Just wondering what fuel system mods people have to have that are running around 12 psi.
Thanks!

 

For me I only hit 12psi in 4th and maybe 3rd, but my fuel mods are as follows, FD Fuel pump, 1st gen S-AFC, and Chevron 93 with Techron....but I'm still not confident with that FD pump gonna upgrade to a walbro, and prolly get a 2nd gen S-afc cause of all the goodies on them, mine just has **** for the rpm range

 

You really need an injector upgrade...

For 12PSI, on a TII, my personal belief is that a safe system is as follows:

-720 secondaries
-upgraded fuel pump (FD, etc.)
-S-AFC to control it all

Planning to go to 12 PSI this spring, at which point I'll be installing some 720s.

 

well I always understood the 550 injectors will flow plenty up to about 13 to 14 psi, and if you have it corrected with an s-afc and fuel pump, now to be extremly safe 720 secondary would compensate for boost creep/spike, but a car tunned with 550's and a ported wastgate with stock turbo at 12psi would be the best, for dirvablity its good to have all the same size injectors, and if you notice everyone with 720's turn them way down on the s-afc, just about the same as give the 550s more flow, I belive Ted will back me up, he mentioned something like this before

 

but in your case, prolly would run 720's due to higher compression.........

 

I wasn't confident it raising the boost hardly at all until I had all of my current fuel mods:

FCD
Walbro
S-AFC
720cc secondaries

 

I guess I'm just the stupid guy that likes to play with fire I ran a solid 11-12 pounds daily for 3 months with the only fuel mod being the walbro 255lph fuel pump. I watched my EGT like a hawk. The highest indicated temp I got was about 800 degrees at the top of 4th. Probe is located right behind the stock o2 sensor. From searching around this is just barely stoich.
Never the less this is cutting it close, and if you play with fire long enough you will get burned. When I put my TID/filter on I finally decided the baby wastegate had to go. Now I'm running a solid 7-8 pounds maybe creeping to 9 for a bit before running back down to 8 in fourth. Stock catback is killing me. Obviously my only fuel mod is still the walbro. I plan on some 720 secondaries and a SAFC soon though, and then I'll finally open up the rest of the exhuast and get some kind of cheapie EBC (profec b anyone )