[axsaxoman]

very complicated to spec injectors exactly --apart from the fact that different companies test their injectors with different viscosity fluids --which will make a big difference in what the quoted size is .

the formulae quoted above must always be taken as a guide --not gospel ,the way your head burns the fuel --ie how it scavenges will make a differnce as will alot of other things ,and once you start adding accel fuelling in as well ,and how rich you want to run the engine --it all makes it a bit hard to use any formulae as gospel ..
rasing fuel pressure will also have a big effect not only on flow but of the atomisation ,especially at low engine powers. clio 182 --does notsuprise me at all that the injectors are not as big as some think --
smaller they can run the better it will be for emissions at low rpms .changing from 3 bar to a 4.5 bar reg will usually give you another 12-15% --but again this is only a rough guide