The 40% scale wind tunnel mode, here in the car's final form.
02S
testing in the Shrivenham wind tunnel. Initial wind tunnel
testing began in early March of 2001, finishing in December, and
concluding approximately 45 days of wind tunnel development.The 02S wind tunnel model borrowed heavily from the 2KQ/01Q model program, as can be seen from this image of the 02S wind tunnel model in a very early iteration (the 5th tunnel test here, late May, early June 2001). At this point the rear bodywork, tail, and rear wing are clear 2KQ/01Q carry overs. Here a Lola B01/60-esque rear "Coke bottle" duct, ahead of the rear wheel, is being tested.
By test 5, L/D was hovering around 3.8 to 4.0:1.
Here
we see the 02S in a much-closer-to-final form. By the 02's final
form, L/D would approach, and exceed (at certain configurations and
ride heights), 5:1. 
In near final form, downforce
was in the region of 5600 lbs, for 1155 lbs of drag and 42%
balance at 200 mph, in a high downforce configuration. Low drag setup would
see drag drop considerable, to around 810 lbs, for 3680 lbs of
downforce.