I will probably go with a Reverie wing but have 4 options at this point :
Chord > 150 ; Span > 1250 ; Downforce @ 160kmh and AOA of 10deg > 380N ; BHP absorbed > 2.9
Chord > 150 ; Span > 1400 ; Downforce @ 160kmh and AOA of 10deg > 427N ; BHP absorbed > 3.2
Chord > 225 ; Span > 1250 ; Downforce @ 160kmh and AOA of 8deg > 574N ; BHP absorbed > 5.1
Chord > 225 ; Span > 1400 ; Downforce @ 160kmh and AOA of 8deg > 617N ; BHP absorbed > 6.3
1) To convert to kg we need to divide by 10, so for ex. 380N = 38kg
2) Those figures are in a freestream of air wich means on our car they will be smaller. Also the extremes of the wing wich hang out of the car's limits are the most efficient so in reality, the difference between 1250 and 1400 might be larger. The car has about 1050 at the upper side of the trunk lid, wich means a 1250mm wing will stick out 100mm on each side, while a 1400mm will stick out 175mm on each side !
The wings will be straight and will have endplates of course ! From what I could approximate on Supercopas and other similar racing hatchacks their wings seem closer to 150mm but they also have diffusers to help them with downfoce. From the Golf 5 GTI aerodynamic data presented earlier, the rear had a lift of 37kg @ 200kmh wich will probably be like 25kg @ 160kmh.
How would you guys judge this problem and what would you choose ?