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Originally Posted by BAN SUVS
DI opens up a whole new set of parameters for fuel tuning. With standard FI, you only determine the length of injector pulse. With DI, you determine timing, length, and sometimes even run multiple pulses in one combustion cycle.
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The multiple pulses on different strokes are pretty cool, that sounds like the one big difference. I totally agree that it's good stuff that will open the door to monster engines that still get good mileage, but it just seems like programming it wouldn't be a huge step from what we already have. Even in the Ford EEC-IV (1987 vintage) I can change injector pulsewidth and injector timing.