How to "tune" a "set" RRFPR

[douglas vincent]

So, I am running a 3-1 rising rate fuel pressure regulator. This worked great for up to 16 or so psi combined with the 550cc injectors. 16 * 3 = 48 psi + 43 = 90ish psi fuel pressure. When you combine this with stock 550 injectors, they come out to be 800 cc equivilents.....

But, when I modified the 550s to be 820s, and raised the boost to 22 psi, my fuel pressure jumped to about 110 psi! This makes the 820cc equivilent to 1300 cc injectors!!!! WAY TO MUCH.

So I pulled ALOT of MAF signal.... This helped but, still ran way way rich.

I didnt want to pull out the rrfpr, just get it to run less.... What to do, what to do....

So I installed the extra Greddy Manual Boost Controller I had in the vacumn/boost line to the rrfpr! Then I was able to simply turn down the boost signal till I got a better fuel rate. Pretty simple cure!

[gto7419]

Have any pictures of the setup and how you ran the lines?

Danny