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Honda, Mazda, Mitsubishi, Mercedes also under diesel emissions scrutiny

The controversy over Volkswagen's diesel emissions scandal isn't limited to the US. In Europe, where diesel engines are far more popular, the issue is shining a harsh light on the NEDC emissions test. As already known, the evaluation does a poor job of reflecting real-world production of NOx, and it appears a significant number of automakers are affected. The Guardian in the UK has been reporting on real-world test results from a company called Emissions Analytics. After the latest round of checks, vehicles from Mercedes-Benz, Honda, Mazda and Mitsubishi were found to generate far more NOx than they should. The newspaper also published similar results for Renault, Nissan, Hyundai, Fiat, Volvo, Jeep, Citroen, VW, and Audi. On average, the figures are about four times over the limit of producing the pollutant. Unlike VW and its defeat device, these automakers aren't actually breaking the rules. The vehicles perform up to the NEDC lab test for emissions, but those results simply aren't translated to the street. "The VW issue in the US was purely the trigger which threw light on a slightly different problem in the EU - widespread legal over-emissions," Nick Molden from Emissions Analytics said to The Guardian. A big fight to decide the future of this issue appears to be on the horizon. Automakers claim that they can't meet the next round of tightening emissions regulations and are asking for compromises. Although, spokespeople for Mercedes and Honda told The Guardian that the brands would be in favor of the stricter rules. Meanwhile, some European governments began backtracking their support of diesels well before this scandal came to light. The added scrutiny certain hasn't helped the future of the oil-burner. Related Video:

Sorry, rotary fans, Mazda's RX Vision probably won't happen

Mazda is doing a lot of things the right way in this age of beige-ness. It just crammed a turbocharged inline-four into the improved CX-9, a bold move unto itself, and one that should also be heartening for Mazdaspeed fans. Wouldn't that engine make for a swell Mazdaspeed3 or Mazdaspeed6? There's a reasonable ray of hope there, but not necessarily a guarantee. The RX Vision, though, is a pipe dream. Mazda is smart to keep the rotary dream alive. It's smart to keep developing it in back rooms and to keep the idea on the public's mind. Credit where credit's due: Mazda has solved some of the stickiest issues the rotary engine has, through savvy engineering and perseverance. We've seen promising patent filings for the Skyactiv-R engine, which is supposed to be found in the RX Vision concept. Mazda uses every opportunity to remind us that development is continuing and that the company would love to bring a rotary-powered sportscar to production. I believe it. But the RX Vision is just a design study. And there are some harsh realities about rotary engine emissions and fuel economy standards that are difficult for modern piston engines to achieve without expensive componentry. Emissions and fuel economy are both bugbears of the rotary, in case you've forgotten. And that explains Mazda's interest in running rotaries on hydrogen, but down that road lie infrastructure challenges as daunting as making a gasoline-powered rotary burn as clean as one of Mazda's Skyactiv piston engines. All this is meant to put Mazda's recent comments to Top Gear in context. Mazda's design director, Kevin Rice, spoke to TG at the Concorso d'Eleganza Villa D'Este, and was waving Mazda's rotary flag quite enthusiastically. "In the back rooms at Mazda, we're still developing it," Rice said, "and when the world's ready to buy another rotary, we'll be ready to provide it." I'd like that to be a comforting statement, but given the realities of fuel economy and emissions regulations and Mazda's position in the market, it seems like a hollow platitude. "When the world's ready" is just another way of saying "when we solve the fundamental issues with this engine layout, and there's an unambiguous market study that shows we can build these cars and make a profit, we'll consider it." That seems like a lot of "ifs". Perhaps Mazda does have a clean-burning, efficient, cheap-to-produce rotary running on an engine dyno in Hiroshima, and it's prepping an RX-9 for the next auto show.

Here's what you had to say about the Tokyo Motor Show

We obsessively covered the 2017 Tokyo Motor Show. You, our readers, provided the color commentary. Read on and, of course, leave your comments below. Subaru Viziv Performance Concept: Remember the WRX concept they showed in 2013, and what the production version looked like in 2015? Pepperidge Farm remembers. wooootles 2 foot high wing on the trunk or gtfo :) sc0rch3d Mazda Kai Concept : Dear Honda, this is how you dynamically style a hatchback. Thank you. Dfelix70 Kudos to KODO design. There are so many things I love about this "Kai" car: the awesome split panoramic sunroof, the Jaguar-esque tails (sporting an "eyebrow up"... ala The Rock), a sleek family resemblance to the already beautiful CX-5 and CX-9. Seems suspiciously close to being a production ready Mazda3 — save for a few fanciful bits (door handles, mirrors etc). If it doesn't get too watered down by the time it hits the streets ... take my money! Randy Ross Mitsubishi e-Evolution Concept: As an 06 IX and 12 X owner, this is so upsetting. I will never buy this or care to give it another look. Hope you are glad you killed my favorite track-ready car to produce this electric junk. AcidTonic Picture the GT-R going away for a few years and coming back as an SUV. This is ridiculous. Surely someone in marketing could've came up with another cool name. Evo The Evo sedan is dead, whether this exists or not. I don't mind. Lada1200 Honda Sports EV Concept : I sure would like to see this "less is more" design aesthetic spread to their gas-powered production line. RustyShackleford Love it. I see glimpses of late 1970 Scirocco with Honda flair. Gintonics I just want ONE question answered in the affirmative, and that is... "RWD?" Henadenk AND A FEW FROM FACEBOOK: Toyota's press conference: Wake me up when they talk about the Supra. David Levinson Yamaha Cross Hub Concept: All I can think is modern day Brat, which has its own kind of charm. I'm assuming that it's a unibody design, but it seems happy to be its own thing rather than that crossover pretending to be a pickup called the Ridgeline. Would definitely take the Yamaha over the Honda, although I doubt it'll come to the states. Cole Henry Mazda Vision Coupe Concept: Face: KIA K7, Tail: Aston martin. Harold Shin A bit British, no? Jim Lykas Related Video: News Source: Honda, Toyota, YamahaImage Credit: Subaru, Mazda, Mitsubishi Auto News Green Tokyo Auto Salon Tokyo Motor Show Honda Mazda Mitsubishi Subaru Toyota 2017 tokyo motor show