Here's an example. Try getting 17 -18 psi out of a pd blower.

https://www.f150online.com/forums/sh...d.php?t=254980

 

My friends 03 KB 2.6 Cobra is putting out 21 lbs of boost with no problems . I only need 6-8 lbs of boost to get the performance and torque #'s that I need for my truck. But the lighting in the link is making good #'s.

 

id love to have a kb myself but not til go built block. for sure dont forget mikes custom tuning when u get that twin screw on

 

Hi Rusty,

I agree with others in that with the mods you originally listed, you will not hit anywhere near the power numbers you listed in your original post – not even close. Nor do we claim any such thing - what we post about our gains is indeed accurate and dyno tested, we don't make them up out of thin air.

Additionally, we do not advertise a 40-45 HP gain on a 4.6 F-150 from just tuning alone - that isn't going to happen from tuning alone on a stock or lightly modified 4.6 2V truck motor, either.

You need to remember that your stock power numbers are SAE Net at the *flywheel* - not at the real wheels. A 4.6 automatic making 231 HP at the flywheel is going to put down *maybe* 150-160 at the rear wheels stock – if you are lucky, and most of them cannot even go open loop, so they don't even make their stock rated power in many cases. And even if yours *did*, it would still take a gain of at least 200 HP to the rear wheels to get what you want to make, and even a blower is not going to get you there – not any blower, not at any boost level that the stock pistons would ever stand up to, as they just don’t have enough thickness in the ring lands.

To get 360 HP to the rear wheels (which is more than any stock Lightning has ever made on an accurate dyno by the way) on your truck, you would need to make about 440 at the flywheel – and we also have to take into consideration, in terms of keeping the engine alive, the HP required to turn the blower, which will be anywhere from another 60 to another 100 HP – so the engine would need to produce roughly 500-540 HP *internally* to get 440 to the flywheel, to get the 360 to the tires on your truck. To get to *that* kind of power level, figure that you are going to need a custom version of our Stage 5 package - our "standard" Stage 5 package for your truck adds roughly 175-190 HP at the flywheel, as a conservative rating - some of course do gain a bit more. And that is at only 5.5 PSI boost, for example. About 150 RWHP gain is the number from our currently listed Stage 5 setup (which is about to be upgraded & thus make more, but for right now we'll just discuss what is currently listed for our Stage 5 for the 4.6 truck).

We can supply everything that is needed to get there, but you will have to be realistic about the power levels you can actually make and still keep a stock engine alive, as well as the costs involved, as it’s going to take more than just a blower, my friend.

If you’d like some help going over all of this to get an idea as to what the reality of all of this actually is, please feel free to give us a call, and good luck!

 

Thanks for clearing all of the ?'s and HP#'s up. As far as the stock engine goes and the pistons and rings, what kind of HP and TQ #'s can be attained on a 2003 FX4 with the 4.6 and auto with the 2.2 KB @8lbs of boost, E-fans and the MangnaFlow SISO exhaust. All I really need is around 300-350 ftlbs of tq at the rear wheels. How hard will this be to acheive?

Rusty