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Nissan NV200 Chicago Taxi looking for a #HailYes

Nissan may be loaning out its small van to General Motors for its Chicago Auto Show debut, but that doesn't mean that Chevrolet is the only one with new NV200-based wares to share. On the heels of launching its Taxi Of Tomorrow for New York City, the Japanese automaker is giving America's Second City a livery of its own.
Shown here in a green and white paint scheme that "expresses a modern take on a historically popular Chicago taxi color," this NV200 Chicago Taxi is the company's less-than-subtle bid to capture some of the city's cab business, which is estimated to have about 7,000 units in service. Nissan is urging the public to generate discussion on social media and hopefully capture local taxi fleet operators' attention with a #HailYes campaign.
Beyond its unique appearance, this NV200 appears untouched, which means it's still powered by a 2.0-liter four-cylinder engine backed by a version of Nissan's ubiquitous XTronic continuously variable transmission.

Syrena Sport returns as rebodied Nissan 370Z

We wouldn't hold it against you if you'd never heard of the FSO Syrena Sport. FSO built the long-enduring Syrena for some 17 years nonstop, and while the machines were mostly plodding family sedans, engineers at FSO did create one version with a bit more zest. The Syrena Sport was a two-door coupe that borrowed design cues from Ferrari and was powered by a two-cylinder, air-cooled boxer engine. While originally intended for production, economic woes kept the machine from ever seeing the light of day.
Now, the Syrena Sport is back, though in a slightly different configuration. Entrepreneur Rafal Czubaj has resurrected the name for a special one-off creation designed by Pavlo Burkatskyy. This time around, there is no oddball boxer under the hood, however. Czubaj chose to use the underpinnings from the Nissan 370Z, complete with its 3.7-liter V6 engine. Buyers can choose between a 330-horsepower tune or a 450-hp iteration, and with a curb weight of 2,865 pounds, the car should be plenty quick. Expect acceleration to 60 miles per hour in around 4.5 seconds and a top speed of 180 mph.

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.