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From the other threads, I am fairly sure that port injection is on most of the time, it only goes off at near max. throttle for maximum torque. At other times it's a mix to make the distribution of fuel in the cylinder as even as possible, to save fuel/emissions since these engines run stoichiometric A/F ratios for emissions. At mid rpm if the throttle is partially closed this should still apply. Maybe someone else can correct me if I'm wrong...
Of course if you only drive a D4-S engine say, on the track, you're mostly using just the direct injector, and that would be a problem.
@Allch Chcar what's up? I don't get the "whoa there cereal"...
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