Building a 625 Horsepower Coyote Street Engine That Turns 8,500 rpm

This Horsepower Wars build chases 625 horsepower from a Ford Coyote that spins to 8,500 rpm, race-engine numbers aimed at the street. The twist: with help from AEM Electronics and Ford Racing, the team converted their carbureted Coyote back to fuel injection using AEM’s Infinity system, then proved the swap with real gains on the dyno. It’s a detailed look at where modern EFI beats a carb. Watch to see the numbers.

Most street engines are winding down by 6,500 rpm. This one is just getting interesting. The team behind this build set out to make 625 horsepower from a Coyote that spins all the way to 8,500 rpm, figures that sound like race-only territory but are aimed squarely at the street. To get there, they made a counterintuitive move: they took a carbureted Coyote and converted it back to fuel injection. Why walk away from the simplicity of a carb, and what did that decision unlock on the dyno? The gains tell the story.

625 Horsepower at 8,500 RPM

Ford‘s Coyote 5.0 is already a marvel of modern engineering, but chasing 625 horsepower with an 8,500-rpm ceiling pushes it into rare air for a street combination. High-rpm capability like that is not just about a big peak number; it is about how the engine delivers power across the top of the range, where races are so often won. This project treats the Coyote as a high-winding performance platform rather than a mild daily-driver mill, and the target reflects that ambition.

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From Carburetor Back to Fuel Injection

The twist in this build is the direction of the change. With help from AEM Electronics and Ford Racing, the team converted their carbureted Coyote back to fuel injection using AEM’s Infinity engine management. Carburetors have a certain old-school appeal, but modern EFI offers precision that a carb simply cannot match, with control over fuel delivery and timing across every rpm and load point. On a peaky, high-revving engine, that control is exactly where the advantage lives.

Why the EFI Swap Paid Off

The payoff showed up where it counts: on the dyno, the fuel-injected combination made serious gains over the carbureted setup. That is the whole point of the exercise, proving that the added complexity of EFI translates into real, measurable power on a street-focused engine. For anyone weighing carb versus injection on their own build, this project is a compelling data point documented in detail. Watch the full video and share your thoughts below.

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