Quote:
Originally Posted by White Shadow
There are plenty of GDI cars that are also turbocharged. Why would you want or need port injection (or port along with direct injection) on a forced induction application? If anything, I think GDI is better suited for forced induction in the first place.
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It is but it isn't. Think about it like this, in stock form direct injection is king with forced induction applications; largely because you don't have to use additional fuel to prevent detonation because the mixture happens in the combustion chamber and not before the intake valve thus allowing for a cooler mixture and increased volumetric efficiency.
This becomes a problem though when you're looking to turn it up a notch. The injectors atomize almost to the same extent diesels do; because your mixture happens inside the combustion chamber you end up with a limited time frame to form a homogeneous mixture. The only way to combat things going south is to restrict airflow, hence the reason he said there's a restriction in fueling because naturally if airflow is being restricted then so is the amount of fuel for stoichiometric purposes.