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New info on how VW, Porsche, Audi V6 TDI engine cheat works

The German newspaper Bild am Sonntag is reporting that US investigators have found three pieces of software that work in concert to turn off the emissions control equipment in certain diesel models after a set period of time. The engine in question, the 3.0-liter TDI turbodiesel, was found in certain Volkswagen Touareg, Audi Q7, and Porsche Cayenne models – the sale of which was suspended in the US late last year. Since most emissions compliance testing takes around 20 minutes, the software in the three VW Group models shuts off the emissions control equipment after 22 minutes, a straightforward end run around the testing. Remember that the 3.0-liter TDI engines aren't included in the big buyback and recall program announced for the smaller 2.0-liter, four-cylinder TDI engines. The 3.0-liter engines will likely get their own program, but we don't know when to expect it or exactly what it will look like. Last month, California rejected a proposed fix for the larger TDI engines, and VW went back to the drawing board. Since the company is unlikely to create two fixes, one for California and one for the rest of the nation, the company can't really proceed until they figure out a solution California will accept. The EPA hasn't officially commented on the report, and we don't know how Bild am Sonntag came across the information, but we'll be closely watching what emerges after this report. Related Video:

Porsche confirms four-cylinder Boxster, Cayman replacement for US

Those who've been anxiously awaiting the return of the four-cylinder Porsche will be glad to know that the wait is almost over. What's more, the quad-pot Porsches won't be kept away from US showrooms but will form an integral part of the company's North American strategy. Confirmation comes courtesy of Automotive News, which spoke to the company's chief executive Matthias Muller about its return to four-cylinder power. "First of all, we will have it in the Boxster and Cayman successor," Muller told AN. "And then we will see how it works and how successful it is and how the customers will react on that, and then we will take the next decisions." The model to which Muller refers is expected to be the 718 – a new line taking the place of the Boxster and Cayman, ostensibly allowing Zuffenhausen to start from scratch rather than "downsizing" the engine on existing models. The new range is anticipated to launch sometime in the middle of next year. Porsche is currently offering a 2.0-liter inline-four with 234 horsepower in the Macan (which we get with V6s) for certain markets overseas, but the 718 is expected to get a new flat-four 2.0- and 2.5-liter displacements with output edging up to 395 horsepower. The last time Porsche offered a four-pot in the US was with the front-engined 968 that wrapped up production two decades ago, but it hasn't offered a boxer four since 1976.

Watch a Cayenne Turbo S, Range Rover SVR, and Cherokee SRT drag race

We live in a weird world where high-performance SUVs could win a 60-mile-per-hour sprint against sports cars from just a few years ago. Here, Top Gear sets up a three-way drag race against the Porsche Cayenne Turbo S, Land Rover Range Rover Sport SVR, and Jeep Grand Cherokee SRT, and the results show just how quickly these high-riding models can cross the quarter mile. The Cherokee SRT is the patriotic choice among the three, but it's down on power in this fight. Meanwhile, the Range Rover's menacing growl sounds the best, and the Cayenne Turbo S has the most horsepower. You'll have to watch the video to see which SUV will win this battle. Related Video: