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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:

Modded budget Mazda Miata takes on new Porsche Boxster in more challenges

Earlier this month, our friends across the pond at Auto Express released the first in a two-video series that would see them try and build up a second-generation Mazda MX-5 Miata that could best a standard Porsche Boxster around the track. While that first video detailed the mods to the MX-5 - a supercharger, some suspension upgrades and a new set of super-sticky rubber being chief among them - and set baseline lap times for the stock car, today, we have the results of the 5,000-pound ($8,200) upgrade job.
Of course, we aren't going to spoil those for you. You'll need to watch the full video, which recaps the upgrades before digging into a comparison of both straight-line-speed differences between the 2.7-liter Porsche Boxster and blown Miata, as well as their behavior and lap times on the track.
Take a look and let us know what you think in Comments.

Will the new Mazda Miata be available with multiple engines?

At this point, the countdown until the launch of the all-new, fourth-generation 2016 Mazda MX-5 Miata can be measured in hours until its September 3 unveiling as easily as it can in days. With the debut of such a highly anticipated model so close, the rumors about the new sports car are starting to boil over.
We recently heard that the new Miata would likely get a 2.0-liter Skyactiv four-cylinder with a six-speed manual, plus a decent drop in weight compared to the current gen. There's even the rumored possibility of a fastback coupe version sometime in the future.
Now, Australia's GoAuto is adding another dollop of speculation into the mix with the claim that there could be "potentially more engine options," according to Mazda Australia managing director Martin Benders to the website. The more potent option would still be the 2.0-liter Skyactiv with a power bump from its current 167 hp to closer to 200 ponies. The other possible powerplant option would be a 1.5-liter, naturally aspirated four-cylinder taken from the upcoming Mazda2 replacement. This version would also ditch some of the MX-5's more premium features to cut the weight and the price slightly.