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I think its important to note where you make the power, in the powerband.
I went with a decently aggressive cam (i was told) 243/247 .654 .657 112 lsa, and it makes most of the power above 4k RPM with peak hp at ~6k
I'm at 545WHP - NA, its fun but first gear is pretty useless, would need drag radials to actually "take off" in first - I think. (295 michelin super sport currently on rear)
I think a supercharger would be more enjoyable than cubes.
If you don't mind me asking, what was the cost to get your car to 545 whp NA? I've been told 15K+
For those with 600++ what kind of tires are you running and are they able to keep traction at the 600, 700, 800++ power level a WOT?
I'm making ~600/610 hp/tq to the wheels, and am running new Toyo Proxes R888R's. It hasn't been terribly warm in Albuquerque, but the tires hook very well. They'll nearly hold first from a stop, and undoubtedly hook even better once heated up. Love 'em!
I have run the R888's on my dedicated race car! Great tires with phenomenal traction but they wear out commiserate to the level of traction! I guess you have to pay of you want to play.