Differences Between GT3 and GT4 Race Cars in Sim Racing

Since these two racecar categories are two of the most used categories worldwide and massively popular in racing sims, we thought to take a closer look and line out the key differences between them in the following article.

GT3 and GT4 vehicles differ mainly in terms of performance, technology, cost, and their intended use in motorsport.

GT3 cars are significantly more powerful than GT4 cars. They typically produce between 500 and over 600 horsepower, while GT4 cars have around 400 to 500 horsepower. GT3 cars are also lighter, and combined with more advanced aerodynamic components—such as large diffusers, front splitters, and rear wings—they achieve much faster lap times. In contrast, GT4 cars are closer to their road-going versions and feature more limited aerodynamic modifications.

When it comes to technical modifications, GT3 cars are heavily altered from the base model. They use advanced racing technology, including professional-grade driving aids like ABS, traction control, and extensive telemetry systems. GT4 cars are simpler in this regard, making them easier to handle, especially for less experienced drivers.

There are also major differences in cost. A GT3 race car typically costs between €400,000 and €600,000, while a GT4 car can be purchased for around €150,000 to €250,000. Running costs—including parts, tires, and maintenance—are also much lower for GT4 cars.

In terms of competition, GT3 cars are featured in high-profile racing series such as the GT World Challenge, the 24 Hours of Nürburgring, the IMSA WeatherTech SportsCar Championship, and even Le Mans (as part of the LMGT3 class). These races involve both professional and Pro-Am drivers. GT4, on the other hand, is aimed more at amateur and semi-professional teams, and is commonly found in series like the GT4 European Series or the ADAC GT4 Germany. GT4 is often used as a stepping stone for young talent entering the world of GT racing.

Both categories are also incredibly popular in sim racing, with nearly all the current sims, like iRacing, Assetto Corsa Competizione or even Gran Turismo featuring both categories. Fanatec has great products on offer to simulate these categories, like the Podium Steering Wheel GT3 Endurance or the Podium Steering Wheel BMW M4 GT3, which is exactly the same steering wheel as used in the real BMW M4 GT3 Evo racecar.

In summary: GT3 cars are faster, more technically advanced, and more expensive—designed for professional competition. GT4 cars stay closer to the production model, are easier to drive, and more affordable—making them ideal for entry-level or amateur racing.