Hi i'm just curious if someone could point me in the right direction for upgrading injectors or tuning what i got.
first off, my truck is bone stock as far as i can see and read as i am its 6th owner and want to invest in my truck a bit. i was looking at 2005 4.0 mustang upgrades and saw some injectors for 78 lb/hr and started wondering what stock output even is before i throw ANY parts into it so i know what im gaining. Secondly, does anyone know any good tuners to hook up i have a scan gauge 2 in my obdII port at the time and just thought of swapping it out for a tuner for mpgs and/or power.

Thanks

 

Welcome to the forum

Larger injectors are not needed, or helpful, unless you seriously augment the air the engine can used per intake stroke.
i.e. super or turbo charger
Porting or different air filter does qualify.

Tuning the computer is good, you can make it best for your style of driving.
No car maker "detunes" any engine, they just tune it for best power and best MPG in mind, and they also have to pass emissions for that year.

14.7:1 is the air:fuel ratio for gasoline, this is a WEIGHT ratio,
14.7 POUNDS of air to 1 POUND of gasoline
14.7 grams of air to 1 gram of gasoline

This is why injectors are rated in POUNDS per hour.

If you add more gasoline you get a Flooded engine, if you add more air you get Lean/pinging engine
So to get more power from any engine you first have to add more air, usually by SHOVING IT IN, lol, i.e. BOOST, and THEN adding more gasoline to get the 14.7:1 ratio
A 5.0 LITER engine has more power than a 4.0 LITER engine because it can use 1 LITER more of air every 2 RPM, so use more air get more power

Computers main job is to make this ratio happen, keep the engine running a good mix.
So computer is programmed with that engines fuel pressure and injector size, so it can calculate how many grams of fuel will flow out of each injector in say 100ms(milliseconds)

If you install larger injectors but don't "tell" the computer, then it will set a RICH code, you don't get extra power, just the code.
Because computers calculations are off, so to keep air:fuel ratio correct it doesn't open the larger injectors as long, and thats what a "rich code" means, "lean code" means injectors are having to be opened longer than calculated.
At no time was the engine ever running Rich or Lean


No, don't know any tuners, check speed shops in your area they will know some