Thread: New EFI system

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Randy,
I believe you'll find that even though the OEM Ford system has eight injectors arranged in the intake runners they are fired in a batch mode, four & four, in opposing groups - i.e., the two most forward cylinders share a crank journal, so they are in opposing injector groups, injectors not firing together. As I understand it, the benefit of more injectors in a direct port arrangement is turndown, being able to achieve the desired F/A ratio from idle to full RPM. Since you have eight they can be smaller, and can be turned down to a lower flow value. The throttle body injection is more like a carb, providing a consistent F/A ratio into the intake based on MAP and RPM which together relate directly to load. I've never seen any information regarding injectors not being able to fire quick enough at high RPM, at least not for a normally aspirated street engine - not saying it is not true, just that I have never seen anything from a manufacturer citing that as a problem providing you have the required 40+ psig fuel supply.

Like you, I did not like the "look" of the OEM Ford intake, and I had guys at the performance shop pushing me toward the FAST system to look like a 4-barrel but I wanted the "tunnel ram" look of the Edelbrock, or something like that. I would be looking at a self learn system today, if I were starting over.