Category Archives: How-to articles

What is the right Castle Sensored 1406 motor and Max Power for your vehicle?

During the initial track-tests of the Castle 1406 Sensored motors,  Castle engineers quickly realized that these motors were much faster and provided more torque than was expected by a typical racer. Repeated testing showed that decreasing the ‘max power setting’ resulted in a ‘feel’ that closely matched existing ROAR-style 2-pole motors used in modified racing. Further lab testing using a dynamometer (dyno) compared several standard 2-pole, ROAR-style motors under load to the new Sensored 1406 series motors. This data was then verified by a professional racer to ensure the ‘feel’ was correct. These tests produced the following chart to help you pick the right Castle Sensored 1406 motor and max power for your vehicle.

ROAR-style 2-pole motors produce different speeds for a given turn-count depending on the manufacturer and series. This testing averaged data from several top manufacturers’ motors with the same gearing to create a baseline. Modification to the suggested max power below or to the gearing may be necessary to fit your personal preference.


Adjusting the ‘Max Power’ percentage allowed by the ESC, as shown in the table, will result in a setup with around the same top-speed as the desired ROAR-style 2-pole motor. You will experience the ‘feel’ you are used to while still enjoying the efficiency and performance you expect from a Castle motor. For higher efficiencies and lower motor temperatures, choose the lowest Castle 1406 Sensored Kv that fits your application. More information about the efficiency advantage of Castle Sensored 1406 motors please check here:

This is not a motor timing adjustment or a boost mode, this is simply the ESC limiting the maximum amount of throttle to the motor. In other words, if you want our 1406-4600Kv to feel like a 9.5T motor, this would be the same as limiting yourself to only pulling the trigger three-quarters of the way (74% to be exact). For even greater flexibility, you can set an input on your transmitter to adjust max power, allowing you to essentially ‘motor-up’ or ‘motor-down’ mid-race without having to change your motor.

To limit the max power percentage, use one of the following methods:

  1. Use the AUX wire with your Castle X-Series Controller, and assign the ‘Auxiliary Wire Mode’ to ‘Max Throttle Adjustment’ in Castle Link.
  2. Use Castle Link to set the ‘Max Forward Power’ setting in the ‘Power’ tab.


Big Squid RC’s “mini-review” of Castle’s Polarized Connectors

The gang at Big Squid RC – and specifically, Iron Mike, the self-proclaimed “connoisseur of the destruction of rc cars” – recently installed some of our innovative Castle Polarized Connectors and completed a “mini-review” of them. What did they think? Here are couple nuggets we pulled out.

“The Castle connectors are no joke for power handling.”

“Some connectors can’t quite handle the high current demands of 8th scale applications, while others can, but wear out too quickly. We found the Castle 6.5mm connectors easily handled the current demands of 8th scale monster trucks while showing very little wear after a couple months of use.”Big_Squid_Castle_Polarized_Connector_Review2

They also showed the recommended soldering method and put the 6.5mm Castle Connectors to the test in a Thunder Tiger MT4 G3, a Durango DEX408 V2 buggy, and an ARRMA Kraton (along with a Mamba Monster 2 and 2650kV motor upgrade), and the 4.0mm units in a Pro-Line PRO-MT and a Vaterra Halix.Big_Squid_ARRMA_Kraton_Electronics_Upgrade

Zip on over to Big Squid RC to read the full mini-review of the Castle Creations Polarized Connectors or here for their step-by-step installation of the Mamba Monster 2 and 2650kV motor into their ARRMA Kraton.