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What a 181-horsepower 2019 Mazda MX-5 Miata means for us, and you

Last month, we reported on a VIN filing dug up by Road & Track that showed that the 2019 Mazda MX-5 Miata's 2.0-liter Skyactiv-G engine would get a power bump, from 155 to 181 net horsepower. As for how the 2019 Miata would make that extra power, we heard rumors it'd utilize a new cylinder head allowing higher revs, accounting for that extra power. Now we have what appears to be a leaked document from Mazda Canada showing exactly where that extra power comes from. According to the document posted at Miata.net (registration required to see the image), Mazda will alter camshaft lift and valve size on both the intake and exhaust side, fit freer-flowing exhaust, and smooth and enlarge the piping on the air intake side. There are also internal engine modifications: lighter pistons with lower crowns for better swirl in the combustion chamber, lighter connecting rods, and a crankshaft balanced for higher-RPM operation. All those extra revs mean extra vibration and noise, so Mazda will ditch the single-mass flywheel for a "low-inertia" dual-mass flywheel – which will attempt to find a nice balance between DMF damping action and SMF directness. Overall, it's a pretty serious engine revision with some driveline changes that will heavily affect the driving characteristics of a fantastic driver's car. Contributing Editor James Riswick and Senior Editor Alex Kierstein, both well versed in Miatas past and present, are here to analyze what this could mean for the little roadster. James Riswick: I don't know much about them lighter crank combustion rods, but I for one welcome the news of more power to the Miata. The jump from 155 to 181 seems like a very prudent Mazda-like thing to do, accomplishing that task through various aforementioned technical wizardry as opposed to slapping on a turbocharger, exclaiming "yee-hah" and calling it a day. Alex Kierstein: That's true. I'm wary of additional power, but you do make a good point that at least this is the right way to do it. Going all-motor will keep the bright responsiveness of the engine intact. But higher revs might make power delivery peakier. Frankly, I'd be ok with moving the torque and horsepower peaks up a bit in the rev range, making it a bit more work to access the engine's sweet spot. The dual-mass flywheel should also help if low-end torque suffers, so less stalling in traffic. JR: Did wonders in the 911 and 718s.

Japanese students turning Mazda CX-5 into Dakar Rally-ready off-roader

Students at Japan's Nihon Automobile College (NATS) are transforming a first-generation Mazda CX-5 into a full-blown off-roader that looks ready to compete in the Dakar Rally. Named CX-Runner, the one-of-a-kind model will make its debut at the Tokyo Auto Salon opening its doors in January 2020. The Tokyo Auto Salon is the Japanese equivalent of the annual SEMA show, so anything goes under the bright lights. NATS students began the CX-Runner project with a used 2012 CX-5 and seemingly set out to leave as few original parts as possible. While the project isn't finished yet, a sketch released by the school suggests the crossover will receive wheel arch extensions, an external roll cage, a beefier suspension, and a shorter front bumper that increases the approach angle.  Photos published on the school's official Facebook page show the project is moving along nicely. The body extensions are made with a composite material that looks like Kevlar, and fitting the rear wheel arches required sealing the back doors, which is fine; the CX-Runner will be a two-seater. We don't know if students are planning to make changes to the CX-5's powertrain yet, but a thick skid plate will protect whatever is under the hood from expensive impacts with obstacles encountered off-road. nats-mazda-cx-runner-project-1 View 3 Photos The Tokyo Auto Salon will open its doors on January 10, so the students have time to finish the custom-made body kit, install the suspension, paint the CX-Runner, and fit the roll cage. They're not just doing this for fun, though. NATS began offering a customizing class in 1998, and building a tuner car is one of the requirements aspiring builders need to fulfill in order to graduate. With that in mind, it's no surprise that NATS will again have a big presence during the 2020 edition of the Tokyo Auto Salon. In addition to the CX-5 off-roader, its students are building six custom cars including a Nissan 370Z roadster wearing front and rear fascias sourced from a GT-R, a Toyota 2000GT-inspired convertible based on the Suzuki Cappuccino kei car from the 1990s, and a four-door, five-seater Toyota 86 built on Camry bones but powered by the coupe's flat-four engine. Relate Video:

Turbocharged 2018 Mazda6 EPA mileage figures released

A few months after the reveal of the new turbocharged variant of the Mazda6, we now know how much more fuel the force-fed family sedan will require. The EPA rating puts it at 31 mpg on the highway, 23 in the city and 26 combined. That is less than the naturally aspirated model with either an automatic transmission or a manual, the former of which gets 35 mpg highway, 26 in town and 29 combined. But the naturally aspirated Mazda6's 184 horsepower and 185 pound-feet of torque are well short of the turbo engine's 250 horsepower and 310 pound-feet. The turbo Mazda6's fuel economy also puts it right in the range of similarly powerful sedans in the mid-size arena. In fact, almost every 2018 2.0-liter turbocharged sedan in the segment gets 26 mpg combined, including Kia Optima, Hyundai Sonata, Chevy Malibu, Buick Regal, and most versions of the Honda Accord, with only a difference of 1 or 2 mpg in city or highway results. The V6 Toyota Camry and Nissan Altima also hit this 26 mpg fuel economy mark. As far as power is concerned, the Mazda6 is also very even with the competition, most of which makes right around 250 horsepower, though the Toyota Camry's naturally aspirated V6 is a class-leader at 301 horsepower. But the 6's advantage is in torque. None of the mainstream family sedans touch the Mazda's whopping 310 pound-feet. The 2.0-liter Honda Accord and Ford Fusion come the closest at 273 and 275 pound-feet respectively. To beat the Mazda6 would require going for the Ford Fusion Sport, which is a unique step up in the segment with a turbocharged V6 making 380 pound-feet. The Fusion Sport takes a serious hit in the fuel economy department, though, getting just 20 mpg combined. Related Video: This content is hosted by a third party. To view it, please update your privacy preferences. Manage Settings.