Fuel help you guys

[91GTturbo]

Originally posted by kenneth kimble
Thanks in advance! This is going to be long. Please bear with me. I am using a 14# procharger system on my GT. the fuel system consist of factory intank pump, a 190 pump supplied with the kit. Accel fuel pressure regulator set at 45 psig at idle no vac - ford blue 24lb injector and the adjustible FMU supplied with kit. 73c&l air meter. I know the injectors are to small for this application and the fuel system will see very high fuel pressure (+80psig) trying to make up for their size. I played with the analyzer on this site, using 450 to 500hp as a bench mark and came up with 38 to 42lb injector as the size to use. I want to run a fuel system without the FMU and High fuel pressure spikes. I've been told by another mustang guy, not to use the 38lb injectors, because I will suffer driving problems with the 38lbs. Its not a daily driver but the car may have to be so it must have good street abilty. Has anyone used the 38's and ran into problems with street ability. For the rest of my combonation 306 TFW track heat heads X303 cam and tunnel ram intake 3.55 rear.

I haven't heard of any specifics about driveability problems with 38's, it usually the 42's people have problems with. Once the car is up to operating temperature, if you cut the car off, the 42's flood the car and make it hard to crank. Usually holding the gas pedal to the floor while trying to crank it will work for getting it recranked, I guess 38's could have the same problem. I run 30's with my setup and no fmu. As long as you have a regulator that will increase fuel pressure as you build boost, you'll be fine (assuming the injectors and fuel pump are big enough to supply enough fuel). My 30's are leaning me out and I'm only running 6-8 lbs of boost right now. I only have an inline bosch fuel pump to go along with the injectors. I've just been to lazy to pull them off and switch fuel pumps. I'm going with 36's and no fmu when I get motivated enough. Plus I would look into changing from a C&L meter to a Pro M meter. They seem to work much better on forced induction cars. Whatever injector size you go with, a custom burnt chip for your application will solve any problems you may have with the injectors.