MAF conversion, computer swap question.
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Tuned
Joined: May 2005
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From: MI
MAF conversion, computer swap question.
I have a '95 F150, 5.0, manual. It has speed density. I looked around and I have more than enough parts to do a MAF conversion. I've got a good meter, engine harness, and all the other little parts you need. My question is on the computer.
Can I use an A9P computer with a M5OD 5-speed manual trans? I figure I need to swap around a few wires in the connector, so if anyone has info on this, it would be appreciated.
Can I use an A9P computer with a M5OD 5-speed manual trans? I figure I need to swap around a few wires in the connector, so if anyone has info on this, it would be appreciated.
Thread Starter
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Tuned
Joined: May 2005
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From: MI
Will I need to swap any pins around on the connector?
I wanted to change it because I feel this engine, which came out of my '94, ran much stronger when it had MAF. The engine is a crate rebuilt. Has an aftermarket roller cam, which I believe is something similar to a mild RV cam. Bored .30 over with flat tops, it hits 195psi on a compression test when hot. Plus, I like to play around a lot and I've heard the Mustang computers have a slightly more aggressive fuel and spark curve. And, I may be able to bump my mileage up a hair.
Later, I'm changing the intake and I have some full-length headers to install. I'll also do some porting to the heads and lower intake. Now I've heard SD is a little sensitive to changes.
I wanted to change it because I feel this engine, which came out of my '94, ran much stronger when it had MAF. The engine is a crate rebuilt. Has an aftermarket roller cam, which I believe is something similar to a mild RV cam. Bored .30 over with flat tops, it hits 195psi on a compression test when hot. Plus, I like to play around a lot and I've heard the Mustang computers have a slightly more aggressive fuel and spark curve. And, I may be able to bump my mileage up a hair.
Later, I'm changing the intake and I have some full-length headers to install. I'll also do some porting to the heads and lower intake. Now I've heard SD is a little sensitive to changes.
Elder User
Joined: Oct 2006
Posts: 843
Likes: 1
From: Redmond, WA
Originally Posted by RC Dan
Will I need to swap any pins around on the connector?
I wanted to change it because I feel this engine, which came out of my '94, ran much stronger when it had MAF. The engine is a crate rebuilt. Has an aftermarket roller cam, which I believe is something similar to a mild RV cam. Bored .30 over with flat tops, it hits 195psi on a compression test when hot. Plus, I like to play around a lot and I've heard the Mustang computers have a slightly more aggressive fuel and spark curve. And, I may be able to bump my mileage up a hair.
Later, I'm changing the intake and I have some full-length headers to install. I'll also do some porting to the heads and lower intake. Now I've heard SD is a little sensitive to changes.
I wanted to change it because I feel this engine, which came out of my '94, ran much stronger when it had MAF. The engine is a crate rebuilt. Has an aftermarket roller cam, which I believe is something similar to a mild RV cam. Bored .30 over with flat tops, it hits 195psi on a compression test when hot. Plus, I like to play around a lot and I've heard the Mustang computers have a slightly more aggressive fuel and spark curve. And, I may be able to bump my mileage up a hair.
Later, I'm changing the intake and I have some full-length headers to install. I'll also do some porting to the heads and lower intake. Now I've heard SD is a little sensitive to changes.
The MAF ecu from the mustang will work fine with your M5OD. Now if it was an E4OD, you would be looking at some serious incompatibility. I assume your crate motor has the 1-3-7 firing order? If not, you might have to swap some injector wires...
Good Luck!
Mike
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Joined: Aug 2007
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From: CANADA
SD is very sensitive to change. SD I believe is also batch fire(bank to bank) and the mass air is sequential. Not sure on interchange of computers, A9Ps are supposed to be for autos, A9L is for standard trans. This might help http://brembs.net/cars/maf_conversion ( Hope I got that right )
Postmaster
Joined: Jul 2006
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From: Central PA
If you get the 302 maf ecu you canget a tweecer to trick it to think the auto is there. Since you have the harneses ETc . Most maf truck moved the air sensor to air filter box so you will need it or to run extra wire to the intake one. Good luck have fun it really dose liven up things.
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Tuned
Joined: May 2005
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From: MI
Mr. M, yes, it has the 1-3-7 firing order. Whenever I reset a computer, I always let it idle for a few minutes. Then I take it out, cruise around lightly till its warmed up all the way, and lay into it hard a few times. I've always got the smoothest running and idling engine this way.
The batch fire to sequential is where I may pick up a couple more MPG. Great link, btw. That site has links to even more info, too. 
I'm thinking all I'll get is a few trouble codes when it looks for feedback from the tranny.
Originally Posted by BEWOLD
SD is very sensitive to change. SD I believe is also batch fire(bank to bank) and the mass air is sequential. Not sure on interchange of computers, A9Ps are supposed to be for autos, A9L is for standard trans. This might help http://brembs.net/cars/maf_conversion ( Hope I got that right )
I'm thinking all I'll get is a few trouble codes when it looks for feedback from the tranny.
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Lead Driver
Joined: Nov 2002
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From: Concord, NC
The A9P doesn't look for the transmission, so there won't be any transmission related trouble codes.
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From: Central PA
Originally Posted by lostin90s
If you get the 302 maf ecu you canget a tweecer to trick it to think the auto is there. Since you have the harneses ETc . Most maf truck moved the air sensor to air filter box so you will need it or to run extra wire to the intake one. Good luck have fun it really dose liven up things.
Postmaster
Joined: Jul 2006
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From: Central PA
I put the whole maf set up for 95 F150 in mine . I went from 13MPG to 15-16 MPG and the response is alot better. After I do the fordracing wires and msd coil and cap . It should really liven up. But good luck
Elder User
Joined: Oct 2006
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From: Redmond, WA
Originally Posted by lostin90s
. After I do the fordracing wires and msd coil and cap . It should really liven up. But good luck
Mike
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Tuned
Joined: May 2005
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From: MI
More Questions
Ok, I do not have the rest of the truck harness from the firewall to the main connector under the hood. I know the MAF wires and plug came from this harness, so I looked up and found that the "RTN Signal" goes to pin 9, and the other goes to pin 50. Then there is the power and ground. Is that correct? Cause I also heard about pin 36, 40 or 80, and 88. Also, are the extra wires needed for the injectors there from the main ECU connector to the under-hood connector? Or, should I just go to the junkyard and grab this section of the harness?
Thats alot of stuff that most MAF conversion write-ups don't cover. I must have went through like 15 of them and found this looking through wiring diagrams I already have. How come no one here has gotten around to putting a write-up on this site?
Thats alot of stuff that most MAF conversion write-ups don't cover. I must have went through like 15 of them and found this looking through wiring diagrams I already have. How come no one here has gotten around to putting a write-up on this site?