I need help on selecting the size of injectors for my 03 5.4 expedition. the only mods i have made are, k&n intake, superchips programmer, removed cats, installed flowmaster 40 series. The reason to wanting to go with bigger injectors is that i recently ordered a bbk power plus 75mm throttle body, and shorty headers. I'm thinking bigger injectors will help alot, any input would help.
What are the stock #injectors for an 03 expedition 5.4
- Thread starter a7907
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You currently have 19#ers (Orange top) installed. No need to upgrade for the mods you mentioned. But if you add a supercharger or other power adder, you will need to go at least up to 42s (Green top). If you have any doubt, measure the injector pulse width with a scan tool, and if you hit 90% ON TIME, it is time to upgrade the injectors and the pump.
Nice ride BTW!!!
Nice ride BTW!!!
Hey thanks a lot. I knew someone would know. I just bought a nitrous dry system from zex for efi. I got it real cheap thats why i bought it so im thinking of installing it with just the 75 hp jet that way i dont have to mess with the timing. In that case would i need to upgrade to the #42 injectors?
That would be wise, but collect data first. Once you see a 90% ON TIME you will need larger injectors. But beware, the Nitrous system (If it is a WET system) will inject the needed fuel, and you will not need to upgrade the stock injectors.
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