S13 sr20T28 15lbs550'sZ32 mafSafc II I tuned the car myself with a wideband and it isn't my first one. Before I get an ear full about the Safc tune it's what I could afford at the time and I know there's better ways. Question is my air fuel was pretty steady under normal driving before the injectors. Since I installed them and that's the only thing I did the a/f seems to roam 11-15 without change in throttle position. Some days it acts normal and some it varies. It didn't do this with the stock injectors so my only guess is I need a fuel pressure regulator.?? Any ideas? Under full throttle the car holds a steady a/f. Separate question unrelated but a long time ago when the car was on stock turbo and boost I hooked the the Safc just because I was bored and used it for monitoring till I got mods and the knock reading was normal after start up. Drive for thirty minutes and the knock would read 140-150 but if you turn off the car but leave the ignition on and watch the sensor reading it still shows a reading of around 120 with the car off. So I need a new knock sensor correct? The problem still exists today and it's just bothersome to not know for sure. Thanks for any help