3 Questions

What is the horsepower of a 2001 SCrew with a 5.4L engine?

Approx what is the increase in HP with an Airraid system ??

What is the approx HP gain from true duals (2.5 in pipe & dynomax Mufflers)???

thanks......

Just trying to approximate..........

Mike


PS
also just for grins where does one go to get there truck measured on a dynometer???

 

To gain noticeable horsepower, you would need to tune the whole exhaust system and the engine to-gether. Air filter mods may give you a slight increase, but you might only be able to measure this on a dyno. You could not possibly notice a difference from driving. You may be led to believe that a better sounding engine is producing more go, but this is only a perception. We all want more rock'n roll from our exhaust systems. Theres nothing wrong with this, but dont equate noise with performance. Do you want noisr or grunt? If you want more grunt, buy a chip..........I've been building and modifying engines for over 35 years and I know what is needed to set the horses loose. If you really want to go to town, do the whole bit, but dont listen to the, 'gee I just installed a whatever exhaust and my truck now does 0-60 in 7 seconds' brigade. They are full of it.
Again...buy a chip, unless you want a very big boost, but that means a strip and re-build to fit new engine parts, and that costs.
Regards,
Hughie

 

In my opinon from experiance, you WILL notice a diffrence with just the air filter. As far as the exaust goes, you may not notice much of a diffrence if any other than that really cool exaust sound.

But remember as you force more air into the engine up front having the better exaust will allow it to breath easier making everything a bit more effecient. And thats what you want.

The stock horsepower on the 5.4 is 260.

 

dcovell
force more air into the engine ??????? take your head out of your ****. Superchargers and Turbo chargers put more air/fuel mix into the induction system, but a normaly aspirated system takes its air at atmospheric pressure. If a different filter allows a greater passage of air, and the mixture is enriched to take advantage of that, then there may be a small gain, but at the expense of gas mileage. A greater passage of air must also allow a greater passage of dust particles, which will necessitate more frequent oil changes.
Does anybody who makes aftermarket filters want to guarantee a performance gain without loss of filtration or mileage? WHY DONT FORD FIT THEM AS STANDARD? Much easier than paying an army of engineers to increase the power of next years model by 5%.
PS. Would you like to come to my house and play poker?
Can hear the bugle now.......could be the last post

 

dcovell
please accept my apology.....my last post was plain nasty, and it's been buggin' me all day. That isn't me!
Hughie

 

Actually I belive K&N would make all three claims, no idea if there all true though, although I wouldn't necessarily assume there not. As far as why ford doesn't fit them as standard, I think it all comes down to the price. I have no doubt if you were willing to pay for it, that ford's engineers COULD design a better air filter that flows better, but the paper filters they come stock with are cheap and do the job just fine. From Ford's perspective, why spend 500% more on a better filter and eat away at profits when the one you've got works just fine?

 

Wow, I guess, well thanks for the apology. By meaning more air in the front, I do belive the engine (although not that much more) will be able to pull more air in when the filter causes less resistance.

Oh and apology accepted. By the way you can edit your post for future reference...

 

Mikebike...

Did you post under the Computer Chip Forum? Many have asked this question before and Mike T. (Superchip Dist.) has provided some good advice. Might try there if you haven't already.

Good Luck!

 

Hello Everyone,

To give you an idea of what these types of mods actually do add, here are some numbers for you................

1.) Drop-in K&N air filter in the factory airbox: 4.6 or 5.4 motor, about 4-5 horsepower. Given the 2-ton+ weight of these vehicles, it's a safe bet that you really aren't going to feel that small of a gain in the seat of your pants. In the 4.2 V-6, the gain is about 3 peak horsepower, sometimes 4. If you also do the "shadetree" airbox mod mentioned in the article here, you pick up another 2-3 more horsepower in each engine.

2.) Airbox elimination kit - K&N FIPK kit on a 5.4, 14 horsepower, on the 4.6, 12 horsepower. Airaid brand kit: same as the K&N FIPK kit's gains. Air Force One: 17.9 hp on the 5.4, 15 hp on the 4.6, and 12 hp on the 4.2 V-6. Here we're starting to be able to feel the gains in the seat of the pants. Not "big" of course, but certainly respectable for the price. The best airbox elimination kits are generally the #2 best bang-for-the-buck mod on most of these vehicles.

3.) Exhaust modifications - ahh, and here's where things get *really* interesting, as most cat-back systems, the vast majority of cat-back systems for these trucks & SUV's cause a noticeable loss in torque, even though they all gain some horsepower at higher rpms & heavy throttle openings. Your typical Flowmaster cat-back on the 5.4 gains about 12-14 hp, as do the Gibson models, with the Swept-Side system doing a better job in torque than the fake duals. The system that we see showing the best gains is the Magnaflow, at 22-23 hp for the 5.4 motor, 17 of that getting to the rear wheels. The Magnaflow system was also the only system to actually increase low-end torque, where almost all others lost low-end torque, usually on the order of 20-30 lbs./ft. from just above idle thru 2500+ rpm. Right now, Magnaflow is doing the best job of flow engineering in cat-backs for these vehicles, being the only one to add torque down low and getting the highest raw horsepower gains to boot. That is a clear shwing of their superior flow engineering. However, keep in mind that the vast majority of aftermarket cat-back systems deliver gains in the 12-14 hp range on both 4.6 & 5.4 F-150's & Expy's, we've not seen another exhaust get the numbers that Magnaflow is getting. In the October issue of Truckin', there was a dyno test of the Magnaflow on a 5.4 Super Crew, and they got 16 hp to the rear wheels, within 1 hp of what we saw. Of course, you pay for that superior flow engineering, too.

I agree with Hughie in that a top-shelf performance chip will deliver larger gains than intake or exhaust mods in these vehicles.

The Superchip will deliver as much of a performance gain as both your average K&N or Airaid airbox kit and most cat-back systems combined. In most computer controlled vehicles, your single best bang-for-the-buck comes from having the powertrain programming optimized.

Some people just can't afford to do a complete airbox elimination kit, and so have to go with a drop-in K&N air filter. It all works to reduce the restriction in the air intake tract, just to a lesser degree.

You have to do what you can afford, is the bottom line, which is why we're so focused on bang-for-the-buck here at Performance. I thought I'd drop by & just give you some rough numbers for the nost common intake & exhaust mods, I hope that helps a bit.

Enjoy your weekend everyone,

 

Hey Superchips_Distributor,

Now that is some quality data without any speculation. Too bad not many of us are able to deliver data like that when we comment or make suggestions. We are able to give subjective results from our perspective and sometimes that is all that is needed.

A fair amount of respondents usually are on track and know, for the most part, what is going on but have no real test data to use as evidence to back up their statements.

I was surprised to hear you say that a different air intake could give me 14 more horsepower using the FIPK and 17.9 usnig the Air Force 1 when running in a 5.4L.

My interest would be can I get more power and keep the fuel consumption about the same as stock, ie better efficiency? I know that if you generate more HP with some mod and your efficiency doesn't change then higher fuel consumption will result from production of more power.

Can you please comment on power train efficiency and does the Super Chip improve it? If I can increase my power train efficiency, then I might be in the market for one of these mods for sure as long as the costs are not too outrageous.

Thanks for all the info, I'm sure that's a real learning experience for most, me included.

DaveMan