[Mr.Fixit]

Coyled,

Apparently you do not understand your motor. There is very little air in an intake manifold when the throttle blades are closed. The air that is in there is at a very low pressure, much less than atmosperic (not a complete vacuum, but very low oxygen density). It is the act of starving the motor for air (not fuel)which controls the RPM of the motor, give it all the air it wants and it will rev until the valves float. The instant you open the throttle blades, air is sucked down the runners and into the cylinder, bringing the fuel with it. You can have the fuel dispensed into the airstream up at the throttle blades, or down in the runner right next to the intake valve, it doesn't matter; your motor needs both at the same time to do anything. The good thing about moving the injector down nearer the valve is you avoid manifold wetting, which causes some fuel mixture problems. Those problems are mostly of concern to the emissions, not the performance of the engine. Fuel lag as you refer to it, is really more of an airflow lag. The greater the volume of your intake manifold between the throttle blades and the intake valve, the farther the air has to flow to respond to the throttle position change. (air velocity is equally important too) Contrary to your statement, I have driven many fuel injected motors. Even the same motor before and after getting (port injection) FI.