It really is irrelevant for returnless or return style. The rating by the injector designer can be at any pressure differential but the software in the car will calculate flow delivery based upon pulse width and pressure.
The only requirement is that the pressure be kept within an acceptable range so that injector spray pattern remains as intended.
Former owner of '99 CSVT - Silver #222/2760
356/334 wHP/TQ at 10psi on pump gas!
See My Mods
'05 Volvo S40 Turbo 5 AWD with 6spd, Passion Red
'06 Mazda5 Touring, 5spd,MTX, Black
