Stock injectors capabilities?

[gadget73]

The later ECMs also have a considerably different pinout, so they are a lot more trouble to swap in. You can dig up the connector diagrams if you'd like but using the 93- mass air ECM requires moving 2 or 3 wires. Using a 94-95 requires moving about half of the connector around. It can be done, but its far more trouble to keep track of. That, and the other inputs you don't currently have wiring for and may or may not be able to implement.

[sly]

The ECM yes but not necessarly the cam. The ECM can be repinned with the lopo firing order. There will be arguments on this but I ask a Ford engineer in the programing and tuning for Ford if it would work with no issues and he said yes. Did it and drove the car for 4 years or more.

while true, the fact that two cylinders in the firing order are on the wrong bank according to what the ECM expects will make O2 trims get stupid unless you put no cats until post H-pipe and put the O2s in the H-pipe (keeping them as close to each other as possible) making the fuel trim work on both banks. Essentially tricking it into working like a batchfire O2 using SEFI. Without this kind of modification, you risk having one bank lean out while the other is rich as hell.

[90ltd]

while true, the fact that two cylinders in the firing order are on the wrong bank according to what the ECM expects will make O2 trims get stupid unless you put no cats until post H-pipe and put the O2s in the H-pipe (keeping them as close to each other as possible) making the fuel trim work on both banks. Essentially tricking it into working like a batchfire O2 using SEFI. Without this kind of modification, you risk having one bank lean out while the other is rich as hell.

Can i switch o2 sensors to fix it(right sensor in left bank and vice versa)? Or splice both sensors into one?

[pantera77]

So if i replace stock 14s with 19s will stock ecm compensate? With stock injectors I started running lean at 4k rpm when dyno operator stopped the pull. I probably could have gotten 160 rwhp which is stock auto fox mustang output.

What else is done to the car?

Why not just do a full proper HO/Explorer swap and not worry?

[90ltd]

What else is done to the car?

Why not just do a full proper HO/Explorer swap and not worry?

What I had done to the car: ho throttle body, bored out egr spacer bored out lopo upper, dual 2.5 exhaust no mufflers, no ac nor air pump. I plan to port runners 1 5 7, install slightly modified lincoln logs. On the running lean issue i wanna try 15 pound injectors from 4.9 i6 truck.

On the on the ho swap: right now I'm pretty close to gt output and explorer engine has the same torque so no go. One thing i noticed is that almost all parts add horsepower but not torque. __

[sly]

Can i switch o2 sensors to fix it(right sensor in left bank and vice versa)? Or splice both sensors into one?

no... swapping banks doesn't make a difference since half the cylinders are swapped, so that 2 bank 1 plugs fire on bank 2 so swapping them just switches which bank might lean out first. The solution I posted essentially makes them work as one O2 like on batchfire systems late 80s/early 90s EFI F150s. It's not a good solution either. The best solution would be to change the cam since the HO firing order is better for bearing life, or just swap an HO/GT40 engine in.. The easiest solution would be to tune the ECM for the 19# injectors. Something like a quarterhorse USB tuner would work, but you'd have to know how to go about tuning it. http://www.moates.net/quarterhorse-for-fords-p-199.html

[gadget73]

If the stock ECM cannot be tuned for more injector, and I really have no clue of it's capabilities, its possible you might be able to tune one of the HO brains to run with a different firing order. If you can change the injector size and all the other stuff, why not the firing order?

[turbo2256b]

The O2 sensors dont make a difference if you know injector order has been changed. Smaller or larger injectors can not be swapped with an ECM as its not the flow that is the issue with them not working. Atuner like the Tweecer there is a a app to change injectors, firing order, distance of O2 Sensors in case of long tube headers, change opening or closing of injectors, acclerator pump discharge squiter size, duration of squirt, A/F ratio WOT, load fuel maps, etc.
Over 500 or 600 things that can be changed wit ha piggly back tuner. I have 3 1" thick note books with all the info I could dig up. Not well oginized somer apps not completely figuured out. Spent 6 months compiling info figuring out what did what. Bottom line a carb is easyer cheeper to set up than a EFI system that dosent use a Wide Band O2 sensor. I would only go crazy with EFI again with a Hilborn individual TB set up.

[pantera77]

What I had done to the car: ho throttle body, bored out egr spacer bored out lopo upper, dual 2.5 exhaust no mufflers, no ac nor air pump. I plan to port runners 1 5 7, install slightly modified lincoln logs. On the running lean issue i wanna try 15 pound injectors from 4.9 i6 truck.

On the on the ho swap: right now I'm pretty close to gt output and explorer engine has the same torque so no go. One thing i noticed is that almost all parts add horsepower but not torque. __

I have that + more done to my lopo and have no problem with lean issues on 14#ers (though I've never had it on a dyno)