Brushless motors, winding lead wire fixed to the outer casing thereof and in the innermost part, are fixed to the shaft magnets. These engines require a specific drive for them, not serving the drive of a Brushed motor. They are easy to recognize by 3 wires out of the engine to the drive. They are governed by the parameter kV, which reports the number of revolutions per minute turns per volt motor that feeds you, must take into account that the more kV has a motor, will be faster, but will have less torque. You need to keep this part of the car always clean and avoid direct humidities.