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Choosing the Ideal Brushless Motor for Your RC Car: An Expert Guide


In the fascinating world of RC modeling, remote-controlled cars equipped with brushless motors stand out for their energy efficiency and increased power. Whether you are a racing enthusiast or a model building enthusiast, choosing the right brushless motor is crucial to optimize the performance of your RC car. This article will guide you through the different aspects to consider to make the perfect choice suited to your needs and preferences.

Advantages of Brushless Motors

Brushless motors offer several significant advantages over their brushed counterparts. First, they are more efficient, converting more of the electrical energy into mechanical power. This results in higher speed and better responsiveness. In addition, brushless motors have a longer lifespan and require less maintenance, thanks to the absence of brushes that wear out over time. Their design also allows for better heat dissipation , which is essential for maintaining optimal performance during races or long driving sessions.

Car Selection Criteria - When choosing a brushless RC car, several factors should be considered:

  • Performance and Power : Evaluate engine power and maximum speed to ensure top-level performance.
  • Durability and Build Quality : Look for models built with high-quality materials for better durability.
  • Customization Options : Some models offer customization and enhancement options to meet specific needs.

Choosing the Right Motor Length

Brushless motors are a key part of an RC car's performance. When choosing a motor, length is an essential criterion to take into account. There are generally two types of motors:

  1. the short ones (68 mm)
  2. the long ones (74 mm).

Long motors provide more torque and power, which is especially beneficial for demanding terrain or competitive racing. Their larger size also allows for better heat dissipation, reducing the risk of overheating during intensive use.

On the other hand, short engines are more suitable for smooth driving at low revs. They are often favored by those seeking a more moderate riding experience or for beginners who appreciate maneuverability and control. The selection of motor length therefore depends on your driving style and the intended use of your RC car.

two types of brushless motors for RC cars

Importance of KV* in Brushless Motors

The KV of a brushless motor is an important factor that determines its performance. It represents the speed at which the motor rotates for each volt applied. KV values ​​typically range from 1700 to 2700 for RC cars, providing a wide range of performance.

  • KV Low (1700) : These engines are ideal for beginners, offering ease of piloting thanks to their better handling at low revs. They are perfect for those looking to master the basics of riding without the added complexity of excessive power.

  • KV Medium (2000) : These engines offer a perfect balance between flexibility and power. They are suitable for intermediate drivers looking to improve their skills while having good control of their vehicle.

  • High KV (2250-2700) : These engines are designed for experienced drivers and competitive racing. They offer high top speed and are ideal for off-road terrain and fast tracks.

The choice of KV therefore depends on your level of experience and the type of driving you prefer. A clear understanding of the impact of KV on car performance will help you make an informed choice for your brushless motor.

* Explanations of "KV":
The "KV" of brushless motors for RC cars represents the number of revolutions per minute (RPM) the motor will make per volt at no load. This is a measure of the constant speed of the motor. In other words, a motor with a higher KV will run faster at the same voltage than a motor with a lower KV.

To give a simple example, a motor with a KV of 1000 RPM/V will rotate at 1000 revolutions per minute at a voltage of 1 volt. If the voltage increases to 2 volts, the motor will rotate at 2000 revolutions per minute, and so on.

The KV value is important because it determines how the motor reacts under different voltages and directly influences the speed and control of the RC car. A higher KV means a higher maximum speed, while a lower KV provides more control and handling, especially at low revs. The choice of KV therefore depends on the type of performance that the driver wants to obtain with his RC car.

the impact of KV values ​​on the performance of brushless motors for RC cars

Sensor Cable and Driving Performance

The sensor cable in brushless motors plays an indispensable role in the driving performance of an RC car. This cable improves the connection between the variator and the motor, resulting in smoother starting and better low-rpm response. This feature is particularly appreciated in situations where precise control and rapid response are required.

However, some riders prefer to ride without the sensor cable to benefit from more raw power at low revs. This can be advantageous in races where speed and power are more crucial than fine control. Riding sensorless provides a more direct and aggressive driving experience, which may suit certain riding styles.

This choice between using or not the sensor cable therefore depends on the personal preferences of the driver and the specific racing or driving conditions. It is important to understand how this choice can influence the driving experience in terms of progressiveness, power and control of the car.

comparison of an RC car with and without sensor cable

Tips for Choosing the Perfect Brushless Motor

Choosing the ideal brushless motor for your RC car requires careful consideration of several factors. Here are some tips to guide you in this important decision:

  1. Assess Your Skill Level : If you are a beginner, opt for a motor with a low KV for better maneuverability. More experienced pilots can choose motors with a higher KV for maximum performance.

  2. Consider Terrain Type : Long motors with more torque are better for rough terrain or racing. Short motors are better suited for smooth surfaces and low-rpm driving.

  3. Sensor Cable or Not : Determine whether you prefer smooth starting and better low-rpm response (with sensor cable) or more raw power at low rpm (without sensor cable).

  4. Motor Size and Dimensions : Make sure the motor size is compatible with your RC car. Dimensions directly influence engine power and torque.

By following these tips, you will be better equipped to choose the brushless motor that best suits your needs and riding style, allowing you to maximize your racing enjoyment and performance.


Choosing the right brushless motor for your RC car is a decision that can significantly improve your driving experience. Whether you're looking for a car for competitive racing or fun, brushless motors offer superior performance in terms of speed, power, and durability. By taking into account your experience level, terrain type, and personal riding preferences, you can select a motor that perfectly suits your needs.

an engineer working on improving a brushless motor for an RC car

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