Some of you might now that I have recently installed the Roush s/c on my F150. As of yesterday I just installed a magnaflow true dual exhaust set up. You may laugh, but my goal is to have this truck running SRT-10s into the ground. The Roush set up is rated at 412hp 465tq all at 6psi. I have yet to dyno my truck but the avg of what I've seen is 360rwhp and 405rwtq. I was told by several local tuners that I could possibly add another 150hp to the ground if I were to run 12psi with a custom tune. Do you think this is realistic? How much psi could I safely run, or how much psi should I run? In order to do something like this I am obviously going to have to upgade the pulley system. How would you recommend I go about doing that? And how much would an upgraded pulley system probably cost? I know you are all thinking... "Even if you get up to 500+rwhp how are you going to convert that power to the ground." As of right now I have nothing done for better traction except for the fact I have 4wd which will help me launch out of the hole...... What do you guys think?

 

I would be HIGHLY surprised if these stock blocks could take anything more than 430-450RWHP. If you're talking about forging it and throwing it at 12 PSI, you're also going to be close to overspinning the blower and creating hotter air that isn't flowing as efficiently. I really don't think M90's were meant for much more than 8-9 PSI, and I wouldn't even try to get there without an intercooler.

I think if you add the intercooler in January or whenever Roush comes out with it, you'll see another 30HP/45TQ maybe, but at least with that you might be able to safely swap the pulley to get 8 or 9 PSI. I wouldn't go above that though, unless you can speak to someone with first hand knowledge of how well these engines will hold up and to how much power.

As far as pulley, there was a guy on the Roush forum I'm on who used to make them, they were meant for the Stage 3 Mustangs, but I am almost positive it's the same exact blower, just with a longer snout. Roush eventually started using (and maybe manufacturing) the pulley and started putting them on their 440A cars. The pulley bumped the boost from 6 PSI to 8 PSI, and up to 9 PSI with a good, cold air intake tube.

Here is the pulley for the Stage 3 Mustangs. I really can't tell you if it will work for sure without seeing some really good pics of your pulley, snout, and how it mounts. I ASSUME it should work, but I really don't know. Also, do you know the size of your stock pulley? I think it's 3.0, and this is 2.8. http://www.stage3motorsports.com/product/R07050005 or http://www.stage3motorsports.com/cat...ng9404.engine/