matty

What does upgrading the fuel pump do exactly? What's the benefit?

Currently, i am seeing anywhere from 85%-93% injector duty cycles via the power fc. I would like to upgrade the intercooler eventually but before doing so i hear that i need to upgrade the fuel system. Especially if i want to turn up the boost past 12llbs. My current mods are full exhaust, intake, and power fc with some minor tweaking by dave @ kd rotary on the dyno...my a/f is a solid 11.4 up top.
Do I also need to look into bigger secondary injectors? Or will upgrading the fuel pump be sufficient?

Thanks for the help,

Matt

Mahjik

iTrader: (1)

Upgrading the fuel pump isn't going to change your injector duty cycles, you'll need to enlarge your injectors for that.

Usually once enlarging the injectors, then people upgrade their fuel pumps to have a better flow to the larger injectors, however even that is debatable depending on how much boost you will be running.

matty

where do i get an rrfpr?

jspecracer7

RX7Store make them?

I agree with Rikki...The Nippondenso pump is what I have, and it's awesome. Worked in my buddy's T-04R powered FD, and no fuel problems until he turned his boost past 1.0 kilos. That's ALOT of fuel!

matty

almost twice the cost of the wharlpro (sp).
Once i get the rrfpr anf the fp can i turn up the boost w/o an intercooler..my mods are in first post....also i am guessing that i need to have my power fc retuned

jspecracer7

Walboro will do fine. Definitely get that before you boost up/intercooler.

...and yes, the PFC will need to be retuned.

mjw

iTrader: (1)

The stock FPR is not a RRFPR? Also, Ryan and all you other guys with adjustable regulators how did you go about installing/mounting them? I am guessing I will have to fab up some -6 line and get some earl's fittings to make it work.

Matt

rotorbrain

if you have a pfc then you shouldnt need an rrfpr, right? since all you have to do is change your settings via pfc and tune a fpr to higher pressure then it should not be needed. at least thats the word on the street. hehe. am i wrong?

mjw

iTrader: (1)

Well yes and no, an adjustable regulator allows adjustment of idle fuel pressure.. a rrfpr will raise that fuel pressure a given rate per psi. Most common are 1:1 rrfpr, so for every pound of boost you get one psi more of fuel pressure.. and so on. Raising your base fuel pressure can allow you to lower your injector duty cycle, and thus allow you to adjust accordingly via the PFC, but just because I have the PFC does not mean I don't need a rrfpr. Basically all I am curious about is what is needed to do the install, and seeing as the stock FPR is not adjustable it would be a waste of time to go in there and install a new FPR that was not rising rate.

Matt