Brushless Motors – Turns Vs. Kv Rating

Brushless Motors  – Turns Vs. Kv Rating

In recent days I have come into the situation where I need a new brushless system for my Traxxas Slash RaceSpec. It had a Castle Creations Mamba Max 7,700Kv system.

It’s well over 3 years old, and gave out on me last weekend at the track. I know that this can be a devastating blow for any racer. Next to the RC rig itself, the next biggest expense is the motor and speed control. Yeah ok, the Radio too. But I’m talking power plant here.

With so many choices out there, and different ways to measure the rating of these motors, you can find yourself going bug-eyed and want to hit your head on the desk out of confusion and frustration. I myself was wondering, if I were to get a different setup, what would I get. Do I want to keep top speed, or get more torque. How do I tell the difference between the two??  Turns, KV. I’m not alone.

I realized with my research with these  3 different brushless setups I wasn’t alone in the common question of “What does this motor in KV translate to a motors Turn????

Here is a chart that I made based on hours of research and best accurate information from the manufactures. Here is what I am looking at.


RC Car Action - RC Cars & Trucks | Brushless Motors  – Turns Vs. Kv Rating

*This chart does NOT indicated the  motor limits or types of motors the ESC can handle, this is a reference chart of comparing between two methods of units of measure. (Data collected based on a 7.2v system setup)


-Associated LRP Vector X-11 10.5 Turn Censored Brushless Motor and Ai Pro Brushless Electronic Speed Control Combo.
Part# LRP80585

– Novak Havoc 8.5T Sport Brushless Censored ESC and Motor System.
Part# 3038

– DuraTrax 3900kV Brushless Power System.
Part # DTXC3122

-Castle Creations 7,700Kv Brushless System
Part# 010-0066-04

According to the chart with best accuracy comparing the 3 types, and rating system. I found the DuraTrax system (built based on Castle Creations system) was a close comparable to the LRP Vector system. Minus the fact DuraTrax is not a censored system.  The only extreme is the Mamba 7,700Kv system.  Keep in mind, I did compare more less the 1/10-scale off-road truck type systems/SCT. Other systems may not use this type of chart. The reason I wanted a little reference chart like this is so When I read about a turn, and then a KV rating. I can see where the correlation is between them. I also can better judge the price.
I know there are a lot of determining factors when it comes to the Turns of a motor, and why. Also the KV rating of motor isn’t always everything, and you get what you pay for. I know there are good budget systems out there, i’d like to think I focused on a couple of them here.
With a little understanding on where each system sits and on what scale to one another, you can determine yourself what your up against when looking at systems across the board. With in reason of course.  It doesn’t have to be the systems I chose here to look at. With so many other people asking the same such questions as “If I have a 3500Kv motor, how many turns would it be close to??”

Now you know.




Never miss an issue of RC Car Action!

Subscribe today with a Digital Edition subscription or Print + Digital combo!


Updated: July 20, 2015 — 2:33 PM
Air Age Media ©