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Originally Posted by serialk11r
I'm skeptical about cooling causing so much drag. Twice the power does not mean twice the cooling drag necessarily. A bigger radiator would give you a lot more cooling capacity for the same air flow. You would think that with a bigger engine and a bigger turbo that they would add a bigger radiator as well.
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These modern cars don't have that much free space anywhere. At the front end there are already multiple radiators. And it's not only the engine cooling. 45 AMG engine uses very high boost pressure, which needs big radiators for water cooling. A high power four wheel drive automatic gearbox most likely needs healthy size radiator, but low power manual transmission doesn't need any extra cooling. We also have brakes, which have totally different specs in speed oriented AMG model compared to eco racers.
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I still say, the 0.22 is BS, they probably measured it without a "treadmill" which reduces drag from the wheels and underbody.
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Mercedes Benz CLA 2013 Wind Tunnel Aerodynamic Test Part 2 - YouTube