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Formula 1 hybrid turbocharger
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IndyCar BorgWarner EFR7163 turbocharger
Formula 1 current engine hybrid turbo boost pressure: Up to 5 bar but varies by engine manufacturers - single-turbo hybrid
IndyCar Series current engine turbo boost pressure: 1.3 bar (superspeedways (ovals length 1.5-mile and beyond); 1.5 bar (short ovals, Road/Street Courses and Indianapolis 500 qualifying); 1.65 bar (with Push-To-Pass) - twin-turbos
So why IndyCar turbo boost pressure is more smaller than Formula 1?