Originally posted by HoosierContour:
So with that equation, 240hp * .45 / 6 cylinders *.8 duty cycle = 22.5 lb injectors. or should use 24 lb injectors.
So 6 cyl * 19 inject * .8 duty cycle / .45 = 200 max HP w/o increasing Fuel pressure.
My interpretation....
Yep. That exact math is what started my investigation into whether or not I was maxing my injectors, and that investigation ended with my dyno experience and installing 24# injectors. FWIW, last time I dyno'ed (4 months and quite a few problems solved ago) I peaked at 188 fwhp (~215 - 220 give or take at the crank) and that peak occurred exactly where my fuel curve fell off. So the math isn't exact (because of the BSFC estimate, mine must be slightly lower than 0.45, which makes sense since I run increased compression) but it is a theoretical start. When you back that up with hard data, it is tough to ignore the correlation.
Along the same lines, if you find a way to increase your fuel pressure (which a few people have tried and failed, including myself) then you increase the "effective" flow rate of any set of injectors (from the same topic by Terry that Hoosier posted). It's exactly how Vortech gets the additional fuel into the motor on their S/C application, and why returnless can't work with a Vortech (different fuel pressure control system: returnable - mechanical vs. returnless - PCM controlled). However, you CAN use a chip to boost fuel pressure on a returnless system.
