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Mazda zooms into SEMA 2016 with lighter MX-5 Speedster and RF Kuro concepts

It's almost time for the 2016 SEMA aftermarket show again, if you haven't guessed already by the steady parade of early looks at various show cars. Mazda's MX-5 creations are generally a highlight for us, unapologetic Miata junkies that we are. This year's cars should be just as exciting as last year's, one being a revision of last year's Speedster concept and the other based on the brand new, sexy RF retractable targa top model. Both SEMA MX-5s were designed and built in-house at Mazda's Irvine design studio. This year's Speedster is somehow even lighter than before. Mazda carved 100 pounds out of it, making it a staggering 350 pounds less than a production soft top model. It's also been repainted in a color called "White Ether", which we're imagining looks something like the "Blue Ether" paintjob on last year's highly reflective Speedster minus the blue tint. Mazda will probably never sell a roofless Miata or anything this lightweight, but maybe it should. It looks like it'd be a blast to drive at a road course. And then there's the RF Kuro concept, the first RF-based SEMA show car, which is shown in the teaser above. It doesn't seem terribly extreme, to be honest. It's wearing a matte charcoal paint, which explains the "Kuro" moniker – kuro means "charcoal" in Japanese. A set of 17-inch RAYS forged wheels and MX-5 Cup suspension, and that's about it. Not to knock it; the RF is a sexy looking thing as it sits, and Cup suspension should make it handle even more like a go-kart. Of course, both concepts will be fully revealed at the show next month in Las Vegas. Stay tuned for a dose of concept Miata hotness.Related Video:

Mazda boss says no to new-generation Mazda3 hot hatch

Mazda offered a hot, turbocharged version of the Mazda3 model during the car's first two generations, badging it either the MPS or the Mazdaspeed 3 depending on the market. The third generation car didn't get a hot-hatch variant, and now Mazda is saying there won't be one for the freshly revealed fourth-gen car, either. Mazda's new global boss, Akira Marumoto, told Australian motor journalists at the Los Angeles show that there won't be an MPS in the cards. As Drive quotes Marumoto: "Mazda is a small player, and if [you are asking whether] that segment has a high particular priority for Mazda, my answer would be no. Therefore we not planning for MPS in the future." Marumoto stated that Mazda would rather establish itself as a genuine premium carmaker comparable to its European rivals, stressing that this would be achievable through quality, comfort and refinement improvements in the existing lineup rather than expanding into other segments. As well as nixing the Mazda3 MPS, Marumoto also said that despite repeated queries, the function of the 2015 Tokyo Motor Show car RX Vision was to preview the evolution of the Kodo design language and not to herald the arrival of a new rotary sportscar. So, it's time to cue the Mazda Kills Rotary Sports Car Again headlines. Marumoto also told journalists that there won't be an EV sports car or a completely driverless car from Mazda either: He said he prefers the smell of gasoline to full electric power, and that Mazda will never build a car without a steering wheel. For Mazda, autonomous capabilities would serve to bring the car to a safe halt in the case of an incapacitated driver, instead of doing the driving. However — and there is a strong "however" — Mazda did tell us that the turbocharged 2.5-liter engine does fit into the new 3. Mazda representatives said that the header on the naturally aspirated version is big enough as it is, making it easy to shoehorn in the 250-horsepower turbo version without issue. They also said that the company is closely monitoring buyer demand, which originally led to the turbo being available on the Mazda6 and CX-5, along with justifying the introduction of all-wheel-drive in the new Mazda3. So: if there is a case for it, the turbo might come — just don't call it a Mazdaspeed 3, or view it as an overt hot hatch. But the shoe fits.

Mazda Skyactiv-X Review | The revolution begins with a squeeze-bang

The matte black Skyactiv-X prototype looks like a rough Mazda3, perhaps reconstructed after a bad wreck by an over-enthusiastic owner of a spot welder and lots of gaffers' tape. Ribbed ducts poke out of the dash sending two breaths of conditioned air to no one in particular. Even its revolutionary engine, the thing we're here to experience, is entombed in a massive, nondescript cover to mask its unseemly noises. It's a wild, strange way to meet a very unconventional vehicle that promises diesel-like fuel economy, a wide torque band, and an exotic method for burning less gas than ever before. It takes a few hours for Mazda's engineers to explain the fundamental principles of operation. For more detail, read our Skyactiv-X Spark Controlled Compression Ignition explainer, but here's a very brief overview. Skyactiv-X marries some traditional gasoline engine characteristics with a novel form of compression ignition called SPCCI. The key for Skyactiv-X is to use very high compression in the cylinder and an extremely lean fuel-air mixture. Squeezed right to the cusp of getting hot enough to blow up all on its own (which is very hard to predict), a squirt of extra gas and a spark interject to cross that compression-ignition threshold in a controlled and predictable manner. See the animation below: That takes a few essential components to get just right. One is a massive amount of computer processing power and some pressure sensors in the individual cylinders, because the ambient conditions change how and when these things happen. Skyactiv-X uses a clutched supercharger to pump in additional air when needed to nail the mixture precisely, and high-pressure injectors to get the low ratios of fuel to disperse properly in the chamber. And since it operates like a conventional gasoline engine sometimes, it uses valve timing to lower the very high compression ratio so it doesn't reach combustion ignition in that mode. In practice, the Skyactiv-X runs in compression ignition mode most of the time. In practical terms, that means it drives like a torquey gasoline Skyactiv engine. The torque curve is broad and flat — diesel-like in that respect. That also means it can get away with using a six-speed transmission and a lower final drive for better response. There's enough grunt and economy together that Mazda can let the engine spin faster — at 60 mph, it's running at roughly 1,000 more RPM than a similar gas engine, with greater efficiency.