Alexander Rossi piloted IndyCar's new IR28 chassis at Indianapolis Motor Speedway, marking the first validation test of the Dallara-built spec car Rossi drove for Ed Carpenter Racing. The IR28 represents the next generation of IndyCar machinery and will replace the current IR22 platform starting in 2028.
Rossi became the first Chevrolet-powered driver to evaluate the new chassis, a significant milestone as IndyCar prepares its technical regulations overhaul. The IR28 development carries weight beyond single-car validation. Manufacturers like Chevrolet and Honda face tight deadlines to prepare power units compatible with the new platform. Engine development cycles compress as teams balance current-season competition with future architecture integration.
The IR28 introduces evolved aerodynamics, updated safety structures, and modern electronic systems. IndyCar engineered the new platform to maintain racing competitiveness while reducing costs and complexity compared to the current generation. Early chassis testing at IMS provides crucial data on baseline performance before expanded manufacturer testing and competitive simulation begin.
Rossi's feedback carries credibility. The Ed Carpenter Racing driver brings experience across multiple IndyCar chassis generations and boasts intimate knowledge of IMS dynamics. His initial observations from the IR28 shakedown will inform Dallara's refinement process and help identify areas requiring attention before wider testing programs commence.
The IR28 timeline accelerates as 2028 approaches. IndyCar executives prioritized this validation phase to catch unforeseen issues early, avoiding late-development surprises that plagued previous spec-chassis transitions. Rossi's run scratches the surface of what promises months of systematic testing before the new car hits competitive trim in two seasons.
For Ed Carpenter Racing and other Chevrolet teams, the IR28 validation test opens a competitive window. Early access to chassis