bigsols05blackwidow

Okay, so I don't know much about boost and how much I need to do in order to run over 450hp. I think that I need new rods and pistons, but i'm lost as for what else I need. I'm going with a On3Performance kit 70mm kit, and i'm possibly replacing the turbo with a Garrett gt35 with tial 3053 exhaust housings that I can get for $450. So what all will I need?

bigsols05blackwidow

I was also told that I can use Boss H-rods from the 5.0, but I don't know.

UPRSharad

I wouldn't necessarily choose that turbo kit.

Fwiw, UPR's 2010 GT has a forged 4.6 3V stroker with a Roush TVS2300 blower making 17lbs of boost. The car made 701rwhp and runs 9.90s in the quarter mile on drag radials. (and UPR suspension, of course) It is an absolute riot to drive on the street too!

danzcool

It takes less boost to make power with turbo(s) than with superchargers. My car made 567RWHP on 11psi (stock motor, just JBA shorties and FR 62mm throttle body). On my current setup (9.5 compression, 4.75L built block, ported head, and turbo cams) it makes 757RWHP on 16psi (and 91 pump gas).
So I'd guess you'd want right around 14psi to hit your goal.
You need to make sure your fuel system is up to par as well as the injectors, lowering the compression ratio will allow you to reach higher numbers with pump gas. Getting a good tune from someone who knows how to tune for v8 turbos is kind of critical.

You need forged rods and pistons and probably also a forged crank at that level.
Forged crank means you'll need an 8-bolt flywheel. You'll need a clutch capable of holding all that torque, and at least a hardened input shaft for your transmission.