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2025 S4 Patch 1

iRacing 2025 Season 4 Patch 1 update

Patch 1 for iRacing 2025 Season 4 focuses on UI and drive-screen fixes, hybrid-system and setup updates across multiple cars, and a small set of track rule and visual changes.

carstracks

We’ve gone through iRacing’s 2025 Season 4 Patch 1 notes. This patch is mainly a cleanup pass on the Season 4 release, with simulation UI fixes, hybrid-system updates, several setup revisions, and a handful of track adjustments.

What changed

Simulation and UI

  • Fixed several UI issues, including excessive decimal precision, spin-control feedback, first-time flag stutter, and an FOV calculator bug involving imperial/metric units.
  • Added VR screen-space controls in Options.
  • Session, Drive, Garage, and Options screens received multiple layout and readability fixes, including larger Virtual Mirror and Delta Bar sizes, better widget layering, and more UI scaling on the Drive screen.
  • Broadcast mode now includes split mode/broadcast UI.
  • Dirt Road collision and damage thresholds against the environment were raised, allowing more contact before incidents are triggered.
  • Audio updates include hybrid-system mixing fixes, tuned hybrid motor audio, and an app.ini option to show sound levels in dB.
  • Fanatec wheel auto-detection was improved.

Cars

  • GTP hybrid cars had a fix for deployment cutting unexpectedly after a few laps, plus a correction to allowable halfshaft power based on atmospheric conditions.
  • Many official iRacing setups were updated, including TCR, Audi 90 GTO, BMW M4 GT3, Dallara F3, multiple dirt cars, Ford GT GT2, Kia Optima, Mercedes W12/W13, Skip Barber, and Toyota GR86.
  • Mercedes W12 and W13 received hybrid and battery display fixes; both also got more aggressive attack mode behavior with greater battery drawdown. The W12 gained higher possible turbo boost at high-altitude tracks, while the W13 also got engine-braking adjustments.
  • Ford Mustang GT3 had a crash fixed for the lemans_fixed setup.
  • Ford Mustang GT4 pit limiter is now available in all gears, and its TC2 decrement bind was fixed.
  • Other car-specific fixes include BMW M Hybrid V8 rev limiter consistency, Porsche 718 GT4 control remapping, Acura NSX GT3 rainlight damage behavior, and Audi R18 onboard sound improvements.

Tracks

  • Mexico City received the most notable sporting change: the Turn 2 slowdown penalty was increased. It also got fence, texture, and oval restart-zone cone updates.
  • Daytona Road Course moved the anti-cut pyramid curbs in the Le Mans chicane closer to the sawtooth curbs.
  • Sonoma added missing UI images and made visual/physical touch-ups, including hairpin cone and wall changes for the IndyCar 2012–2018 layout.
  • Oulton Park got visual updates and added flagstand numbers.
  • Bristol, Chicago, Darlington, Dover, Homestead, Iowa, Kansas, Las Vegas, IRP, Martinsville, New Hampshire, Rockingham, and Talladega all had terrain seam patches.
  • Watkins Glen fixed floating marshals.

For league ops, we should refresh fixed setups, brief drivers on revised hybrid behavior, and update any event notes for Mexico City, Daytona Road, and Mustang GT4 pit-limiter use.

From the changelog

Structured change list parsed from the official notes.

cars

  • This Patch contains some updates and fixes for the 2025 Season 4 Release. You can find the Release Notes for this Patch below, or on the iRacing Forums here: [url="https://forums.iracing.com/discussion/85557/2025-season-4-patch-1-release-notes-2025-09-12-01"]https://forums.iracing.com/discussion/85557/2025-season-4-patch-1-release-notes-2025-09-12-01 [h2] Simulation [/h2][h3] User Interface [/h3] [*] GENERAL: [*] Fixed an issue where some values had excessive decimal precision. [/*][*] Fixed an issue where spin controls were lacking feedback when selected. [/*][*] Fixed stutter when race flags are shown for the first time. [/*][*] Added VR screen space controls to the Options menu. [/*][*] Fixed a FOV calculator bug that mixed up imperial/metric units, causing the FOV to come out wrong. [/*] [/*][*] SESSION SCREEN: [*] Added a gradient behind the steering wheel in the Session Screen to improve contrast. [/*][*] Fixed an issue where multiple items in the top bar of the Session Screen were not center-aligned. [/*][*] Fixed an issue where the driver select dropdown would not update when new drivers entered the session. [/*][*] Fixed an issue with the radar not keeping a square aspect ratio. [/*] [/*][*] DRIVE SCREEN: [*] In the F1 box, moved the real-time clock from the header space to the bottom row, and added a Sim-time clock alongside it. [/*][*] The F2 and F3 boxes have been adjusted to no longer require a scrollbar. [/*][*] Fixed an issue with the positioning of black box controls after moving them and then transitioning to another screen, or closing the Sim. [/*][*] Larger size options have been added for Virtual Mirror and the Delta Bar. [/*][*] Fixed an issue where all black boxes would grow larger when a car had a large car-specific black box. [/*][*] Fixed an issue with some elements clipping with a narrower top bar and the focus driver element. [/*][*] The tire change feedback icon is now hidden when not in a Race Session. [/*][*] UI layer settings for a few widgets have been adjusted to ensure layering priority for: Pit Speed, Pit Info, Pacing, Flags, and Penalties. [/*][*] To help make the drive screen UI and text larger and more readable, we adjusted the Drive Screen to allow UI scaling past where the Session Screen will stop applying it. [/*][*] Improved the spacing between the driver names and the AI helmets in the Results and Entries tabs. [/*] [/*][*] GARAGE SCREEN: [*] Fixed an issue where the garage canvas could overlap the bottom bar. [/*][*] The Tech Inspection spinner is now appropriately centered. [/*] [/*][*] OPTIONS SCREEN: [*] Dropdowns that have many options now correctly show a scroll bar at all times. [/*][*] Options Screen scaling within split layouts have been improved. [/*][*] Updated tooltips for the Controls section of the Options screen. [/*][*] Fixed the label for the Shift Aid option. [/*][*] Removed some extra borders from items in the Controller Configuration Wizard screens. [/*][*] Fixed an issue where sound cards could disappear from the Options screen if they had a unicode character in their name. [/*] [/*][*] BROADCAST MODE: [*] Added the split mode/broadcast UI. [/*] [/*] [h3] Dirt Racing [/h3] [*] Raised the collision and damage thresholds for Dirt Road cars making contact with the environment. This allows for a bit more aggressive driving before receiving an incident from a wall or bump collision. [/*] [h3] Graphics [/h3] [*] Fixed an issue where driver names that display on vehicles would incorrectly appear as uppercase, or not appear at all, when reloading the car paint via the CTRL+R command. [/*] [h3] Audio [/h3] [*] Fixed some audio level and mixing issues with the updated hybrid systems for all applicable cars. [/*][*] Hybrid motor audio has been tuned. [/*][*] A setting has been added to the “app.ini” file that allows users to display sound levels in dB units or a generic slider. [*] 'soundUiControlsInDb=1' displays the level sliders in dB. [/*][*] 'soundUiControlsInDb=0' displays the level sliders in a range from 0-100. [/*] [/*] [h3] Controls [/h3] [*] Improved the auto-detection of Fanatec wheels. [/*] [p align="start"] [h2] Cars [/h2][h3] GTP Class Cars [/h3] [*] For GTPs that feature the hybrid system, fixed an issue with the deployment cutting unexpectedly after a few laps. [/*][*] For the new hybrid system, added an atmospheric condition correction to the allowable halfshaft power. [/*] [h3] Touring Class Cars (TCR) [/h3] [*] iRacing setups have been updated. [/*] [h3] Acura NSX GT3 EVO 22 [/h3] [*] Fixed an issue where the rainlight would not properly disfigure with rear-end damage. [/*] [h3] Audi 90 GTO [/h3] [*] iRacing setups have been updated. [/*] [h3] Audi R18 [/h3] [*] Onboard engine sounds have been improved. [/*] [h3] BMW M Hybrid V8 [/h3] [*] Updated the rev limiter type to be consistent with other GTP cars in the class. [/*] [h3] BMW M4 GT3 [/h3] [*] iRacing setups have been updated. [/*] [h3] Dallara F3 [/h3] [*] iRacing setups have been updated. [/*] [h3] Dirt Big Block Modified [/h3] [*] iRacing setups have been updated. [/*][*] Strengthened the rear spoiler. [/*] [h3] Dirt UMP Modified [/h3] [*] iRacing setups have been updated. [/*] [h3] Ford GT GT2 [/h3] [*] iRacing setups have been updated. [/*] [h3] Ford Mustang GT3 [/h3] [*] Fixed a crash that was occurring with the iRacing lemans_fixed setup. [/*] [h3] Ford Mustang GT4 [/h3] [*] Adjusted the pit limiter to now be available in all gears. [/*][*] Fixed an issue with the decrement bind on the TC2 setting. [/*] [h3] Kia Optima [/h3] [*] iRacing setups have been updated. [/*] [h3] Dirt Late Model [/h3] [*] (ALL) - iRacing setups have been updated. [/*] [h3] Mercedes-AMG W12 E Performance [/h3] [*] Fixed an issue where the Battery SoC value was not displaying correctly in the In-Car Adjustments black box. [/*][*] For the new hybrid system, added an independent setting that overrides the selected deploy mode. This can be activated in fixed setups. [/*][*] For the new hybrid system, improved attack mode to be more aggressive with deployment but with greater battery drawdown. This improves its use as an overtaking tool but will hurt SoC management overall. [/*][*] Increased the maximum-achievable turbo boost to improve engine performance at high altitude tracks. [/*][*] iRacing setups have been updated. [/*] [h3] Mercedes-AMG W13 E Performance [/h3] [*] Fixed an issue where the Battery SoC value was not displaying correctly in the In-Car Adjustments black box. [/*][*] For the new hybrid system, added an independent setting for recharge mode that overrides the selected deploy mode. This can be activated in fixed setups. [/*][*] For the new hybrid system, improved attack mode to be more aggressive with deployment but with greater battery drawdown. This improves its use as an overtaking tool but will hurt SoC management overall. [/*][*] Added further adjustments to engine braking to improve braking stability. [/*][*] iRacing setups have been updated. [/*] [h3] NASCAR Gen 4 Chevrolet Monte Carlo - 2003 [/h3] [*] Gauge lightmap has been updated. [/*] [h3] Porsche 718 Cayman GT4 Clubsport MR [/h3] [*] TS and ESC switches are now mappable to the TC1 and TC2 in-car controls respectively. [/*] [h3] Skip Barber Formula 2000 [/h3] [*] iRacing setups have been updated. [/*] [h3] Toyota GR86 [/h3] [*] iRacing setups have been updated.

tracks

  • [/*] [h2] Tracks [/h2][h3] Autódromo Hermanos Rodríguez (Mexico City) [/h3] [*] Fixed an ad on the right-side wall near the start of the pit entry lane. [/*][*] The slowdown penalty at Turn 2 has been increased. [/*][*] A variety of config-specific fencing has been updated. [/*][*] Distant buildings textures have been updated. [/*][*] (Oval) - Moved the restart zone cones into the grass. [/*] [h3] Bristol Motor Speedway [/h3] [*] Some terrain seams have been patched. [/*] [h3] Chicago Street Course [/h3] [*] Some terrain seams have been patched. [/*] [h3] Darlington Raceway [/h3] [*] Some terrain seams have been patched. [/*] [h3] Daytona International Speedway [/h3] [*] (Road Course) - Moved the anti-cut pyramid curbs in the LeMans chicane closer to the sawtooth curbs. [/*] [h3] Dover Motor Speedway [/h3] [*] Some terrain seams have been patched. [/*] [h3] Homestead Miami Speedway [/h3] [*] Some terrain seams have been patched. [/*] [h3] Iowa Speedway [/h3] [*] Some terrain seams have been patched. [/*] [h3] Kansas Speedway [/h3] [*] Some terrain seams have been patched. [/*] [h3] Las Vegas Motor Speedway [/h3] [*] Some terrain seams have been patched. [/*] [h3] Lucas Oil Indianapolis Raceway Park [/h3] [*] Some terrain seams have been patched. [/*] [h3] Martinsville Speedway [/h3] [*] Some terrain seams have been patched. [/*] [h3] New Hampshire Motor Speedway [/h3] [*] Some terrain seams have been patched. [/*] [h3] Oulton Park Circuit [/h3] [*] Adjusted the visual popping distances on some tire bundles. [/*][*] Flagstand numbers have been added. [/*][*] Terrain texture has been updated. [/*][*] pit wall textures have been updated. [/*] [h3] Rockingham Speedway [/h3] [*] Some terrain seams have been patched. [/*] [h3] Sonoma Raceway [/h3] [*] All missing UI images have been added. [/*][*] (Indycar 2012-2018) - Adjusted the cones and walls around the hairpin. [/*][*] A variety of visual and physical touch-ups have been completed at this track, including: [*] A variety of floating objects have been tethered appropriately. [/*][*] Objects around the drag strip are now solid. [/*][*] Outer fences have been adjusted. [/*][*] Weekend crowds around the mini golf course area have been touched-up. [/*][*] Parasol and umbrella placements have been optimized for perfect picnicking. [/*][*] The tunnel area has been updated. [/*] [/*] [h3] Talladega Superspeedway [/h3] [*] Some terrain seams have been patched. [/*] [h3] Watkins Glen International [/h3] [*] Levitating track marshals have been grounded. They do not need to practice that behavior at work. [/*]

Official sources

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