iRacing published Patch 4 for the 2025 Season 4 build on 2025-11-18. The small but focused release targets a standard framerate drop, improves AI behavior at Circuit des 24 Heures du Mans, and delivers several car and UI tweaks.
Patch Notes – iRacing – 2025.11.18.02
Simulation
Performance
- Fixed a recent and prevalent issue where framerate significantly drops after racing for some length of time.
Race Control
- Slightly improved the precision used for verifying missed checkpoints and course cut black flags.
AI Racing
- AI Drivers have improved their racing skills at Circuit des 24 Heures du Mans.
Audio
- Fixed an issue where the RPM on nearby opponent cars could appear to sound substantially too high.
User Interface
- Improved the performance and functionality of the Skew (S) meter.
- Corrected some bindings for Best Times and Delta Times.
- Add a subtle background to the Player’s entry for Relative Brake Bias.
- Fixed an issue in Settings where the FOV calculator would not accept text inputs.
- Fixed an issue where the Custom Sector box was not showing +/- time correctly.
- For the Camera Tool, fixed a crash-to-desktop error with the context menu.
Controls
- Updated to the latest Simucube API.
Cars
Audi 90 GTO
- Brake bias adjustments are now allowed in Fixed Setup events.
Cadillac CTS-V Racecar
- During pit stop repairs, all vehicle damage may now be fully repaired.
Ford Mustang GT4
- Improved windshield wiper animations and visual effects.
HPD ARX-01c
- Brake bias adjustments are now allowed in Fixed Setup events.
Nissan GTP ZXT
- Brake bias adjustments are now allowed in Fixed Setup events.
Pontiac Solstice
- During pit stop repairs, all vehicle damage may now be fully repaired.
VW Jetta TDI Cup
- During pit stop repairs, all vehicle damage may now be fully repaired.
[Legacy] Dallara IR-05
- Brake bias adjustments are now allowed in Fixed Setup events.
[Legacy] Riley MkXX Daytona Prototype – 2008
- During pit stop repairs, all vehicle damage may now be fully repaired.
- Brake bias adjustments are now allowed in Fixed Setup events.
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