IF standard psi on the tbi is 9 to 12 psi, with the edelbrock perf ( carb non egr ) intake and 350 injectors, how much pressure should be enough?? any suggestions? I've been trying to tune with the o2 sensor, and the readings dont seem to change. What am I doing wrong??

 

Adjusting fuel pressure on a stock TBI engine really doesn't make any difference.

The only time you'd wanna mess with it is if you were going with a high PSI setup, Pablo has spoke of this before..

The computer will compensate for any changes in volumetric efficiency to a point, you will not reach that point with an intake swap.

 

there is no set pressure for you, you have to test it. Its like asking us which shoe will be the most comfortable for you. Youll need to go to a track and play with the fuel pressure some and look at your trap speeds
if your cam is stock dont expect needing alot more