GT4 in the sim: the class that teaches racecraft

GT4 is the class below GT3: production-based race cars with less power and much less downforce. In a simulator that makes it a useful class for learning racecraft, because the cars punish rough inputs without the pace and aero sensitivity of GT3. This article looks at what the class teaches, which simulators carry it and how to set the cars up.

Several things make GT4 a sensible class to spend time in.

Between road car and GT3

GT3 cars produce far more power and downforce than GT4 cars. They demand precise throttle control and an understanding of their aerodynamics, and while they reward that work, they can be hard going for newcomers.

GT4 cars are fast enough to feel like race cars, with plenty of power and responsive handling. However, they generally lack the extreme downforce and ultra-stiff suspension of GT3 machines. This means they’re more forgiving of minor errors, allow for a wider range of driving styles, and are generally easier to get up to speed with. You can push them hard, have fun doing it, and still achieve respectable lap times without needing years of dedicated practice.

Balancing Speed and Driveability

That balance is the point of the class. You still get the visceral feeling of acceleration, the satisfying grip through corners, and the thrill of racing wheel-to-wheel. But the cars are less prone to sudden snap oversteers or unforgiving aerodynamic stalls. This makes them more approachable, allowing drivers to focus on racing lines, braking points, and out-driving their opponents rather than constantly fighting the car itself.

A Gateway to More Complex Racing

For many sim racers, the GT4 category serves as an excellent stepping stone. Once you’ve gotten a handle on GT4 cars, the transition to GT3 becomes much smoother. The foundational principles of race craft, weight transfer, and tire management are all learned and honed in GT4, making the leap to more powerful and complex machinery feel less like starting from scratch and more like an evolution of your skills.

The Appeal of Specific GT4 Content in Popular Sims

The quality and variety of GT4 car models available within popular sim racing titles are crucial to their success.

Accuracy and licensing

When developers work with manufacturers and real-world data, a car model can be accurate in how the car drives as well as how it looks: tyre behaviour, suspension kinematics and engine characteristics. That is what makes a licensed GT4 car feel close to the real one.

Grid variety

A strong GT4 offering in a sim means having a diverse grid of cars. This isn’t just about aesthetics; different GT4 cars have subtle but distinct driving characteristics. Some might be more focused on straight-line speed, while others excel in mechanical grip through slower corners. This variety allows for different strategies and can even lead to different cars being favored by different drivers, adding a rich strategic layer to online races.

Popular Sim Titles and Their GT4 Offerings

Assetto Corsa Competizione (ACC): GT4 came to ACC with the GT4 Pack, a paid DLC released in July 2020, so it is not part of the base game. The pack adds eleven cars reproduced from the SRO GT4 European Series, among them the Alpine A110 GT4, Aston Martin Vantage GT4, Audi R8 LMS GT4, BMW M4 GT4, McLaren 570S GT4, Mercedes AMG GT4 and Porsche 718 Cayman GT4 Clubsport, and a GT4 season in Championship Mode. The laser-scanned tracks make it a good place to learn the class; see our ACC getting started guide.

iRacing: GT4 cars in iRacing include the Aston Martin Vantage GT4, BMW M4 GT4, Ford Mustang GT4, McLaren 570S GT4, Mercedes-AMG GT4 and Porsche 718 Cayman GT4 Clubsport MR, which together made up the GT4 class of the 2026 iRacing Creventic Endurance Series. Races are split by rating, so you usually meet drivers of a similar level; the system is explained in safety and skill ratings, the costs in what iRacing really costs.

Automobilista 2: This sim, powered by the Madness engine, added a GT4 class in update 1.0.5.0 in October 2020 with the 2018 McLaren 570S GT4, the 2017 Camaro GT4-R and the 2016 Porsche Cayman GT4 Clubsport. The track list mixes real-world and fictional circuits. More in Automobilista 2 strengths and weaknesses.

rFactor 2: Known for its tyre model and force feedback, rFactor 2 is a rawer and more physically demanding simulation. Its GT4 field depends on the official content and third-party mods you install, so check what is currently available before buying it for GT4. Once you have a good car, it demands a real understanding of tyre wear and setup. See rFactor 2 in 2026.

Mastering the GT4 Driving Technique

While GT4 cars are more forgiving than GT3, they still demand a trained hand and a strategic approach to extract their full potential.

Smoothness is Key

The mantra of sim racing, especially with GT4 cars, is smoothness. This applies to every aspect of your driving:

Throttle Control: Avoid abrupt on/off throttle inputs. Gradually apply power on corner exit to prevent the rear tires from breaking traction. Trail braking into corners can also help keep the weight on the front tires, aiding turn-in.
Braking: Brake in a straight line as much as possible. Applying brakes while turning can unsettle the car, particularly in GT4 cars where aerodynamic grip isn’t as extreme as in GT3. Feathering the brakes as you turn in can also help manage weight transfer.
Steering: Make smooth, progressive steering inputs. Jerky steering movements can upset the car’s balance and lead to slides or understeer. Think of it as guiding the car rather than yanking it around.

Understanding Weight Transfer

GT4 cars, like all race cars, are heavily influenced by weight transfer. This is the principle of how the car’s mass shifts under acceleration, braking, and cornering.

Braking: When you brake, weight shifts forward onto the front tires, increasing their grip. This allows you to brake harder and turn in more effectively.
Acceleration: When you accelerate, weight shifts backward onto the rear tires. This is where you want to apply power, but too much too soon can break traction.
Cornering: During cornering, weight transfers to the outside tires. Understanding how this shift affects grip is crucial. You want to maintain a balanced load across all four tires as much as possible to maximize grip.

Managing Tire Wear and Temperature

Even in shorter GT4 races, tire management is important. Pushing too hard through every corner will quickly degrade your tires, leading to a loss of grip and slower lap times.

Lap-by-Lap Aggression: You can’t attack every single corner on every single lap. Learn to manage your pace, especially in the middle of a stint. Save your aggression for overtakes or when you have clear track ahead.
Temperature Differences: In some sims, tire temperatures are simulated. Overheating your tires by sliding too much or braking too hard will reduce their grip significantly. Conversely, tires that are too cold won’t offer optimal performance. Finding that sweet spot is key.

Wheel-to-wheel GT4 racing

Much of the appeal of GT4 lies in wheel-to-wheel racing, where individual pace decides less than racecraft.

Close Racing and Overtaking Opportunities

The balanced performance and slightly less extreme downforce of GT4 cars often lead to close racing. Unlike GT3, where aerodynamic dirty air can be a significant challenge, GT4 cars tend to follow each other more effectively. This means you’re more likely to be battling nose-to-tail for entire laps, with ample opportunities for overtakes into braking zones or through faster corners.

The Importance of Race Craft

In GT4 racing, raw speed alone isn’t enough. You need to master race craft:

Defensive Driving: Learning to position your car to block an overtake without compromising your own exit speed is a crucial skill.
Offensive Driving: Timing your overtakes, using subtle feints, and capitalizing on your opponent’s mistakes are all part of the game.
Awareness: Always being aware of your surroundings, including other cars and potential hazards, is paramount for survival and success.

Variety of Online Competition

The popularity of GT4 means you’ll find a wide range of online competition, from casual leagues to highly competitive ranked races. This ensures there’s always a race to join, regardless of your skill level or preferred time zone. Practical advice on racing cleanly is in overtaking without collecting penalties.

Setting Up for Success with GT4 Cars

While GT4 cars are more accessible, a proper setup can still make a significant difference in performance and driver comfort. This isn’t about creating a hyper-specific, ultra-technical setup like you might need for a GT3 car, but about making intelligent adjustments.

Basic Setup Considerations

Tyre pressures: Often the first and most effective adjustment. The aim is the hot pressure window the tyre model rewards: too high and the contact patch shrinks and grip drops, too low and the tyre overheats and feels vague. Judge the hot pressures after a few laps, not the cold starting values. See tyre pressure in the sim.
Springs and Dampers: Softer springs and dampers will generally make the car more compliant and forgiving, absorbing bumps and irregularities. Stiffer settings will improve responsiveness and reduce body roll but can make the car more nervous and prone to oversteer. For GT4, leaning towards a slightly softer setup can often be beneficial for confidence.
Anti-Roll Bars (ARBs): ARBs control how the car’s body rolls in corners. Increasing stiffness on one end will reduce roll on that end, typically leading to more understeer if stiffened at the front, or more oversteer if stiffened at the rear. Balance is key here.
Gear ratios: Not every simulator lets you change them on GT4 cars. Where it does, a taller top gear suits tracks with long straights and shorter ratios suit twisty tracks, so the engine stays in its power band.

The Role of Force Feedback

Your steering wheel’s force feedback (FFB) is your primary connection to the virtual car. For GT4 cars, it’s about communicating the subtle nuances of grip and balance.

Feeling the Tires: Good FFB will allow you to feel when the front tires are about to lose grip (understeer) or when the rear is starting to slide. This is often communicated through changes in resistance and vibration.
Weight Transfer: You should be able to feel the weight shifting as you brake, accelerate, and turn. This feedback is crucial for anticipating the car’s behavior.
Track Surface: Experienced sim racers can often feel the texture of the track surface through their FFB, which adds another layer of immersion and realism.

Tuning for Different Tracks

A setup that works perfectly at one track might not be ideal at another.

High-speed tracks: Tracks like Spa or Monza favour less rear wing where the car allows it and, where possible, taller gearing for top speed.
Technical Tracks: Tracks like Brands Hatch or Laguna Seca will require a setup that emphasizes mechanical grip, with a focus on suspension and damper settings to handle the constant changes in direction.
Bumpy Tracks: If a track is known for being bumpy, a softer suspension setup will be essential to maintain control and prevent the car from becoming unsettled.

What makes GT4 stand out

A good car model is only part of it. What makes GT4 worth the time is the class as a whole.

Accessibility Meets Depth

The core reason GT4 shines is its ability to offer a deep and rewarding simulation experience without an incredibly steep learning curve. You can jump into a GT4 car, learn its basic handling characteristics relatively quickly, and start having fun racing online. Yet, for those who want to dig deeper, there’s always more to uncover: mastering advanced driving techniques, optimizing car setups, and refining race craft.

Realism without constant drama

GT4 cars walk a fine line. They provide enough power and performance to feel genuinely exciting and challenging, but they retain a level of predictability and manageability that makes them a joy to drive. You’re not constantly on the edge of disaster, which allows you to focus on the thrill of the competition and the art of driving. This makes for a more consistently enjoyable experience, especially in longer races or online events.

Leagues and online series

GT4 is raced in public online series and in leagues, where you can learn from other drivers and measure your progress. How to find and join one is covered in joining your first league.

A True Test of Driving Skill

While more forgiving than GT3, mastering GT4 racing still requires a significant amount of skill. The finer points of throttle control, braking technique, weight transfer, and tire management are all critical for shaving off those tenths of a second and for battling wheel-to-wheel. It’s a category that rewards dedication and intelligent driving, providing a satisfying progression path for sim racers looking to improve.

Why it works

GT4 is neither the simplest nor the most complex class, neither the slowest nor the fastest. That balance of performance, accessibility and close competition is why many sim racers stay in it, and the skills carry straight over to GT3 cars later.

FAQs

What are GT4 cars in sim racing?

GT4 cars in sim racing are a class of cars that are based on production models and are designed to be more accessible and affordable than higher-level GT3 cars. They are often used in multi-class racing events and are popular choices for amateur and semi-professional racers.

What are some popular GT4 cars in sim racing?

Some popular GT4 cars in sim racing include the Porsche Cayman GT4, BMW M4 GT4, Aston Martin Vantage GT4, and the Chevrolet Camaro GT4. These cars are known for their balance of performance, handling, and competitiveness in GT4 racing events.

How do GT4 cars differ from GT3 cars in sim racing?

GT4 cars in sim racing are typically less powerful and have less advanced aerodynamics compared to GT3 cars. They are also designed to be more cost-effective and easier to drive, making them a popular choice for sim racers looking for a more accessible racing experience.

What sim racing platforms feature GT4 cars?

iRacing, Assetto Corsa Competizione (with the GT4 Pack DLC) and Automobilista 2 all include GT4 cars. In rFactor 2 the GT4 field depends on the official content and mods you install.

What are some key considerations when racing GT4 cars in sim racing?

When racing GT4 cars in sim racing, it’s important to consider factors such as tire management, fuel consumption, and race strategy. Additionally, understanding the specific handling characteristics of each GT4 car and practicing consistent driving techniques are crucial for success in GT4 racing events.