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Originally Posted by chillsworld
Inferior? I don't believe that any model has "inferior" aero parts. They are just aero parts which have different goals. Aero parts designed for FE aren't inferior to those designed for downforce/venting. Just as those designed for down force/venting aren't inferior to ones designed for FE.
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Vents are there for cooling. More power needs more cooling. I really don't believe that downforce is that important in these machines. I don't have measurement data for CLA, but it's sister model A-Klasse was tested in SportAuto 3/2014. Even with optional AMG Aerodynamics package (AMG rear aerofoil, additional flics in front apron, larger front splitter) it didn't generate any downforce. It generated 430 N lift at the front end and 150 N lift at 200 km/h. Looks are there for sure but downforce is missing totally.
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Why would we not include the AMG? You listed it as an example, it should be included. If we don't include the AMG then we shouldn't include the BlueEFFICIENCY Edition since it has changes made specifically for aero like the AMG does.
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AMG model is the only model which has any change to be decigned downforce in mind.
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And I agree, it can be seen hand in hand in other cars... Just as ground effects, diffuser, exhaust, underbody, airdam differences can be seen in many of those cars. I understand the science and theories behind heat exchange and drag... I don't deny that it exists. But I'm a hands on kind of person, lets actually look at some differences in models.
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Ok. Let's take an example, which doesn't have any aero packages or anything to do with downforce. Here are Cd values for
Skoda Octavia:
1,6 l TDI/66 kW 0,286
1,6 l TDI/77 kW 0,288
2,0 l TDI/110 kW 0,297
1,2 l TSI/63 kW 0,294
1,2 l TSI/77 kW 0,290
1,4 l TSI/103 kW 0,301
1,8 l TSI/132 kW 0,304
If I understand correctly, all of these values are listed for standard base model with 195/65 R15 tires. If the tire size wuold increase, we would see a bigger change in Cd.