Hello, R/CTech users. One thing has been bugging me and I've tried to find it on the web. Looks like no one generally knows how. I have two friends who know how to "remove the limit" on a brushed or brushless motor. The way I know this must be possible is I have a Velineon brushless system in my Slash 4X4 that we all know is rated at a good 10.5T. I also have a Novak Havoc PRO SC brushless system that's rated at 4.5T that can only handle at maximum a 6-cell NiMH or a 2S LiPo. That's not the only lie of it. Not only can the Havoc ESC handle a 7-cell NiMH just fine, it's left in the dust when compared to the Velineon system on a 7-cell NiMH. More evidence that I have; I have possession of a friend's modified HPI Warp brushless motor. This Warp is nothing like the Warp motor you can purchase online. He drove his Slash 2WD to a speed of 85MPH with that motor controlled by an HPI Flux Motiv ESC until the wires melted from the extreme amount of heat generated from the electricity flowing through them. He told me he "removed the limit" on the motor so it could reach that speed. I also have another friend who knows quite a bit about RC and he claimed he could remove the limit on the Novak motor.

Long story but, what do you think? What's the deal on motor modding? I can tell it's a secret of RC but not all secrets should remain confidential. This one should be revealed for the benefit of the RC hobby and community.

Manufacturers are not lying when talking about a motor limit. Truth is, ESC's have no idea what motor's being connected to them, a "motor limit" is simply a recommendation that should help the user avoid overheating their ESC's(& this applies to both brushed & brushless ESC's). As far as modding a brushless, many of them can be disassembled, & one can either rewire the stator, or simply replace it with a more powerful one(& people have been rewinding brushed motor armatures for years, same principle, fewer turns, more power). It's not really some big secret, unless a racer is doing it to a motor to be used in a specific class(like using a 13.5 stator in a 17.5 motor running in a 17.5 class, then it's simply cheating, but those who do it get found out eventually)....

The motor limit you're describing is that of the amount of turns an ESC can handle. When the amount of power the motor is requesting exceeds the amount the ESC can provide, it overheats and either shorts out, or stops if you're lucky. It sounds very strange, but my friends were describing a type of limit on the motor itself that prohibits it from reaching it's maximum RPM. I guess rewiring the stator with a wiring different from the copper wiring (possibly of a higher conductivity) will increase the flow of electricity thus increasing RPM. That is a method that would definitely take a great amount of time and know-how.

I call BS. BL motors are only limited by the load on them, and the amperage they can get. After a certain point, the bearings blow up or the windings and/or wires heat up to the point of melting solder. You can change the windings, but that's rather pointless.. unless you are very good at it, the motor will have issues, and it's lots of work.. might as well just buy a motor with fewer turns.

It's just really interesting, a 4.5T motor that's slower than a 10.5T motor on the same battery. A regular Warp motor that's much faster than any common Warp motor. Is it possible to increase the amount of amperage the motor receives or requests thus increasing RPM?

I think 4.5T is a lot faster than 10.5T motor.

What you can do to a brushless motor is increase its efficiency like balance
the rotor, install ceramic bearings, have some cooling system, center the
rotor on the stators magnetic field or play around with different diameter
rotor and timing. Also consider the ESC's transistor switching speed since
it is run in electric pulses/frequencies or drive frequencies.

What I dont get is why different motors have different Kv ratings even
though they have the same number of turns. Like Ballistic 10.5T has 4600kv,
but in other 10.5T brand motor, its just rated at 4200kv. I think manufacturers
should include torque ratings as well.

Sorry no disrespect but I am not buying it.

Is the 4.5t motor a 550 can? If so, that would explain why the 10.5t 540 motor is faster than it. They are two completely different series/size of motor.

an electric motor, AC or DC, has only mechanical limitations i.e.-bearings failing, stator or rotor delaminating/desintegrating, overheating/demagnetizing. the only limiting factor is external the motor its self, the esc, the battery, a breaker/fuse (if so equipped) etc. you should be able to see exponential mechanical work (RPM) when x energy is applied, barring any failsafes, rpm will climb until the weakest link gives up. an electric motor is only the sum of its parts, two motors with identical guts will perform the same. thats not to say that some manufacturers puff their claims and some (higher end) manufacturers will understate stats (re: 70's american muscle car manufacturers are a great example), and sometimes the dreaded "monday quality" parts are a reality, where Bob is still hungover from his weekend and maybe lets his quality control slip a bit, but is back to the top of his game come friday. just some food for thought.

And it only took you 4 yrs. to figure this out? (old post)