In LMP12, if you run a chassis that is flat from front to rear, the car will understeer at speed. The holes cut in 12th chassis' between the front steering blocks give the car high-speed steering. No, I don't know why either!
The other thing to bear in mind is that with a gap between chassis and ground of less than 3mm, the air becomes turbulent and the car gets spooky. Sine the car decks out at this level of ground clearance, that is a greater problem for handling so the poor air flow isn't noticed.
Many moons ago Phil Greeno made a full ground effect 12th car that actually worked quite week. Jason Deardon did it with a Pro10 car and that was awful! My approach is to do what everyone else does. Mechanically I can past muster, but aerodynamically I ran out of talent real quick!
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