Quoting 4thStroke:
Brianawd runs a walbro 255 in tank and an 044 inline, he maxed out his 3052 at 561awhp on 1600s and more fuel to spare.
Your fuel pump configuration will affect duty cycle as well. Running 2 pumps parallel will keep the IDC down, where as two pumps in line will run up the IDC higher.
I would say a wine bro 255 with a 044 inline would support more hp then a parallel 255 setup in tank. If you ask me high boost small motor cars need A LOT of fuel pressure, but not A LOT of fuel flow to make power. If you run a base fuel pressure of 40psi and 40psi of boost you need a fuel system setup that can support 80psi or fuel pressure, and injectors that are big and running high duty cycles.
I had an Aeromotive A1000 fuel pump last year, and the fuel pressure would drop to high 60's during the run on the dyno. The way it works is at 0psi manifold pressure, ie atmosphere pressure, the motor takes this much fuel to make this much HP. Now add 1 bar of boost on that same engine, and the same A/F ratio needs twice as much fuel. And what ever boost you run that intake manifold pressure is trying to push that fuel back into the injector, thus the need for a rising rate fuel pressure regulator.
And its now its not a surprise the twin in take winebros do not work as good as they should. Because for the most part our high boost cars need more fuel pressure vs mass flow, which a twin winebro setup does not move A LOT of fuel at 40psi base fuel pressure, and as pressure increases flow decreases.
~John