iRacing 2026 Season 4 launches with four new cars and rescanned tracks

iRacing has released its 2026 Season 4 build, introducing four new vehicles and three re-scanned circuit layouts alongside a range of interface and quality-of-life improvements.

The new car roster includes the Aston Martin Valkyrie AMR-LMH, making its debut in the simulator with rain capability enabled from launch. Two Caterham models—the 420R and Academy—arrive as a paired release, also rain-ready. A Gen 4 Grand National stock car rounds out the new machinery, offering early-2000s oval racing nostalgia.

On the track side, Road America has been fully rescanned and rebuilt, now offering four total configurations including two new Short layouts. Milwaukee Mile gains an infield road course layout alongside its oval, while all five Mid-Ohio Sports Car Course configurations have received updated scans and rebuilds. Existing vehicles—the Global Mazda MX-5 Cup and paved Sprint Car—have undergone major physics and visual overhauls. Summit Point Raceway and Michelin Raceway Road Atlanta have also received cosmetic updates.

The new build introduces expanded pit summary and car damage widgets, a reference car UI for time trial and test drive modes, minimal and pinned UI options, and an improved fuel calculator. Multi-class pace car starts are now available at more than 50 track layouts. Backend improvements include multi-threaded physics updates, expanded car rule sets, and full UTF-8 character support. All four new cars and every configuration of the three rescanned tracks are immediately available for AI racing, alongside several additional classic vehicles and track variants.