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Mazda6 Skyactiv-D Racecar ready to bring diesel to Grand-Am

It may not be quite as radical as some of the company's past rotary racers, but the new Mazda6 Skyactiv-D racecar does have a notable powertrain underhood: the automaker's brand-new clean diesel four-cylinder engine.
Three of these new diesel-powered Mazda6 racers will take to the track in the Grand-Am GX class of the upcoming 2013 Rolex 24 at Daytona on January 26, with five drivers on each team. The car you see above, number 70, is sponsored by Mazda's longtime motorsports partner, SpeedSource.
Check out our full gallery of high-res images live from the 2013 Detroit Auto Show above and feel free to read through the related press release from Mazda below.

2019 Mazda CX-5 Signature Diesel First Drive Review | A tardy inessential

We were suspicious of the much-delayed Mazda CX-5 Diesel when it finally arrived at our office late this summer. Had it surfaced four or even two years ago, we might’ve been more bullish, but at least we werenÂ’t cynical — yet. Even the Volkswagen Dieselgate crisis couldnÂ’t turn our hearts against the CX-5 Diesel. We already like the CX-5, after all, we also like the eager torque, quiet ride and excellent fuel economy the Skyactiv-D engine would surely provide. But then we got the EPA ratings for the the CX-5Â’s diesel engine: 27 mpg city and 30 highway. Granted, thatÂ’s in an all-wheel-drive vehicle, but itÂ’s a serious disappointment. The turbocharged, gasoline-powered 2.5-liter I4 in the CX-5 Signature gets 24 combined mpg, while offering up to 250 horsepower and 310 pound-feet of torque. The diesel version is down 82 hp (at 168) and 20 lb-ft (at 290), while elevating fuel economy to 27 city, 30 highway and 28 combined. The non-turbo gas motor in lesser AWD trims narrows the gap to just 2 combined mpg in favor of the diesel. So whatÂ’s the selling point for the Skyactiv-D? Mazda says itÂ’s a premium experience, and thatÂ’s why itÂ’s only available in the top trim level. ItÂ’s easy to flinch at that, but it makes some sense, when you look at other diesels in the U.S. market The Signature trim of the CX-5, as with the Mazda6 weÂ’ve come to adore, is good enough to target the lower end of, say, Audi customers who are looking to get a bit more content for the buck. These might also be the same people whoÂ’ve come out of a TDI vehicle and are already sold on the diesel experience. From the first squeeze of our right foot, the diesel CX-5 makes a good impression. In town, we diced our way through Woodward Avenue traffic, made easy mostly by the CX-5Â’s relative small size and agility. There is one point in the throttle tip-in when the engine sounds particularly growly, and somehow more massive than its 2.2 liters of displacement. The illusion began to crumble when we reached our first highway entrance ramp. Putting our foot to the floor, we got the quick first hit of growly torque, followed by Â… well not much. This engine begins to run out of steam as it climbs the rev ladder. ThatÂ’s not totally unexpected, but it was definitely disappointing. Furthermore, as Assistant Editor Zac Palmer points out, “By opting for the diesel, you add 115 pounds to the curb weight (now 3,940 pounds) of a comparable 2.5-liter turbo (3,825 pounds).

Mazda details diesel prototype at Daytona test

Diesel has without a doubt become the dominant fuel in the modern era of endurance racing. The 24 Hours of Le Mans has been won under diesel power for the past eight years running, as has every race in the FIA World Endurance Championship since its inauguration in 2012. Yet there will only be one diesel prototype entered in the top tier of the new Tudor United SportsCar Championship this year, and it belongs to Mazda.
The last Japanese manufacturer to win at Le Mans outright, Mazda has been gradually working its way back up the endurance racing ladder once again, following the example set by Audi with diesel power. Last year it campaigned a competition-spec Mazda6 Skyactiv-D in the GX class of the Grand-Am series, but rather than simply port over the existing racer into the new series, it's fielding a new prototype instead, just as it promised a couple of months ago. And now that prototype has hit the track for the first time, prompting Mazda to release its basic specs for the first time.
Tentatively referred to simply as the 2014 Mazda Prototype, the purpose-built racecar is testing this weekend in the Roar Before the 24, the official test session at Daytona that kicks off the racing season. It packs a 2.2-liter SkyActiv-D engine that's based heavily on the production version but tuned to produce 450 horsepower and 580 pound-feet of torque in race trim. Power is channeled through a six-speed sequential transmission from Xtrac, carbon brakes from AP and 18-inch racing slicks from Continental. With the Daytona-spec aero setup, it'll top out at around 186 miles per hour.