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NEWS
News
26
September
2025
iRacing 2025 Season 4: A Revolution in Sim Racing
iRacing 2025 Season 4: A Revolution in Sim Racing
The most significant update in years transforms the virtual racing experience
iRacing has officially released Season 4 2025, a monumental update that marks an epochal turning point in the world of sim racing. Launched on September 16, 2025, this version introduces revolutionary features that completely redefine the virtual racing experience.
The New User Interface: The Future Has Arrived
The most anticipated feature of this season is undoubtedly the New Sim UI, completely rebuilt from scratch using modern technologies. After years of development, iRacing has finally abandoned the old legacy interface, introducing a more flexible and powerful system that promises to pave the way for significant future innovations.
The new UI maintains visual familiarity for longtime users while integrating new functionalities and advanced capabilities. This modernization represents a solid technological foundation for future expansions and improvements to the in-sim experience.
Three New Cars for Every Category
Aston Martin Vantage GT3 EVO
The iconic British manufacturer brings its latest GT3 evolution to the track. Presented in 2024 as an upgrade to the original 2019 version, the Vantage GT3 EVO boasts significantly revised aerodynamics, especially in the nose area, and updated suspension. The beating heart is a 4.0-liter twin-turbo V8 capable of producing up to 600 horsepower, depending on regulations.
The Vantage's successes have already demonstrated its worth: from victory at the 2024 24 Hours of Spa with Comtoyou Racing (by over 30 seconds) to winning the Gold Cup division in 2025 with Verstappen.com Racing, which included former iRacing Nurburgring 24H winner Chris Lulham in the lineup.
Dallara IL-15 (INDY NXT)
The penultimate step in the "Road to Indianapolis" makes its debut in iRacing. This 450-horsepower single-seater, with an additional 50 HP available via Push-to-Pass, represents the final step before the definitive jump to INDYCAR. Weighing just 626 kg with considerable aerodynamic downforce generated by wings and floor tunnels, the IL-15 positions itself as an appealing alternative to Super Formula Lights for drivers who prefer North American circuits.
Ford Mustang GT4
The first North American brand to enter iRacing's GT4 class. Presented in summer 2023 for use from 2024, the current Ford Mustang GT4 has rapidly gained worldwide popularity. Its unmistakably American style is backed by immediate results: already in its first race weekend, part of the IMSA VP SportsCar Challenge opener, it demonstrated its competitive capabilities.
Autódromo Hermanos Rodríguez: The Mexican Debut
For the first time in iRacing's history, Mexico officially enters the map with Autódromo Hermanos Rodríguez. This legendary circuit, born as a thesis project by student Oscar Fernandez in the 1950s, has hosted some of the world's most iconic automotive series.
Unique Circuit Characteristics
Located 2,238 meters above sea level, the altitude gives the track unique characteristics: the thin air reduces aerodynamic drag, allowing single-seaters to reach speeds exceeding 220 mph on the 1.2 km main straight.
The main 4.3 km layout includes the famous Foro Sol section, which passes through baseball stadium seating - a unique architectural feature in the automotive panorama. This same area was used for the Race of Champions in 2019.
iRacing presents the circuit in seven different configurations, all AI-enabled, offering racing opportunities for a wide range of vehicles and championships.
Cutting-Edge VR Technology
Season 4 introduces eye-tracking foveated rendering, an evolution of fixed foveated rendering. This revolutionary technology prioritizes processing power exactly where the driver's eye is looking, regardless of head direction. The result is a crystal-clear image wherever the gaze shifts, maintaining high frame rates and fast refresh times.
For VR headsets that support this feature, the experience becomes significantly more immersive and performant.
NASCAR Refresh: A Completed Project
With Season 4, iRacing completes the "NASCAR Refresh" project, begun in previous seasons. All NASCAR calendar circuits have been updated with:
Completely Rescanned and Remodeled Circuits
- Charlotte Motor Speedway
- North Wilkesboro Speedway
- Sonoma Raceway
- World Wide Technology Raceway
Artistically Updated Circuits
- Chicago Street Course
- Circuit of the Americas
- Daytona International Speedway
- Texas Motor Speedway
- Watkins Glen International
- Oulton Park Circuit
All these updates are free for current track owners, representing a significant investment by iRacing in content quality.
Enhanced Artificial Intelligence
AI racing expands considerably with Season 4:
New AI-Enabled Vehicles
- Aston Martin Vantage GT3 EVO
- Ford Mustang GT4
- Complete NASCAR Gen4 Class
- All seven Autódromo Hermanos Rodríguez configurations
AI-Updated Circuits
- North Wilkesboro Speedway
- Circuit of the Americas - NASCAR West
- Charlotte Motor Speedway (all 8 non-dirt configurations)
- Sonoma Raceway (all 9 non-dirt configurations)
AI drivers have been retrained from scratch on these tracks, ensuring more realistic and competitive driving behaviors.
Adverse Weather Support
All three new vehicles (Aston Martin Vantage GT3 EVO, Dallara IL-15, Ford Mustang GT4) arrive rain-ready, further expanding racing options in variable weather conditions.
Technical and System Improvements
Controls and Hardware
- Extended support for 360Hz devices
- Resolution of stability issues with Moza devices
- Fixes for intermittent crashes with Fanatec wheels
Telemetry and Data
- New boolean variables "PitRepairNeeded" and "PitOptRepairNeeded"
- Updated fuel warnings with momentary controls
- Adjustable fuel warning trigger point in garage
Renewed Series and Competitions
Season 4 introduces regional formats for GT3, following the success of F4 Regional Series. America, Asia-Pacific, and Europe regions will have races every hour at :45, expanding global competition opportunities.
New Special Series
- Rain Master: Hourly series for wet weather driving enthusiasts
- GT3 Regional: Tri-continental format
- Advanced Pro 2 Lite Off-Road: Exclusively on short course tracks
Impact on the iRacing Ecosystem
This Season 4 represents much more than a simple update: it's a statement of intent for iRacing's future. The new UI opens previously impossible possibilities, while content expansion and AI functionality demonstrate the platform's commitment to an increasingly realistic and accessible experience.
The introduction of the first Mexican circuit in iRacing's history also marks an important geographical expansion, promising to attract new users from the Latin American market.
Conclusion
iRacing 2025 Season 4 isn't simply a seasonal update, but a true technological revolution. From the completely renewed foundations of the user interface to innovative VR technologies, through significant expansion of the car and track roster, this release establishes new standards for the sim racing industry.
The completion of the NASCAR Refresh project, combined with the introduction of highest-quality content like Autódromo Hermanos Rodríguez and three new vehicles, demonstrates iRacing's commitment to providing the most authentic and engaging virtual driving experience available in today's market.


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