.

[@rcyalater...2305]

This makes sense as to the little I understand. It seems bigger, heavier vehicles do better with a lower kv, as lighter one do ok upping the kv's

[@toolbaggers]

All inrunner motors have a max RPM rating of of around 50,000. Anything higher than its max rating will make the magnets on the rotor shatter.

[@SebastianLong]

You are correct, but that being said some people increase the timing on their motors which in theory increases the kv of said motor and reduces the overall torque. Increasing the timing (magnet will switch from positive to negative or vice versa sooner) produces more heat while allowing the motor to spin faster. The reason it is able to do this is the rotor spins faster as there is more distance between the positive and negative poles trying to attract each other. Understanding how the positive and negative switches to make the rotor turn is a completely different storyline all together. All in all its very similar to advancing your timing on an old distributer powered car. Making the spark plug ignite the fuel mixture sooner so the majority of the burn happens sooner on the combustion stroke.

[@SebastianLong]

You are correct, but that being said some people increase the timing on their motors which in theory increases the kv of said motor and reduces the overall torque. Increasing the timing (magnet will switch from positive to negative or vice versa sooner) produces more heat while allowing the motor to spin faster. The reason it is able to do this is the rotor spins faster as there is more distance between the positive and negative poles trying to attract each other. Understanding how the positive and negative switches to make the rotor turn is a completely different storyline all together. All in all its very similar to advancing your timing on an old distributer powered car. Making the spark plug ignite the fuel mixture sooner so the majority of the burn happens sooner on the combustion stroke.

[@shakenbake2k479]

Yep, lower turn higher kilovolt rating.

[@thump3r]

these videos are the best info ive heard in years for rc!! DONT STOP!

[@RCexplained]

Thanks for the comment!

[@king82rc36]

Thanks a lot man you're like an RC professor was looking for someone to tell me the science behind the RCs 💯

[@RCexplained]

Wow, thanks! Glad I can help!

[@humlakullen]

Can’t believe I just discovered your channel… Absolutely awesome work. Thanks a million!

[@dnml4713]

I think what you're trying to say is that the light that burns twice a bright, burns half as long....

[@NabiL_Lam]

Thank you for teaching us how to make our rc cars faster

[@RCexplained]

No problem 👍 Any time

[@scaleworksRC]

Awesome breakdown. I'm new to speed running and just now in the 70s. My ESC has motor timing settings that I could play with, but I still need to learn more before I change anything.

[@RCexplained]

Thanks for the comment. Just recently I did a few videos on timing that you may want to check out.

[@scaleworksRC]

@@RCexplained Yep, I'm watching a couple older ones now and it's pretty similar to a piston engine like you said in the video 👍

[@bryanbolich5469]

There's more to it then that. Like amp draw, power to weight ratio, WATTS power of the motor. Higher Kv uses less voltage but more amps in order to get closer to the (Watts) actual power. But also shortens the run time. The specs show it all. Look at the volts and amps on the specs. Lower kv doesn't just mean longer run time. It means it requires more batteries then higher Kv motors to reach it's true WATTS OR POWER you need for faster speed.

[@joeyboy8200]

Very informative. Thanks for the great review. Hope this channel really grows. Subscribed.

[@RCexplained]

Thanks for the sub!

[@rcyalater...2305]

Learning so much. Don't ask why it took so long to subscribe. Keep up the great vids!

[@RCexplained]

Awesome, thank you!

[@cobrakilleridis2650]

yes buddy, you are a big helper for understanding more things around RC hobbies. keep that way!!!

[@Rcjamaica876]

I hve a wltoys 124017 i want to use 3650 and a 4s esc .what kv do you recommend please ..and yes i want it to be a speed run car

[@rcbustanut2057]

This is excellent info bro😎👍 There are however motors out there that can handle the issue most higher kv motors have, which like you mentioned, is that they have smaller can size & overheat quicker. TP power motors have a nice selection of higher kv motors with large can size & capable of handling higher voltages & current than most common motor companies offering the same kv value. I'm in the middle of working on a 4S high speed project, an Arrma Typhon 6S stretched build. Castle XLX2 controller. While the XLX2 can handle 8S & I can easily get this car over 120mph running 8S, I realized that I can run a higher kv motor, with a decent current rating, on half the voltage & still achieve high speeds & not worry about the too much current being pulled from the ESC, since the XLX2 can handle over 500A. I ran as a test an old hobbywing ezrun 2200kv motor I had on this new stretched Typhon 6S with a 34T/34T gearing on 4S. Pulled 207A from the ESC & hit 85mph. Did 3 runs back to back @85mph & i could still keep my fingers on the motor. My gear calculator estimated 86mph with this setup so I definitely was hitting max on my runs. Even with this "not top of the line" 2200kv motor, with a minor gear change & still running 4S, I should be able to get over the 100mph mark. Next motor will be either a TP Power motor or the Castle 1721 2400kv motor. Looking forward to breaking ~110mph on 4S. I know it's possible & even higher as others have already done so.

[@RCexplained]

Amazing man. I hope you are having a lot of fun experimenting with the different setups and tweaks. Have you seen this video? kzbin.info/www/bejne/o6Ozm4x7orKDnKM

[@rcbustanut2057]

@@RCexplained Just watched, awe man... That's exactly what I wanted to see. The inside structure of these two exact motors & you got them both on 1 video lol, thanks you thank you!! 👍👍 I was just on TPs site yesterday and noticed the "regular, cm & scm" types but didn't get a chance to dig & see the differences so that was very helpful as well. 👍 One thing I like about TP is that they actually give you a "continuous" & "peak" (along with peak runtime). This is helpful when breaking down a current draw chart for the different LIPO batteries (2S,3S,4S,ect.) at max wattage. This makes gearing easier, as it lets you know what's the max gearing at a certain voltage level you can push to reach the max wattage that a motor can handle (wattage/voltage =amps). As much as I love the Castle products because they are indeed excellent, as an electrical engineer, I hate their lack of data/specifications on their products. Thanks for the awesome link & taking the time to make these videos, they're absolutely helpful 😎👍

[@RCexplained]

Right On. I will be doing a video soon on the specifications of the motor. Things like Io and Rm also relating it back to a theoretical max continuous and peak power output. Stay Tuned. 😎

[@TheSermor5]

Mr. Joule was well aware of the significant issue at hand. I xI x R = ...HOT :-)) As the copper ceased to be a viable option and melted away, we began to grasp the concept of harnessing and utilizing light. This was the advent of "electricity." ...more or less until now.

[@tonya9614]

Seems simple enough, I just wonder why sounds so complicated!

[@isaackshirley4695]

Ikr

[@foellerd]

Oof, I recently put a 4370 KV brushless motor in my 1/10th scale Redcat Volcano. With it I put in a 60 amp ESC that has a fan on it and use a 50C 2S battery with 5200mah capacity. Basically I did all this before watching this video and have some concerns now. Haha. Im about to head to you brushless motor hesitation video since this setup struggles with that issue badly. Learning alot quickly right now. Thankyou good sir.

[@RCexplained]

Glad you are learning by using the videos. Thanks for the comment.

[@lexhtfdct7230]

What's a good ESC, motor , spur, pinion set up for my XMAXX for bashing , 80mph , cool temps and battery

[@Athiril]

There’s another way to do it, since the output is due to current and resistance of the motor, higher kV has lower resistance. Way higher kV would work better, higher voltage with less current is another way to do it. You can balance that with lower gearing, or even just program a throttle limit to limit the rpm from excessive kV + high voltage so it’s like lower kV motor but with less heat output, that’s done on quads commonly since the flight controller runs software that can handle limiting throttle. I have a motor in mine that resistivity may be 0.04 ohms, at 40A, gives 64W. If we move from 2s to 3s and either down gear or limit to 67% throttle, or smaller pinion and bigger spur etc, an equivalent speed would run around 26.7A giving only 28.4W of heat. Moving up in kV if you can’t move up in motor size also lowers resistance.

[@chrisbryan6493]

Wow!! Very informative!! I just bought an infraction with TP 4050cm 2300kv 8s Looks like 70,000Rpm unloaded!! I’m not sure if that’s a good motor set up for anything other than speed runs.. any ideas? Not familiar with TP CM motors.. Thanks

[@RCexplained]

Hi Chris, 70k RPM unloaded is definitely for speed runs.

[@GothKid1996]

Yes but only if the gear ratio remains the same, lower kv with higher gear ratio provides a longer lasting esc and motor, and allows for a beefier pinion gear.

[@mad1pengu619]

You never mentioned adding a heatsink. It is a good way to reduce heat without having to upgrade the can size.

[@LawrenceTimme]

Yes a fan can also help a lot as well of there isn't already airflow over the motor.

[@mad1pengu619]

@@LawrenceTimme Yes, by heatsink I also meant that you could put a fan on it. Thanks for clearing it up.

[@NotSoJDM18]

Always great information! Keep up the vids man! Love learning anything I can!

[@RcOffroad9513]

The video was a bit confusing? You talked about how you had maxed out the 2200kv thermally, then later said you maxed the 2650? I already am familiar with volts, kv, size, ect.. so I knew you had misspoken, or dont know what your talking about. Maybe make a script so your not so confusing? You said you were close to the thermal point of the 2200kv and near the end you said you had run close to thermal with the 2650 can, so which is it? Being you went from 2200kv to a 2650kv, you made example of the 2200kv being at its limit. I get it... but it is confusing. Love your work keep it up but mabey if explaining stuff make it more logical, hope you get what I'm saying... not dissing at all, I really appreciate your work but the vast majority will find it very confusing. My opinion, no offence.

[@dr0n3droid]

@@RcOffroad9513 There is definitely need for a deeper dive here. It's a complicated topic. I believe he did an excellent job of explaining the differences between the two motors, but I agree it was somewhat hard to follow as he jumps around a bit.

[@RCexplained]

Fair point RC OFFROAD RACING and dr0n3droid. I should have explained the 2 different scenario's a lot more clearly, I can see how the ideas appear to be bouncing around in this video. I've added more clarity in the description as a result of your feedback. Thanks for the comments!

[@tedsimington7654]

Thank you so much that was very informative👍

[@jimmyv1753]

Well there is actually a lot more to it than simple RPM. You can actually increase your top speed by lowering the KV and increasing the gearing. I’m curious to see your results because I’m going to be running the same experiment. Going from a 2050kv to a 1700kv swapping the gear to a high speed gear and see what happens

[@FZERO20]

What would happen with heat? Would it get hot faster or slower?

[@jimmyv1753]

@@FZERO20 too much heat is bad. Lower temps as a general rule is better

[@truckdriver8384]

Lower kv motor should be much more efficient, in terms of heat/amps, with higher gears vs the high kv.

[@jimmyv1753]

@@FZERO20 it gets hot faster with the lower kv motor. Especially when your looking to increase top speed. You’re putting a lot more torque against the motor. Sorry I must’ve been preoccupied when I first responded. I hadn’t read the question correctly

[@FZERO20]

@@jimmyv1753 😂😂yo I totally forgot about this. And I see your previous comment, I suppose when I saw it at the time I didn’t know how to respond so I just left it lol. But okay, that’s interesting info to hear. Rn I have this Wltoys 124016 with a 3650 brushless upgrade. An 8.5t mod V5R motor on stock gearing. The car is amazing and really fast. I can run laps and the heat on it is what I would say, “really warm, but not hot”. Supposedly you can run low kV/high gearing on motors that have larger can sizes because they can.. of course handle and dissipate the heat way better. So if you can upgrade motor diameter while keeping kV low, you may get away with it. Add a fan or too👍🏾😁

[@toolbaggers]

Higher kV motors can handle higher current loads so when properly geared, they can handle more power

[@bolitapelona]

Lower KV motors use higher voltage thus less current, less heat, longer life and run times. Lower KV is the same as getting a physically bigger motor that does not spin as fast, but has more torque. Motorcycle motors spin faster, but don't have the torque to pull a heavy load. Same for electric.

[@toddleavitt3366]

Also when you change KV you also affect torque of the motor too even more so when the size of the can changes too the length of the can affects heat dissipation and torque which is important when you go with bigger vehicles. Normally brushless motors will have another 4 digit number and that specifies the can size and length. A 3660 motor is 36 mm in diameter and 60mm in length. Just more to take into account

[@ero3112]

Ezrun max8 g2 hobbywing i like to go for my savage nitro. What gear ratio for 3 speed original box

[@ero3112]

Good content and background.

[@alexherrera3918]

👍👍👍Great video and very importan in motor selection since many rc plane brushless motors do not include temperature limitation or even maximum desing current. How do you know that the proposed motor is aout at is thermal limination? got lost on that part. Do how i know max current for a brushless motor if not provided by manufacturer and i do not want to buy a bench test and test it myself, if there a way to calculate it? I am a new subscriber!!!!!!!!!!! thanks

[@toolbaggers]

All inrunner motors have a max RPM rating of of around 50,000. Anything higher than its max rating will make the magnets on the rotor shatter.

[@AnthonyGonzalez-lw1ek]

What would you recommend and anyone who has done this safely for a Dakar or desert Baja runner for a good setup . This applies to all input , I don’t wish for a crazy speed demon. The truck will be a both 4X4 stampede n slash

[@nealstarling5422]

So if I use a lower kv motor and gear it up, will that be more efficient than using a higher kv and gearing it down ? In other words, mathematically I could get the same final rpm but which will give me more run time ? Low kv high gears or high kv with low gearing given everything else is equal 🤔

[@harrystephens2061]

Highest voltage + lowest KV motor = correct amp esc. The head room left in the esc is for buying the slightly more KV motor.

[@ChiefRickyRC]

Thanks for the knowledge friend

[@Clownmeati8]

Thank you for real information in your content instead of flashy look at me stuff.. Im building an airboat using an arrma 2050 kv 8scale motor on 6s. Other than weight being factor, any problems with high rpm and low load? Seems like the motor wont even feel a prop compared to moving a car with tires.. I dont have friends into rc so sorry for asking here!

[@RCexplained]

Sounds like far too much kv for any decent size prop. What prop have you calculated for this high of an RPM?

[@robsmith1975]

Great video professor!

[@RCexplained]

Thank you!

[@chengong388]

But increasing kv is more efficient because faster speed at lower load is more efficient for the motor right? Compared to changing the gear ratio?

[@driftking2909]

I have a question so I’m running a 34t spur and 30t pinion on my Arrma typhon what motor would u recommend for that gearing

[@zdattonejones6709]

Thanks again for sharing your notes

[@RCexplained]

Thanks for the comment!

[@gregsandy6560]

This is kind of off topic. When using 2 batteries (in series or parelle) is it true that the second battery is NOT monitored by the ESC for low voltage cut off at 3.7 volts or 4 volts DC.

[@RCexplained]

Hi Greg. In general, if two batteries are connected in parallel to power an ESC, then both batteries will be monitored for low voltage cut off. This is because the voltage across both batteries is essentially the same, and the ESC is designed to monitor the overall voltage level. However, if two batteries are connected in series to power an ESC, then the situation is a bit more complicated. In this case, the voltage across both batteries will be added together, and the resulting voltage will be monitored by the ESC for low voltage cut off. The ESC in both situations can not detect if a single cell enters LV as the ESC only sees total voltage.

[@remkojerphanion4686]

Another good video, keep 'm comin' !

[@RCexplained]

More to come!

[@scottm2398]

What about the same size can but different kv??

[@samlinworth5440]

KEEP GOING. GREAT INFORMATIVE VIDEOS BRO. 👍

[@RCexplained]

Thanks 👍

[@mam362]

Awesome video. I have always considered increased KV as getting top speed in exchange for slower acceleration and increased motor heat

[@RCexplained]

Thanks for the comment!

[@jerimiahcampbell3828]

I have a Vortex R10.1 Pro Brushless ESC 170A, 2S And a hobbywing 7t on my ECX amp MT. I’ve stripped two sets of gears, but before that happened it topped out at about 28 MPH. It’s geared at 22/87, running on a 5200 2S lipo. Will I have to replace the motor to hit 50? I didn’t know much about aw sores/sensorless when I purchased the combo, and I think the esc is compatible with either.

[@ecxampbasher7811]

I have ecx amp Mt on 2s lipo 3650 can 3900 kV gearing 22/87 top speed 40 mph with the body 38 without the body haven't tried 3s yet

[@reallythough4591]

Drop your spur gear to a 64, and your speed will increase by around half. The closer you get to one to one gearing, the faster the car, the more amps(heat). So limit the runs, heatsink and fans.

[@dupiomaricson8591]

Yes I believe that because before my motor is 3900kv the tire is not ballooning but I Chace the motor to 6200kv the motor is balloning

[@RobertCarrizal]

Hi RCexplained i have one for my traxxas maxx 4s it was stock 2400kv 540xl brushless how much heating

[@NBC_NCO]

You may be losing torque during this process...so if you're not doing speed runs...your overall lap time might actually slow down.

[@gluka47]

Where was this video 14 years ago?

[@sammygonzalez7627]

I always had my doubts about the kv, so if you have a castle mamba monster 8s a 2200kv is faster than a 1650kv on this esc combo ?

[@TKO593]

I just hit 100mph with the 6s Typhon on stock electronics. 150a firma esc and 2050kv motor. All I did was mess with gearing, suspension, and tires.

[@RCexplained]

That is awesome!

[@maeldomain]

I'm watching you for days , You're the only reason why I haven't bought any more brushless motor, The more I watch the more I hesitate to buy. I'm currently looking at the 3300kv brushless motor with a max 18amp. Does it gonna suffice for crawling? With 2 speed gearbox on it?

[@lucaswatts1484]

Should be fine, might send it a bit fast lol

[@Jackie-wg5dy]

No go for a 1000 kv or a bit higher. More torque and lower speed for a crawler is better than less torque and more speed.

[@MyKonaRC]

go with a brushed 55 turn motor.

[@ChiefRickyRC]

All the specs on this new 2845 5900kv which are 2s,3s 35-60amp which are the same on the Q901 and X04A so this is my plan.

[@TheGetintoit]

Hi nice info video. I have a HOBBYWING EZRUN 3652 BRUSGLESS MOTOR 4000kv will A HOBBYWING EZRUN 60A Brushless ESC run the motor with no problems ?

[@MyKonaRC]

yes.

[@nubletten]

Hereka, I found free usable knowledge.

[@andersdaun3950]

Awsome video!

[@RCexplained]

Glad you enjoyed it

[@nickwilliams6869]

How does the esc work with the motor

[@earthisfat6184]

The guy at hobby town talked me into an 85 Amp 4k kv motor Instead of the 3500kv motor I wanted and the 4k kv cogs out with my gearing. I don't like not having low end. With my old 3500kv I could do standing back flips

[@RCexplained]

The higher kv motor should also be able to do back flips, if it is getting the necessary current in amps. If not, try dropping a few teeth on the motors pinion gear. This will surely help. You can also check out this video: kzbin.info/www/bejne/g2POaISipL2JhNE

[@earthisfat6184]

I went from 17 tooth to 13 and it's a tiny bit better but not much. It has to get rolling before it will take off.

[@RCexplained]

what is the average internal resistance per cell?

[@earthisfat6184]

@@RCexplained in my battery? Idk it's a 3s 50c 5k mah

[@pawelwolski1316]

I watched now 3 or 4 of your motor videos, so I did try to find this info on my own before bugging you. Where does the torque output come into play? You always say that the RPM calculations are for no load condition. Will a given kv motor simply draw more current to achieve that calculated no load RPM, less some "internal" losses? Well then everything gets hot, more resistance and something burns up. As you can tell still thinking in internal combustion terms. Thx.

[@RCexplained]

Hi Pawel, the amount of current that the motor draws depends on the load and torque that the motor must apply. For an RC car this is always changing depending on many factors.

[@pawelwolski1316]

@@RCexplained Yes I do understand that. So will a a given kv motor achieve the calculated RPM if enough current is supplied? That was the real question I guess, sorry for writing an assay in part 1. Don't tell anyone , but long time ago I took a circuits class in college...."Twinkle, twinkle little star, voltage equals I x R"....is all I remember.

[@RCexplained]

I've never come across that song before. That's awesome! The more that you load up the power system, the lower the maximum RPM output of the motor. More current gets you further away from the no-load RPM.

[@pawelwolski1316]

@@RCexplained Well I kind on made that little song up long time ago. Sorry to be a pain, again I understand the above as well. If you still have patience.....So I want to achieve that "rated" kv RPM, I got my voltage, I can size the esc now for given amperage. So how do I select the motor that will be able to achieve the rpm I am looking for under the load of my 1/8 buggy? You can point me to the right video as well, I am not lazy, just can't connect this dot. Appreciated.

[@POLITICALYCORRECTify]

put it simply though its not about speed its torque we want. Thats why the 2200 is so much better than the 2650. PLUS, LOWER KV CAN PUSH A HIGHER GEAR because of the Tork.

[@joshbaker43]

Running a 5900kv motor in a 1\10 scale buggy it is off the charts fast but gets heat soaked quickly so my problem is I don't want to get rid of the speed but I want to make it run cooler so do I bite the bullet and downsize or do I buy a duel cooling fan setup?

[@RCexplained]

You can try adding heat sinks and fans. This will help remove heat. You can also look at getting a larger 5900Kv motor to get rid of more waste heat through larger surface area.

[@afifahnasuha7528]

Do more rpm will need more ampere?

[@2112inuyasha]

I went from 56 112 motor with 750kv to a 70 120 motor with 680 kv in my baja 5b

[@alanjose7894]

Que dizer então quero motor de 2250 e mais forte que o 2650 e dará mais velocidade isso?

[@ZyaLuke]

Great videos! A little over my head at times lol. The one thing I'm trying to figure out is how much less efficient are higher kV motors compared to lower kV motors, specifically for a 7'" quad, 1300 kV or 1800 kV? Say I flew for like 20 minutes on 1300 kv would the 1800 kv be 1 minute less flight time, 30 sec, 10 sec? Or as long as you are flying exactly the same would the efficiency be about the same? I've heard people talk about setting a throttle curve with the higher KV motors. I'm just trying to figure out if the efficiency hit is worth the extra power or not.

[@RCexplained]

Hello, your question is not a simple one to answer as the factors that come in to play are more then just a matter of 1800vs1300kv. To realistic determine this in your specific application, the best solution would be to test it using the exact equipment and flying style.

[@ZyaLuke]

@@RCexplained thanks for the response. I was just looking at getting the iFlight Chimera7 and it comes in either 1300 kv (cruiser) or 1800 kv (speed cruiser) and I was thinking about getting the 1800 kv because it can put out more power but at the same time the more important thing to me is range, mountain surfing and I was hoping to find some info on the positives and negatives on those 2 different KVs in order to help me make an informed decision but I'm not having any luck in that department. Lol

[@RCexplained]

take a look at the video just released

[@ZyaLuke]

@@RCexplained awesome! I watched it a couple times! lol. So what you're saying is that these motors are most efficient when running at 100%, right? So the higher KV motor would be efficient as long as you are close to 100% throttle but of course you'd be moving a lot faster and at some point I would assume that drag would start to affect the efficiency, right? And I'm new to this world so I don't know what the best cruising speed would be for mountain surfing. I am a little confused because my MA2 is more efficient (can cover more ground) in N mode at about 24mph than it is in S mode at about 44mph, I thought full throttle was more efficient, what I'm I missing? lol

[@RCexplained]

When we are talking about efficiency, what exactly are you referring to. Efficiency in the video is mechanical power over electrical power in. Problem is 100% throttle is not practical for most of my RC's if max run time is the goal. 100% throttle on a slower setup would be more ideal.

[@jkhippie5929]

RC explained I have a question. Maybe I wanted to stay in the same motor size lets say 3650 and I had one motor 2050kv and another 3500kv , but I chose to to run the 2050 kv at 7.7 gear ratio overall and the 3500kv at 12:1 overall .... the tire speed will be the same for both motors, but the load will be very different because of the gears.... So the 2050 would get hotter than the 3500 because of the extra load correct ? or will it be the same roughly because the speed of the car is the same. Thank you.

[@jkhippie5929]

both running 11.1 volts ....

[@xKevmachinex]

quick question, I have a 4092 1530kv motor running on a 120a esc and 3s 120c 8400mah battery and for the most part it runs fine, bit of coggin in grass on take off or if im stopped on a hill going up. I wanted to buy a 4s battery to try it out, just out of curiousty and since my esc handles up to a 4s lipo. I found one thats in my price range, but the c rating is way lower then my 3s. this battery is a 4s 7000mah but only 35c. I am running a 17t pinion and 48t spur with 155mm wheels. My worry is that the battery will be damaged or explode if my esc or motor trys to pull more current then it can supply? or is that not something to worry about because the battery will only give out its max rated power? I hope this makes sense. thanks!

[@RCexplained]

You can monitor Temps of the battery to ensure that it does not exceed 140F

[@TheAgTeam]

So for planes and EDF, could I change to an 11 blade from a 5, without the extra torque overloading the motor do you think?

[@RCexplained]

The extra load of the additional 6 fan blades will increase the current draw / load on the motor.

[@coffeedude2024]

Hi great video! Quick question, I'm think of jumping from a 2200kv TP Power motor to the 2700kv motor. Both motors have exactly the same can size and are pretty big being over 10cm long. However will the 2700kv motor have the same lower down grunt and torque as the 2200kv motor if they are both run on 6S? Or will the 2700kv motor have lower los down torque even though it produces more current? Thanks and awesome channel! Keep up the great work!

[@RCexplained]

They both have the potential to deliver the same torque at low RPM. It all depends on your setup and its potential to deliver the increased amount of current effectively.

[@coffeedude2024]

@@RCexplained thanks for your reply and advice. It's much appreciated👍

[@ArmanRC]

got it, 2200 kv it best for limit thermal, thanks for the explanation

[@Bigbopperairguns]

Without watching the hole video, which one is faster?

[@ChiefRickyRC]

Im about to go from a 2847 3000kv to a 2845 5900kv in my X04A. I want to double the speed and this will do it right? Stock set up with no extra cooling stays cool on 3s ripping it so I should be good maybe add water cooling...ill post a video see it goes hopefully might be a good example. It'll be quick video

[@RCexplained]

With a big increase of speed, you will have a big increase in heat. Make certain nothing exceeds max temperature threshold.

[@ChiefRickyRC]

@@RCexplained exactly! I just spent a hour leaving answers for people wondering about changing the motors. I used your knowledge btw, so your words go far. Appreciate all the videos and ill send everyone youre way who's looking to also learn.

[@ChiefRickyRC]

@@RCexplained its also a experiment. With motors only about $10 its worth the chaos haha

[@MyKonaRC]

Would have been nice if you talked about how high KV equals speed but low torque, low KV equals more torque low speed.

[@RCexplained]

If you are comparing high vs low Kv motors of equal can size and brand - speed as in RPM and torque potential are equal.

[@MyKonaRC]

@@RCexplained I don't think so, even in brushed motors. A 55 turn would have way more torque than top speed rpm, while if you applied a heavy load to a low turn motor ( 10 turn) it would burn up faster than the 55 turn would, if at all.

[@RCexplained]

Watch this video if you have time and let me know what you think. kzbin.info/www/bejne/p5y2gZ2Eot2WopY

[@moehanzick7506]

Hi RC Pros. Im a rookie at this ha ha ha I need some real help hahaha Here it goes I have Brushless Traxxas Rustler i bought brand new. The original Traxxas 3350R Velineon VXL-3s Waterproof Brushless Power System burned on me in a week after i did the speed gearing 31/76. Now i have a Hobbywing 2600kv with the hobbywing max10 esc and running a 4s Traxxas 6700mah lipo. with gearing of a 76 tooth haha i dont know what my pinion is. I want go faster. What gearing should i use on the hobbywing 2600 or motor. Thanks reply asap haha

[@imRedrich]

is the higher the kv the torque is lowwer?

[@colin1992]

Great vid ryan. When i had my infraction, i spent too much money on motors, and an esc’s, why? I wanted to hit 100, when in reality a simple gear change spur and pinion, could do the trick. I stuck with a castle 2200, and had a mamba monster x 8s

[@RCexplained]

Thanks for the comment Colin. Good point and that's a sweet setup you stuck with.

[@colin1992]

@@RCexplained but, as i recall, my castle 2200 died from overheating, so i replaced it with a 1515 1650kv motor

[@POLITICALYCORRECTify]

@@colin1992 Of course it died you cant use 8s with a 2200, and the motor you replaced it with is a 1717, which is lower kv but can push a way bigger gear.

[@gehandx]

I have put a 540 motor with 2000 kv and 4000 kv to a car without chaging any other thinngs. But the speed is not exactly doubled . Whats the math behind this

[@dr0n3droid]

KV rating is based on 'no load' conditions. The speed of the motor will double when not connected to anything. Once a load is introduced, things change. The higher torque required to spin the entire drivetrain reduces it's ability to reach, in your case, "double", without enormous current draw.

[@LawrenceTimme]

It's very likely it's over geared and that the higher kv motor doesn't do it's rated kv.

[@gehandx]

@@dr0n3droid thanks for the information

[@gehandx]

@@LawrenceTimme thanks for the reply

[@dr0n3droid]

@@LawrenceTimme Please explain.

[@ChiefRickyRC]

And everyone make sure to lube your RC's! The #1 best way to have cooler running temps!

[@TheTylerjoy04]

Question, Which Would Have A Longer Run Time? 2200kv Or The 2650kv On Same Rc, With The Same Battery Pack & With The Same Gears & Tires..

[@RCexplained]

2200, it would be slower. Less power output = longer run time.

[@TheTylerjoy04]

@@RCexplained Ok Thanks..!🤙🏼🤙🏼

[@fernandofrancisco3106]

Which is better to used for truggy? 2650kv or 2000 kv motor

[@MyKonaRC]

2650 is fine, thats a low turn motor.

[@andynoguez9027]

I want to know if I can put 2 6s lipo’s on my zelos 48 electric 160 esc 1000kv series

[@RCexplained]

Not sure if the ESC is rated for 12s, however running an unloaded 44,400 RPM is not recommended. That would be outside the range I listed in this video for boats.

[@candiceharber2909]

My rc coming in with a 3800kv with a 40amp ESC. I'm wanting to slow it down a bit with more torque for climbing. What motor does that for me.

[@RCexplained]

Hello, how much of a speed change are you looking for? Are you able to move to the smallest motor pinion gear? This will reduce speed and increase torque effectively.

[@candiceharber2909]

@@RCexplained just getting started in RC. So I'm learning and watching as much as I can.

[@RCexplained]

That is how you will be most successful!

[@knastusse]

I have a kyosho mp9 castle 1515 motor what is the biggest pinion i can put in

[@RCexplained]

This will depend on your specific setup and where and how you are running the RC. If you are not aggressively running your RC and operating in cold temperatures your pinion can be larger. Vs operating aggressively in very hot weather. The best way to determine your answer is to try the next available gear and check temps.

[@knastusse]

@@RCexplained okey so maybe 20 pinion ?

[@nevaehhope2008]

So what’s the difference between a 28t brushed moter and a 7200 kv moter

[@RCexplained]

There could be many differences between the 2 motors. Would need more info to determine these differences

[@honza1317]

I have a question😀 I have a 1650 kv motor and I run it on 4s.. can I just gear it up to make it fast as some 2500 kv motor? And if yes, does it mean it will overheat faster? Thanks

[@RCexplained]

Yes you can gear it up, however as you do it will increase the temperatures of the motor, battery and ESC. kzbin.info/www/bejne/iGWXkmaDbtVjeKc

[@honza1317]

Will it produce same heat as the high kv motor with same speed gearing?

[@RCexplained]

It will be more heat in the motor as the lower kv motor will have a higher winding resistance.

[@jgotdawheel]

So can you gear a high kv with a taller gear then a low kv ?

[@MrApmech]

No, it’s the other way around. Lower KV = more torque and the ability to pull a taller gear.

[@stormhawk31]

How do you know the motor's maximum thermal limit?

[@RCexplained]

This is a manufactures specification. If unknown, 140F or 60C is a very conservative starting point

[@Quirnyyyy]

so whats faster? 4370kv or 3300kv??

[@Crisinator]

4370, but 3300kv u can probably use on 3s or maybe 4s. 4370, is only for 2s and maybe 4s. Also the 3300kv is going to run much cooler on the same gearing

[@MaxBrix]

If you don't have enough torque lower KV can be faster.

[@hermantaanggara1953]

Exchuseme sir do you active in your yt channel

[@isaackshirley4695]

So I got a traxxas maxx same situation the kv is 2200kv ok so I burnt that motor I ordered a new one on ebay it was 2650kv it said it was an upgraded motor so if o use it the exact way I had the 2200kv motor is it going to be faster ?

[@RCexplained]

Using a 2650kv motor in place of a 2200kv motor, will be faster but will also require a lot more power to do so. Be certain that the wattage rating is significantly higher then the 2200kv motor. If not you risk burnout. Monitor heat closely when upgrading or changing your power system.

[@isaackshirley4695]

So meaning battery dies faster motor comes hotter faster

[@isaackshirley4695]

So if o go down the teeth on my pinion it will be a little bit better and the tires so its a combination of everything to do with the drivetrain

[@isaackshirley4695]

Thank you for the response and the good info 🤙🏽

[@RCexplained]

That is correct.

[@kcmullins6179]

Yeah higher KV is higher speeds iv tried this out with my big rock granite ect hell even in my element Enduro Trail walker lol. The higher kv motor was faster I installed a large 4276 2200kv motor done my speed test with my big rock it was all tested with 3s and 4s lipos each one 80c discharge 5200mah batteries. I used multiple ESC's from a hobbywing Quicrun 10BL120 3s sensored esc than a hobbywing Max 10sct and max10 than my castle SWD3 and SW4 and the copperhead esc. Motors I used was my 4276 2200kv / 4276 2000kv / 4268 2500kv / 4268 2050kv then I used my smaller motors 3660 3300kv / 3660 3200kv / 3660 4000kv and then 3668 2200kv / 3668 3000kv. And the higher KVs I got higher top speeds but the larger motors with the lower kvs where way faster of the line and seemed faster in general bashing. Even the same kv but diff size 3660 vs 4276 "Small block vs Big block" and the big motor was better all around less heat the big motors stayed nice and cool not even hot or warm on 3s which obviously these are 6s 8s motors but ran perfectly on 3s and was getting good speeds. The gearing was and is 57T mod 8 integy spur and a Mod 8 20T pinion from integy and with the lower motors I dropped pinion size down to 15 and 16 because 20T seemed to much on em even the lower KVs couldn't handle it in the 3660s and 3668s the large 4276 and 4268 big blocks done it perfectly. Which I have prob 80 to 90 brushless motors alot of em most of em anyway are still in the box never opened they are backups and I do resale em and give em away to friends ect that wanna upgrade or just simply need a new motor and don't wanna rebuild which I rebuild my motors for the most part even my sealed can brushed motors. I got this crazy modified brushed motor I built from two diff motors and it's awesome even tho it's a brushed motor itll get up n go lol

[@psychtrope]

hello, excuse my english, so what is for you the best motor for big rock... in size, in kv, endurance and which regulator with... thanks in advance

[@nasalsweets9110]

torque is what you need to chase, not rpm/kv. I can put a 3600 kv motor on car and it could crawl if it does not produce sufficient torque, vs an 800 kv motor geared for speed and it will run because it has enough torque to reach its highest rpm under load. Car manufactures will tell you all about how much horsepower their cars can produce, but who cares to ask about the max rpm of the engine???

[@yodad4776]

I would like to point out a slight error U have which is still quite variable ..the vehicle weight ..if U have higher kVa and higher rpm U have less tourqe ..if U have a large heavy RC car your going to decrease take off speeds by increasing rpm operation aka speed.. ..if U truly want to go faster go smaller in kV bigger in physical size and up the current to 2-3x your existing supply ..then mess with the gearing and U will increase takeoff AND top speed

[@allmightygreatone1048]

The 2200 kv is rated 6 s. The 2600 is rated 4 s max.

[@BOBBEATS504]

i need help bro

[@RCexplained]

With?

[@dhhucker]

KV down volt up baby! 2200kv 6s>2650kv 4s

[@dr0n3droid]

4:18 When you say "increasing kv" are you suggesting rewinding the motor? I feel as though this video could have been an hour longer and would still not cover this topic. By changing can size you're really not comparing different kv.

[@dr0n3droid]

Should have titled "Does a larger motor increase speed?"

[@dr0n3droid]

Or "Does a higher voltage increase speed?"

[@lowridr2]

Dude he simply mentioned that the higher kv can be a smaller can but it’s voltage potential is smaller compared to a larger can listen to what he saying instead of skipping to half the video and leaving a dumb comment without any other context clues to what he is saying and then responding twice to your own comment 😂😂😂

[@dr0n3droid]

@@lowridr2 I watched the video 4 times to ensure I didn't miss anything before leaving a comment. As someone who has studied motor theory, I understand that it is a complicated topic and there is no way so summarize in

[@dr0n3droid]

@@lowridr2 Dude.

[@GyuHobbyRC]

I watched the funny and informative video well. You have a good hobby, friend. !!!! let's be friends.😊😊😊😊 친하게 지내봐요~~

[@remkojerphanion4686]

It's a good video, but funny?

[@kevinjhonson5925]

Ugggggg I’m old school I’ll stick with modified brushed motors it was so much simpler