Anyone experiment with larger injectors on SD system? (Adding displacement)
I have a 5.0 SD setup on my F150 (and my 87 Stang), and I want to increase the engine size from 302 to 408. I know the biggest thing with SD is keeping the idle smooth, then everything should fall into place just fine so long as I can increase the fuel to match the increase in air...
If this works on my truck, I might just do it on the Stang too... It won't kill me not to run a lumpy cam on a purely street driven car if I have the cubes to make it go.
The truck has an electronic transmission that is not supported by any factory MAF system, so without going to an expensive Baumann controller stacked on a MAF ECM, it pretty much has to stay SD.
Anyway, if I run larger injectors, will the SD ECM run them just like the stock 19s, but since they are larger injectors, they will add more fuel???
I know this seems overly simple, but it sounds reasonable. Am I missing something?
I did the math, and if you enlarge the 19# injectors by the same percentage as the increase in engine size, and I come up with 25#s. So, if my theory holds true, 24s might just work. Assuming that the injector rating means that they add that much more fuel with the same signal received from the ECM as compared to the 19s.
1987 GT 5.0/T5/3.55 [My Toy]
1990 F150 Lariat 5.0/E4OD/4.10 [My DD]
1981 Fairmont Futura 5.0/T5/4.10 [Son 1]
1994 GT 5.0/AODE/4.10 [Son 2]