2005 Mazda 3 2.3l on 2040-cars

Auto blog

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.

Flyin' Miata's 525-hp V8-powered ND finally hits the streets

Flyin' Miata, in its valiant quest to turn Mazda's roadsters into small, Japanese Corvettes, has finally finished its first V8-powered ND Miata. The company has been slowly teasing us with images and videos for months, but it wasn't until this week that the car finally made it to the streets. As soon as the current ND generation Miata was released, Flyin' Miata started the work to shoehorn a GM LS3 under the hood. The company has a history of building brutish, V8-powered Miatas. It sells everything from minor parts to full V8 conversion kits. For those with the cash that prefer to avoid the hassle, Flyin' Miata will sell you a complete, turn-key car. The price hasn't been finalized, but customers should expect to pay about $50,000 plus the cost of the MX-5. The new car has a worked-over LS3 that sends 525 horsepower to the rear wheels through a Tremec T56 transmission. Flyin' Miata says the rear differential comes from a V8 Camaro. Other new bits include exhaust, suspension, brakes, and a roll cage. Flyin' Miata tells us that the V8-swapped ND will weigh 2,592 lbs, a little more than 200 lbs more than the porkiest stock Miata. Despite twice as many cylinders and more than three times the displacement of the stock four banger, the LS3 V8 is a relatively small and lightweight engine. The finished car has a 53:47 front to rear weight distribution. Final touches are being finished, but cars and kits should be available soon. This article has been updated with some info straight from Flyin' Miata. Thanks, Keith! Related Video: News Source: Road & Track, Flyin' Miata Mazda Convertible Performance flyin miata

WAVE 2015: Metron 7 sets new record of 513 miles on one charge

Sometimes you just gotta push harder, faster, longer. Last fall, the Metron Institute team from Slovenia took their converted all-electric Mazda5 minivan on an impressive 457-mile journey from Bled (in Sloveniva) to Dubrovnik (in Croatia) without stopping to recharge at an average speed of 40 miles an hour. Today, as part of the WAVE Trophy 2015, the Metron 7 EV just finished up a drive of 826.1 kilometers (513.3 miles) on a single charge. The drive started in Berlin and ended in Karlsruhe, Germany. As you might suspect, a drive of this length on normal roads required a big battery pack. The total pack capacity was 108 kWh, thanks to the combination of the built-in 86-kWh pack that uses lithium polymer cells from Kokam and a 130-pound, 22-kWh external pack that Metron has developed that can charge the built-in pack while driving. The average speed of the 500-mile journey was 45 miles per hour (72 kilometers per hour) through rural countryside, towns, and some time on the highway. The drivers –Andrej and Jasna Pecjak – did not use air conditioning, but the fans were running. The weather was temperate enough that AC wasn't needed anyway these last two days. The Metron 7 was a part of the last two WAVE events and has been updated since the last record was set in October 2014. On the new record journey, the minivan was loaded up with gear, but the Metron engineers made improvements to the car in the last eight months: the side mirrors are smaller and they fitted a better aerodynamic cover underneath the vehicle, for example. Andrej said that the cost for the batteries was around $50,000, since some of the cells he got were used. Today's record is unofficial, but AutoblogGreen witnessed both the sealing of the charge port in Berlin and was in the car for the last 125 kilometers today. Featured Gallery WAVE 2015: Metron 7 EV Distance Record Green Mazda AutoblogGreen Exclusive Fuel Efficiency Green Culture Electric mazda mazda5 mazda5