I'm stepin off - later fella's - happy holidays. :santa:

 

Hi.

This thread is long past due being moved to GD (General Dementia)... with a few notable exceptions, IMHO-Ho-Ho ...

Oh - on topic: 5.4 - no questions - had both - would not go back. Never mind what peabrain says

Cheers :santa:
Bubba

 

yeh a 5.4 3v with a whipple makes less power than a 4.6 with a turbo.. u just proved my point

 

dont forget to adjust your power bands and regrease the Z-joints

 

dude thats forcing air down its throat... thats not real power!

 

i win!

 

i know im just making a point that they have the potential to make alotta power with a small amount of boost

 

woo hey i found mahle pistons... now its time to gather more info and decide on which piston set to go with.
3.551" X 3.543" X 5.930" 0cc/16cc
3.571" X 3.543" X 5.930" 0cc/16cc
3.581" X 3.543" X 5.930" 0cc/16cc

 

Boost school is now in session. Your tuner is full of crap.

If an engine, a stock engine, can make 225hp at the crank at sea level, that engine _could_ make an absolute maximum of 450hp at 14.7psi (+1 bar). Static pressure at sea level is 1 bar, or 14.7psi. If you are running 14.7psi boost (+1 bar), pressure is doubled, and so is density. In a perfect system, 14.7 psi of boost could produce 450 hp max (exactly double the N/A hp), period, never more. In order to double the horsepower with +1 bar, the boost system (turbo in this case) must be 100% efficient, and turbo's, while much more efficient than their supercharger brethren, are not 100% efficient, it takes some horsepower to operate. Real world turbo loses can range anywhere from 5-20%, every turbo is different, every trim is different. That places actual hp (if we split the difference and say 12.5% loss) from a 225hp engine on 14.7 psi at 394hp (with a theoretical max of 450 in a lossless system).

In order for your "tuner" to get 489 rwhp out of a 4.6 with 10 psi, IF the turbo was 100% perfectly efficient, the motor would have to turn out 280 rwhp on it's own, N/A. There isn't any F150 anything with a stock 4.6 on the face of the planet that can do 280 rwhp N/A.

Wait, it gets worse....

If we calculate that same 12.5% loss from the turbo, the motor would have to generate almost 320 rwhp N/A to generate 489 rwhp under 10 psi of boost. I am equally unaware of any F150 that came with a stock 4.6 that made 320 hp.

Boost has rules, and they all work on PSI. To calculate base gains at sea level without taking loss into consideration, divide actual boost by14.7 (10/14.7=.68), multiply that number by the engines base hp (225*.68=153), and then add the total the base (225+153=378 378 is the max lossless hp from 10 psi on a 225 base hp engine). In actuality, a really good stock 4.6 F150 cranks out only about 180 rwhp. On 10 psi with 0 loss, a max hp of 302 rwhp is all it will ever do on 10 psi, ever.

Like Neal for instance. If he is making 360 rwhp, on 10 psi, with 0 loss, he would be making 604.8 rwhp. With loss calculated, (also assuming there are no restrictions on the intake, exhaust, etc), he would be making 531 rwhp.

Sorry dude, your tuner's blowing smoke up your butt.

 

hmm thats some good reading.

how about them pistons! lol

 

The differenst sizes are overbores. The first is stock, the others you listed are for 20 over, and 30 over bores.

In case you were wondering, the 16cc part is the volume of the piston's inverted dome, or dish.

 

Well, there is slightly more to it. Cam profiles, runner volume, port volume, valve sizes, exhaust efficiency, etc. all come into play. Efficiency is king in boosted apps. But in the interest of time, and space (it would take several pages to run through it all), I kept it just to the basics of boost and it's principles.

It's just important to realize that the head, exhaust system, etc. are all moving the amount of air as a very big N/A engine, so you must keep that all in mind when picking out your parts. Going with a bigger exhaust valve, a split cam that's heavy on the exhaust side, etc. all help keep those losses down.

 

-16cc knocks the c:r down a lot by its self doesnt it?

 

With the 4.6, every 3cc is equal to .5 CR. It should be noted, however, that the factory pistons are also dished.

 

HI!... That would be 354RWH.P all N/A baby!!!!!! LOL!