Need Help For 5.8 Mass Air Conversion Kit
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Freshman User
Joined: May 2003
Posts: 26
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From: Wausau, WI
Need Help For 5.8 Mass Air Conversion Kit
My cousin has a 1989 F-250, and has rebuilt his 351w motor.
It now has 1.94/1.60 World Windsor Jr. Heads
Wolvine/ Crane Cam lift at valve 448/472 int./exh., 204/214 Duration
Since he doesn't know much, so he's asked for my help. I called Jet Proformance to order a custom chip; they said this truck needs to be converted to mass air. I decided to order this Ford Racing convertion kit from Summit Racing because it seemed like the right thing to do.
http://store.summitracing.com/partde...4925172+302991
I have just recieved the kit FMS M-9000-T50 today, and now I find out that this kit has the 5.0 truck firing order 1-5-4-2-6-3-7-8. But this conflicts with the 351w motor aready built with a 351 setup cam firing order of 1-3-7-2-6-5-4-8.
How can Summit advertize this kit to work for both the truck 5.0 and 5.8, when they have different firing orders? I am now puzzled with what to do now. Is there no way to make this kit work? Do I need to return it, and get a different kit?
It now has 1.94/1.60 World Windsor Jr. Heads
Wolvine/ Crane Cam lift at valve 448/472 int./exh., 204/214 Duration
Since he doesn't know much, so he's asked for my help. I called Jet Proformance to order a custom chip; they said this truck needs to be converted to mass air. I decided to order this Ford Racing convertion kit from Summit Racing because it seemed like the right thing to do.
http://store.summitracing.com/partde...4925172+302991
I have just recieved the kit FMS M-9000-T50 today, and now I find out that this kit has the 5.0 truck firing order 1-5-4-2-6-3-7-8. But this conflicts with the 351w motor aready built with a 351 setup cam firing order of 1-3-7-2-6-5-4-8.
How can Summit advertize this kit to work for both the truck 5.0 and 5.8, when they have different firing orders? I am now puzzled with what to do now. Is there no way to make this kit work? Do I need to return it, and get a different kit?
Lead Driver
Joined: Nov 2002
Posts: 9,557
Likes: 44
From: Concord, NC
That kit will work fine, but what you will have to do is swap a pair of injector wires. I'm not sure how the wiring harness is set up in the kit, so I'm not sure how easy this will be to do. What needs to happen is swap the wires for two sets of injectors - put the wire for injector 3 on injector 5, and injector 5 wire on injector 3; and likewise for injectors 4 and 7. Once you swap these, you should be good to go.
Senior User
Joined: Jul 2004
Posts: 139
Likes: 0
From: Front Range of Colorado
It can be used as is, according to Ford tech. Their reasoning goes like this: the SEFI fired all the injectors on one bank, but with MAF from a 302 on a 351W fewer injectors are not firing when they should, and the ones that are firing are correct.
That is for what it is worth.
It does work, that is how I ran my '89 Bronco 351W for a couple of years.
Pam
That is for what it is worth.
It does work, that is how I ran my '89 Bronco 351W for a couple of years.
Pam
Post Fiend
Joined: Nov 2001
Posts: 14,947
Likes: 6
From: Topsfield, MA
Pam's Red, that is called Sequential injection (vs multiport or batch fire). What the stock system does is fire one bank of injectors, than fire the other bank, and switch back and forth over and over. The problem with this is that some injectors are getting fired when the intake valve is closed. The sequential injection fires off the injectors when the intake valve is open on all cylinders, much better atomization and more power.
I have the MAF kit, and to swap the firing order you just swap the wires around.
I have the MAF kit, and to swap the firing order you just swap the wires around.
Lead Driver
Joined: Nov 2002
Posts: 9,557
Likes: 44
From: Concord, NC
I agree with Justin here - why convert to SEFI when it isn't in sequence with the engine? The stock computer fires injectors 1,4,5,8 as one bank, and 2,3,6,7 as the other bank. This is the same for both the 351 and the 302, but once you convert to the maf computer, each injector is fired individually. That makes it more important that the injector firing order matches the cylinder firing order. I've run the MAF system out of sequence, and the difference is noticeable.
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Freshman User
Joined: May 2003
Posts: 26
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From: Wausau, WI
Thanks for the replies, I am going to try installing the mass air kit with the fuel injector wires 5 & 3 and 4 & 7 switched accordingly. This makes sense to do so. This is a MPFI 351w truck engine not a SEFI, this may have added some confusion to this thread. If I am not mistaken, the 1996 302 and 351w truck engines are both SEFI, has the 1-3-7-2-6-5-4-8 firing order, and mass air factory installed, so if you make an engine swap between the two 1996 SEFI motors there would be no switching of the fuel injector wires, but a pre-1996 (in this case my cousin's truck an '89) MPFI engine swap between the 302 and 351 would require the switching of the fuel injector wires.
Lead Driver
Joined: Nov 2002
Posts: 9,557
Likes: 44
From: Concord, NC
If you are just going to run the stock computer with batch fire, there's not a need to switch anything - the injector batches are the same on both engines.
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Freshman User
Joined: May 2003
Posts: 26
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From: Wausau, WI
What I didn't realize until Pam's Red mentioned this is the new computer in the kit is a SEFI, not a MPFI like I thought. I guess I am planning to run this new computer that is supplied in the kit, but I am interested in alternative setup suggestions. I just came across another thread after I did a seach, that is about this issue, starting with post #13 of the tread
"cheap mass air for 87-91?"
https://www.ford-trucks.com/forums/s...ad.php?t=11450
"cheap mass air for 87-91?"
https://www.ford-trucks.com/forums/s...ad.php?t=11450
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Lead Driver
Joined: Nov 2002
Posts: 9,557
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From: Concord, NC
Did you also see Bjorn's website? If not, here is a link: http://brembs.net/cars/maf_conversion/ . I used this sort of as a guide for when I converted my truck to mass air.
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