Navigator engine swap
Thread Starter
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Senior User
Joined: Aug 2003
Posts: 424
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From: Eastern, Iowa
Oh wait. I don't even think this is my thread anymore.
New User
Joined: May 2008
Posts: 24
Likes: 0
From: Harrisonburg, VA
Sorry man... 
The truck started last night! We used the 4.6 computer to just see if it'd start, and it fired on the first try!
I've been around a lot of loud cars, from rods to V8 American Iron racecars, and I don't think I've ever heard a sound as wonderful as a completely uncorked 5.4 in a 2 car garage. Since the exhaust doesn't mate up, it's running with just exhaust manifolds at the moment...
Today I'm going to weld up some adapters for the exhaust and take it for a gentle test drive.
Thanks again to all of the help guys. I couldn't have done this without your advice!
Best,
Peter
The truck started last night! We used the 4.6 computer to just see if it'd start, and it fired on the first try!
I've been around a lot of loud cars, from rods to V8 American Iron racecars, and I don't think I've ever heard a sound as wonderful as a completely uncorked 5.4 in a 2 car garage. Since the exhaust doesn't mate up, it's running with just exhaust manifolds at the moment...
Today I'm going to weld up some adapters for the exhaust and take it for a gentle test drive.
Thanks again to all of the help guys. I couldn't have done this without your advice!
Best,
Peter
Thread Starter
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Senior User
Joined: Aug 2003
Posts: 424
Likes: 0
From: Eastern, Iowa
No need to be sorry. I think it's great.
CONGRATS on busting it off! I think if you get the exhaust patched up, taking it for a gentle test run should be fine. It'll run (as you've seen), it just won't run right, or at least as right as it should. Just be careful, and keep the updates coming.
COOL!
trucker, you're next!!!!
CONGRATS on busting it off! I think if you get the exhaust patched up, taking it for a gentle test run should be fine. It'll run (as you've seen), it just won't run right, or at least as right as it should. Just be careful, and keep the updates coming.
COOL!
trucker, you're next!!!!
Posting Guru
Joined: May 2006
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From: Iowa
It will still run better than a 4.6l, i put 15k on my 5.4l with a 4.6l tune before i finally got the engine tuned. I pulled trailers and abused it and never had any issues with the 4.6l tuneing. I did install the 5.4l MAF sensor if that makes any difference. But i was running the 4.6l exhaust manifolds to. I still need to have a custom dyno run made for it though.
New User
Joined: May 2008
Posts: 24
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From: Harrisonburg, VA
Hey guys,
The volumetric efficiency (VE) will be all screwed up if I keep the 4.6 computer in the 5.4. Since the 5.4 pulls more air, it will most likely run lean because the fuel tables will be calibrated for a lower displacement configuration. I don't want to run that risk. Thanks though.
The truck is getting the exhaust tied up this afternoon. I'm hoping to get the computer squared away this week. I'll report in on the result!
Peter
The volumetric efficiency (VE) will be all screwed up if I keep the 4.6 computer in the 5.4. Since the 5.4 pulls more air, it will most likely run lean because the fuel tables will be calibrated for a lower displacement configuration. I don't want to run that risk. Thanks though.
The truck is getting the exhaust tied up this afternoon. I'm hoping to get the computer squared away this week. I'll report in on the result!
Peter
Senior User
Joined: Dec 2008
Posts: 237
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From: hazleton pa
So I have to get a 5.4 comp for a 4r70 tranz around99 and get that tuned... god dam u gotta be kiddin me this is gettin pricey
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New User
Joined: May 2008
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From: Harrisonburg, VA
I put in the 5.4 computer and I'm going to have the PATS reset for around $80. Doing this allowed me to keep the PATS which you can not do with an aftermarket chip (in this example). Later I can add an aftermarket chip and keep the PATS, which I will do when I have an extra $400. I got the ECU with the engine though so it wasn't an additional cost.
Last edited by pdenbigh; Jan 13, 2009 at 01:50 PM. Reason: update
New User
Joined: May 2008
Posts: 24
Likes: 0
From: Harrisonburg, VA
As stated above, swapping in a 5.4 ECU won't work because of the PATS system. So, you have two options:
1. Get a 5.4 ECU (Car-Part.com--Used Auto Parts Market) and get the PATS reflashed by a Ford dealership, ~$80 for the flash, ~$? for the ECU.
2. Get a chip, disable PATS, and reprogram your existing ECU to work with the 5.4, ~$300.
Good luck!
Peter
1. Get a 5.4 ECU (Car-Part.com--Used Auto Parts Market) and get the PATS reflashed by a Ford dealership, ~$80 for the flash, ~$? for the ECU.
2. Get a chip, disable PATS, and reprogram your existing ECU to work with the 5.4, ~$300.
Good luck!
Peter
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From: SE Texas
JL
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From: Iowa
No, it doesn't work like that. The MAF measures the amount of air entering the engine, and the PCM uses this input to control injector pulsewidth to get the commanded air/fuel ratio. Displacement will be off,and therefore load calculation and the resulting spark calculation will be off,but it will not make you lean.
JL
JL
Thanks johnny