Changing fuel injectors 5.4 L
 

Has any one changed injectors from the stock flow to a higher flow rate? From what I gather the stock rate is 19lbs/hr. The extra horsepower I expect to make calculates out to about 26-28lbs/hr for the flow I need. Can I expect any horsepower gain/throttle crispness from just replacing the stockers before the mods start? How about tuning the engine with a tuner?

Dont change injectors unless you are supercharging and only do that once it is supercharged. Do your fuel system and injectors at the same time as an install with the s/c

In searching and reading what I was told the stockers should be fine till the power level goes up from mods (heads/cams/etc.). Found a lot of math to calculate sizes. An increase in pressure would be mre help now. I'm gonna get a reprogrammer for an axle change so I'll add a bit of fuel too. obtw no supercharging is in the future. Never have and never will.

then u will be fine with the stockers .. maybe, and i mean maybe change out to 24 lb when u do a heads/cam swap with a ported intake ...

I've started taking the inlet/exhaust restrictions out and max tuned it on 93 octane. I've done 0-60 times using stock A/F @ W.O.T. then went to 10% richer setting and no diff at all. Am I reaching the stockers limits? I'd like to change to 24's for the better spray pattern at least. obtw the mpg's went up 20% (2.0mpg) with my foot in it.

I switched to 21lb. units for the heck of it. I thought I'd try Accel and it has a crisper throttle response than before. Might just be the spray pattern? It was worth it to me for the money spent. I changed the values in the tables to match them also.:pimp:

There are no gains to be made with fuel injectors alone. Kaboom, what are your plans for the truck? Is it a pi or non pi motor?

It's a PI engine being a 2002. I've been tuning on the MAF transfer function table to bring F/As in line.:bomb:

Had much luck?

oh and what are you using for tuning? Tweecer? SCT?