i ahve a 95 F-150 with the I-6, what was all the talk before about increasing the fuel pressure to the stock injectors for the availability of horsepower. where and how is this done.

 

You need an adjustable fuel pressure regulator. Several companies make them for the EFI 300. Mine is a Crane and has served me well for about 3 years. Unfortunately, most have an upper limit of 60 psi which is only 1 psi above stock. This can be remedied by chucking the adjustment screw in a lathe and cutting down the head a little bit. On some models it is also possible to cut down the regulator where the screw threads in to allow more adjustment. Even with those tow mods I was only able to get about 65 psi out of the regulator. The better fix is to run larger injectors with less pressure, but that will likely cause a rich condition on the low end.

 

 

thank you for the help, by chance did you feel much of a difference in power though?

 

I really didn't get much power from the conversion. What I did get was better throttle response and about a 10-15% decrease in mileage. 2 years ago I did some back to back testing at the track with the stock injectors and 24 lb injectors. With the 24's I ran a 17.58 @ 73 and with the 14's I ran a 17.65 @ 72.??. I have since run a 17.48 with the 19's in much better air and with a limited slip rear end, and a 17.13 after replacing a PIP sensor that's been bad for a while. I've probably swapped injectors back and forth from stock to 19's to 24's and back a half dozen times and the stock ones have run right along with the larger injectors consistently. As for the mileage, my O2 sensor has about a 100k miles on it, 20 of which were with a set of 42lb injectors accidentally installed. In other words, the sensor is probably junk. I've got a new one to install, which might pick the mileage up considerably. Even if the mileage stayed the same I don't think the swap is worth while on a stock truck. By the time you by the regulator, injectors, etc. and do the swap you could have $150-200 invested if you do the work yourself. IMO there are better ways to spend the money, such as headers/exhaust or an MSD. I have headers, ram air, ignition and endless tuning and they were worth about a tenth in the 1/4 mile which is probably about 5 hp in this application. On a stock truck why bother with 5 hp when the same money can get you 20 spent elsewhere.