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Japan plans real-world diesel emissions test after companies fail

Japan's transport ministry plans to start real-world diesel emissions tests after an experiment found four models from Toyota, Nissan, and Mitsubishi that produced more nitrogen oxide (NOx) emissions than the nation's rules allow, according to The Japan Times. Regulators there usually only perform emissions checks in the lab. The VW diesel scandal has everyone double-checking their figures. Diesel versions of the Toyota Hiace van, Land Cruiser Prado, and Nissan X-Trail produced up to 10 times more NOx than allowed. The Mitsubishi Delica D:5 was up to five times over the limit, The Wall Street Journal reports. There was no evidence of defeat devices in the vehicles. Mazda performed well in the experiment, though. The CX-5 passed with nearly the same results on the road and in the lab. The Demio, better known as the Mazda2, did nearly as well with only slighter higher figures in the real world than in the controlled setting. The experimenters theorized the reason for the excessive emissions was that cold weather caused the engines' software to shut off the exhaust gas recirculation to prevent damage, according to the WSJ. However, this behavior also increased NOx production. Toyota, Nissan, and Mitsubishi don't have to worry about punishment from the transport ministry because this check was just an experiment. Their models already passed the mandated lab tests, which was the only requirement, according to The Japan Times. As governments begin greater real-world emissions tests, the results suggests diesels aren't very clean. A recent check in France found models from Ford, Renault, and Mercedes-Benz that didn't perform up to the standards. Regulators in India conducted similar evaluations and ordered VW to recall over 300,000 vehicles. Related Video:

Fourth-gen Mazda MX-5 Miata could get turbo power later in life

While there's a lot to love about the new Mazda MX-5 Miata, its debut was met by a vocal group of enthusiasts who derided the fourth-generation roadster's reduction in power output. The new model only puts out 155 horsepower, down from 167 in the NC. A report from Australia, though, claims Mazda may yet address the less potent output of the ND. Things started earlier this year, as Motoring.com.au tells it, when Mazda's global PR boss, Kudo Hidetoshi, hinted that a turbocharged or Mazdaspeed model "will definitely" be considered. Then last month at Goodwood, the ND's program manager, Nobuhiro Yamamoto, said complainers were welcome to get their thrills elsewhere. Recognizing this contradiction among Mazda's brass, Motoring asked Yamamoto-san again about his statements, which he seemed to walk back. "It's not a conflict [between statements made by Yamamoto and Hidetoshi]," Yamamoto said, indicating that his statements were made in relation to the new MX-5's launch. "Kudo-san talked about this in terms of a 10-year lifespan, but when I was asked the question right after the launching of the ND, I said 'we have no plan to have a turbo at that point in time.' That is what I meant." Seeking an opening, Motoring pushed the Japanese engineer on the chances of a more potent MX-5, perhaps without a turbocharger. "If you could achieve what we want, to which is great response, very light and powerful with great performance feel with natural aspiration, then we don't need a turbo," Yamamoto said. "But if we want more power because we don't get satisfied with natural aspiration then we may think about the turbo." Related Video:

Junkyard Gem: 1989 Mazda MX-6 GT Turbo

The Mazda MX-6 is best-known in the United States as the sibling (or maybe first cousin) of the Ford Probe, which almost became the successor to the Fox Mustang. The MX-6 and Probe were well-engineered and very quick for the era, but never enjoyed great American-market sales success. Here's a rare first-generation MX-6 GT that I photographed last week in a Denver self-service yard. 145 turbocharged horsepower was pretty good for 1989, when a new Honda Prelude Si had 135 horses and the far more expensive BMW 325i ($24,650 for the 325i coupe versus $14,499 for the MX-6 GT Turbo) had 168. This one doesn't have the optional four-wheel steering, but it does have the three-way adjustable suspension. If you drove a turbocharged car in 1989, you needed a nine-band equalizer with analog sliders on the radio. It was the law. It's not rusty, but at 205,575 miles it's worn out. This content is hosted by a third party. To view it, please update your privacy preferences. Manage Settings. The Japanese-market version was known as the Capella C2, and it boasted some great TV commercials. This content is hosted by a third party. To view it, please update your privacy preferences. Manage Settings. "A better value in high-performance luxury sports coupes comes from our intense commitment to your total satisfaction." As always, the US-market TV ads are less interesting than their Japanese counterparts. Related Video: Featured Gallery Junked 1989 Mazda MX-6 GT Turbo View 21 Photos Image Credit: Murilee Martin / AOL Auto News Mazda Coupe Classics