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I'm saying that with our gearing, you could not use 600rwhp in a cruise. The air resistance would not be enough to eat up all 600 rwhp unless you were going more than 200 mph, and our gearing wouldn't allow that to happen. Therefore you'd never really know how long the car could last at 600rwhp since that power is limited to short bursts. I personally don't think our cars are made to put out sustained power like that. That's why drag racing is more accessible to people. You don't need all that fancy upgraded cooling system, oil cooler, diff cooler, etc to put a lot of power in a short 8-14 second burst. For endurance racing you need to make sure that your parts' ability to dissipate heat is greater than their ability to produce heat. For drag racing that never really becomes a factor. Also, I'd have to disagree about turbos not being long term power adders. Tractor trailers use turbos to produce much of their power, and those things scream the entire time, sometimes producing as much as 60 psi. When they're on the highway cruising, those turbos are howling along. They do long term hauls, often racking up millions of miles in their lifetime
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