 Note
the end fence on the horizontal plate. Also note the rather poor
placement of the rear wing flap mounts, in the low pressure zone underneath
the flap. |
 Pretty
standard rear diffuser. Here is how it looked at the Donnington round
before Le Mans. Full width, symmetrical strake location about centerline
(yellow highlights). The angle of attack of the diffuser seems steeper
than the Audi
R8. The rear diffuser has become real estate for advertising. |
 By
Le Mans the Dallara's diffuser was narrower. Note the inserts outboard
and compare the distance gap between the outer most strake and the inner
wall of the diffuser. The main issue here is the narrowed diffuser
is probably slightly more efficient as it has less interaction with the
turbulence of the spinning rear wheels. |
 Shown
here in Grand-Am specification at Fontana 2002. A tail wide gurney
has been added to compensate for the lack of diffuser (illegal in Grand-Am).
Also note the very large endplate, also to generate more rear grip. |
