i dont think there is any "poor math" i think it is just the nature of the beast. the pump in question here is cam driven. what that means is it can only do so much, based on your engine RPM. the higher you rev, the more fuel it can supply. thats why the pressure loss is seen in the low/mid range during boost spool-up. the ECU knows how much fuel pressure is available in the rail and will determine how long to hold each injector open based on that pressure. the stock pump runs out of steam HARD on increased boost levels, and even stock boost if the temps get low enough. my car on high boost in the cold had horrible pressure drops in the mid range during spool up. the PG/MRLILGUY cdfp helps out a lot with this issue. this pump allows more fuel pressure to be made across the full RPM range. sure there is still a drop in pressure, but it is stays at least 400 psi higher during those same conditions. it is much faster to " catch up " after the dip in pressure too. i had my MBC set very aggressive the other day at the track and forgot to turn it down for the drive home. i was holding 26PSI in 5th gear !! i data logged a pull from 3k RPM up to 6500 with boost holding 26psi dropping to about 20 at 6500. there was a small dip down to 1390psi fuel pressurebetween 3200-4000RPM after that the prussure stayed above 1600psi. the AFR's were also in the low 11's-high 10's !!! the pump works, there is no question in my mind. i think anybody with lots of mods and/or raised boost would be a fool not to have one.
