let's bring back this oldie, but goodie.
everyone says, including Karl and Stu in this very post, that YB's have
rising rate fuel pressure regulators. they are saying that the fuel rail pressure is increasing with manifold pressure to produce a constant pressure difference across the injector.
well
this site describes a rising rate regulator as
A RISING RATE (RR) FPR has a ratio greater than 1:1, eg 2:1, 4:1. and will increase fuel rail pressure after a certain boost point eg 12 psi and upwards. The rising rate reg will ensure rail pressure rises at a greater rate eg 2x, 4x with boost, and injectors will flow more fuel. In this case the net effective fuel pressure would be greater than the standard 3 Bar. Rising rate means fuel flow rises at a greater rate than manifold pressure. A RR FPR is suitable to increase flow from smaller injectors (to a point), or, for the case where a manufacturers non programmable computer can't compensate for big injectors at lower rpm's.
i don't know one way or the other as i have never put a pressure gauge on my fuel rail. i'm sure that Karl and Stu have, and therefore know exactly what the FPR is doing and how it works and i'm sure that what they have said is true.
we then have the criticism of IMA's FSE. this may well be the wrong device for doing it, but surely a rising rate FPR is a useful thing to have?
wouldn't it make sense to increase the fuel pressure at a greater rate than manifold pressure so that on boost the injectors become capable of flowing more? is this how the NMS "Gunship Stage 1 conversion" works, or is that done by an increase in the base pressure setting?
provided the fuel pump can produce enough flow at the higher pressure, is there any reason not to use a truly rising rate fuel pressure regulator? would this not be a cheap and easy way to produce more power than std injectors can normally make?