The spinning air coming off the rear wheels interferes with the adjacent air fence/ diffuser/strake no matter the angle of incline.
The turbulence coming off those wheel wells can be seen in may CFD images and well as some smoke ones, including the ones on the second page of the article.
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George
Architect, Artist and Designer of Objects
2012 Infiniti G37X Coupe
1977 Porsche 911s Targa
1998 Chevy S-10 Pick-Up truck
1989 Scat II HP Hovercraft
You cannot sell aerodynamics in a can............
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