Thread: ford EFI questions

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I am currently redoing Shirley's Mustang. Adding 08 Mustang front and rear bumpers and side skirts, + other body mods, new interior, changing exhaust from sidepipes to regular. I am also considering changing from carb to EFI. Having never messed with it before I need some advise. I have seen some mid 80's EFI complete systems go for less than $100 on Ebay and it seems an inexpensive way to get into the new technology.
My question is what would I have to have in order to make it work on her current engine?

67 289 .030 over, KB hyper pistons, Hipo rods, ported heads w/big valves ,10.5 compression. I don't have the cam card in front of me but I recall it is close to .500 lift hydraulic, around 230 dur @.050 110 overlap ? I read that the stock gen IV EEC will probably not work with those mods but I could have a new chip burned for it? What about throttle body and injector sizes?
It is currently running a modified holley 3310 on a airgap single plane, MSD magnetic dist + 6AL box, C4 trans with kit, and 4.10's in a 9".
Is it worth the effort to change it all out other than for aesthetic reasons?
Thanks for the info .
John

Isn't the World Wide Web a marvelous invention. I did some more research and found that logically (if one would but stop to think before one begins to type) the reason that mid 80's efi's are cheap is because no one wants them. The reason no one wants them is because they are mostly obsolete. The reason they are osbsolete is because they won't function well unless they are on the original engine they came with.
So, to answer my own question- If I still want to entertain the idea of retrofittiing a modified older engine with newer EFI, I will need to spend the appropriate amount of money to make it work right.

I Know, I know, that is what you were thinking all along.

Well, some times one must ask the foolish questions to force oneself to find the correct answers.

John

I am sure you can do all you need to with the stock system,just make shure its a mass air system.
Unless you are tryin to go 10 seconds in the 1/4,it will work fine.
Those roller cam blocks are resposive little things.

A good EFI conversion to do is www.mass-floefi.com and it's a complete system minus the fuel lines (which you can buy from them). That's my plan next time I convert anything to EFI. What I did a while ago was use the EFI setup out of a 1993 Mustang on my 67 Fastback. Massflo uses that same computer for their EFI, incidentally. As you've found out, there are two types of EFI: speed density and mass air. Mass air is easier to operate and can handle cam changes, etc. That's the main reason everyone likes using it and the speed denisty is obsolete. If you plan the Mustang route and want to use donor parts, stay away from 86-88 Mustangs. They were all speed density (I think it ended in 88??...anyway...). And for the record, 1990-1993 are the best computers. You could pick up a used 1990 LX 5.0 and have all the EFI stuff for a few grand, then part the car out and make some money back. You could even do the 5 speed swap or newer overdrive trans swap too!! But as a rule, EFI and inexpensive really don't go hand in hand for the most part. Hope that helps.

Our setup isn't inexpensive, but it works and looks great! Al
www.thormotorsports1.com

Thanks for the info guys. I purchased a Mustang EFI conversion guide that lists all of the pertinent equipment and procedures and I have a line on a complete 90 mustang system for $300. I will let you know how it turns out.
John

Good deal John. It's one of the more easier EFI conversions to do. Good luck!

Cheers

Thanks for the encouragemnt Dave.

I am one of the those guys who has to be dragged kicking and screaming into the EFI age.

I hope you are right.
John

Originally Posted by 41willys

Thanks for the encouragemnt Dave.

I am one of the those guys who has to be dragged kicking and screamining into the EFI age.

I hope you are right.
John

Keep us posted as you do the conversion. My car is carbed now, but really would prefer an EFI. I only went this carbed way to keep my complicating factors to a minimum while I built the car.