4.6l needs more power
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Joined: Jan 2009
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4.6l needs more power
Greetings,
I've got an 02 F150 SC, 4.6l, 2wd, 3" Pro Comp lift and 31" Pro Comp ATs. It's my daily driver and not used as a work truck. I'm looking to get some more power out of the motor for the occasional mountain and river runs. I don't tow anything right now, but a 20'-25' ski boat might be in the picture shortly.
I'm thinking of adding a K&N Generation II FIPK and a Gibson Super Truck 9516 cat back to start with. Eventually I'd like to add a Gibson header, as well.
I'm not really concerned with gas mileage, just looking for a more responsive throttle and more power climbing hills.
Does anyone have a similar set up and are you happy with your results?
Anyone have any input on other bolt on options that would get me some more power? I'm not looking to do an engine tear down or add a turbo/supercharger at this point. Just trying to get some more power with available bolt on options for now.
Thanks
I've got an 02 F150 SC, 4.6l, 2wd, 3" Pro Comp lift and 31" Pro Comp ATs. It's my daily driver and not used as a work truck. I'm looking to get some more power out of the motor for the occasional mountain and river runs. I don't tow anything right now, but a 20'-25' ski boat might be in the picture shortly.
I'm thinking of adding a K&N Generation II FIPK and a Gibson Super Truck 9516 cat back to start with. Eventually I'd like to add a Gibson header, as well.
I'm not really concerned with gas mileage, just looking for a more responsive throttle and more power climbing hills.
Does anyone have a similar set up and are you happy with your results?
Anyone have any input on other bolt on options that would get me some more power? I'm not looking to do an engine tear down or add a turbo/supercharger at this point. Just trying to get some more power with available bolt on options for now.
Thanks
Posting Guru
Joined: Oct 2005
Posts: 2,209
Likes: 1
From: Louisville, Kentucky
Forget everything that you mentioned, other than sounding louder it won't do anything for power gains. Re-gearing the differentials will give you the best bang for the bucks and will be the best way to gain power. You can always do the other things later if you want. Good luck! 
Posting Guru
Joined: Oct 2005
Posts: 2,209
Likes: 1
From: Louisville, Kentucky
There is going to be a axle code on the door post label. Mine is H9 which makes it a 3.55 Limitied slip differential. If it has two numbers like 19 that would mean a 3.55 open differential. With a 4x4, both axles will be geared the same. When re-gearing a 4x4, both differentials have to be changed. Going to a 4.11 gear ratio should liven it up good especially with the shorter tires that you have. If you had bigger tires, you might consider 4.56 gears.
Posting Guru
Joined: Oct 2005
Posts: 2,209
Likes: 1
From: Louisville, Kentucky
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Posting Guru
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From: Louisville, Kentucky
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Elder User
Joined: Dec 2005
Posts: 703
Likes: 1
From: Middle of a field CT
If you are only looking for a power gain occasionally you may want to look into nitrous.
It is relatively cheap to install and won't hurt your fuel mileage like gears can.
Just another option
It is relatively cheap to install and won't hurt your fuel mileage like gears can.
Just another option
Elder User
Joined: Dec 2005
Posts: 703
Likes: 1
From: Middle of a field CT
If it is installed properly there is no damage, you need to dyno tune after install to get the correct fuel and nitrous jet sizes for a given pressure. As long as you watch the fuel/air rato and don't let it get to lean it can live a long happy life. If you can't get an accurate fuel/air ratio reading you are better off running a little rich.
Senior User
Joined: Apr 2008
Posts: 125
Likes: 0
From: London, Ontario
If your going to use it for some offroading activity you might want to swap out your open end axle for for a limited slip one. I'm actually going to be doing that in about a half hours time (got the truck all jacked up and swapping out a 3.08 open end (
) for a 3.55 LSD). Its not too complicated, but it can be a pain if your hardware is rusted (U-bolts and such). Its also not very expensive if you do it yourself either, I got mine for 500 bucks here in Canada and I'm sure you could find something cheaper in the US. Other than that the only cost is a little brake fluid and differential fluid and friction modifier. 
) for a 3.55 LSD). Its not too complicated, but it can be a pain if your hardware is rusted (U-bolts and such). Its also not very expensive if you do it yourself either, I got mine for 500 bucks here in Canada and I'm sure you could find something cheaper in the US. Other than that the only cost is a little brake fluid and differential fluid and friction modifier.