We Take Audi's Tamed TT for a Spin - First Drive Review - Auto Reviews - Car and Driver
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More obviously, all TTs get a small rear spoiler mounted to the decklid in a move aimed at reducing lift on the rear axle at high speeds. The TT has 148 pounds of lift at the rear axle at 125 mph without the spoiler, but only a 53-pound lift when the spoiler is fitted. By comparison, the BMW Z3 coupe generates 64 pounds of lift at 125 mph; the Mercedes-Benz SLK, 104 pounds of lift; and the Porsche Boxster, 68 pounds of lift. The chassis engineers claim they could have solved the problem without the spoiler, but this would have meant a significant increase in understeer at normal speeds, a trait they wanted to avoid. All TTs also get a version of VW's switchable Electronic Stability Program (ESP).
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So it turns out a car for which lift actually was a problem at high speeds was only experiencing 148lbs before they added the spoiler. I'm surprised that's even though to make a big difference in handling though.
So what kind of lift would you get a 65mph? About 1/4 as much as 125mph?