Have any of you guys dyno'd your stock 5.4 2v? Im curious to see the stock numbers because all the spec websites state 260hp/350tq but who knows if thats at the rear wheels or flywheel. i know you loose 20% or something through an auto driveline

 

That number is at the flywheel as are all advertised HP and TQ numbers.

 

Oh so i have around 206hp.. nice...

 

yeah i know... it is depressing isnt it.i wish there was a way to get more power but i dont think all the add on stuff that is so expensive is really gonna make a difference but maby someone can tell us that i'm wrong.

 

It sure isn't enought to impress anyone. That's for sure. The least expensive way to get more horsepower is to spray it. After that, you could go with a turbocharger. And after that ???? Get a bigger motor.

 

Try a different muffler set up. It could add 20-25 hp to your superduty. Flowmaster 80 serries isn't too loud and helps fuel mpg's on the superduty.
I have an 07 F-150 that has ran dyno at 346rwhp with a k&n and different muffler. Before it was 301rwhp.

 

301 RWHP on a stock 5.4l?? Only had 300 at the flywheel.

 

That is an impressive number. Ford must really be underrating our engines in the horsepower department. That is a great improvement for that little bit of modification.
In all honesty I think the dyno or it's operator was half a bubble off.

 

Supercharge it!
You can put a Lightning intake assembly on the 5.4 and make great power with about 3 to 4K.
With the right pulley setup you could have 400rwhp.

 

sorry but I am doubting a 20hp gain from just swapping a muffler...I have a flowmaster 50 and don't get me wrong i love the sound but I am pretty sure the affects are negligible

 

Yep - where's the BS flag?

Oh, here it is.

 

X3