Probably the easiest way to go would be to copy an existing GDI (Gasoline Direct Injection) setup. For instance, find out what pressures the Audi GDI injectors are run with, and use those--they should atomize the fuel nicely.
It's not the cheapest way to go, I'm sure, but those folks have already solved the problems. Much easier to use what they've done...
-soD
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