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Originally Posted by chillsworld
I can't find an english version of that article, or a site that will translate correctly 
But I found this about the A45 AMG, so I find the generation of lift you claim a little bit suspect:
"The car only comes with three options - black wheels ($490), stiffer suspension ($1990) or the AMG aero package which adds front winglets, front wing and a fully sick rear wing which sets it further apart from the A250 Sport but also adds 40kg extra downforce at 250km/h"
( 2013 Mercedes Benz AMG A45 | Top Gear) |
For what you need translation? It's quite simple data. I'm sure, that google translator can translate few simple phrases.
Top Gear is just car related entertainment. Their extra downforce can easily mean lift reduction. In my opinion everything here is just as it should be. 400 N @ 250 km/h means about 200 N @ 200 km/h. So the lift at rear end would be about 350 N @ 200 km/h without the spoiler. That sounds totally believable. SportAuto measured 380 N lift for Renault Megane RS.
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Lets say the tires account for .025 and the KW increase accounts for .034, that's .059. What causes the other .049 increase in CD  Even if the two combined account for .06 of the .1 increase on the CLA, where does the other .04 come from? It must be aerodynamics of some type right?
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Just take a look at those pictures you posted. What do you see at the front end of CLA? There are huge holes for brake cooling and probably for charge air too.