The ecu does not control fuel pressure directly. If its hooked up to a VSV valve is ecu controlled to run base pressure to prevent gas lock at startup and what not. And yes it is an rising rate fpr
When I ran my Lexus and 550 injectors, I was running 15psi with more than enough power for the street. I had a friend running 18psi on the same setup. Google search it more, its a really nice write up.
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