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Originally Posted by epaulo
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thanks for that link. whp is all that matters...where the rubber meets the road. that gtr put down 431 whp, and 425 wtq.
the z06 put down 443 whp and 411 wtq on lg motorsports' dyno...i know it's a different dyno, different day.
http://www.z06vette.com/forums/f64/z...numbers-88326/ the torque management plus lack of traction kills the 0-60 time...but you only do 0-60 once in a race.
the zr1 should dyno above 540 whp. the gtr isn't even close! but i don't think it's the hp, or wide tires that makes the gtr move around the 'ring. they just have a torsionally stiff frame, and well sorted out suspension that uses the tires better than the corvette's suspension.
you also have to consider the gear ratios. dyno runs are made in 4th gear, or close to 1:1. the z06 has a 9.10:1 overall first gear while the gtr has a 15.02:1 first. that gives the gtr a 57% higher lever advantage than the z06. i.e. 15.02*431 whp = 6474 whp vs 9.10*443 whp = 4031 whp. so i don't think the gtr is way overrated, just geared well for good 0-60 times. the twin-clutch tranny also helps 0-60.
you can see the gear advantage in 0-60, but the z06 pulls away above that. 1/4 mile mph is an indicator of hp, while e.t. is closely related to traction. the z06 traps at 123.7 mph, while the gtr traps at 116.5 mph. the gtr is going about as fast as it can given its power, while the z06 should be trapping 11.0. some stock z06 have gone high 10 seconds with stickier tires.
tvs is still a positive displacement supercharger. screw s/c compress the air - that's why blowers will never be as fast, or as strong as a screw s/c - and make higher boost way more efficiently - around 90%. i'd go with kenne bell vs whipple ftw. kenne uses larger diameter rotors = more efficient, slower speed, less parasitic loss. he has 7 psi kits for the ls6 that will walk all over the zr1.
intake length tuning abosolutely DOES help s/c engines...just as header tuning helps turbos. just because they can make the intake that way doesn't mean it's optimal. i guarantee gmpt had to use a psi or two more to get the cylinder filling at high rpm because they lost the ram effect from super short runners.