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Originally Posted by bmussatti
This should be called DFI...not FSI.
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In Porsche's case, there is an acronym for it that starts with a 'D' - I don't remember the other two letters, though...I think it IS DFI.
VW and Audi refer to theirs as FSI, because it stood originally for "Fuel Stratified Injection" - describing what would happen to the fuel charge in the combustion chamber in an ultra-efficient burn mode that allowed for maximum fuel economy. It's typicall labeled as "Fuel Straight Injection" now, referring to the fact that the charge is sent straight (direct) into the combustion chamber, not introduced at the base of the intake manifold just above the intake valves, like in a non direct injection car. I don't know if current-production VW/Audi cars with FSI still have the lean-burn mode or not.