2005 4.7 xlt supercab
Junior Member
Joined: Jun 2005
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From: SC
Originally Posted by Intel486
For performance mods, I'd do tuner first. You'll notice the biggest difference in your truck with the tuner and it's really an improvement over the factory shifts too.
The next two I'd suggest would be electric fans and underdrive pulleys. They both should help a tiny bit w/ gas mileage in the city because you're reducing parasitic drag off the crank, which lets that power be used elsewhere. The E-fans also cool a lot better and my A/C seemed to work better in my old truck in start/stop traffic. A friend noticed this also with his e-fan install.
I didn't see much difference with Intake on my 4.6l other than it made a nice whistle noise.
Exhaust, when I did a magnaflow cat-back, made a good difference in my 1/4 times of around.2 of a sec from consistent 17.1s to 16.9s. I did these runs about a week apart mid-summer so the weather conditions weren't hugely different but after exhaust, I was consistently in the 16s there on after. I couldn't tell you any seat of the pants difference I felt.
And for the people talking about the 4.6l engine being underpowered, he asked about what he can do to help his truck's performance and not be told his engine isn't good for trucks. The 4.6l engine is more than capable in these trucks and not everyone is wanting to try to get sports car performance out of their trucks.
The next two I'd suggest would be electric fans and underdrive pulleys. They both should help a tiny bit w/ gas mileage in the city because you're reducing parasitic drag off the crank, which lets that power be used elsewhere. The E-fans also cool a lot better and my A/C seemed to work better in my old truck in start/stop traffic. A friend noticed this also with his e-fan install.
I didn't see much difference with Intake on my 4.6l other than it made a nice whistle noise.
Exhaust, when I did a magnaflow cat-back, made a good difference in my 1/4 times of around.2 of a sec from consistent 17.1s to 16.9s. I did these runs about a week apart mid-summer so the weather conditions weren't hugely different but after exhaust, I was consistently in the 16s there on after. I couldn't tell you any seat of the pants difference I felt.
And for the people talking about the 4.6l engine being underpowered, he asked about what he can do to help his truck's performance and not be told his engine isn't good for trucks. The 4.6l engine is more than capable in these trucks and not everyone is wanting to try to get sports car performance out of their trucks.
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Joined: Feb 2002
Posts: 283
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From: Clarence, NY
Originally Posted by Faster150
intake exhaust headers and a tuner and u will do much better but the new F150's are so heavy the 4.6 doesnt push em to well even the 5.4 has trouble pushin all that weight
Can't wait to see this answer.....
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Joined: Jun 2003
Posts: 29
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From: The South
Originally Posted by Faster150
higher the octane the slower the burn the more power generated and the cleaner and more efficient the burn. so yes with high octane tune u will have better fuel economy and more power.
The octane rating has NOTHING to do with burn speed.The chemical makeup of the fuel is what determines the burn speed.The octane rating is for knocking (detonation), its (octane) is also known as the ATI (Anti Knock Index).So no the octane rating will not give you a horsepower increase,or decrease,but it will stop pinging,knocking/detonation.
Last edited by orange peel; Aug 19, 2005 at 07:05 PM.
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Joined: Oct 2001
Posts: 2,130
Likes: 1
From: Nawlins
Originally Posted by orange peel
LOL- Thats a bigger myth than Santa Clause.
The octane rating has NOTHING to do with burn speed.The chemical makeup of the fuel is what determines the burn speed.The octane rating is for knocking (detonation), its (octane) is also known as the ATI (Anti Knock Index).So no the octane rating will not give you a horsepower increase,or decrease,but it will stop pinging,knocking/detonation.
The octane rating has NOTHING to do with burn speed.The chemical makeup of the fuel is what determines the burn speed.The octane rating is for knocking (detonation), its (octane) is also known as the ATI (Anti Knock Index).So no the octane rating will not give you a horsepower increase,or decrease,but it will stop pinging,knocking/detonation.
I can't say much towards Faster150 on fuel consumption though because on my old truck I went b/t 93 and 87 burns for my truck and saw no difference in mileage. If it was there, then it was super small and using 93 so you'll get better mileage to save money just wouldn't work.
Senior Member
Joined: Oct 2001
Posts: 2,130
Likes: 1
From: Nawlins
Originally Posted by Fancman
Where do you get the electric fan conversion for the 5.7 engine in a 05 F150
I also prefer the direct mount fan kits over the ones that come in a shroud beacuse the shourd mounted fans have to have BOTH fans on to get maximum airflow. If only one is on, then you lose some pressure through the other hole.
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Joined: Jun 2003
Posts: 29
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From: The South
Originally Posted by Intel486
Octane does slow down the burn rate and real IsoOctane does contain less energy. But, the anti-knocking does allow the spark to go off earlier creating a more complete burn in the cylinder and a longer cylinder stroke that actually has burning fuel pushing it.
I can't say much towards Faster150 on fuel consumption though because on my old truck I went b/t 93 and 87 burns for my truck and saw no difference in mileage. If it was there, then it was super small and using 93 so you'll get better mileage to save money just wouldn't work.
I can't say much towards Faster150 on fuel consumption though because on my old truck I went b/t 93 and 87 burns for my truck and saw no difference in mileage. If it was there, then it was super small and using 93 so you'll get better mileage to save money just wouldn't work.
The energy content of the fuel is what determines the flame burn,of course IsoOctane is a part of that of the content.Basically what Im saying is the Octane number alone doesn't produce more horsepower,but its the energy content of the fuel,timing,compression,and combustion chamber that also plays a much bigger role.You can have 3 jugs of 87 Octane,but one of them can have a different chemistry.
I admit it gets complex,and a lot of variables start to play in.
EDIT I just re-read my post(s) and I was coming off sounding like a smart@*#(sorry about that).You guys know how oil/gas is, its like a religion sorta.LOL
Last edited by orange peel; Aug 19, 2005 at 09:04 PM.
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Joined: Jan 2005
Posts: 5,389
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From: Fort Worth,Tx
Originally Posted by Intel486
Octane does slow down the burn rate and real IsoOctane does contain less energy. But, the anti-knocking does allow the spark to go off earlier creating a more complete burn in the cylinder and a longer cylinder stroke that actually has burning fuel pushing it.
I can't say much towards Faster150 on fuel consumption though because on my old truck I went b/t 93 and 87 burns for my truck and saw no difference in mileage. If it was there, then it was super small and using 93 so you'll get better mileage to save money just wouldn't work.
I can't say much towards Faster150 on fuel consumption though because on my old truck I went b/t 93 and 87 burns for my truck and saw no difference in mileage. If it was there, then it was super small and using 93 so you'll get better mileage to save money just wouldn't work.
in theory fuel milage should be better cause ur engine can use less fuel to make same amount of power but thats only if it was runnin rich on 87 and fuel curve is corrected with 93... but most people tune for more power so same fuel is used only its more efficient burn so less waist... but usually turns out about the same but i saw about a 3mpg increase when i got a 93 octane tune compared to regular 87 octane...
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Joined: Jan 2005
Posts: 5,389
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From: Fort Worth,Tx
Originally Posted by 01vert
This post is full of soooo much pooo im going to bank my two cents!!!!!! 
yeh he kinda killed it with the 4.7L then when someone said the 05 has a LS1 motor in it lol