Mazda Rx-7 Turbo Coupe 2-door 1.3l on 2040-cars

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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:

Mazda engineer wants new rotary to be turbocharged

Hope springs eternal for Mazda to revive the high-revving Wankel engine for a new sports car, and the company keeps feeding that thirst with hints that it could happen. To make the possibility even more tantalizing, Mazda drivetrain and powertrain assistant manager Tetsushi Marutani tells Motoring that he wants the updated mill to pack a turbocharger. "Personally, I think that a rotary with some turbo or compressor would be good," Marutani said to Motoring. "Because a rotary, in my opinion, they require more [torque at] low speed, low down torque. So if we have some small compressor or turbo it would help." Mazda hasn't sold a rotary-powered model since the RX-8 and hasn't had a turbocharged one since the third-generation RX-7. However, the recent RX-Vision concept (above) at least hinted at a possible Wankel revival, and Mazda officials confirmed that its engineers continued to develop the engine since the RX-8's demise. The RX-Vision used a next-gen rotary called the Skyactiv-R, but Mazda didn't officially confirm any details about it. Rumors suggested the engine had a two-rotor layout with a total displacement of 1.6 liters. A two-stage electric turbo and hybrid powertrain would allegedly boost the total output of around 450 horsepower. The electric assistance could also counter the Wankel's lack of torque at low revs and poor fuel economy. Those rumored specs sound fantastic, but we still take the rotary's return with a grain of salt. Mazda CEO Masamichi Kogai is adamant that it's not worth the company's limited resources to develop a niche sports coupe instead of better selling vehicles. Related Video:

6 best cars for $5,000

Looking for a great used car but only have a few thousand bucks to spend? Check out our 6 favorite used vehicles that you can get for around $5,000 or less. 1. 2004-2006 Subaru WRX The Subaru Impreza WRX offers a lot of what you might want in a vehicle. A 2L turbocharged engine gives 227 horsepower and it gets 27 mpg on the highway. 2. 2006-2015 Mazda5 The Mazda5 never got the sales it deserved. It was affordable and more maneuverable than most vehicles, but it never took off. It was based on the Mazda3, and felt like it as well... just a bigger version. If you're lucky, you'll be able to locate one with a manual transmission. 3. 1990-1997 Mazda MX-5 Miata A car that's praised for rewarding the driver. The shifter is sublime, and the controls are light and accurate. The 1.6-liter engine that makes 115 horsepower or a 1.8-liter that makes 128 horsepower are our preferred versions. 4. 2009-2013 Honda Fit Beside being cute, it's supremely practical and great in the city. It manages to be pretty entertaining to drive, and let's not forget it's a hatchback. 5. 1987-2006 Jeep Wrangler Yes, it's possible to get a well-loved Jeep Wrangler with about 100,000 miles on the odometer. In many ways, a Wrangler is perfect for the snowy winters with its unrivaled 4x4 capability. An SUV, convertible and icon, all in one? What more could you ask for? 6. 2002 Chevy Silverado Truck lovers, we have you covered. We love the Chevy Silverado with a 5.3-liter V8 engine and a 4-speed automatic transmission. It makes a great second car, especially if you already have a fuel efficient vehicle around the house. What would you buy for $5,000? Honda Jeep Mazda Subaru Autoblog Minute Videos Original Video wrangler mazda5