Illustration: RC buggy on a dirt track – SwellRC guide to RC cars

RC Cars: How to Choose, Run and Maintain a Radio-Controlled Car

RC Cars

RC cars range from palm-sized drifters to petrol-powered 1/5 scale buggies that weigh as much as a small dog. This guide sorts out scales, power types and vehicle styles, explains what “RTR” and “2.4 GHz” mean in practice, and shows how to keep a car running for years instead of weeks.

Kyle HilsonBy Kyle HilsonUpdated: October 202614 min read

Illustration: RC buggy on a dirt track – SwellRC guide to RC cars

Vehicle types

The first decision is not the brand or the speed, it is where you will drive. Each vehicle type is built for one kind of surface, and a car used outside its element is slow at best and broken at worst.

Type Built for Strengths Watch out for
Monster truck Grass, gravel, jumps Huge tyres, very tough, drives almost anywhere Rolls over in fast turns
Short course truck Dirt tracks, parks Realistic look, bumpers protect the wheels Heavier body, more parts to break in crashes
Buggy Dirt and off-road tracks Agile, fast, the classic racing class Low ground clearance in long grass
Truggy Rough tracks, bashing Buggy handling with truck-size tyres Wider, needs more room
Rock crawler Rocks, trails, gardens Slow, precise, long battery life Not built for speed
On-road / touring Asphalt, carpet tracks Very fast, precise handling Useless on grass or gravel
Drift car Smooth floors, drift tracks Controlled slides, scale bodies Hard plastic tyres grip almost nothing

If you are not sure, a 4WD short course truck or monster truck is the most forgiving starting point. It drives on grass, gravel and pavement and survives the crashes every beginner has.

Scale and size

Scale is the ratio between the model and a full-size vehicle. A 1/10 car is one-tenth the size of the real thing. Scale is only a rough guide, because a 1/10 monster truck is much bigger than a 1/10 touring car, but it tells you which class and which parts a car belongs to.

  • 1/24 to 1/18: indoor and garden cars, around 15–25 cm long. Cheap and fun, but small wheels stop in grass.
  • 1/10: the most popular hobby scale, around 40–55 cm long. The widest choice of cars, parts and tracks.
  • 1/8: bigger buggies and truggies for rough tracks, often nitro or powerful brushless.
  • 1/5 and 1/6: large-scale cars around 80–100 cm long, usually petrol two-stroke or big 8S electric systems.

Our article on how big a 1/18 scale RC car is shows real dimensions for the smaller classes.

Electric, nitro or gas

Electric power is the default today. A brushless motor and a LiPo battery give more speed than most nitro cars, start instantly and need almost no tuning. Nitro and petrol cars are a different experience: noise, smell, fuel and an engine to tune. Some people love that; others find it gets in the way of driving.

Brushed electric Brushless electric Nitro (glow) Gas (petrol)
Typical use Toys, entry cars, crawlers Most hobby cars 1/10 and 1/8 racing, bashing 1/5 scale cars
Run time Per battery Per battery Per tank, refuel in seconds Long, refuel in seconds
Maintenance Low Low High: tuning, glow plugs, after-run oil Medium: air filter, two-stroke mix
Noise Quiet Quiet Loud Loud

Nitro engines run on a mix of methanol, nitromethane and oil, ignited by a heated glow plug. They need a break-in period and careful needle tuning; our guides to tuning a nitro engine and nitro fuel explain both. For the motor and battery side, see the batteries, motors and ESC guide.

Hobby grade or toy grade

A toy-grade car from a supermarket and a hobby-grade car can look similar in photos. The difference shows the first time something breaks.

  • Parts: hobby-grade cars have every part available as a spare and often as an upgrade. Toy-grade cars are usually thrown away when one gear strips.
  • Electronics: hobby-grade cars use a separate receiver, ESC and steering servo you can replace. Toy cars combine everything on one board.
  • Proportional control: hobby-grade throttle and steering are proportional, so half a trigger pull gives half speed. Many toys only know “on” and “off”.
  • Batteries: hobby cars use standard packs with standard plugs, so one charger serves several cars.

Toy-grade cars are fine as gifts for small children. Anyone older than about ten who will drive it more than a few times is better served by an entry-level hobby-grade RTR car, which often costs only a little more.

Radio, binding and setup

Modern cars use 2.4 GHz radios. The transmitter and receiver are “bound” to each other, so dozens of cars can drive at the same track without interference. Older cars used crystal frequencies such as 27 MHz, where two cars on the same channel would fight each other; our article on what 27 MHz means explains that system.

The basic setup checklist

  1. Transmitter on first, then the car. Off in reverse order: car first, then transmitter.
  2. Check that steering goes the right way and centres when you let go; adjust steering trim if the car pulls to one side.
  3. Set the throttle neutral on the ESC (calibration), so the car doesn’t creep when you are not touching the trigger.
  4. Set the fail-safe so the car stops if it loses signal.
  5. Use dual rate or steering end points to stop the servo pushing against its limits.

If a car does not respond at all, binding is the usual fix. Step-by-step guides: pairing a remote with an RC car, linking a Traxxas TQ radio and what a blinking red Traxxas ESC means.

Large scale: 1/5 gas cars

1/5 scale cars are their own world. They run on two-stroke petrol engines mixed with two-stroke oil, use pull starters, weigh well over 10 kg and need open space. The HPI Baja 5B defined the class, and compatible models such as the King Motor Baja 5B share much of its layout and many parts.

From the workbench: I own a King Motor Baja 5B. Large-scale cars are heavier in every sense: crashes load parts that rarely fail on a 1/10 car, a loose screw can cost a wheel, and the engine pulls dust through the air filter all day. Check the screws before every session and clean the air filter afterwards.

  • Space: you need a large empty field, gravel pit or track. These cars are too fast and heavy for parks with people.
  • Fuel mix: use the ratio of petrol to two-stroke oil that the engine maker gives, and mix fresh fuel; old mix starts poorly.
  • Air filter: clean and re-oil it often. Dust that gets past the filter wears the piston and cylinder.
  • Noise: fit a quieter exhaust if you drive near houses; neighbours notice a two-stroke at full throttle.

More in our articles on the Baja 5B and 1/5 scale RC cars.

Maintenance that matters

Most broken RC cars are not worn out, they are neglected. Ten minutes after each session keeps a car reliable.

  • Clean it: brush or blow off dirt; don’t hose electronics. Dirt in bearings and gears is what wears them out.
  • Check screws: wheel nuts, motor mount and servo saver come loose first.
  • Gear mesh: the pinion and spur gear need a tiny gap. Too tight overheats the motor, too loose strips the spur.
  • Bearings: a gritty or noisy wheel usually means a dead bearing; replace it before it ruins the hub.
  • Shocks: leaking shock oil makes the car bounce; rebuild them with fresh oil of the right weight.
  • Batteries: never store LiPos full or empty; use the storage function of your charger.

If the car cuts out while driving, the cause is usually a low battery, an overheated ESC or a loose plug. Our article on why an RC car keeps cutting out goes through each.

Where to drive

Empty car parks, skate parks outside opening hours and your own garden work for small cars. For anything fast, find a track or a club: they have prepared surfaces, timing systems and people to learn from. Check local rules before driving in public parks, keep away from people, dogs and traffic, and never drive on public roads. Our article on finding an RC car club near you explains where to look.

FAQ

What is the best RC car for a beginner?

A 4WD ready-to-run 1/10 short course truck or monster truck with a brushless or good brushed system. It drives on most surfaces, survives crashes, and has spare parts available. Avoid the fastest model in the range for your first car; speed is easy to add later.

How fast can an RC car go?

Toy cars do 10–20 km/h, entry hobby cars 30–50 km/h, and fast brushless cars on 4S–6S LiPo 80–100 km/h and more. Speed records are set with specially built cars; the cars you can buy ready to run are slower, and speed claims on boxes are often optimistic.

Can I use a different remote for my RC car?

Yes, if the car has a separate receiver: buy a transmitter with a matching receiver, plug the receiver into the ESC and servo, and bind them. Toy-grade cars with all-in-one boards usually can’t be changed. See our article on using a different remote.

Are RC cars waterproof?

Many hobby cars are “water resistant”: they survive puddles and wet grass. That is not the same as being able to drive through water. Dry the car afterwards, and remove and dry the motor bearings if they got wet, or they will rust.

Is nitro better than electric?

Not faster, and more work. Nitro is better if you want engine sound, quick refuelling and the craft of tuning an engine. If you just want to drive, electric brushless is simpler and usually quicker.

All 108 articles in this guide

Every article below goes deeper into one question from this guide. Open a group to see its articles.

Buying and choosing 15
Nitro, gas and 1/5 scale 14
Building and DIY projects 13
Radios, electronics and setup 27
Repairs and maintenance 4
Models, brands and records 35

Kyle Hilson, author of SwellRC

About the author: Kyle Hilson

About 20 years in RC. Mostly boats in the NAVIGA Mini Eco Expert class, with many self-made parts; also a King Motor Baja 5B, a home-built electric plane, home-built nitro planes he has flown, and an RC helicopter. More about SwellRC

More SwellRC guides

Batteries, motors and radiosLiPo care, brushless motors, ESCs and binding.
RC boatsHulls, power, building and running on the water.
RC airplanesChoosing, building and learning to fly.