F-250 Performance upgrades????
Thread Starter
|
New User
Joined: Nov 2008
Posts: 4
Likes: 0
F-250 Performance upgrades????
Hey guys I need some help on some mods for my F-250 Super Duty. Iam trying to post this in a few differnent spots to get as much feed back as I can. I have a 2008 F-250 FX4 with the 5.4. It has the automatic torque shift trans. and 4.10 rear end. I am thinking of doing a cat back exhaust system (supper 44), K&N Gen. II cold air intake, and hypertech computer programer. My questions were 1) Are these mods worth it? 2) Does the flowmaster sound good on the 5.4's? 3) I am going single in dual out, does it make a difference in performance wheater I dump them both out behind or in front of the Passenger side rear wheel. 4) What kind of horsepower/torque gains should I see? 4) Will any of this void factory warranty? Any and all input would be great....thanks guys.
Junior User
Joined: Feb 2007
Posts: 87
Likes: 0
I don't know what the actual setup is on 2008s is as far as intake and exhaust goes, but my 2003 F-350 with the 2v 5.4 had noticeable gains with a tuner running high octane gas, and this was coupled with a high flow single exit exhaust and a K&N replacement filter (not the cold air kit, which in my opinion shouldn't be called "cold air", because of the inlet location, but that's me...). After the gas prices rose I set it back to regular, because the gains aren't worth paying that much extra money. So if you want something that will blow your socks off you should try getting a supercharger, nitrous or maybe contemplate trading your truck in for a v10 or the diesel.
New User
Joined: Nov 2008
Posts: 24
Likes: 0
use a sct x-cal 3 with custom tunes from mike troyer ,www.troyerperformance.com air force one intake,magnaflow siso catback.
Former ******
Joined: Nov 2004
Posts: 4,901
Likes: 2
From: Salt Lake City, Utah
The best gains can be realized by addressing the most restrictive parts of the system, namely, the y-pipe and the factory muffler. I don't think it matters much from a performance perspective where you bring that tailpipe out.
A catback should not adversely affect your warranty. I wouldn't expect to see a huge gain, but it would be noticeable especially in combination with your other mods.
A catback should not adversely affect your warranty. I wouldn't expect to see a huge gain, but it would be noticeable especially in combination with your other mods.
Hotshot
Joined: Mar 2007
Posts: 10,101
Likes: 40
From: Pa
Overall the intake and exhaust setup on the 08' SDs is not that bad. A free flowing muffler and a nice tip is about all I'd do to the exhaust end. A catback is fine if you want to spend the $$$. The y-pipe area is fine on these trucks. The intake has a bunch of sound deadening chambers that no doubt hurt performance. I would look at and SCT Xcal like hvac guru suggested, even running 87 there are gains to be had. IMO SCT is the best tuner on the market for Ford trucks, gassers anyway.
New User
Joined: Nov 2008
Posts: 24
Likes: 0
also 90% of the pcm codes in superduties are very slow to got into closed loop-most never do except at wot,superduties gain much part throttle tq a quality custom tune
Trending Topics
Former ******
Joined: Nov 2004
Posts: 4,901
Likes: 2
From: Salt Lake City, Utah
O would think you could gain a good amount of power with a tune, but you would also probably have to run a higher octane fuel to get the most out of it.
The factory y-pipes are aweful. The merging is not reallt the problem either, its where they merged it. There is no practical benefit to merging the pipe going into the y. Ford does it to make manufacturing cheaper. I'm not sure what the '08 system looks like, but the previous years were awful. But the biggest choke point is the muffler, and replacing it is where you will see your biggest gain.
The factory y-pipes are aweful. The merging is not reallt the problem either, its where they merged it. There is no practical benefit to merging the pipe going into the y. Ford does it to make manufacturing cheaper. I'm not sure what the '08 system looks like, but the previous years were awful. But the biggest choke point is the muffler, and replacing it is where you will see your biggest gain.
FTE Stories
Ford Trucks for Ford Truck Enthusiasts
Rezvani's Latest Post-Apocalytic Monster Is a Ford F-150 Raptor Underneath
Verdad Gallardo
Top 10 Most Expensive Ford Trucks Ever Sold on Bring a Trailer
Joe Kucinski
2027 Ford Super Duty Buyer's Guide (Every Model, Engine, & Package)
Brett Foote
Top 10 Ford Truck Tragedies
Joe Kucinski
AEV FXL Super Duty - the Super Duty Raptor Ford Doesn't Make
Brett Foote
Lobo Vs Lobo: Proof the F-150 Lobo Should Be Even Lower!
Michael S. Palmer
Ford's 2001 Explorer Sportsman Concept Looks For a New Home
Verdad Gallardo
10 Best Ford Truck Engines We Miss the Most!
Joe Kucinski
2026 Shelby F-150 Off-Road: Better Than a Raptor R?
Brett Foote
Hotshot
Joined: Mar 2007
Posts: 10,101
Likes: 40
From: Pa
You have your loops mixed up though. The stock tuning doesn't allow open loop at WOT. The truck runs in open loop for a little after startup then goes into closed loop and stays there.(Will switch to open loop during hard engine braking when the injectors are shut of) With a good tune at WOT the truck goes into open loop.
Thread Starter
|
New User
Joined: Nov 2008
Posts: 4
Likes: 0
Thanks for the help guys. One more question for you....The exhaust, I am going to put either a flowmaster 44 or a gibbson. Which one do you guys prefer and what would you run for pipe size? Factory is 3" which will stay the same, but the dual outlets on the muffler...should I go 2.5" or 3.0". I will be dumbing them both out before the rear passenger side wheel. I keep hearing the 3.0" is to much and will hurt my performance...is this true should I go with the 2.5"????? Thanks
