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Re: For the serious track junkies:
Downforce can definitely make a huge improvement in lap times. And it can seriously alter the front/rear bias as well.
At VIR a few years back I was crewing on an EVO 9 for an endurance race, during the qualifying the factory rear wing cracked dead center (apparently it doesn't like running at 148-152 mph for that long). We patched it numerous times, but it kept re-breaking and would sag on the high speed straights until the center touched the trunk lid, then return to mid-height at lowere speeds.
Eventually a team member 'procured' a 'used' street sign, and we used the aluminum to make a vertical center brace, and we were able to finish the rain-soaked 3 hour enduro with no issues. Every driver (there were 3 changes) commented that without the rear wing the car was scary to drive at higher speeds, very tail happy.
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