My Roadtrek wrote:
'The gen.2 ecoboost engines have both port injection and GDI systems (all cylinders)"
I believe this is to eliminate the carbon build up.
That dual injection (port and direct) is for the new Ecoboost 3.5 HO (High Output) engine that will appear in the 2017 Raptor pickup this fall and eventually in the Ford GT sports car.
Here's Road and Track's description of the new Ecoboost 3.5 HO:
Calling the 3.5-liter EcoBoost V6 that's destined for the new Ford GT and second-generation Raptor pickup a high-output version is a bit disingenuous. Ford basically wiped the slate clean to make it, retaining only the displacement measurement—and, you know, the fact it has six cylinders in a vee configuration fed by turbochargers and direct injection.
It starts with a new block, heads, pistons, and intake, plus bigger turbos. Ford adds a dual-injection system, a combination of port and direct fuel injection, like Subaru uses on the BRZ/FR-S motor. That makes the H.O. 3.5 the first and only EcoBoost engine to use port injection. Ford calls this a second-generation EcoBoost, so maybe that dual-injection scheme will spread to other engines.
