2002 Mazda Protege5 Base Hatchback 4-door 2.0l on 2040-cars

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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:

Mazda hard at work on Skyactiv 2 engine technology

As Mazda continues the current rollout of its still-new Skyactiv technology, the automaker is already looking at improving its family of engines for even better fuel economy and emissions reductions. Automotive News reports that with stricter fuel economy and emissions regulations planned for 2020 and 2025 in Europe, Mazda will likely release engines with next-generation Skyactiv 2 technology by the end of this decade, and Skyactiv 3 units just five years later.
The latter is expected to focus on improved engine cooling and lessening energy losses, but the big news in AN's report is that the next-gen Skyactiv 2 engines will use Homogeneous Charge Compression Ignition, or HCCI. This type of ignition is very similar to how a diesel engine operates (with high compression and using the compression stroke for fuel combustion rather than spark plugs), a method said to provide a cleaner and more efficient fuel burn - to the tune of a 30-percent improvement in fuel economy compared to current Skyactiv engines. Other automakers, including Hyundai, have already announced they are developing HCCI powerplants with similar technology and characteristics, so Mazda likely won't be a lone wolf here.
Equipped with HCCI technology, Mazda figures to be able to compete with larger automakers in terms of fuel economy and emissions without resorting to hybrid powertrains, continuously variable transmissions or automatics relying on more forward gears (eight or more) for optimal efficiency. Some of the challenges of HCCI, according to AN, include the need for better engine cooling, risk of misfire at high and low rpm and uneven engine performance based on fuel properties.

2019 Mazda MX-5 Miata Drivers' Notes Review | A little power goes to our heads

The Mazda MX-5 Miata is nearly 30 years old. The current car — dubbed the ND — is in its fourth iteration and packs a number of updates for 2019, most notably a bump of 26 horsepower and 3 pound-feet over the 2018 model. The car now makes 181 horsepower at 7,000 rpm while redline has been raised to 7,500. That might not sound like a lot, but when you're moving fewer than 2,400 pounds of steel, aluminum and plastic, it feels plenty strong. Our test car was a Soul Red roadster with a brown top, an odd but striking combination. A power-retractable top is available as the Miata RF. This top-tier Grand Touring trim comes with features like automatic climate control, heated seats and leather seats. It might not be the most practical or versatile car on the road, but it might just be the most fun for the money. Senior Editor, Green, John Beltz Snyder: I was excited when I woke up to the Miata covered in snow in my driveway. After all, this tester came equipped with Bridgestone Blizzak winter tires. By the time I could pry myself away from my work and take the car for a spin, though, the snow had mostly melted. I still had fun flinging this around on the cold, wet roads. The first thing I noticed was actually what I didn't notice ... I wasn't wishing for just a little more power, for once. Chalk it up to the conditions, or to the extra 26 horsepower Mazda added for 2019, but this felt appropriately potent. If anything, it's just enough to help get the rear end to wiggle a bit and the tires to more readily chirp in second gear. The Miata, fresh from the factory, has learned to do the cha-cha. Oddly enough, though, my wife, who has been salivating over this generation of MX-5 since the first time I brought one home, has cooled on it a little bit. We went out on a date night, and she was hyper aware of the noise and bumps, and I was, too, frankly. Something about bundling up under an icy soft top can kill the mood of this convertible. In the summer, the sound of the engine and telegraphic feel of the road beneath you blend with the warmth of the sun and the tug of the wind in automotive harmony. It's still fun to drive in the cold, but it doesn't quite turn on the charm like it normally does. Associate Editor Reese Counts: I've spent a lot of time behind the wheel of various NDs over the past few years. The weekend I got married, my wife and I drove a Soul Red roadster from Los Angeles to San Francisco for a brief honeymoon.