How much boost are you seeing to pull the 560whp. Any idea how much hp/boost the long tubes and bigger to added? Are you able to go to smaller pulley for more boost?
Your truck is pulling about 80whp more than my truck. I ran mine on the dyno with big heavy tires and factory beadlock as well but have stock Roush TB and factory headers etc. even at 560whp I would be pretty happy for 91 pump.
I'll be honest I find it pretty hard to check my boost gauge at WOT. I THINK it's typically pretty close to 10 psi at WOT at the mid range. I don't know if it creeps up past that at higher RPMs.
I did just do a pull out on the open road out East this weekend and wanted to check my air/fuel ratio. The CPU seems to target 12.2 but I saw it get as low as 11.8. I think this is somewhat conservative and consistent with what my tuner told me he was targeting.
I am currently running a 3.125" pulley. There are Whipple pulleys down through 2.75". I am not inclined to go any smaller than my current pulley, as there doesn't seem to be a need to do so (and certainly not on a stock bottom end). MTF's truck made 560 at the rear wheels with full stock exhaust and a 3.25" pulley on stock tires.
I feel like this Gen 3 rotor kit making the same amount of boost more efficiently with my setup is going to make a lot of power.
I would definitely think that headers and a TB would get you at LEAST 50 more horsepower. Although drive-ability with my mono blade was recently improved DRASTICALLY by a new tune from my tuner, I still don't recommend it. In your case it seems like the Ford twin 65 is a good fit.
---------- Post added at 11:00 AM ---------- Previous post was at 10:55 AM ----------
The PCM says I'm doing around 10 1/2 psi. boost. Don't know what the Gen3 upgrade will do but I post it when it's done.
Just saw this. I think this confirms my ~ 10 psi guesstimate, as it makes sense that we would be making roughly the same amount of boost even though I am a pulley size down, given the larger TB and headers on my truck.
And, if I remember correctly, that was your theory when my truck went in for the build. Good stuff.