Apr 13, 2015, 12:41 PM
Last edit by: IB Advertising
Interested in increasing the horsepower in your 5.4L? Forum members suggest various methods to increase horsepower. The methods include:
Read the full discussion below to find out the preferred methods.
Read the full discussion below to find out the preferred methods.
Increasing 5.4L Horsepower
Senior Member
Joined: Jan 1999
Posts: 7,030
Likes: 3
From: WINDSOR, ONTARIO, CANADA
HI!... I gained 19RWH.P with the install of KOOKS SS LT headers. This was on a full bolt on 5.4 N/A. (251RWH.P/330RWTQ at 200,000kms)That was with stock heads and cams. I installed the same headers on my built 5.4. Don't know what increase they gave me on it. But it was 8.0:1 compression with turbo grind cams (engine was built for turbo set-up) and in N/A mode made 354RWH.P and 392RWH.P. So yes headers work even in N/A trim.
Senior Member
Joined: Dec 2002
Posts: 1,558
Likes: 3
From: Eastern TN
Originally Posted by MGDfan
Well, the problem could be in the tuning, or the combo, or both, because this fella has tuned thousands (not hundreds) of mod motors:
http://www.troyerperformance.com/cgi...gno=122-842230
When he says 30rwhp, I tend to believe him. Impeccable rep.
MGD
http://www.troyerperformance.com/cgi...gno=122-842230
When he says 30rwhp, I tend to believe him. Impeccable rep.
MGD
Did you happen to notice the part about "boost" level in the HP statement for the sales brochure ?? What do you suppose that level is in N/A trim ?
More air in means more air out - simple enough.
A boosted engine flows more air - period. Hence the part about a boosted engine seeing a better increase from headers than a N/A one...
Never mind the physics - keep arguing...
Member
Joined: Jul 2012
Posts: 10
Likes: 1
From: Florida
Hey buddy i also have a 99 with the Triton i have it supercharged and performance plugs and am knocking on 430 with just supercharger alone! Def worth the money and mine has 38's on it can only imagine what it would do with something that low to the ground!!!
Senior Member
Joined: May 2004
Posts: 577
Likes: 1
From: Longmont, CO
Just because the thread disappeared 5 years ago doesn't mean the thread can't be added to. If you go to the general discussion area, you'll find a thread that has been going for well over 5 years. Give the guy a break! 
Technical Article Contributor
Joined: Oct 2005
Posts: 25,641
Likes: 19
From: MI
Glad this one was bumped to the front. It's a pretty good read. It kept me interested enough to read every post lol. I recall when this thread happened, I just installed LT's on an 98 non-PI/NA 5.4L. The 98 is still running the factory tune lol. Never touched the tune in that truck and still have it. Man, I wish I would have Dyno'ed before and after the LT's. I don't know how much I gained, but recall it was a noticeable improvement. I picked up 6 seconds from 0-80. The 3" X 2.5" HF's were welded directly to the collectors. Mandrel crossover/Nothing over 2.5" from the cats back. SISO/Magnaflow muffler/Factory TP. LT's alone helped my old girl. I was around 200,000 miles before they went on.
I wish all of these guys were still around. Good thread to read.
I wish all of these guys were still around. Good thread to read.
Glad this one was bumped to the front. It's a pretty good read. It kept me interested enough to read every post lol. I recall when this thread happened, I just installed LT's on an 98 non-PI/NA 5.4L. The 98 is still running the factory tune lol. Never touched the tune in that truck and still have it. Man, I wish I would have Dyno'ed before and after the LT's. I don't know how much I gained, but recall it was a noticeable improvement. I picked up 6 seconds from 0-80. The 3" X 2.5" HF's were welded directly to the collectors. Mandrel crossover/Nothing over 2.5" from the cats back. SISO/Magnaflow muffler/Factory TP. LT's alone helped my old girl. I was around 200,000 miles before they went on.
I wish all of these guys were still around. Good thread to read.
I wish all of these guys were still around. Good thread to read.
Member
Joined: Jul 2012
Posts: 10
Likes: 1
From: Florida
Yeah man I do im at work but when i get home ill post some pics to the thread of the truck and charger under the hood.
And thanks to all those who commented i didnt know there was an age limit on post hahah
And thanks to all those who commented i didnt know there was an age limit on post hahah
Member
Joined: Apr 2013
Posts: 21
Likes: 0
I think out of all the upgrades ive installed so far the underdrive pulleys and throttle body added the most noticeable difference the truck revs and performs alot more aggressive. I have the FlexALite fan kit sitting right behind me but I'm debating sticking with the stock fan clutch setup
Senior Member
Joined: May 2004
Posts: 577
Likes: 1
From: Longmont, CO
Swapping to LT headers and true dual exhaust is still the best mod I've done to my 99 5.4 F150. I haven't tuned mine so you do lose a little off the line torque, but mid and top end power is VERY noticeable. Future plan is to replace the stock fan with 2010 electric fans and radiator
Junior Member
Joined: Apr 2016
Posts: 5
Likes: 0
Hp in 5.4 Triton
This is yrs late, but I would save more on top of that 3k. 2k more for $5k promar would square you a way with a built long block support of 18 lbs of boost . Not bad if you ask me , I have a 2004 f150 5.4 3v , they ( promar ) has one for me to. And stock my truck is 300hp and 365ft torque and then add my boost of 18 I'm pushing 650hp. 15 psi of boost will double the the base horse power... They have them up to 24 psi of boost but are like 10k with all 1 yr warranty. They kind of call them their revised lightning.
Junior Member
Joined: Oct 2018
Posts: 1
Likes: 0
What the rough cost of all this?