RC Car Action

Set Your Radio


First off, you’re going to want to adjust the settings on your radio. The most important is End-point Adjustment, or EPA for short. EPA is what controls the steering servo’s stopping points from left to right. This is the most important setting because when EPA is adjusted too low your car will have less steering than it should, reducing performanc­e. When EPA is set too high, it can cause physical damage to your RC car by putting too much stress on the steering components. Usually this ends up in a stripped servo horn, but it can be worse, so it’s best to dial in your EPA right away.

To adjust EPA, simply turn the knob on the radio marked as EPA, also sometimes marked as Steering Travel. A good method to adjust to the proper EPA setting is to first turn it down slightly, then turn the radio steering wheel to full lock either left or right.

Slowly increase the EPA until the physical steering on your RC vehicle can no longer move. If you notice the wheels no longer move but the chassis starts to flex, turn the EPA down until the chassis relaxes. Once the wheels engage full lock both left and right with no noticeable binding of parts or excessive chassis flex, you’re all set.

Another important radio setting to adjust is steering trim. Steering trim adjusts the left-to-right alignment of the wheels, which directly affects how straight the car will go with no steering input. To adjust steering trim, use the steering trim knob or switch on the radio. Use a flat surface and either straight track lines, the curb, or any other relatively straight guide as reference.

Slowly drive your car forward without turning the wheels. If the car starts to naturally shift left, then turn the knob / hit the switch to the right. If it goes right, then adjust the radio to the left. Do this in small increments, either a small turn of the knob or 1 or 2 clicks of the button, until the car tracks straight.

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