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Chrysler did extensive research into spoiler usage for all phases of motorsports from drag racing to super speedways to trans am. Net result was that spoilers begin producing results at speeds as low as 65 mph. They also increase drag as a by product of force generation, so it becomes a trade off off on what the final goal is.

I'm sure someone can produce some of the technical papers written by mopar engineers over the years. I've seen them and know they are out there on the web. They are good reading because they specifically address some of the smaller spoilers used within SCCA rule limitations and the resulting research that is also applicable to more street oriented applications

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