Hahn seems to be wrong IMO. I run a solid 13 psi, with the 310's. My fuel pressure is over 100 psi, and i get decent A/F numbers and EGT's. My fuel pressure gauge only goes to 100, but the needle gets pegged when i hit 13 psi. I hate tuning to fuel pressure anyway. I look for A/F ratios, and EGT's mostly. Dont be concerned with what pressure its at. Be concerned with your EGT's and A/F numbers. IMO, 15 psi is too much for these injects. YOu can do it, but its REALLY pushing them. If you run some race gas, then 15 psi would be fine. Stay at 13 psi IMO. I'm hitting around 230 WHP @ 13 psi, and that seems to be very close to the limit of the 310's. Its just safer that way, to not beat the shit out of the injects with 120 psi of fuel pressure.. Dont you have the S20G turbo also?? If thats the case, then you shouldnt run much more than 11 or 12 psi on the 310's...What do your EGT's look like? With the proper amount of fuel, they should not go above 1525 really.. I use the largest disk in the SFMU, about one to two turns out on the bleed valve, and the long, silver spring in the SFMU. I run about 21-22 psi of fuel at full idle, and at 13 psi, its prob around 110 psi of fuel.

13.5 @108 MPH-2.2 60ft(stupid FWD!)
S16G @ 18 PSI/FMIC/Running on MegaSquirt II (Now with sequential
fuel injection)
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-1998 Mitsubishi Eclipse RS-T- "Toy"
-1992 Plymouth Laser Turbo AWD(SOLD)
-2000 Honda CR-V(daily)