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This is how ground effects work in a nutshell

There are two ways to generate downforce. One is with all manner of wings and spoilers on the surface of the vehicle. The other is with ground effects. One you can clearly see, the other remains something of a hidden mystery. Fortunately, the good folks at Lotus and Goodwood are here to dumb it down for us non-engineer types. It's called Bernoulli's Principle, named after Swiss physicist Daniel Bernoulli who literally wrote the book on the subject way back in the 1700s. Countless engineers have spent their careers focused on its study and application, but the crux of the matter is that, as the speed of air (or other "fluid") increases, pressure decreases. Play with the air's increasing speed and decreasing pressure just right and you can generate downforce underneath the body of a car without significantly increasing drag as you would with surface spoilers. For evidence of how Bernoulli's Principle applies in practical terms, just look at the last Ferrari to pack a turbocharged V8 in the middle and the latest one. The F40 had a giant wing on the back, where the 488 GTB has none. But because the 488 uses underbody aerodynamics (or "ground effects"), it generates significantly more downforce than the winged F40 ever could, and at lower speeds. Ferrari, however, was not the first outfit to harness the power of ground effects. Lotus did with the legendary 79 that Mario Andretti drove to the world championship back in 1978. That was the genius of Colin Chapman, and to explain how it all works in layman's terms, our friends over at Goodwood Road & Racing brought in Colin's son Clive Chapman, head of Classic Team Lotus, to put together the video above. Related Video:

Lotus Exige V6 Cup takes extreme to the extreme

What separates a road car from a race car? You're looking at it. It's the Lotus Exige V6 Cup, a model based on what is already one of the most hardcore performance machines on the road, albeit upgraded to an even harder-core spec. It's a good 130 pounds lighter than the Exige S (a vehicle which didn't have much flab to trim in the first place) and can hit 60 in under four seconds. With the notably exception of certain versions of the Porsche 911, there aren't a lot of six-cylinder cars that can claim that kind of performance.
In fact, the Exige V6 Cup is so close to race spec that it's already eligible for a number of racing series. Just bolt in the removable FIA-certified roll cage, maybe swap on some slick tires and you're good to go. Then you can drive it home again when you're done, just like in sports car racing's heyday. But don't take our word for it: the team over at XCar took the V6 Cup to the UK's Goodwood circuit to see how it compared to the Exige S it recently drove, and you can view the stirring results in the video below.

Aston Martin and Lotus each issue recalls

A pair of head-turning high performance cars are catching some attention off a different kind, in the form of safety recalls. Aston Martin and Lotus have issued recalls for the V12 Vantage Coupe and Evora, respectively.
Aston Martin's affects 169 examples of the 2009-2012 V12 Vantage Coupe. It concerns the tire-pressure monitoring system, and is less a malfunction than it is a compliance issue. The TPMS does not alert the driver until the front tire is more than 25 percent below the recommended cold tire pressure. Federal Motor Vehicle Safety Standard No. 138 states that the alarm must sound when tire pressure is "equal to or less than either the pressure 25 percent below" the recommended cold inflation pressure. To address the issue, Aston Martin will notify owners and reprogram the software, free of charge.
As for Lotus, 80 supercharged Evoras have been recalled, all built between February and September, 2011. The problem involves an engine-mounted oil feed pipe, which could rupture, causing loss of engine oil or a possible fire if the oil sprays onto a hot engine.