I tried searching through some old threads, didn't really find much in the way of what I was looking for.

I'm trying to get a 345hp long block under the hood, and am trying to iron out the details. I'm going to go with 24# injectors..(still trying to figure out the fuel pumps and how i get that upgraded)...and am trying to figure out the MAF kit. I know the kit has everything I need, but it's 620 bucks. It also changes from the speed density multiport injection to the sequential which is what I want. Am I able to snag parts off a junkyard MAF truck..and get the sequential injection? What parts do I need? I think it might be better because..A it's cheaper..and B I dont think the MAF meter in that ford kit is big enough for 345-350hp. Any info would be greatly appriciated.

What size air meter...70-75mm?

 

You need the computer, the meter, the wiring harness. I know w/ mustangs there are a few different computers on MAF cars and some are better than others. You may want to look into that before you pick something that isn't the best computer for your needs. I would look at the kits for sale and see what they include and then get those pieces from a junkyard. I would imagine all MAF F150's are SEFI, but you may want to check on that also before you buy anything.

 

All MAF F150's are sequential injection. However, do any pre-'96 trucks have mass air and a manual transmission? If you get a mustang computer, you will have to re-wire the engine harness to make it match the computer, and add, the maf wires, the injector wiring, another O2 sensor (or split the one signal to two pins), and make sure there is a speed sensor input. The mustang computer also has provision for a WOT a/c cutout relay, and a canister purge valve. I don't know if you've seen this site or not, but it goes through what all is involved in doing the swap this way: http://brembs.net/cars/maf_conversion/ . The advantage to doing it this way is that you can use whichever mass air meter you want to. I'd say for the power you are going to be making, a 75mm should be fine. I think that pro-m makes the best meters out there, and an advantage they give is they calibrate each meter specifically for its individual application. If you go the route of a mustang computer, some of the catch codes to look for are: A9L, A3M, A3M1, and a couple others (these are for manual transmissions). Mustangs were mass air starting in '89.

 

The only trucks that are manual tranny and MAF are 96 trucks...so that is gonna be hard to find.

 

GT221,

I am currently working on doing the same thing in my '89 F150 4x4. I am transplanting a '97 5.0 w/GT40P heads and converting to mass air. I have the AOD, which is non-electronic, so it is not a factor in the wiring end of things. Here is what I have found out so far:

You cannot use a '96 F150 EEC. The '96 is EEC-V, your '95 is EEC-IV and not compatible. You may use a Mustang EEC. The most common ones used are the A9P for automatics and the A9L for manuals. You will need to change various pins around in the EEC wiring harness connector (60pin) to match the pin-outs in the Mustang EEC. You will need to separate your injector wiring in the harness and convert the bank-fire wiring to individual injector wiring, since you want sequential-fire. It may be easier to find the engine harness off a '95 auto truck and use that instead, but your existing one can be made to work if you are good with wire fabrication. Quality soldering is MUST, as well as heat shrink tubing.
You will also need to rewire the injection order to match the HO cam, since the Mustang HO 5.0 has a different injection sequence than the truck 5.0 camshaft. This is done by changing pins at the EEC connector.

Since you are running 24lb injectors, you will need a MAF meter that is calibrated for 24lb. A factory MAF meter for the '94-95 Cobra may work, since they had 24lb injectors from the factory. An aftermarket MAF meter calibrated for 24lb is another option. Either way, your MAF meter needs to be calibrated to the injector size you are using, unless you can access your EEC and reconfigure the software internally or buy a custom chip. You will also need to run wiring from the MAF meter to your EEC. There are aftermarket sources for this wiring assembly.

You will want to run a second O2 sensor. This will require you to weld in two sensor bungs in your downpipes shortly after they connect to your exhaust manifolds/headers. Additional wiring for the second sensor will need to be run from the sensor to the EEC. You may be able to get by with splicing the existing one into two signal outputs, but if you are going to all the trouble to modify your truck, do it right and run two sensors. Then you will get the most accurate fuel metering possible when the EEC is in closed-loop.

You will need to address your airbox situation. I am running a factory airbox from a MAF truck with the stock 19lb MAF meter. You can run an aftermarket cold-air intake system, since you need the 24lb MAF meter. You will need the two-into-one adapter for the factory throttle body to adapt to the single large mass air intake
intake tube. Go to the boneyard or dealer for this part assembly.

EPNCSU2006 provided some good information. I do believe your F150 wiring already has a provision for canister purge, though. It should be pin 11 on the EEC connector. Go to www.fordfuelinjection.com for a host of information on Ford MAF systems. They have parts available as well.

I am working on the A/C WOT cut-off provision, but do not have an answer for that yet.

Your truck already has speed sensor inputs on pins 3 and 6 of the EEC connector and this matches the pin-outs of the Mustang EEC.

Don't fool yourself. This can and has been done without using the FMS kit, but it can turn into a decent sized project in and of itself. You will need the pin-outs of your vehicle's EEC and the donor EEC. I chose to piece it together myself because it is cheaper and I can customize it to my needs. And I seem to always do things the hard way, lol.

Anyhow, I hope this info helps some. I plan on posting all my findings and experience on this conversion as soon as my truck is up and running, which will be within the next month (fingers crossed!).

 

Right on man. I wired in a custom mass air conversion on my '87, and I didn't have a canister purge. Don't know what they did later on for the 5.0's. I got a WOT a/c cutout wired in, but I have no idea whether or not it worked, as I didn't use the a/c in the winter. If you are able to, two O2 sensors are definitely better, but it can work fine on one that splits to both inputs on the mustang computer. If you do put two in, put them as close to the engine as possible. The stock y-pipe is 3", which is the same size as the outlet of a 75 mm bullet mass air meter. It also has a hose for crank case breather. It was $70 at the dealer, since no junkyard in my area seems to save that kind of thing. Make sure that the injector sequence matches the engine firing order. If it's the truck firing order, you'll have to swap two pairs of injectors, if it is the HO order, just wire them up like the mustang computer pinout indicates. Keep in mind that as jwtaylor posted in the other thread, there is still a possibility you will need to have the computer tuned for your individual application.

 

I converted my 91 f250 (5.8L ZF 5-speed) to sefi using an 87 speed density mustang computer. The conversion is the same as mass air with exception of mass air harness/computer. The truck pin outs are basically same as mustang eec except for injectors, thermactor, 02 sensors and a/c cutout. I would have to look at my papers again to tell you all.
The injectors always have a 12 volt source to computer as they are all tied together into one wire. The ground side of the injectors are individually ran to each of the 8 matching computer pins in the mustang computer. This is a very simple process to convert with a little time. My truck uses about half the fuel when driving easy.
As for your new combo having 350 horse I would have to know your combo. I have built many EFI Mustangs. If you want to save even more money you don't need mass air if you pick the right cam and keep vacuum high using a Mustang S/D computer.

You can even use 24lb injectors with S/D and a fuel pressure regulator. The 19lb injectors will handle over 300 horse N/A as well. You can pick up Mustang S/D computers for nothing. These are just some helpful hints. In a heavy truck you don't want a big cam and the Crower 15510 or 15511 hydraulic roller works perfect with Mustang Speed density computers. I've used this setup years ago using Edelbrock heads, ported Cobra intake, headers, 190 pump, and 24lb injectors making 325 horse in a 302! Just make sure to run two 02 sensors in some shorty headers.

 

I contacted Pro-M today and inquired. They have a MAF conversion kit but it's rediculously expensive. They want 826 dollars for the 80mm MAF sensor, the cone filter, the ducting, the harness and an O2 sensor with the bung. Then they want another 150 bucks for the computer. I think that is rediculous. I might try to get the computer somewhere else, it's just a mustang computer. The other thing is that I probably won't even use their air intake kit as I have a ram air hood and would like to keep it functional if I can. I also called Ford Racing about their conversion kit. I don't always trust the reps on the phone, but he said the kit comes with a 59mm MAF sensor (isn't that an odd number..) and all the ducting. He said it's calibrated for 19# injectors, so I'd have to have that re-calibrated, which is $100. I can't believe how complicated it is to just put 350hp under my hood, I'm starting to pull my hair out.

 

If I got ford's kit and recalibrated it for 24# injectors...would that support 350hp?

 

The junk yard conversion works fine and is usually cheaper than the kit. It's also more work. Obviously, if you have more time than money, do it yourself
It's a little soldering on the wiring harness, but not too bad. Reading the wiring diagrams also helps understanding your engine better. My conversion was a great learning experience and got the truck running way better.

 

But woudl it support 350hp is what i'm tryin to find out...

 

Mustang guys run those kinds of numbers, so I think it would handle it.

 

Well I can get the ford MAF conv. for $450...I'd have to have it calibrated for 24# injectors....which i asked about from Pro-M and it was 130 bucks.

I wonder if I could get the $450 conv. kit...and buy a pro-M meter off ebay..would that work as long as its calibrated to the 24# injectors?

 

my cheap mass air conversion:
92 MUSTANG MAIN HARNESS+INJECTOR HARNESS+OR HARNESS+
2 O2 SENSORS 150.00
STOCK MAF USED 30.00
Y PIPE FOR THE INTAKE USED 25.00
02 SENSOR BUNG W INSTALL 10.00
REMANUFACTURED A9L ECU 85.00
K&N FILTER 28.00 RU 3130 PN
MISSING SOMETHING.............
MISC WIRE, SOLDER, HEAT SHRINK ECT 25.00
TOTAL 353.00
BY THE WAY THE STOCK 19# SQUIRTERS SUPPORT 320 HP
24 ARE PLENTY OF JUICE.
YOU NEED PLENTY TIME MOST OF ALL PATIENCE!

 

That would work just fine. I would definitely go for a bigger air meter for sure. I would say that a 75mm bullet would be the easiest thing to find, and would easily support the horsepower you are estimating having.