Has anyone done the swap that ford Racing or SVT or whatever they are calling it this week offers where you put in the new computer and wiring to change the EFI to SEFI? The propaganda says it will make it idle better and have better response, and I am thinking that maybe if you are only feeding the cylinder that needs it WHEN it needs it, it might up your mileage slightly. Sounds like a win-win to me, of course it probably costs an arm and a leg.

Oh, mine is a '93 351.

 

is this a direct swap from a newer v8? is it just wiring and computer that is swapped, or injectors/sensors too? any more info would be great.

 

the cost would far outweigh any benefits, fuel or performance wise.

if your engine is not idling right or has bad response than it is not running correctly.

 

I'll have to look it up to see if it is still available from ford. I can't remember if it had injectors, but it had a wiring harness to trigger each injector individually, instead of each bank like it is wired now.

 

Quick,

Well, It's not having any problems, but things can always be better. I was interested in hearing if anyone had done it to see what their impression was. Plus I could put SEFI on my ram air scoops.

 

This kit is basically what you can get on a 94 302 up truck with MAF .But in overlay harness form .(you don't have to remove or rewire allot. ) Includes ecm and harness ETC. The kit I saw just reused stock injectors but there are hipo kits.

94 up Maf F150 can be found in most states I have seen several on east coast 95 -96 auto for sure.
I you take the ECM,wiring harness from cab forward (plug are different ) Engine harness, Air box (has sensor on it instead of intake ),MAF sensor,air tubes .Other than changing newer to cab wires to old none airbag ,ETC its not bad.
I have swapped several of these to different year trucks and the response,pick up, is allot better ,as well as Improvement in MPG. But Unless you drive 400+ miles a week I don't think it is worth what they want. If you can put together a system off existing truck I'd go that way . The 302 ecm will run the 351 and unless you have truck floored I don't think you would find difference. But If you can get all wiring ,air boxes ETC. I did last 2 swaps for $300.00 or so. I bought a whole running truck (rust bucket )with maf for $400.00 . And if doesn't run as you think it should get a ECM built to the 351 specs.
What it amounts to is if you like a challenge of finding parts and make work or buying a kit and have it done quicker . Both are good one just $$ more than other If you do it hope you enjoy it . I went from 13-14 to a solid 16 + and I drive 500+ miles a week . And am getting parts to do other. Good luck

 

Thanks, lost. You don't sound lost to me! The "scrounging" method seems to fit my lifestyle, and budget. If you have any pix I'd love to see them. Is the harness you talk about SEFI also?

I looked on ford's racing parts site and downloaded thier catalog, it had quite the expensive harness for the 302 mustang, and said it could be adapted to many other pushrod engines. I don't think it'd be too hard to build your own.

Bob

 

The MAF (is sequential injection) harness is a 94-95 ford F150 harness basically goes from firewall to Motor head lights ETC . I have separated this harness and older harness and just used what wires I need for Ecu ,Maf & motor . This will help you when getting to the in cab connections . Also the wire are removable from couplers so you can swap as needed.

To be honest if you take harness out its a no brainer to put it back in. If I can do it anyone can all the work was done I just made them work for other truck .

the 94 up ecm plugs are different then the non MAF trucks thats why need harnesses.
If you have a good electrical diagram and some time you can make changes out of truck and not take long to install. Pop the top intake lay new engine to fender well harness in (its same they just moved air temp to factory air box. ) then put ecm in and install ecm out to motor harness.
Try to get a look at a factory setup F150 ( It will tell you alllot more than the pictures will . (I'm hands on I don't take in data well) there are only like 10-12more wires 1 for each injector (6 already 2 in old) 4 for MAF and ones for air sensor in air box Good luck do some reasearch . I got a Saginaw PS pump off a e150 and it had a MAF also could use mustages. And make harness.

There was a post while back the guy did this all from scratch had pictures and how to's . It helped me on first one.

 

Actually, the ECM plug didn't change until 96. The harness is needed because of the additional wires for sequential injection and the mass air flow sensor itself. Everything else should be pretty much the same.

 

I have thew FMS kit and yes.. it delivers as advertised. Gone is the stupid cold start high idle, idle quality is better, and throttle response is great. I have other modifications on this motor, but I can still get great milage(17 HWY) if I'm nice to it, I attribute part of that to the SEFI kit. The kit was expensive, and if I had to do it again I would at least try to scrounge the parts first... Ebay wasn't really a resource for me 7+ years ago when I did this motor.

 

Now THAT'S what I'm talkin' about!

If I could approach 17mpg, I'd think I died and gone to heaven. Do you remember what your mileage was previously?

Bob

 

I don't remember, but this motor replaced a completely gutless 5.0, so it's not really relavent. I'll add that city milage falls to about 12mpg, but I don't spare the ponies.

 

I hate to tell you But the MAF PCM? ECM plug will not fit any non MAF or segential truck . I just put a setup on 93 F150 and the 93 ECM would plug into new harness and 94 PCM vise versa.

 

Dude,

I'm getting like 9 on the highway. Anything is an improvement.

Bob

 

I hear ya. But just to be clear, you won't suddenly get 17mpg by strapping this kit on a stock motor. It'll take a cam upgrade and free flowing exhaust along with the MAF conversion. All that together builds lots more low rpm torque which allows you to drive around without reving the motor very much. Spooling up the hampsters is what kills gas milage.