I've heard the NB run at 60 psi (and that's what I used) but I've never had one or seen a friends car with fuel pressure gauge installed - so I am just guessing.
The NA Miatas run around 43 psi fuel pressure stock (IIRC 40-46).
So the formula is injector_actual_fuel_flow = sqrt( actual_fuel_pressure / injector_rated_fuel_pressure) * injector_rated_fuel_flow
RC Engineering rate their injectors at 43 psi (probably like most of the other manifacturers)
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