On Swamps site they talk about the 58V FICM adding 40rwhp gains..
Off there site:
The higher output voltage of our 58v FICM forces the fuel injector to open more quickly, which allows the fuel injector to flow slightly more fuel than the lower/stock voltage unit. The quicker action of the fuel injector also slightly advances the injection timing.
The results with the 58v FICM is that the truck will pick up an additional 40rwhp; even with the standard Ford programming.[/QUOTE]
NO the 58v is NOT adding those gains, its the custom ficm tuning that is giving any kind of gain.
58v upgrade will just improve cold starting ability, Im sorry but I see no way in how a little more voltage will enhance injection timing when the programming isn't commanding the module to send to the injectors...
So your saying this in incorrect?