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Infiniti's new VC-T changes the rules of small turbocharged engines

The upcoming Infiniti QX50 crossover does not get our pulse racing, no matter how shapely the QX Sport Inspiration concept that previews it may be. No midsize SUV does, to be fair. But it has something special under the hood – the world's first production variable-compression-ratio engine. That means the QX50's 2.0-liter turbo four, which makes 268 horsepower and 288 pound-feet of torque, will have up to 27 percent better fuel economy. Here's how it works. The trend of moving to smaller, turbocharged engines carries with it one big falsehood. Under low load when the turbo isn't needed, these engines are less efficient than an equivalent engine without a turbo because of the low compression ratio the turbo requires. That is, if you never need the extra power, you're wasting fuel. Turbocharged (and supercharged) engines use a lower compression ratio to prevent detonation. When you force extra air in a cylinder and mix it with fuel, it's more likely to prematurely go boom. Lowering the compression ratio prevents this problem, but it's less efficient. Infiniti's VC-T promises the best of both worlds, with a compression ratio that ranges from 8.0:1 for high-power turbo needs to a 14.0:1 ratio for fuel-sipping efficiency. At its heart the VC-T engine is a simple idea, but it's complicated to explain. Consider yourself warned. The photo below from Infiniti serves as a good visual overview. For the truly nerdy, this patent application covers the mechanical concept. Instead of having the pistons connected to the crankshaft, Infiniti's engine has a pivot arm with a connection on each end. One end connects to the piston, the other connects to a second lower shaft, which is controlled by an actuator arm. At any given time the engine's pistons move up and down according to the lobes on the crankshaft. But the actuator arm can change the angle of the pivot arm up and down. That is, the pistons still move in the same motion with the same stroke, but phase the entire stroke up or down. Move the pivot up and there's less room at the top, which means a higher compression ratio. Move the pivot down and the compression ratio goes down, too. As an added bonus, the lower shaft eliminates the need for counter-rotating balance shafts. Infiniti says this system works constantly and can vary the compression ratio to any number between 8:1 and 14:1. It also uses electronic variable valve timing on the intake valves to switch into Atkinson-cycle combustion for greater efficiency.

Nissan-Dongfeng's Leaf-based Venucia e30 EV goes on sale in China

Nissan's proverbial other shoe has dropped on the other side of the world. The Japanese automaker, along with Chinese company Dongfeng, has started selling the Venucia e30 battery-electric vehicle in the world's most populous country. How the sister vehicle to the Nissan Leaf will fare remains to be seen, but it's a pretty big bet. The companies certainly tested the model enough, very quietly running 300 trial vehicles a combined three million miles on China's roads. The result is a vehicle the companies say reduces operating costs by about 85 percent relative to gas-powered vehicles and can go 35 miles on a five-minute quick-charge. In China, the Venucia e30 retails for about $44,000, though that's before government incentives kick in. The car will debut with sales in Beijing, Shanghai, Guangzhou, Shenzhen, Dalian, Wuhan, Tianjin, Zhengzhou and Hangzhou. The rest of the country gets access to the model next year. Nissan and its Chinese partner are probably hoping for the kind of success Nissan's has finally started to have with the Leaf in the US recently. Last month, Nissan moved 3,186 Leaf vehicles Stateside, a monthly record. Year-to-date US sales of the Leaf are up 34 percent from last year to 18,841 units. You can find more info on the e30 in Nissan's press release below. DONGFENG NISSAN LAUNCHES ITS FIRST ALL-ELECTRIC VEHICLE - Venucia `e30' offers trusted, affordable, pure EV experience for Chinese consumers - SHANGHAI, China (September 10, 2014) - Dongfeng Nissan Passenger Vehicle Company (DFL-PV) today launches its first pure-electric vehicle model, "e30," from its local Venucia brand. With a five million kilometer pilot run across China completed prior to launch, e30 is trusted to bring Chinese consumers an enjoyable EV experience at affordable running costs. Its starting price is set at RMB 267,800 Venucia e30 Jun Seki, President of Dongfeng Motor Co., Ltd. (DFL), Nissan's joint venture with Dongfeng Motor Group Co., Ltd., said, "With Nissan Global's advanced technology, sales experience and know-how of electric vehicle, the Venucia e30 has been locally developed through our careful studies about market situations and consumer needs in China. I am looking forward to seeing the Venucia e30 lead China's electric-vehicle market into the future and also to more development of new energy vehicles and the wide adoption of electric vehicles in China." e30 achieves an optimal balance between driving range, affordability and convenient charging.

Is the Chevy Camaro Z/28 a Godzilla Slayer at the track?

Godzilla. It's a name that strikes fear in the minds and hearts of giant monsters (Mothra!) worldwide, not to mention a number of automobile manufacturers that produce high-performance coupes... including Chevrolet. The Bowtie-cladded company has one rather obvious model that lines up squarely in the sights of the Nissan GT-R, that being the Corvette.
Interestingly, though, Chevy's halo coupe isn't the vehicle the boys from Motor Trend decided to match up at Barber Motorsports Park against the Japanese Godzilla, opting instead for the brand-new Camaro Z/28. A glance at the spec sheet of the Z/28 clears up any consternation regarding MT's choice - more horsepower for the Nissan, more torque for the Chevy and roughly the same weight means they are on pretty equal ground when it comes to what's under the hood.
The rest of the spec sheet looks to tilt the argument in the GT-R's favor (especially considering that MT's test car is a Track Edition model), as it boasts all-wheel-drive traction, a quick-shifting six-speed dual-clutch transmission and a price tag that's about $40,000 higher than that of the Z/28. Oh, and don't forget the GT-R's legendary computer-controlled reflexes. Does any of that matter with a professional race car driver like Randy Pobst behind the wheel? Scroll down and watch the video to find out.