Another dumb ECU question
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Senior User
Joined: Apr 2010
Posts: 324
Likes: 1
From: San Tan Valley, AZ
Another dumb ECU question
I am going through the maf conversion on my '93 5.8l e4od 4x4. The only ecu i can find is for a Carb (california) emission truck. Does that even matter? Am I being too picky? Any advice would be helpful.
How can I tell of I need bigger injectors? Any easy way to tell?
If I'm going to do it... I'm going to Over do it!
How can I tell of I need bigger injectors? Any easy way to tell?
If I'm going to do it... I'm going to Over do it!
Elder User
Joined: Jun 2010
Posts: 641
Likes: 0
From: TX
I am going through the maf conversion on my '93 5.8l e4od 4x4. The only ecu i can find is for a Carb (california) emission truck. Does that even matter? Am I being too picky? Any advice would be helpful.
How can I tell of I need bigger injectors? Any easy way to tell?
If I'm going to do it... I'm going to Over do it!
How can I tell of I need bigger injectors? Any easy way to tell?
If I'm going to do it... I'm going to Over do it!
Umm... the stock 19lbs. injectors are good up to about 300hp. Bigger doesn't mean more power if the engine is stock. Just keep that in mind. What kind of hp do you want get with your engine?
FTE Legend
Joined: Jun 2006
Posts: 31,930
Likes: 1,499
From: Ottawa, Ontario
Doesn't matter where the EEC comes from as long as it's for a 5.0 or 5.8 with the E4OD. Injector size is directly related to how much air the motor moves and that depends upon all the components in the engine combo... intake, heads, cam, exhaust.
Thread Starter
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Senior User
Joined: Apr 2010
Posts: 324
Likes: 1
From: San Tan Valley, AZ
The engine is upgraded, but to what extent I don't know. What I do know by having to switch certain things out is
- Speedpro 1.6 rockers
- Eagle 'H' rods Eagle Specialty Products 5956F3D - Eagle ESP H-Beam Connecting Rods - Overview - SummitRacing.com (stamped cap #)
- Heads World Products - WINDSOR SR. Iron Heads (maybe)
- Scat stroker crank- unknown model, Scat for sure (maybe lazer etched)
- JE Pistons- unknown model (before je and wiseco merged)
- Cam unknown type and model
I got this motor for dirt cheap, barter work actually. The motor was built, probally over ten years ago (old age, bad memory). The builder doesn't remember if it was for a sprint car, or a Bronco project he never got paid for. But it was built right. Lets put it this way; over building might come close to what he does!
The headers that I took off the motor look to be for a 60's Bronco, so i'm going with that.
P.S.- I can't figure out how to add pictures to my post, but I have alot of pics with the motor in my profile page.
- Speedpro 1.6 rockers
- Eagle 'H' rods Eagle Specialty Products 5956F3D - Eagle ESP H-Beam Connecting Rods - Overview - SummitRacing.com (stamped cap #)
- Heads World Products - WINDSOR SR. Iron Heads (maybe)
- Scat stroker crank- unknown model, Scat for sure (maybe lazer etched)
- JE Pistons- unknown model (before je and wiseco merged)
- Cam unknown type and model
I got this motor for dirt cheap, barter work actually. The motor was built, probally over ten years ago (old age, bad memory). The builder doesn't remember if it was for a sprint car, or a Bronco project he never got paid for. But it was built right. Lets put it this way; over building might come close to what he does!
The headers that I took off the motor look to be for a 60's Bronco, so i'm going with that.
P.S.- I can't figure out how to add pictures to my post, but I have alot of pics with the motor in my profile page.
Elder User
Joined: Jun 2010
Posts: 641
Likes: 0
From: TX
Well if the motor is built right you could upgrade to 24lb. injectors. That's good to maybe about 400hp. If you think it makes more buy the next size. I believe 42lb. injectors are for over 600hp. Well to post pictures just upload your pics to your album after that click on the uploaded pic and get the BB code. Then just post that code and that's your pic.
FTE Legend
Joined: Jun 2006
Posts: 31,930
Likes: 1,499
From: Ottawa, Ontario
What you need to know now is the displacement and the cam specs, and you don't need to tear the motor down to get those numbers. You can measure bore and stroke with the oilpan off, and by attaching a degree wheel to the crank and dial gauge to one of the lifters(or pushrods) you can measure the cam. Then we plug those numbers into something like DesktopDyno and you'll have a pretty good idea of the engine potential and injector requirements. My guess not knowing any specs is it will need 24-30lb squirters but who knows.
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Senior User
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From: San Tan Valley, AZ
What happens if the injectors are too big? Does the ecu not shorten the pulse if running too rich? ie. put less fuel in the motor?
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Thread Starter
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Senior User
Joined: Apr 2010
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From: San Tan Valley, AZ
I just picked up a maf setup (intake tube, airbox, mas, etc.) off of e-bay and am converting it slowly. Waiting on it to slowly get here!!! The only thing I don't have is the ecu. I have yet to even fire the motor in fear of leaning it out, burning something, and maybe a little fear itself. Just had to have a custom exhaust done, due to the pan being in the way of the stock y-pipe.
I was thinking about 30lb. injectors. I was hoping that this motor might hit 400 to 500 horesies. I can hope can't I?
I do know that it's a 393, if that helps.
I was thinking about 30lb. injectors. I was hoping that this motor might hit 400 to 500 horesies. I can hope can't I?
I do know that it's a 393, if that helps.
Elder User
Joined: Jun 2010
Posts: 641
Likes: 0
From: TX
Sounds good a little more doens't hurt anything. I thought that ford racing 30lbs. were orange lol. Wow 400-500 range sounds powerful. Are you gonna be making that power with the engine naturally aspirated or are you gonna add some turbos? Lots of parts are interchangeable I am sure it would work. Have you found your computer yet?
I'll be following this topic as it contains MAF conversion. I so want a 351.
Keep us posted.
I'll be following this topic as it contains MAF conversion. I so want a 351.
Keep us posted.
FTE Legend
Joined: Jun 2006
Posts: 31,930
Likes: 1,499
From: Ottawa, Ontario
OK.. first thing you have to understand is that all Ford MAF truck EEC's(except the 460 version) are programmed for 19lb injectors so that is the only size that will work correctly and produce the expected results. You can use larger injectors but you have to do one of two things...
A) Use a matched injector/mass air meter pair that are "calibrated" to mimic the stock parts.
B) Get a tuner and change the EEC calibration data so it knows exactly what injectors are being used, the trasnfer function of the MAF meter, and the actual engine displacement.
The first option may or may not produce acceptable results because the EEC is still doing calculations based on 302 or 351 cubic inches..not 393. As a whole this motor will move a lot more air than a stock one so it's fuel requirements will be vastly different, so I don't think this is really an option, I don't think you'll be happy with the results. The second option definitely will do what you need.. once you learn how to tune, but it's what I think you're gonna need to make this motor work the way it should.
A) Use a matched injector/mass air meter pair that are "calibrated" to mimic the stock parts.
B) Get a tuner and change the EEC calibration data so it knows exactly what injectors are being used, the trasnfer function of the MAF meter, and the actual engine displacement.
The first option may or may not produce acceptable results because the EEC is still doing calculations based on 302 or 351 cubic inches..not 393. As a whole this motor will move a lot more air than a stock one so it's fuel requirements will be vastly different, so I don't think this is really an option, I don't think you'll be happy with the results. The second option definitely will do what you need.. once you learn how to tune, but it's what I think you're gonna need to make this motor work the way it should.
Elder User
Joined: Jun 2010
Posts: 641
Likes: 0
From: TX
OK.. first thing you have to understand is that all Ford MAF truck EEC's(except the 460 version) are programmed for 19lb injectors so that is the only size that will work correctly and produce the expected results. You can use larger injectors but you have to do one of two things...
A) Use a matched injector/mass air meter pair that are "calibrated" to mimic the stock parts.
B) Get a tuner and change the EEC calibration data so it knows exactly what injectors are being used, the trasnfer function of the MAF meter, and the actual engine displacement.
The first option may or may not produce acceptable results because the EEC is still doing calculations based on 302 or 351 cubic inches..not 393. As a whole this motor will move a lot more air than a stock one so it's fuel requirements will be vastly different, so I don't think this is really an option, I don't think you'll be happy with the results. The second option definitely will do what you need.. once you learn how to tune, but it's what I think you're gonna need to make this motor work the way it should.
A) Use a matched injector/mass air meter pair that are "calibrated" to mimic the stock parts.
B) Get a tuner and change the EEC calibration data so it knows exactly what injectors are being used, the trasnfer function of the MAF meter, and the actual engine displacement.
The first option may or may not produce acceptable results because the EEC is still doing calculations based on 302 or 351 cubic inches..not 393. As a whole this motor will move a lot more air than a stock one so it's fuel requirements will be vastly different, so I don't think this is really an option, I don't think you'll be happy with the results. The second option definitely will do what you need.. once you learn how to tune, but it's what I think you're gonna need to make this motor work the way it should.
