If you’re don’t have an RC store in your area, take a look at specialty suppliers online. Brushless motors may also be rated by “motor velocity constant” (Kv)—the higher the number, the more powerful the motor. [2] X Research source
Place the screws in a dish or small baggie nearby so you don’t lose them. Higher-end models often have open designs that allow you to see each of the car’s mechanical parts. On this type of car, you may only need to remove the small gear cover enclosing the motor compartment. [3] X Research source
Examine the internal layout of the car closely so you’ll be able to reassemble each component in the correct order. Some inexpensive models have two separate motors, one that turns the front wheels left and right and a larger one in the rear that actually powers the car. These types of motors are not meant to be modified, and may not be replaceable.
Hold onto the old motor for now. You can use it as a backup in case there’s a problem with the new one.
The power wires are color-coordinated, so be sure to match each connector with the color indicated on the port. If the model you’re running features dual motors for more complex controls, make sure you replace both of them so they’ll have an even amount of torque.
RC cars have been known to attain speeds of up to 100 mph (160 km/h) with cranked-up batteries. You can potentially add 15–20 mph (24. 1–32. 2 km/h) to your car’s top speed by upgrading the battery, even without making any other modifications. [7] X Research source To ensure that you get the right fit, measure your car’s battery compartment and buy a battery of the appropriate size.
If your car feels unusually hot after a session, it may mean that the upgraded battery is placing too much strain on the motor. In this situation, it’s safest to just move down a size, since you won’t be able to effectively make use of the extra power anyway. Using a battery that’s too powerful for your car could cause permanent damage to the motor or ESC. [9] X Research source
If you decide to keep your old battery, perform a before-and-after test run alongside the new one. You’ll most likely be surprised by the difference the sleeker, higher-output battery makes. Make sure you take your old batteries to the proper waste disposal or recycling site when it’s time to get rid of them. Never throw rechargeable batteries in the trash. [10] X Research source
Test the battery’s fit to make sure there are no loose connections or unnecessary movement in the pack itself.
Make sure your RC car’s battery is fully charged before you take it out for a practice session or race. [11] X Research source If possible, pick up an extra battery or two so you’ll always have a spare on hand.
If you’re more focused on improving your car’s acceleration than maxing out its top speed, go with a smaller pinion and a larger spur. You’ll be sacrificing a little bit of velocity, but you’ll make up for it with more precise cornering and cooler running temperatures. Changing the size of the gears is one of the simplest and least expensive ways you get your car running faster.
Most consumer-grade RC cars are outfitted with cheap brass bushings that turn the wheel on the axle. These bushings aren’t designed for high-output performance, and can slow your car down drastically. [14] X Research source The ball bearings are able to spin more freely than bushings. This eliminates drag, which can reduce engine strain, and increase battery life.
Full spikes will offer more traction on uneven surfaces like mud and damp grass. [16] X Research source Mini pins perform well on carpet, turf, and other uneven terrain. Bald, slick treads and softer tire types are the best choice for hard, smooth paths like paved roads. If you’re looking for a good all-around tread, try mini spikes. They strike a balance between speed, grip, and maneuverability.
If you’re skilled with a rotary tool, use it to cut off unnecessary plastic sections of the chassis and surrounding body, like the bulky area around the battery socket or the speed control tray. [18] X Research source Trimming the majority of the bulk from the front end of the car can also help make it more aerodynamic (and also make it less likely to flip over when stopping at high speeds).
