iRacing 2025 Season 4 Patch 4 update
iRacing’s 2025 Season 4 Patch 4 focuses on fixes, including a long-session framerate drop, race control precision tweaks, UI corrections, audio and AI updates, plus several car-specific setup and repair changes.
We’ve got a small but important iRacing patch update: the official 2025 Season 4 Patch 4 notes describe a fix-heavy release with a few targeted updates across simulation systems and specific cars.
What changed
Features
- 2025 Season 4 Patch 4 release notes published for build
2025.11.18.02.
Fixes
- iRacing says this patch contains important fixes and some updates for the 2025 Season 4 release.
Simulation
- Fixed a recent issue where framerate could drop significantly after racing for some time.
- Slightly improved precision for verifying missed checkpoints and course-cut black flags.
- AI drivers were improved at Circuit des 24 Heures du Mans.
- Fixed an audio issue where nearby opponent car RPM could sound much too high.
- Improved the performance and functionality of the Skew (S) meter.
- Corrected some Best Times and Delta Times bindings.
- Added a subtle background to the player entry for Relative Brake Bias.
- Fixed the FOV calculator so it accepts text input in Settings.
- Fixed Custom Sector +/- time display behavior.
- Fixed a Camera Tool context-menu crash-to-desktop issue.
- Updated to the latest Simucube API.
Cars
- Audi 90 GTO: brake bias adjustments are now allowed in Fixed Setup events.
- Cadillac CTS-V Racecar: all vehicle damage can now be fully repaired during pit stop repairs.
- 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: all vehicle damage can now be fully repaired during pit stop repairs.
- VW Jetta TDI Cup: all vehicle damage can now be fully repaired during pit stop repairs.
- Dallara IR-05: brake bias adjustments are now allowed in Fixed Setup events.
- Riley MkXX Daytona Prototype - 2008: all vehicle damage can now be fully repaired during pit stop repairs, and brake bias adjustments are now allowed in Fixed Setup events.
From the changelog
Structured change list parsed from the official notes.
features
- [h2] 2025 Season 4 Patch 4 Release Notes \[2025.11.18.02] [/h2]
fixes
- This Patch Release contains important fixes as well as some updates for the 2025 Season 4 Release.
cars
- [h2] Simulation: [/h2] [h3] Performance [/h3] [*] Fixed a recent and prevalent issue where framerate significantly drops after racing for some length of time. [/*] [h3] Race Control [/h3] [*] Slightly improved the precision used for verifying missed checkpoints and course cut black flags. [/*] [h3] AI Racing [/h3] [*] AI Drivers have improved their racing skills at Circuit des 24 Heures du Mans. [/*] [h3] Audio [/h3] [*] Fixed an issue where the RPM on nearby opponent cars could appear to sound substantially too high. [/*] [h3] User Interface [/h3] [*] 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. [/*] [h3] Controls [/h3] [*] Updated to the latest Simucube API. [/*]
- [h2] Cars: [/h2] [h3] Audi 90 GTO [/h3] [*] Brake bias adjustments are now allowed in Fixed Setup events. [/*] [h3] Cadillac CTS-V Racecar [/h3] [*] During pit stop repairs, all vehicle damage may now be fully repaired. [/*] [h3] Ford Mustang GT4 [/h3] [*] Improved windshield wiper animations and visual effects. [/*] [h3] HPD ARX-01c [/h3] [*] Brake bias adjustments are now allowed in Fixed Setup events. [/*] [h3] Nissan GTP ZXT [/h3] [*] Brake bias adjustments are now allowed in Fixed Setup events. [/*] [h3] Pontiac Solstice [/h3] [*] During pit stop repairs, all vehicle damage may now be fully repaired. [/*] [h3] VW Jetta TDI Cup [/h3] [*] During pit stop repairs, all vehicle damage may now be fully repaired. [/*] [h3] \ Dallara IR-05 [/h3] [*] Brake bias adjustments are now allowed in Fixed Setup events. [/*] [h3] \ Riley MkXX Daytona Prototype - 2008 [/h3] [*] During pit stop repairs, all vehicle damage may now be fully repaired. [/*] [*] Brake bias adjustments are now allowed in Fixed Setup events. [/*]
Sources
Running a iRacing league?
Racey automates signups, stewarding & standings — so you run the racing, not the spreadsheets.
Get started free →More iRacing updates
iRacing 2026 S3 Patch 3 update
iRacing’s 2026 Season 3 Patch 3 adds an early multi-class multi-pace car start test path, fixes several race control, graphics, spotter, telemetry, UI, car, and track issues, and adjusts pit stop timing for NASCAR Cup Series Gen 7.
iRacing 2026 S3 Patch 2 update
iRacing’s 2026 Season 3 Patch 2 delivers fixes across launcher, sim stability, race control, UI, telemetry, GT3 and specific car behavior, plus a few track-side corrections.
iRacing 2026 S3 Patch 1 adds Qualcomm AI support, GT3 TC fixes, and telemetry expansion
This patch focuses on fixes and small improvements across AI, UI, controls, telemetry, cars, and several tracks, plus support updates for Qualcomm Circuit and the BMW M2 Racing in Demo Drive.