To All:
I have a 2008 FX2 Supercrew w/4.6L. I want to make some hp gains to it after my tour in Japan is done. I haven't done a thing to it b/c I PSC'd right after I bought it. Here is a list of thing I would like to do:

-Custom Exhaust, maybe 40 series Flowmaster duals
-Custom Tuning, maybe Diablo or Superchips
-Would love to supercharge it if there is a SC out there

If anybody knows any SECRETS or tips, I'm all ears. I'll take any suggestions.

Thanks!!!!!!!!!!

 

procharger

 

I would scrap the Flowmaster idea if you want horsepower. Same goes for Super Chips, but I'm not too familiar with Diablo tuning. If you want to make power from an exhaust, true duals is the name of the game.

2.25" or 2.5" mandrel bent pipes (2.25" for low end torque, 2.5" for peak horsepower)
High flow cats
X-pipe
Straight-through mufflers (no Flowmaster/Cherry Bomb/Thrush)

Also look into long tube headers. A company finally makes a set for the NBS F150's that stainless and fits. http://www.stainlessworks.net/cart/i...82_439_499_539

There is a company that makes a positive displacement blower for the 2 valve 4.6, but it's designed for Mustang GT's. It will work on a F150, but you would be the guinea pig.

You should also look into a rearend gear swap. I would suggest 4.30's.

 

Here's the link for Tork Tech's blower.

http://shop.torktech.com/99-04gtnon-...argerkits.aspx

Kenne Bell's too

http://www.kennebell.net/supercharge...2v/gt96-04.htm

 

As far as performance goes in terms of exhaust, you won't be able to tell too much of a difference...speaking in brands of course (Magnaflow vs. Flowmaster, etc.). You will see better numbers on a dyno with the straight-through mufflers, but it shouldn't be enough that you would feel it. Like Punisher said, though, your hp gains will come once you move into true duals and get some long tubes.

4.30s might be a little much for stock tire size...hwy mileage would suck to say the least. 4.10s at the most; just ask migdaddy - I saw him post that he got 13 hwy mpg with his 4.10s ...But you will feel quite a bit more power down low.

 

Non of that crap is any good without a custom tune. Shoot, you might as well leave the way it is without one.

 

exactly












also read this thread


https://www.f150online.com/forums/ar...wap-notes.html

 

He can't swap in a 5.4 unless he wants to swap out the transmission and rear axle.

 

http://www.summitracing.com/parts/TFS-K519-380-375/

Here is a set of trick flow heads, cams and timing set.

 

Very good answer!!!

You have to get the air in before you can worry about it coming out..

with all the restrictions on the front nothing but a set of underdrives wil let you feel any thing.

I know we are not talking about a 347 AL stroker but after I put my first set of heads on my Mustang I was sold.

Good job on the parts look-up. I'm going to check that out now.

As far as "true duals" if you wanted to keep it like it is go three inches at the y section a three inch tube will equal 2 2.5" tubes.

 

Let's get realistic about this vehicle and engine combination. You're talking about an approximately 6000 pound vehicle that we are trying to accelerate here. Sure, you could do a lot of work and throw tens of thousands of dollars into this vehicle to get great performance, but how much are you looking to spend, and how much performance do you want?

Let's look at what you were asking about, and my recommendations from years of experience and HARD lessons.

Exhaust: Yes, you could go with the headers mentioned in a post above and dual 2.5" exhaust, although I would be more inclined to use 2.25" tubing myself for the better low end torque. I am not a big fan of headers in this application unless supercharged. I would definitely add Magnaflow cats and an X pipe, and I prefer Magnaflow or other flow-through style mufflers to chambered mufflers like Flowmaster. With the weight of the vehicle in question and the size of the engine, I would do everything I can to keep every last ounce of low end torque. This would be the FIRST thing I would do.

Intake: You really could not go wrong with the Gotts mod for the price. I personally prefer a CAI, because I like the looks better than the stock intake system. This would be the SECOND thing I would do.

Tuning: I would really look into the PHP Gryphon or an SCT with custom tunes, I would make sure that the person writing the tunes understands that you want to have more low end torque to move the vehicle, similar to a towing tune. I would do this THIRD in my list of things to do. I would also talk to Bill at PHP (www.phptune.com) or Justin at VMP (www.vmptuning.com) about your vehicle and intended useage. Either of these people can write you a great tune for your vehicle. This would be the THIRD thing I would do on my list.

Superchargers: I, personally, would pass on them. Not only do you have the cost of the supercharger system itself, you will have to rebuild and improve the transmission to handle the improvement in torque caused by the supercharger, and look at further improvements in exhaust flow. This is something many people do not tell others about supercharger installations. Sure, you can "get by" with a stock transmission, but for how long? And where will you be when the stock transmission fails? Again, this is my personal opinion, a supercharger and all that needs to be properly done for a good installation is not cost effective to me.

Some other things I think need to be addressed that were not brought up previously that have an effect on performance, and I will address them now.

Gearing: I'll make this very easy to understand, without any complicated algebraic formulas, from what I have found worked for me for over 30 years on various street vehicles. The easy way to determine what would be good for a vehicle is to take the diameter of the rear tire, and divide it by 8 for a good start. If low end torque without concern for highway speed is what you are after, divide the tire size by 7.5. Using an example with 30" tires, dividing by 8 gives us 3.75, with the nearest gearing being 3.73. Dividing by 7.5 gives us 4.00; here you could use a 3.90 gear or a 4.10 gear, depending on how much low end acceleration is important to you. At 2000 RPM in overdrive, dividing by 8 will put you at 68 MPH, dividing by 7.5 puts you in the 62 to 65 MPH range. I personally would only consider this if after doing the above, the acceleration is still not what you want, or you have larger diameter tires than stock.

E-fans: I use a Flex-A-Lite 270 electric fan, and absolutely love it. Removing that engine driven fan clutch and fan woke the engine up. It accelerates easier now, and replacing the serpentine belt is SO much easier without the stock fan and shroud in the way. I highly recommend this, and would put it at FOURTH on my list of things to do.

I would consider other things like camshafts, heads, etc. ONLY if you want to get rid of low end torque (which most performance camshafts do), or in the case of the supercharger, you are ready to also do the transmission improvement and headers to complement the installation of the supercharger. A good link on what to do for transmission improvements is this:

http://tccoa.com/articles/tranny/tra...on/index.shtml

If this were my vehicle, I would stay with the stock exhaust manifolds, use Magnaflow cats, 2.25" tubing to an X-pipe, and Magnaflow mufflers. I would then do the Gotts mod or get a CAI. Next would be a good tuner with performance tunes, then I would do the E-fans. After this, I would do some long term evaluation of how much improvement was made before I went looking at headers, gearing, superchargers, or any other aftermarket engine performance products. This comes from over 30 years of working on various street vehicles, and many HARD learned lessons. I'll give to you free advice that took me many years and thousands of dollars to learn.

I apologize for the length of this post, but I wanted to cover all bases on performance improvement correctly, and add other useful information that you or other posters may not have considerred or covered. I certainly hope you take this information and use it wisely on your vehicle.

 

never mind...

 

Diablo makes a great tuner too BTW.

 

most people don't know this but SCT stands for "Superchips Custom Tuning" and he wanted a custom tune, i'm just saying

to the OP the both the trickflow top end kit is gonna be your easiest and cheapest route for more power. i did the math once before i bought a mustang and the kit, tunes required to run it, injectors and MAF (MAF not needed but worth it) will run you about $4000, the superchargers that 4.6 punisher listed are also good ways of making power, how ever these are for mustangs and not truck, but they can be made to work, on the trucks just costs more money.

 

I must have missed that sentence. When I see "Super Chips" and not "SCT", I get pissy.