Pulsed injectors on/off times

[Ameer Antar]

This sort of general auto tech question, but I'm considering using it on an 
Audi. For injectors, how do you find the values such as max t-on and min 
t-off. In other words, is there some standard percentage of rated flow that 
designers use for an EFI setup? I know it's standard design to use 80-85% 
of the rated max flow. I'm concerned about choosing too large an injector. 
If it's too big, the injector might be so large that it can't turn on for a 
short enough time to run the engine at idle, by flooding it w/ too much 
fuel. So what's the standard figure for minimum injector output...5-10%? Or 
can injectors be shut off completely by the ECU. This I doubt...why would 
those 600hp imports use dual injectors to retain street driving? Thanks.

-ameer