5.4L swap into a 04 V6 Chassis

K

krazykid

Member
#1
#1
I have a friend / potential customer that has a minty 2004 mustang V6 auto. It would be a 5.4L auto trans swap from a truck into a V6 auto chassis. He loves the car and doesnt want to part with it but wants to play with it a bit now. Hes not a huge car guy, but knows enough and likes to just hang out and mingle with car guys. I have known him since I was in diapers, so I am not going to bully him into selling the car and getting a v8 one and starting over.



I dont know enough about the Ford ECU's, but last I heard they are VIN encoded and pass the VIN for inspection. So if I pull a 5.4L from say a F150 and swap the ECU's and harness it needs to get the V6 mustang's VIN to pass along to NYS for inspections. Then what about tuning on top of that if later on he plays with boost or something else.


Can SCT or another tuner flash a 5.4L file over the V6 ECU? If not, can it allow me to change the VIN on the 5.4L ECU to the V6 cars VIN when I swap it into the chassis to pass the inspection.

The fab, body and mechanical I have covered. ECU is the only hickup I see sofar.
 
Realspeeddan

Realspeeddan

Well-Known Member
#2
#2
If you swap in the whole V8 harness and ECU from the same year mustang with a 4.6L V8 then I can tune it and should also be able to program in the VIN number.

You are asking for a lot more work for very little more power by going with a truck 5.4 instead of the 4.6L. For one thing, the truck engine is a LOT taller than the mustang 4.6L. You will probably need a monster sized cowl hood. Also, parts for the the 4.6L exhaust fitment are a dime-a-dozen. Headers and/or a midpipe to fit the 5.4L are going to have to be custom made.
 
Realspeeddan

Realspeeddan

Well-Known Member
#3
#3
To clarify, The SCT by itself will not fix the VIN number. Also, The V6 ECU probably can't be reflashed to run the V8. There are two many things different. for one thing, it only has 6 injector drivers, not 8.
 
K

krazykid

Member
#4
#4
a donor GT/4.6 was my first intention, but then thought about a 5.4 for the bad ass factor. Does the ProRacer or what ever that tuning suit fro SCT change the vin?

I can make some headers to shoe horn the 5.4 if need be. Good point on the pinouts for the V6. Thats rather obvious not that you mention it, so the V8 flash over V6 ecu is a no go. ill wipe that from the idea board. its kinda funny how you forget the simple stuff when you are thinking about all the bigger details for a swap like this.


Weight and physical size isnt a big deal... its not a track or even a purpose built car... just a fun project to mess with.

I will just sell him on finding a wrecked GT and swap that all over. I can use the K member, headers, exhaust, drive shaft, rear end and suspension, etc as long as its not tweaked from the donor and cut the list of custom/outsourced (drive shaft) stuff the 5.4 would need.



4.6 it is.


With the "tune" what are we talking? Can you turn off stuff like EGR, EVAP, downstream 02, etc? What about hardset readyness? How indepth can you get with the software. As for engine modifications, headers, exhaust, intake manifold maybe. Nothing crazy yet, so stock injectors, etc will be retained. THEN looking ahead, can I come back for a retune for say a 76mm, fueling, etc?
 
1990_LX

1990_LX

Clubhouse Moderator
#6
#6
Why not just a DOHC 4.6? Way more with for little gain and high cost with a 5.4. Plus they are so tall even with a cowl hood you'll have to cut through the hood and it looks horrendous IMO.
 
ford20

ford20

Member Plus
Staff member
NYM Staff
#8
#8
stang00vert said:
ford20
is that website legit with buying cars cuz i could use a wrecked gt?
Click to expand...
Yep ... Register there and read through it, I think after 1k you need to use a broker but you need to provide your own transportation. I have seen some good deals on there for flodded 09 GT that have sold for around 6-9k
 
S

slvrgt

Well-Known Member
#10
#10
he should just get a v-8.there is a whole bunch of stuff that needs to b changed. as for the computer question no, the v-6 computer will not work.
 
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