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As many of you know we are developing the the Hydra EMS for thethe FA20 and therefore we must first understand the oem DI strategy. I know more specifics about exact timing and durations than I will share but for the FA20 the direct injection under a WOT pull only fires on the intake stroke both BTDC and ATDC and injection timing is shorter at low RPM vs. High RPM as you would imagine. Now the port injection is not used under these circumstances until after 5k rpm.
At this point it doesn't appear the port injection is required for fuel delivery at high rpm in NA form and as suggested it could be related to catalyst temperature control. Until i actually try to utilize DI exclusively at these RPMs I'm only speculating from the data we've gathered.
Thanks
Phil Grabow
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