Originally Posted by
ForcedMost efi fpr are rising rate including your stock unit, the reason for this is more a case of "equilibrium" than a "tuning band aid".
For instances most regulators are 1 to 1 ratio meaning that they add 1 psi for each psi of boost. This means if your boosting 20psi and you are using a base pressure of 43.5psi then your fpr should show 63.5psi. The pressure regulator is increasing the pressure of the fuel so that it can overcome the charge in the intake manifold. If the regulator was not a rising rate unit and you decided to boost 37psi with a base pressure of 43.5psi ( which is usually around 37psi with the vacuum hose on) your injectors would have a very hard time overcoming the air pressure in the intake manifold and most likely would not fire at all.
One question though that I'm still not sure of. Do the DE and DET engines use the same fpr? When I installed my turbo on my de, I was under my own assumption that the de was vac operated, and the det was psi operated. So when I bought my 370 injectors, I bought a set with the stock fuel rail and fpr off a det.
So did I assume correctly? Or are they the same unit?