4.6 upgrades v. 5.4 upgrades (Cheaper?)
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Old March 24th, 2010, 10:37 AM   #1
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4.6 upgrades v. 5.4 upgrades (Cheaper?)


Is it cheaper to make the 4.6 faster than the 5.4 than making the 5.4 faster than itself.

If so can you explain the difference on what would need to be done as far as modification and the average price difference.

I was thinking that bolt ons for the 4.6 would be cheaper in order to make it faster than the 5.4 and it would cost more to make the 5.4 faster than itself.
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Old March 24th, 2010, 10:49 AM   #2
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Well do you own either of the engines ? If you already own a 4.6 it is gonna be cheaper because you already have the block, same with the 5.4. With either block, you can put as much into it as you want to. Their does seem to be a lot of cheap 4.6 engines online the main thing you should do is forge the engine with some good parts, don't skimp on that part, then you can pretty much do anything you want to with it as far as power adders go.
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Old March 24th, 2010, 10:52 AM   #3
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A lot of the parts between the two cars are interchangeable. The only difficult parts are the intake manifolds and the headers depending on whether you have a 2V or 4V. Everything else outside of the engine (CAI, exhaust, ect) is useable on the 4.6 and 5.4.
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Old March 24th, 2010, 10:53 AM   #4
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I have a 4.6 mustang gt and a 5.4 mustang gt, both 98. I want to do street/drag but only on one of the cars and wanted to know which would be cheaper to modify and make faster.
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Old March 24th, 2010, 11:47 AM   #5
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The same parts will get you more of a return (hp/tq) with the 5.4 instead of the 4.6.
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Old March 24th, 2010, 11:50 AM   #6
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Originally Posted by koessl View Post
The same parts will get you more of a return (hp/tq) with the 5.4 instead of the 4.6.
+1. you gotta do some catch-up if you want a 4.6 to run with a 5.4, dump that same money into the 5.4 and youre approaching real big dog territory.
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Old March 24th, 2010, 12:57 PM   #7
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Originally Posted by tfofkyle View Post
+1. you gotta do some catch-up if you want a 4.6 to run with a 5.4, dump that same money into the 5.4 and youre approaching real big dog territory.
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Old March 24th, 2010, 02:23 PM   #8
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5.4 vs 6.8 i'm not sure it's worth the swap
but 4.6 vs 5.4 it's really worth it

you don't have that much aftermarket parts for 6.8, add to this the extra weight and.. tight fitment
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Old March 24th, 2010, 02:36 PM   #9
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But having a v10 mustang would be awesome and no one will argue that.
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Old March 24th, 2010, 02:43 PM   #10
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its been done.
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Old March 25th, 2010, 11:41 AM   #11
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Okay. So I now know that it would be better for me to upgrade the 5.4 but what parts would I need to do that? It is stock at the moment.

What parts would I need to upgrade the 4.6. It has a racing trans, 4.10 gears, cai, H-pipe (no cats) and flows. I also have a diablo predator for this.

I just want to see what would be cheaper. Not really concerned about the power gain compared to each.
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Old March 25th, 2010, 01:06 PM   #12
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it's the same thing as a 4.6
except for the intake manifold and headers (FRPP shortys are working well)
you can get the adaptor plate, HPS (or HPI) intake (it's a PI intake but a little wider)
or get a 96-98 cabra intake and get it wider by about 1''
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Old March 25th, 2010, 03:10 PM   #13
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I am confused about the headers. Long tubes will not fit on the 5.4, am I correct?
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Old March 25th, 2010, 03:11 PM   #14
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Is there a performance difference between long tubes and short or just a preference?
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Old March 26th, 2010, 09:21 AM   #15
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Originally Posted by koessl View Post
BIG DOG TERRITORY!
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Old March 26th, 2010, 10:01 AM   #16
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Originally Posted by ralph30 View Post
I am confused about the headers. Long tubes will not fit on the 5.4, am I correct?
They will physically fit on the 5.4 but they wont fit on the 5.4 AND fit in your engine bay correctly.

Originally Posted by ralph30 View Post
Is there a performance difference between long tubes and short or just a preference?
I think LT's offer a little better Top end Power, but Shorties have a little better lower end.

Originally Posted by tfofkyle View Post
Hey PI Swap buddy, glad someone liked the humor!
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Old March 26th, 2010, 10:07 AM   #17
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Originally Posted by ralph30 View Post
Okay. So I now know that it would be better for me to upgrade the 5.4 but what parts would I need to do that? It is stock at the moment. I just want to see what would be cheaper. Not really concerned about the power gain compared to each.

It all depends on what youre looking for man. What are your goals? 2V or 4V (of both) There isnt a straight blanket answer for this. Like we've said, a 5.4 is going to offer better gains, but if your "cheaper" comment...

The initial install will be cheaper/easier with a 4.6 2V since you've got a GT. Hell you could do a "performance upgrade" and go with an 04 engine or something.

A 5.4 will be sweet if you do it. 330 has done it.
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