iRacing Season 4 update adds new cars, tracks and UI tools

Four new cars, three rebuilt tracks

The official release adds four new cars: the Aston Martin Valkyrie AMR-LMH, the Caterham Academy, the Caterham 420R and the Gen 4 Grand National. iRacing describes the lineup as a broad mix of vehicles representing different ways drivers race.

Three tracks have also been fully re-scanned and re-built: Road America, Mid-Ohio Sports Car Course and The Milwaukee Mile. According to the announcement, these versions fully replace the older tracks.

Two more circuits, Summit Point Raceway and Road Atlanta, received major artwork updates. The release note says these changes bring their appearance into the modern era.

Physics and vehicle updates aim at realism

The release also includes a physics processing engine upgrade that allows multi-threading, which iRacing says is intended to make object interactions more accurate.

Car Rule Sets have been added to dozens more vehicles, expanding the structure and options available across racing formats.

Two vehicles received a significant mechanics overhaul: the Global Mazda MX-5 Cup and the Sprint Car. iRacing says both should feel nearly brand new and drive more closely to their real-life counterparts.

New tools in the sim and UI

The simulation has been updated for full UTF8 character support, covering chat messages, display names and associated file names for replays, setups and camera sets. That matters for international users, organized leagues and content creators who rely on clear naming and communication.

iRacing has added a Reference Car UI, which shows live control inputs from a reference car in solo sessions. The company says this is meant to help users learn and improve technique.

Two new UI widgets are also included: Pit Summary, which centralizes pit-stop control and visibility, and Car Damage, available for select cars to show general vehicle health. The F9 Black Box has been reworked into a Quick Access panel, and a new Minimal UI mode can strip the interface down to only the essentials and pinned elements.

The Fuel Calculator Widget has been refined with more data for improved estimates, while the Track Map Widget has received quality improvements.

Launchers, leagues and companion app changes

Outside the cockpit, the iRacing Launcher team has rebuilt the Team Registration process to make it easier to see how a team is registered for an event and what each member is signed up for.

The Leagues area has been refreshed, and Past Results can now be viewed as individual pages. The release note also says that when launching a solo session from an Official Session, users may carry over the event BoP into their test session.

iRacing has also rebuilt the Companion App, which the announcement says will support future development. Users are advised in the release note to install the latest version from their device’s app store if they have not already done so.

AI racing expands to more content

AI racing support has been expanded to eight new cars: the Aston Martin Valkyrie AMR-LMH, Caterham Academy, Caterham 420R, Gen 4 Grand National, Chevrolet Corvette C7 Daytona Prototype, Formula Renault 2.0, BMW Z4 GT3 and Riley MkXX Daytona Prototype - 2008.

The feature also now covers 19 new track configurations, including Auto Club Speedway - Competition, Interior and Moto, Federated Auto Parts Raceway at I-55 and Kansas Speedway. The source excerpt continues beyond that list, but the supplied packet cuts off before the full set of configurations is completed.

For offline practice, leagues and broadcast preparation, this wider AI support can help users test on more combinations of cars and tracks without needing a live grid.