s2kjb

my friend was tellling me that when i upgrade my fuel injectors that im going to need an adjustable fuel regulator. i have the vortec fmu on my vortec now and im upgrading to a smaller pulley, injectors and ems. i thought that the ems would be able to control them. just looking for some input.

OGPackin

Not true bro. You do not "need" a fpr when upgrading fuel injectors.

deathsled

well, the vortech FMU is a bandaid for people who dont have larger injectors. If you're finally upgrading them then ideally you will want to remove the FMU and either use the stock FPR or get an aftermarket AFPR which is not a rising rate regulator like the vortech unit. Hopefully your new injectors are large enough to flow enough fuel at standard base pressure (49psi?) without needing to increase fuel pressure 12psi with every lb of boost like the vortech one does.

s2kjb

well I have 750cc rc injectors. I'm not sure if they increase the pessure or not but I still have the stock fpr. but you're saying remove the vortec fmu? and run just the stock fpr.

ScienceofSpeed

Rising rate fuel regulators supply fuel demand for forced induction by way of stepping up pressure.

Stand alone engine management systems allow you to retain stock fuel pressure and supply fuel demand by way of larger injectors being pulsed by the EMS appopriately.

If you are using a stand alone engine management system, you should remove the Vortech FMU and leave the stock FRP in place (it is retained on the stock fuel rail with the Vortech kit). This will keep a constant fuel pressure on the fuel rail and allow your EMS to supply fuel by pulsing the injectors to the proper duty cycle.

Cheers,
-- Chris

s2kjb

thank you guys