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Old 01-01-2015, 10:07 PM   #1
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Engine Swap

Just took over my GF's 2002 mustang. Just has the 3.8L V6 but want to swap for a bigger/better engine. Just looking for some advise and insight
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Old 01-01-2015, 10:43 PM   #2
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Generally, unless you are building a race car where you are going to replace EVERYTHING, and just want to use the body of the car, it doesn't make much sense to swap engines into vehicles that came from the factory with V8 engines already installed in some of the models. To do it correctly, there is more to swapping V8's into the six cylinder cars than just the engines.

If you want more power, I recommend selling the six cylinder car and buying a GT.
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Old 01-01-2015, 10:52 PM   #3
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There is more to it than just dropping a motor in..

Once you figure out how to swap in the motor physically and get it running you are also going to have to deal with these things.....

How is it going to bolt up to your transmission? The V6 in your year is a pushrod, putting in the V8 from the same year is a modular so you will have a rough time mounting your stock transmission to it.

Proper suspension.... Remember, a V8 is going to weigh more than the V6 (given equal factors like iron blocks ext...), so you are going to need to upgrade your springs, as well as other rear suspension just so you can actually put the power to the ground.

Will your rear axle hold the power? The stock 7.5" open differential isn't known for being effective at putting down power, or even so being durable. A stock GT with that 7.5" differential can grenade it. You will be smart to upgrade to an 8.8.


These are some of the reasons Straybullitt recommended just selling and buying a GT. Unless the car has major sentimental value to you, you will spend more modifying it to be like a stock GT, than you would just selling it and buying a GT.
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Old 01-02-2015, 05:38 AM   #4
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You could find a wrecked GT that has an in-tact drive train and swap that over, or you could find a wrecked crown vic or something.


That is going to be the cheapest way to get all of the parts that you would need.
You're going to need a new rear end, transmission, wiring harness, fuel rail, injectors, coils, sensors, a little of this, and a little of that. So I say find a wrecked one so that you have all of that stuff right next to eachother, otherwise you are going to have a giant tab at the parts store to deal with paying off.
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Old 01-02-2015, 05:40 AM   #5
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I think another good option would be to find a wrecked SUV that has a 5.4L in it. You are already doing a complete drive train swap, so why stop at 4.6 liters?? You could run the automatic that comes in the truck until you can buy a T-45 and stick that onto it.


By the way, I know you didn't come here for any nay-saying, but the most simple way to get a faster car is to just put the 3.8 back in, sell it, and buy a v8. However, swapping is better for a few other reasons such as putting a 5.4 in it and that you can probably get a doner v8 truck for under $1.5k


Who wouldn't throw $1.5k at a v6 stang in order to make it into a5.4?


It all comes down to how mechanically skilled you are really. What is your background with wrenching? you seem to have tackled the engine removal just fine so I think you have the potential
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Old 01-02-2015, 11:31 PM   #6
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Engine Swap

All of you have valid points. But the car is sentimental. It was the Car my GF and I went on our first date in. It's 13 years old and needs more than a little TLC which is why I was considering redoing the entire car. But I thank all of you for your comments it's given me quite a bit to think about


J-Dub!
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Old 01-03-2015, 10:48 PM   #7
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All of you have valid points. But the car is sentimental. It was the Car my GF and I went on our first date in. It's 13 years old and needs more than a little TLC which is why I was considering redoing the entire car. But I thank all of you for your comments it's given me quite a bit to think about


J-Dub!
Keep that car and build it man. Its not exactly the end of the world if you come up a couple hundred bucks behind where you would be from switching cars. Its not like the alternative is garunteed perfect anyways. You could go out and buy another GT and then have the engine blow in that one the next week and then have a few other issues with it.


Ask me how I know lol
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Old 01-03-2015, 10:55 PM   #8
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Sentimental value can be priceless.

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Old 01-03-2015, 11:35 PM   #9
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Sentimental value can be priceless.

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for sure. people look past all of those factors sometimes. Plus you already have the car in that situation. It takes a while to sell a car and then pick out a new one and then buy the new one and yada yada yada. Fix all the stupid crap the previous owner rigged up and then discover it has a cracked block or some ****
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Old 01-04-2015, 12:18 AM   #10
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Yes!
Life isn't always about what makes the most financial sense. I just wanted to make sure that the OP understands that there is a big commitment of time and money to undertake a project like this.
Hell, I have an old truck that I'm pretty attached to that gets a lot more money and, especially, time spent on it than most "sane" people would spend.
I've seen a lot of projects, over the years, where, people have good intentions of finishing (Or starting) them, but, for one reason or another, it never gets done. I just hate to see people fall into that trap when there is an alternative that you can enjoy RIGHT NOW!

Why don't you tell us what you have in mind for the car Parson, there are a couple of different options (modular/push rod) that you can swap reasonably easy.
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Old 01-04-2015, 12:22 AM   #11
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Sentimental value is very strong. I don't ever want to get rid of my current Mustang. So if I spend 3x what it's worth in mods so be it.


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Old 01-04-2015, 12:58 AM   #12
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Especially if you put a 5.4 in that thing. THat would make it SOO worth it. I think you might as well do that if you're upgrading drivetrain anyways
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Old 01-05-2015, 01:44 PM   #13
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Especially if you put a 5.4 in that thing. THat would make it SOO worth it. I think you might as well do that if you're upgrading drivetrain anyways
There is literally zero reason to do that vs the Coyote swap. Zero.
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Old 01-05-2015, 01:58 PM   #14
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There is literally zero reason to do that vs the Coyote swap. Zero.

It's a lot easier though. Yes the potential is much much better with the coyote. But it's also a hell of a lot harder motor to swap in


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Old 01-05-2015, 02:07 PM   #15
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There's an adapter kit out for everything now. Motor drops in, bolts to any modular trans, harness is plug and play and the tunes have all had time to get worked out for all the platforms.
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Old 01-05-2015, 02:56 PM   #16
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There is literally zero reason to do that vs the Coyote swap. Zero.
Yeah that's a good point. With the right kit to drop it in you might as well do that instead as long as coyotes are in the same price ballpark
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Old 01-05-2015, 08:01 PM   #17
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That's the thing, is depending on your budget a 5.4 swap is going to be way more economical vs a coyote swap. But if budget allows coyote all the way!! They have a ton of info and parts available now for the coyote swap if you start looking into it.

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Old 01-06-2015, 07:09 AM   #18
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That's the thing, is depending on your budget a 5.4 swap is going to be way more economical vs a coyote swap. But if budget allows coyote all the way!! They have a ton of info and parts available now for the coyote swap if you start looking into it.

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Anything getting near the performance of a basically "out of the box" Coyote on a 5.4L swap is going to be as, if not more, expensive. With that said, I do love the earlier model GT500s with the 5.4L in them but those come ready to go right out of the gate and you do pay $30k for a nice one, enen a 2007 model lol.
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Old 01-06-2015, 09:13 AM   #19
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Of course you get more performance with a coyote swap vs a standard 5.4 swap, that was not the point I was trying to make, lol.

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Old 01-07-2015, 09:27 PM   #20
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it all depends on your budget and your goals. If you told us those two things we would be able to probably all agree on 1 or 2 options
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Old 01-08-2015, 03:34 PM   #21
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Of course you get more performance with a coyote swap vs a standard 5.4 swap, that was not the point I was trying to make, lol.

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If you go straight 5.4l 2v it is almost a direct drop in. But any performance build is going to quickly eclipse the cost of a coyote.
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Old 01-08-2015, 03:57 PM   #22
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Anyone know hp ratings of the 5.4 dropped in a new edge with no mods?

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Old 01-08-2015, 04:02 PM   #23
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Anyone know hp ratings of the 5.4 dropped in a new edge with no mods?

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Depends on what it came out of. It came out of another car/truck so just look up what that car/truck had for power


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Old 01-09-2015, 10:44 AM   #24
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nobody does a 3.8 to 3.7 or even a 4.0 swap, huh? or is that a whole different monster to deal with?
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Old 01-09-2015, 04:25 PM   #25
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Anyone know hp ratings of the 5.4 dropped in a new edge with no mods?

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They pick up about 50 lbs of torque pretty much everywhere. And they really scream if you give them a tune. The ECU loves a tune when it picks up about 70 cubes, obviously. It takes more fuel and air. Its faster right up to about 4,000 RPMs on the stock 4.6 computer, but then its too much motor for the computer to know what to do with.
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Old 01-09-2015, 04:47 PM   #26
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I think another good option would be to find a wrecked SUV that has a 5.4L in it. You are already doing a complete drive train swap, so why stop at 4.6 liters?? You could run the automatic that comes in the truck until you can buy a T-45 and stick that onto it.


By the way, I know you didn't come here for any nay-saying, but the most simple way to get a faster car is to just put the 3.8 back in, sell it, and buy a v8. However, swapping is better for a few other reasons such as putting a 5.4 in it and that you can probably get a doner v8 truck for under $1.5k



Who wouldn't throw $1.5k at a v6 stang in order to make it into a5.4?


It all comes down to how mechanically skilled you are really. What is your background with wrenching? you seem to have tackled the engine removal just fine so I think you have the potential
Wow i totally agree
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Old 01-09-2015, 05:01 PM   #27
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The 5.4 2v falls flat on its face at 5k.
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Old 01-09-2015, 05:06 PM   #28
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Engine Swap

It has more torque which is because of the super long stroke. Remember that it still has the same tiny bore as the 4.6 so it's going to act like a truck. Torque down low and low revving. So if you change your gears to something longer you won't necessarily need more than 5k rpm.

The 5.4 2v heads flow like garbage also. They need porting. That's why most go with the 4v


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Old 01-09-2015, 05:06 PM   #29
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even tuned? it cant be corrected?
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Old 01-09-2015, 05:07 PM   #30
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even tuned? it cant be corrected?

The cams are what affect where the power is in the rpm range.


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Old 01-09-2015, 05:25 PM   #31
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so cant the cams be changed and tuned to compensate or am i wrong
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Old 01-09-2015, 05:27 PM   #32
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so cant the cams be changed and tuned to compensate or am i wrong

They can. But the heads flow like garbage also. Better heads plus cams and it will rev higher


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Old 01-09-2015, 05:30 PM   #33
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ugh yup got a point .
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Old 01-09-2015, 07:11 PM   #34
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The 5.4 2V has the same heads as the 4.6L. PI heads. They work because these trucks simply do not see RPM much past 4k. Put the motor in a Mustang and it'll pull real hard till about 4-4500 rpm and then act just like a 4.6L after that. Its a good swap with the TFS heads but there are no longtubes for it or an intake worth a damn. Just not a good build candidate.


With that said, I love the 5.4L in my Expy. Smooth, lots of low end, stupid easy to work on because its a modular (despite what dumbasses who take 2 days to do the COPs on them will tell you) and pretty damn rock solid with the truck 4R70 trans *knocks on wood*


Now... what I would REALLY like to get as a DD in a few years is an 03-05 Aviator, specifically the 05 with the final revision C heads. Drop a termi blower assembly on it and have it tuned and you've got a small SUV "Lightning" with a lot of amenities and they are CHEAP. Or I could just put the Lightning top end on my 2V Expy I suppose lol.

The 05/06 Lincoln LS is another diamond in the rough. 3.9L V8 making 260 to the wheels paired to the 5R55 in a very nice setup and those you can get with like 30k miles on them for $8k from a dealer.
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Old 01-09-2015, 07:30 PM   #35
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The 5.4 2V has the same heads as the 4.6L. PI heads. They work because these trucks simply do not see RPM much past 4k. Put the motor in a Mustang and it'll pull real hard till about 4-4500 rpm and then act just like a 4.6L after that. Its a good swap with the TFS heads but there are no longtubes for it or an intake worth a damn. Just not a good build candidate.


With that said, I love the 5.4L in my Expy. Smooth, lots of low end, stupid easy to work on because its a modular (despite what dumbasses who take 2 days to do the COPs on them will tell you) and pretty damn rock solid with the truck 4R70 trans *knocks on wood*


Now... what I would REALLY like to get as a DD in a few years is an 03-05 Aviator, specifically the 05 with the final revision C heads. Drop a termi blower assembly on it and have it tuned and you've got a small SUV "Lightning" with a lot of amenities and they are CHEAP. Or I could just put the Lightning top end on my 2V Expy I suppose lol.

The 05/06 Lincoln LS is another diamond in the rough. 3.9L V8 making 260 to the wheels paired to the 5R55 in a very nice setup and those you can get with like 30k miles on them for $8k from a dealer.

Or you know. Coyote swap


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