Quote:
Originally Posted by serialk11r
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.
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Your absolutely right! and based on logic that we should not be seeing carbon build up because of the port injection...but unfortunately its not true IRL. owners are still both D4S and DI engines are seeing similar early carbon buildups, with D4S being the lesser of two evils.
Its not entirely clear why they are getting carbon, but they do know that DI plays a major roll in it.