Wings are useful at higher speeds, but the variable ones don't come up until 100 k/hr-62 mph on the Chrysler Crossfire or even faster on the Porsche Boxster, as examples. I really wonder is there is a good reason to go beyond the size of the current
JCW wing on the GP. The MINIs that are racing don't seem to have big wing issues, some though are working on lower rear diffusers and front ducting for cooling and air intake charge.