Originally Posted by Programbo

Hello. When I started selling injectors to make a little side money I figured I better run them in my own Jeep and see what they do so I can know what I'm talking about. So far I've run all the most common "upgrade" ones plus a few others. I generally run the same 300 mile course on weekends. If anything odd happens or I get really out of line results I'll do it again with the same injectors to be sure. Anyway....
I've found any of the more common upgrade injectors are much better than stock XJ ones in all areas. You'll get a smoother running engine, quicker throttle response and a bit higher MPG. Now I know some will say this or that injector puts out this or that flow or you need this or that fuel pressure regulator for them to work but my own (I'll admit far from scientifically perfect) tests have resulted in me getting pretty much the same performance/MPG with them all. And changing the FPR (fuel pressure regulator) with the Ford "yellow stick" 710's from the 39psi to the 49psi one didn't really change much. Again not for my XJ at least. Although I did lose some City MPG with the 49psi FPR. I got the best MPG Highway with the EV1.3 Neon injectors which look exactly like stock XJ injectors but have 4 holes closely spaced together.