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Originally Posted by BAN SUVS
Remember, the max flow rate for an injector depends on several variables- max duty cycle, gamma on time, and fuel pressure. Injectors are like the spray nozzle on a garden hose. Max flow is determined by how fast you can squeeze it off and on, how big the hole is, and how much water pressure you have. If the faucet is only turned on halfway, you get less flow than if it's all the way on, even though you are opening the same nozzle with the same frequency and duration.
Stock fuel pump = faucet half open.
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All true, except for that thing called a "fuel pressure regulator" that ensures there's a linear mapping of MAP to fuel pressure.
You only need a bigger fuel pump when your injectors are able to draw more fuel than the pump can provide, which in turn means a drop off of pressure at the rail below what the FPR is attempting to regulate to.