IndyCar will begin testing prototypes of a new Dallara-built IR28 chassis this summer using the current-spec 2.2-liter turbo V6 engines and Mahle 100 hp ERS hybrid units while 2028 engine regulations are finalized, Racer Magazine reports.
Dallara has supplied IndyCar chassis for 31 seasons and built a factory in Indianapolis; the series delayed a chassis replacement from 2027 to 2028 after pandemic setbacks and engine-production timing issues.
IndyCar, Honda, and General Motors have not finalized 2028 drivetrain specifications, which are rumored to at least double hybrid power and could push system output toward 900 horsepower versus the current platform's roughly 750 horsepower, increasing demands on chassis safety and durability.
IndyCar president Doug Boles told Racer Magazine he has held regular meetings with Honda and Chevrolet and that the parties are working to decide rules quickly, though he did not provide a precise timeline.
This article is based on reporting from Jalopnik.
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