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4.7L V8 Swap
http://www.lostjeeps.com/forum/phpBB3/viewtopic.php?f=1&t=76166		 Page 1 of 1
Author:  JeepJunky33 [ Wed Jul 31, 2013 10:48 am ]
Post subject:  4.7L V8 Swap
So I just starting reading about people doing this 3.7 to 4.7HO swap. I would assume that this is some pretty extensive work to make it fit. I hope I'm wrong. Anyone do this and if so how difficult was it? scale 1-10 (1 being oil change, 10 being SFA swap)
Author:  tommudd [ Wed Jul 31, 2013 11:49 am ]
Post subject:  Re: 4.7L V8 Swap
Not so much making it fit, as making it possible for everything to communicate with each other inside that little computer.
and then the other little things like driveshafts/ exhaust/ etc etc
You'll notice that everyone that has been done, disappears soon after, wonder why??
Author:  audiboy86 [ Thu Aug 01, 2013 7:45 am ]
Post subject:  Re: 4.7L V8 Swap
THere has been one person to complete it so far and it went from a 3 month to a 6 month to almost a year project. It had a mechanical 5 speed also not and automatic and once completed the guy only kept it a month and only wheeled it once. Where if i remember correctly it took exstensive damage to a part of the driveline. Would I take the time to swap in a v8 on a KJ blown motor probably not. Would i find and old mechanical 4BT cummins and try or the newer 3.2BTs and try um yes please.
Author:  TheJawsOfDeath [ Thu Aug 01, 2013 8:36 am ]
Post subject:  Re: 4.7L V8 Swap
Having a manual transmission will simplify the swap. Ive done research on my own, just to prepare for a hypothetical motor swap in the future. What I found (this is regarding a 2006 KJ and a donor vehicle of a 2006 Dodge Dakota also with a manual trans) is that the difference between the ECM's is minor. There are only about a dozen different pins on the connectors that are different. This is mainly due to the Dakota ECM running an engine with 2 more cylinders, and that the 4.7 has EGR whereas the 3.7 does not. The other major difference is that the Dakota's networking is all PCI bus. The KJ has a hybrid PCI and CAN bus setup. The ecm communicates with the body control module/junction module. It's basically your gateway module to all the other modules on the bus. Since the pinout is so similar and the modules are essentially physically identical I BELIEVE that the dakota ECM will communicate with the Jeep body control module. Where it will probably get tricky is with stuff like the immobilizer and ESP. The jeep's ABS module is CAN bus the Dakota is PCI. Again, the gateway/body control module in the Jeep provides the interface between the two bus types but to me, it's an unkown. Can you reflash the immobilizer or the ECM to a different VIN sequence, so that it'll start? That's something I don't know yet. I know that in certian vehicles, the VIN can only be written once, and the ECM and Immobilizer must be replaced together (talkin about older Mitsubishis). I'm not a chrysler tech and don't have that answer yet. I'm planning on taking on the module side of the swap sooner rather than later. The ECM for the Dakota is inexpensive enough for me to pick one up to play with. The first major hurdle for me is access to a factory scan tool - at the VW shop where I work, we DO have a Star Mobile scanner (chrysler factory scan tool) but only with software/license for the Routan (caravan) minivan. There's also a DRB III around there somewhere (for the older Sprinter vans), maybe I can get somewhere with that. I'll have to make friends with someone at the Dodge/Chrysler/Jeep dealer across the street... Other than knowing what the pinout of the ECM's is and the data bus types, I haven't personally verified anything. Once I actually make some progress I'll start a thread. I do know that Honduras got his 4.7 ecm reflashed and a custom wiring harness made, he said something about it over on KJ Country forum.

As far as motor swaps go I think it's actually pretty straight foward. I've seen a modern HEMI in a Plymouth Prowler... now THAT took some custom work. I Think that if you've got a gasser KJ the 4.7 makes the most sense by far for an engine swap, more so than building up the 3.7. I'm aware of hot cams for the motor that have about the same profile as what's in the 4.7 H.O, and there's a company (forget the name) that sells ported cylinder heads for the 3.7. If you do the labor yourself, 4.7 swap would be much less expensive. You're going to have to fabricate parts, change a bunch of other things, and deal with the inevitable parts breaking from the torque of a V8, but that's just the nature of hot-rodding. If it ain't broke, add horsepower 'till it is.
Author:  audiboy86 [ Thu Aug 01, 2013 3:04 pm ]
Post subject:  Re: 4.7L V8 Swap
Again the torque numbers of the dakota 4.7L are 235 hp (175 kW) and 295 lb·ft (400 N·m) of torque for the plain 4.7L and for the magnum they are 265 hp (198 kW) and 330 lb·ft (450 N·m) of torque so in reality my CRD is making more torque and about 65 less horses. And the 3.7L is only at 210 hp (160 kW) at 5200 rpm with 235 lb·ft (319 N·m) of torque at 4000 rpm. So in reality with the base 4.7L for all the head ach you might go through is 60 lb-ft of torque worth it? I mean if you really want that gain in power take the heads off and port and polish them yourself. Then add and exhaust and intake setup and you will probably be close to the 4.7L range and it probably cost you 8 to 12 hours of your time and about 100 bucks.
Author:  TheJawsOfDeath [ Thu Aug 01, 2013 3:26 pm ]
Post subject:  Re: 4.7L V8 Swap
Totally worth it, because you'll have a F-ing awesome V8 Liberty.
Author:  audiboy86 [ Thu Aug 01, 2013 4:34 pm ]
Post subject:  Re: 4.7L V8 Swap
Yes and IFS V8 liberty if it was me I would go SFA first then do the rest but still don't understand using the 4.7L so little difference in power.
Author:  tommudd [ Thu Aug 01, 2013 4:53 pm ]
Post subject:  Re: 4.7L V8 Swap
audiboy86 wrote:
Yes and IFS V8 liberty if it was me I would go SFA first then do the rest but still don't understand using the 4.7L so little difference in power.

Totally agree one reason I haven't jumped on the 4.7 band wagon.
For what you get not worth the effort IMO. Now if you're talking 100-125 horse more plus at least that much torque, then its starting to get interesting. But then lots of the stock drivetrain would never make it since I know how I drive :wink:
Author:  TheBlueKJ [ Thu Aug 01, 2013 5:41 pm ]
Post subject:  Re: 4.7L V8 Swap
tommudd wrote:
audiboy86 wrote:
Yes and IFS V8 liberty if it was me I would go SFA first then do the rest but still don't understand using the 4.7L so little difference in power.

Totally agree one reason I haven't jumped on the 4.7 band wagon.
For what you get not worth the effort IMO. Now if you're talking 100-125 horse more plus at least that much torque, then its starting to get interesting. But then lots of the stock drivetrain would never make it since I know how I drive :wink:


Kaboom! Kaboom! Kaboom! :-)r
Author:  TheJawsOfDeath [ Thu Aug 01, 2013 5:50 pm ]
Post subject:  Re: 4.7L V8 Swap
You could easily make 100ft lb more than stock. The non-h.o. 4.7 makes 295 lb-ft, 60 more than the 3.7. Swap the intake and cams from the H.O. version of that motor and you're there. Even if you leave the motor stock, 60ft lbs is significant.
Author:  tjkj2002 [ Thu Aug 01, 2013 6:17 pm ]
Post subject:  Re: 4.7L V8 Swap
TheJawsOfDeath wrote:
You could easily make 100ft lb more than stock. The non-h.o. 4.7 makes 295 lb-ft, 60 more than the 3.7. Swap the intake and cams from the H.O. version of that motor and you're there. Even if you leave the motor stock, 60ft lbs is significant.

It's not that simple.
Author:  TheJawsOfDeath [ Fri Aug 02, 2013 12:50 pm ]
Post subject:  Re: 4.7L V8 Swap
tjkj2002 wrote:
TheJawsOfDeath wrote:
You could easily make 100ft lb more than stock. The non-h.o. 4.7 makes 295 lb-ft, 60 more than the 3.7. Swap the intake and cams from the H.O. version of that motor and you're there. Even if you leave the motor stock, 60ft lbs is significant.

It's not that simple.


The H.O. cams and intake are a direct bolt in fit for the standard 4.7, it's a popular upgrade from what I've read over on the dodge truck forums. One of their members did the cam/intake swap and posted before and after dyno results. I believe his gain was in the 30 lb-ft range. Doesn't make as much as the H.O, but close.
Author:  TheBlueKJ [ Fri Aug 02, 2013 4:20 pm ]
Post subject:  Re: 4.7L V8 Swap
TheJawsOfDeath wrote:
tjkj2002 wrote:
TheJawsOfDeath wrote:
You could easily make 100ft lb more than stock. The non-h.o. 4.7 makes 295 lb-ft, 60 more than the 3.7. Swap the intake and cams from the H.O. version of that motor and you're there. Even if you leave the motor stock, 60ft lbs is significant.

It's not that simple.


The H.O. cams and intake are a direct bolt in fit for the standard 4.7, it's a popular upgrade from what I've read over on the dodge truck forums. One of their members did the cam/intake swap and posted before and after dyno results. I believe his gain was in the 30 lb-ft range. Doesn't make as much as the H.O, but close.


At that point why not just get the HO from the get go?
Author:  JeepMorrison [ Fri Aug 02, 2013 4:46 pm ]
Post subject:  Re: 4.7L V8 Swap
TheBlueKJ wrote:
TheJawsOfDeath wrote:
tjkj2002 wrote:
[quote="TheJawsOfDeath"]You could easily make 100ft lb more than stock. The non-h.o. 4.7 makes 295 lb-ft, 60 more than the 3.7. Swap the intake and cams from the H.O. version of that motor and you're there. Even if you leave the motor stock, 60ft lbs is significant.

It's not that simple.


The H.O. cams and intake are a direct bolt in fit for the standard 4.7, it's a popular upgrade from what I've read over on the dodge truck forums. One of their members did the cam/intake swap and posted before and after dyno results. I believe his gain was in the 30 lb-ft range. Doesn't make as much as the H.O, but close.


At that point why not just get the HO from the get go?[/quote]

Seems HO around here are very hard to find. But standard 4.7 is all over. And when you do find a HO the person wants wwwaaaaayyy to much. Last one I saw was 9k!! No tranny or accessories and motor had a rod knock

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