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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.

How Mazda got Skyactiv-X to work is incredible

"Take everything you know about engines and turn it around," Mazda North America Vehicle Development Engineer Dave Coleman says, patiently and with a look of benevolent pity, as he's quizzed about the particulars of the company's new engine. The Skyactiv-X engine is enigmatic — and deceptively simple in operation. And the bottom line for American consumers is that they'll be able to buy a car (or crossover; we don't know yet what vehicle will first get it) by late 2019 that provides diesel-like fuel economy but runs on regular old gasoline. In between diesel and spark ignition, but it's neither To truly understand it, you have to dive into the contradictions. Take that regular old gasoline: Contrary to common sense, the lower the octane, the better it works. In the lab, the Skyactiv-X engine loves 80 octane. The lowest Americans get is 87, so the engine is tuned for that octane. Go higher and you lose some low-end torque. Coleman was right. It's hard to wrap your head around an engine that thrives just at the point when most gas engines would aggressively self-destruct. It uses a supercharger to pump additional air — but not additional fuel. It uses spark plugs to start a combustion cycle that normally doesn't need a spark. And, quixotically, it's not displacing Mazda's own American-market diesel engine, currently languishing in a seemingly endless hell of regulatory approval. More bizarre: Mazda is a tiny automaker facing real existential headwinds, and gasoline compression ignition is a massive challenge. GM and Hyundai announced compression ignition, or HCCI, projects (full name, homogeneous charge compression ignition) to great fanfare, but they never amounted to a production hill of beans, crippled by reliability issues or horrible vibrations. Worse, they only worked at an unusably narrow range — low RPMs and low loads. HCCI research improved direct-injection gas and diesel engine technologies for these companies, but HCCI itself remains untamed. The benefits of lean combustion Why even try to tame HCCI? The answer is much better fuel economy and lower emissions. Less burned carbon-based fuel, less carbon dioxide released. That's simple. But there are some thermodynamic reasons for the lean combustion you can achieve with compression ignition that are worth explaining. The ideal amount of fuel for a conventional engine to burn is about a 14:1 air-to-fuel ratio. That lets every molecule burn nicely, in theory.

Meet our new long-term 2016 Mazda MX-5 Miata Club!

We have a new Miata! For a year! And yeah, we're excited about it. This adorable roadster was added to our fleet over a month ago, but we've just now stopped driving it long enough to tell you about it. You can watch our unboxing video for this new long-termer above. (Spoiler alert: The car in the box is a Miata.) Then read a little more about which options and features we chose and why. What we got We chose the mid-line Club model because it's the only way to get the suspension with Bilstein shocks, the limited-slip differential, and a shock-tower brace. Club also includes an appearance package with a front air dam, side sill extensions, a rear bumper skirt, and a ip spoiler for the trunk. We chose Ceramic Metallic paint because it's white and silver and awesome all at once. The only option we chose is the Brembo/BBS Package. In addition to the upgraded brake system and 17-inch wheels alluded to by the title, this package adds Mazda's advanced keyless entry – you can unlock the doors and start the car without taking the key-thing out of your pocket. The MSRP for the car is $32,835. What we skipped The Grand Touring trim (too fancy), the automatic transmission (too few pedals), and extra-cost red paint (not ceramic enough). Grand Touring adds lots of convenience stuff like rain-sensing wipers and auto climate, some active safety systems, and leather. We wanted the upgraded chassis instead, and we' were trying to save some (hypothetical) money. Why we got it Because it's a Miata, and we like fun. The plan is to drive the bleep out of it for a year and report on the experience along the way. We'll take it to a track or two, keep the top down as far into winter as possible, and then slap some snow tires on it to continue . Maybe at a slight angle relative to straight-ahead at times. We'll see. If you have questions about this car, leave them in the comments below and we'll address as many as we can during the coming months. Miata! Related Video: