2025 Season 4 Release

2025 Season 4 Release Notes [2025.09.09.01]

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The iRacing 2025 Season 4 Release Build has passed tech inspection and is ready to roll! This release introduces new content, features, improvements, and fixes for 2025 Season 4, which officially starts on September 16th at 0000 UTC!

“#soon” has arrived, and the new Sim UI is finally here! Rebuilt from the ground up, the new Sim UI utilizes modern technology, tools, and design principles to power an advanced new UI framework and in-sim experience. The new Sim UI should appear familiar in form to long-time users, with select new capabilities and functionality. This powerful new technology paves the way for significant future innovation and all-new sim experiences and features.

The iRacing vehicle garage expands with three new bays for three brand-new cars: the Aston Martin Vantage GT3 EVO, the Dallara IL-15 (INDY NXT), and the Ford Mustang GT4! The entire GT4 Class of cars has received a multifaceted performance, tires, and physics overhaul. The hybrid system for vehicles has been updated for improved realism. The drafting parameters for the NASCAR Gen4 cars have undergone extensive adjustments to optimize the racing experience. And the BMW M4 GT3 has been updated to the EVO spec with new physics and art.

The iRacing world map adds the legendary track, Autódromo Hermanos Rodríguez, direct from Mexico City. Sonoma Raceway, World Wide Technology Raceway, Charlotte Motor Speedway, and North Wilkesboro Speedway have each been re-scanned and remodeled. Six additional tracks have been overhauled with all-new artwork, including five on the NASCAR schedule and Oulton Park Circuit.

¡Saluda a España! iRacing introduces localization for many parts of the iRacing application. Customers may now select to use iRacing in European Spanish. We are still working on translation technology for some areas of the iRacing application, the Sim itself, and additional languages will also be coming in the near future.

All three new cars come fully equipped and ready for rain racing (Aston Martin Vantage GT3 EVO, Dallara IL-15, Ford Mustang GT4)! AI Drivers are ready for competition with FIVE new cars (Aston Martin Vantage GT3 EVO, Dallara IL-15, Ford Mustang GT4, and the NASCAR Gen4 Class Cars)! And, AI Drivers have already mastered North Wilkesboro Speedway - Oval and all seven track configurations for the brand new Autódromo Hermanos Rodríguez (Mexico City)!

Season highlights include:

• New Sim UI

• Aston Martin Vantage GT3 EVO

• Dallara IL-15 (INDY NXT)

• Ford Mustang GT4

• Physics Overhaul for the GT4 Class, including Rain Tires updates

• BMW M4 GT3 updated to EVO spec

• Hybrid System Overhaul

• Substantial NASCAR Gen4 Drafting Updates

• Autódromo Hermanos Rodríguez (Mexico City)

• Rescanned and remodeled tracks: Charlotte Motor Speedway, North Wilkesboro Speedway, Sonoma Raceway, and World Wide Technology Raceway.

• Overhauled and modernized tracks: Chicago Street Course, Circuit of the Americas, Daytona International Speedway, Texas Motor Speedway, Watkins Glen International, and Oulton Park Circuit

• Texture Compression Update

• VR Headset Eye-Tracking Foveated Rendering Support

• European Spanish for much of the non-in-Sim iRacing application

• All three new cars come ready for rain racing! (Aston Martin Vantage GT3 EVO, Dallara IL-15, Ford Mustang GT4)

• AI Racing is now available with FOUR new cars! (Aston Martin Vantage GT3 EVO, Ford Mustang GT4, and the NASCAR Gen4 Class Cars)

• AI Racing is now available at North Wilkesboro Speedway, Circuit of the Americas - NASCAR West, and all SEVEN track configurations for the brand new Autódromo Hermanos Rodríguez (Mexico City)! AI Drivers have also been retrained from scratch at Charlotte Motor Speedway - all EIGHT non-Dirt configs, Sonoma Raceway - all NINE non-Dirt configs, and World Wide Technology Raceway (Gateway) -