Roush 588 cu in R motor

[twin turbo]

Originally Posted by Joe's Garage

I would say true up to 450 RWHP, after that anything more is 99% bragging rights and 1% "useful" to the very few who are in a situation where they could actually use more - like a drag strip. If that's your gig, then just build a gasser and be done with it On the street with two guys of equal driving ability, the guy with an aluminum 450 RWHP windsor can run against any size BB/high HP/torque monster and win a 0-100 mph sprint. Make that a race through 20 miles of twisties to your favorite lunch spot, then tell the windsor guy what you want and he'll have the sandwich waiting when you get there.

That's how I assess getting from point A to point B faster

Respectfully, I have to disagree with these statements. For proof just look at CSX3170. He is running a high hp big block that's putting out well over 600 rwhp, pulls 1.45 G's in the corners, accelerates up to 1.2 G's. Pretty amazing stats and balanced performance in a chassis that's not as stiff as most of our Replica's (although his is extremely well sorted). It's all in the set-up.

I'm very fortunate because I can vary my hp setting over a 200 rwhp/tq range by simply turning a dial to control boost levels. This allows me to objectively see where traction thresholds are for any particular day (warm vs cold air temps, road surface quality, etc), and a G-tech RR meter to measure acceleration and handling parameters. Believe me when I say that greater than 450 rwhp/tq on the street is usable. If it wasn't, I would have gotten bored and sold my car years ago. A 40-100 mph roll at around 575 rwhp on an 80 degree day is Nirvana.