Josh,

I purchased Mustang replacement HEGOs, and connected them to the '89 Mustang harness with the connectors that come with them.

I read about the air in the HEGO in the Ford Fuel Injection book, so I checked the voltage with a meter and it shows that the HEGOs are working properly.

The HEGO compares the amount of oxygen in the exhaust to the amount in the outside air. If the outside air is blocked, the HEGO shows lean. If the Zirconium element in the HEGO gets contaminated, the HEGO shows rich.

 

Dan you could be making head way. It is really too bad that you do not have a spare ECM to try out and see how things record in calcon.

I am still going to look for those LMAF transfer numbers and email them to you.

 

The way that I chose to do this is elegant, expensive, and overkill for most motors, but I have learned a lot in the meanwhile. I have a simpler approach. I am trying to enlist Tim Meyer's help to develop.

 

I was actually thinking more along the lines of a Chevy TBI air/fuel setup with Megasquirt... or maybe just playing around with configurations until my wallet hurts too much. Definitely not going for ultimate power, more of a power/driveability best-fit.

 

Throttle Body Injection is not much better than a carburator. Megasquirt is OK, and the price is right, but it like most aftermarket systems are bank fired speed density systems. All modern factory EFI systems are Sequential Mass Air systems. The Ford 5.0 EFI system is the best starting point for a Sequential Mass Air EFI system. You don't have to go with used parts to build a 5.0 based EFI. There are wiring harnesses available from several vendors. Rebuilt ECUs are available from your local Auto Supply. I believe that the FAST EFI system is based on the 5.0. There are other vendors like AEM, who have products for Ford 5.0 EFI. There is a vendor named Mass-Flo, who has a 4 barrel throttle body that mounts to a Holley 4150 carb base. A Mass Air meter is then mounted on top of this unit. A carb type air cleaner can be installed over this. The whole thing looks like a carb, but it is a throttle body/mass air assembly.
On a 351M/400 motor the real problem is the intake manifold. In theory any 4 barrel manifold will work, but a single plane manifold is usually required, because a fuel rail requires that all the injectors be at the same height. The runners in a dual plane intake are at different elevations and don't lend themselves to fuel rails. Single plane intakes for 351M/400 motors are hard to find. There is another way that eliminates the fuel rail. It uses a distibution block with discrete hoses and 'hats' for the injectors which are mounted at different heights on a dual plane manifold. The bungs can be welded or epoxied or even screwed into the manifold.
I have an idea that will allow the use of fuel rails with a dual plane or single plane manifold, and no machining of the manifold will be necessary. I have approached Tim Meyer about this and he is interested, but he has his hands full already.

 

Throttle body injection versus sequential... true most vehicle 90's up are sequential but I always thought they got worse mpg than their 80's equivelent. My 84 tbird with 3.8L CFI get better milleage than my wifes 98 mustang with a 3.8L and my dads 88 chevy 4.3L gets better milleage than his new 4.3L does (both are the same model truck). And my '99 v6 truck gets down right ugly millage for a 6 lol! Granted these are all mostly highway so these mpg figures are mostly 'part throttle'.

I am very interested though in both of your projects, Hopefully when all the bugs are worked out maybe you guys can make an article on the whole process. I am determined to put efi on my 78 bronco 351m/400. I was going to use the holley commander 700 kit for ease of installation and for its computer interfacing capabilities and software, but if a sequential system is better and can be had for less then I am all ears.



There was a fella here when I first joined, I think it was '79scaefer' or something like that, and he said he had built his 78 f-250 and his wifes 78 bronco with efi each. He used holley 'projection' kit, edelebrock intake & cam and claimed both the bronco and truck got 15mpg solid. The truck had 38's and the bronco had 35's if memory served. That is waht really got my attention as my bronco only gets about 9mpg with a carb and takes forever to warm up. Heck 15 is better than my new truck - it gets 14-15 typically. If I can get 15 out of my bronco with good horsepower I would drive that thing everywere!

 

I have heard BAD things about the Holley Commander, the Accel DFI Gen VI(?) is much better. These are both speed density, and they are built for use at WOT. There is not a lot of difference between sequential and speed density at WOT, since they are both near 100%.

I ordered a new connector and pins, so I will not be doing any more tuning until I get my harness fixed.

 

you can go ultra cheap and go without a tuner like Dan and I are. But Me as Dan both want something we can toy around with.

mass air EFI from 89 -- 93 mustangs, get bigger injectors and a mass air meter matched to the injectors, larger throttle body and make everything else yourself. I bet you could be in under 1500 if you took your time.

 

Yeah about 1500 is gonna be my limit. I hadnt heard anything bad about the holley kit in my research but maybe I'll look at other options. I only looked at it because of the great milleage Scaeffer got using the kit on these motors, although his build might have been more mild with the edelbrock cam. My main goals for my motor will be reliability for possible daily driver use with good milleage, and hopefully around 300 hp and 400# ft torque. I wont probably be doing it for another year, so I was hoping you guys would finish your projects and I would have a better idea of what I wanted to do. I think your builds are a bit more wild than what I am leaning towards though...

 

Here is a link to a great product for sequential EFI conversion. I might have used this, but my project was too far along when I found out about it.

http://www.mass-floefi.com/

 

Those mass-flo systems look pretty good...but there a little to pricey for me. Actually a lot to pricey - I'd probably have a divorce on my hands if I spent over 3k on my bronco in one time lol. Unless I can find something in the same price range as the holley kit I might just have to try it. Jegs has the holley kit here localy for $1,349.99 and if I am not mistaken it is everything you would need minus an electronic distributor which can be had from 80's fi'd 460's. Well ,like I said it might be a while so hopefully some more options will present themselves. Keep up the good work guys.

 

Mass-Flo wants $1695.00 for a system if you supply the computer and harness. This price includes a conversion manifold. The price of the TB and MAF alone is less, and there is a way to eliminate the conversion manifold. I think that the converision can be done with the Mass-Flo parts for $1000.00 less than the listed price using parts obtained from other sources.

 

Trick Flow has plans for an EFI 351C lower intake manifold but it's gonna be on the back burner for a while.

 

howell would be a far better choice if your lookig for tbi, $1200 with custom chip burnt for your engine. I would avoid holley stuff like the plege unless your going to get the top of the line commander setups.

 

Her is a link for a Power Elbow. This will allow a Ford 70 or 80mm TB to be mounted on a 4 barrel carb intake.

http://www.coasthigh.com/Fuel%20Inje...ower_elbow.htm

This might cut the cost of a moderate performance EFI conversion down to something in your pricerange.