04 f-150 new longblock 10,000 miles ago 47 lb injectors new plugs and o2 sincers powerdyne bd11a sct x4 tuner supercharger. I bought the truck with the longblock,injectors,supercharger, sct x4 already on the truck. I felt like it wasn't making the power that it should be. I was expecting 400ish rear wheel hp. So I took it to a local tuner shop who deals in the sct tuners and also has a dyno. As I was expecting it only hit 200 hp. Also I put a boost gauge on it for my self at idle the truck has 18 lbs vacuum tap the throttle it goes to 0 it doesn't start start to boost at all till about 4500 rpm's hits 6 lbs by redline. Any ideas?

 

That sounds like th issue....at 4500 you are at the top of the power band and the race is over......

 

Well it pulls to about 6300 but still no power gain over stock.

 

Check the blower belt, make sure it's tight. If that's good, then it may simply be the pulley combo you're using. Going with a smaller blower pulley and/or larger crank pulley will spin the blower faster which makes the boost numbers higher and come in a little earlier, at WOT. The BD-11a should make a very noticeable difference, but not quite the same increase you would see compared to an S-Trim or Novi.