I've heard many people talking about changing their carb trucks to efi and i was wondering if it is possible to change from efi to carb and would it be a simple application or would it be a difficult project.

 

If you want to, it is easier than going to EFI, but why would you want to? Effect on emissions? well.... Herman

 

This is my opinion but I will share anyway. To change to carb I believe you would need an adjustable fuel pressure regulator and that is about it. If I were gonna go for the most power from my six I would go this route. Reason being if you go carb you have many more options and would receive a greater benefit from each mod. Efi you can only get a cam and maybe a couple of internals along with a chip to make some power but the benefits or gains are minimal. Going with carb you can drop an intake a rough cam and tune it up mill the heads and you will have a lot more although you may lose some ease of starting and the ability to hold a tune. Then again that is part of the trade off. Either way it can be done just a little easier at this point in time as far as aftermarket and part availability. Just a thought

 

[font size="1" color="#FF0000"]LAST EDITED ON 03-Nov-01 AT 05:16 AM (EST)[/font][p][hr]
Efi you can only get a cam and maybe a couple of internals along with a chip to make some power but the benefits or gains are minimal. Going with carb you can drop an intake a rough cam and tune it up mill the heads and you will have a lot more although you may lose some ease of starting and the ability to hold a tune.
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OK, I just cant ignore this one. First off, you can do anything internally to an EFI engine that you can to a carb equipped one. Bore it, stroke it, tweek the head......whatever your heart desires, it won't effect the EFI. The only real limiting factor you'd have to consider is being able to supply enough air/fuel to feed it, and that has long since been solved with a simple injector swap.

As for cam's, the only thing you have to be careful of is if you have an OBD-II computer, which was only on '96 trucks (the rest are OBD-I). Just make sure any cam you choose has atleast a 112* lobe separation, and I'd stick to no more than a 214* @ .050 lift. That puts you in the 270-280 range for advertised duration.....which is a huge increase over stock and still pleasent to drive.

As for tuning, thats where the chip comes in. With the larger injectors, free-flowing intake and exhaust, bigger cam, and whatever other mods you perform, a custom programmed chip will be able to tune them in closer to perfection than you can get with any carburator and it will stay in tune.

Sorry if this sounds like I ripping on what jwtaylor said, but I just want you to be informed with all the facts before making a decision. Personally, I wouldn't trade my EFI for a carb just because of ease of starting and reliability, but that's my 2 cents on the matter.

Jim
https://www.ford-trucks.com/dcforum/User_files/3aaa4bac6f539876.jpg
1993 F150 2WD
6" Pro-Comp Stage II Lift w/35's
Auburn Pro-Series Diff. w/4.30 gears
http://www.ProjectTrailDawg.com

 

I get what you are saying and take no offense, but you would have to admit that for the money on a carbed motor that by changing the intake cam and carb and headers you would see more gains than if you change the cam headers and chip along with injectors on an efi. About the same money yet the gains would be somewhat greater because of the intake flow. Now the tuning would be nicer with the efi. And on top of that getting a chip that would perform optimally would be pretty hard to find unless access to a tuning dyno were available. Without that you could be limited greatly unless the chip supplier nailed it on the head. And the efi intake will only take you so far, true? Either way is fine just depends on knowledge and money.

 

You're forgetting how much of a pain it would be to pull all the sensors, wiring, computer, bla bla bla to convert over to a carb. I see your points, but dollar for dollar sticking with the EFI would be more beneficial if its going to be a daily driver. Now if it was going to be strictly an off-road behemouth......well....:P

Jim
https://www.ford-trucks.com/dcforum/User_files/3aaa4bac6f539876.jpg
1993 F150 2WD
6" Pro-Comp Stage II Lift w/35's
Auburn Pro-Series Diff. w/4.30 gears
http://www.ProjectTrailDawg.com

 

I agree

 

Yes, going carbed is cool and low-tech, but there's as much of an art to tuning a carb as there is to tuning EFI. Besides, EFI makes it a lot easier to go through emmissions, and here in Arizona emmissions are a pain. Besides, like TrailDawg was saying, an engine is an engine, and you can do anything to an EFI vehicle that you can do to a carbed vehicle in terms of mods. And then, some vehicles would need a new tranny if you went from EFI to carbed, because the tranny is dependant on the computer.
Done blabbing.