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As Honda spends its development time working on the twin turbocharger, which Chevrolet has used since its 2012 re-entry, the manufacturer must also juggle not losing anything in performance this season. Dixon’s three wins in July have vaulted him to second in the standings and only 31 points behind IndyCar series leader Helio Castroneves with five races remaining.

“It’s quite a challenge, because essentially what we’re doing is doing two engines at once,” Eriksen said. “Obviously we want to be continually pushing our competitiveness of the current engine, because we want to beat GM at every opportunity. But you also have to make sure that you’re in parallel making the very best twin turbo engine that you can. It’s a pretty big tear-up to go from single to twin.”


AP Auto Writer Tom Krisher contributed to this report from Traverse City, Mich.