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It's true, given the two scenarios, the carb will make more power at wide open throttle. Nascar LOST hp by going to EFI. Pro Stock drag racers LOST hp by going to EFI. And I'm by no means a carb fan at all. To this day I hate working on that god forsaken stuff, but they will make the most power. Driveability will be better with EFI, mileage will be better with EFI, tuning will be easier with EFI, and it will likely make more power everywhere else in the rpm range, but in that one area, at wide open throttle, the carb will out power the EFI.
There's a solid reason for it. Because the higher up in the intake runners you can start the fuel mixing process, the more homogenized the mixture will be, and the fuel has a cooling effect as it goes through the intake, too. Like I said earlier in this thread, put the injectors as high up in the intake tract as possible and it'll make the most power. Without a doubt. Might run like stink everywhere else in the rpm range, might be a bear to start when cold, but it'll make more power at WOT. Look at any of the current nascar or pro stock intakes and compare injector location to those on your street car. They will always be as high up as possible or allowed by rule. This isn't by accident.
Now, with all of that said, if you could stick the EFI injectors at the very top of the intake tract (much like the mechanical fuel injection that Porsche used in the race cars), you'd negate the carb's advantage, but not with the injectors spraying just an inch or two from the intake valve. There simply isn't enough time for the fuel to thoroughly mix with the air.
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