I see alot of talk about a good or normal fuel pressure to be around the 40-42 psi range. I've got a TA49 with 009 injectors, a hot wired Walbro 340 pump and a Jay Carter street chip. On the street with 93 pump gas and about 17 psi boost, I only need to run 32 psi for O2s in the 780-800 range. Does this sound acceptable or is my fuel pressure gage wrong? BTW, at the track with 111 octane, 22 psi boost and a Jay Carter strip chip, I run the fuel pressure at 41 psi (same gage) for good O2s.
With the bigger injectors, it doesn't take as much pressure to push the same ammount of gas. Just tune to your O2 numbers, the way you are right now. Also pay very careful attention to knock on your scan tool.