I found this in
Piechna's book. Sardou ([1]) tested underbody panel configurations on the same car in different wind tunnels, both and without a moving floor.
The chart below shows how adding different underbody panels influences aerodynamic drag and lift, but also lift for the front and rear axles.
Worth noting are two things:
- Adding panel #1 down the center increases drag,
- Adding the center panels (#'s 3, 2, and 1) decreases lift in the rear.
[1] Sardou M.,
The Sensitivity of Wind-Tunnel Data to a High-Speed Moving Ground for Different Types of Road Vehicles, SAE 880246, 1988.
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e·co·mod·ding: the art of turning vehicles into what they should be
What matters is
where you're going, not
how fast.
"... we humans tend to screw up everything that's good enough as it is...or everything that we're attracted to, we love to go and defile it." - Chris Cornell
[Old] Piwoslaw's Peugeot 307sw modding thread