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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.

Infiniti Q50 Eau Rouge to cost over $100,000?

Enthusiasts have been clamoring for Infiniti to build a car like the Q50 Eau Rouge for years. In concept form, it employs the GT-R's much-loved 3.8-liter twin-turbo V6, tuned to produce 560 horsepower and 442 pound-feet of torque, with the whole works slid underneath fetching luxury sedan bodywork with carbon fiber aero aids. At this point, the model is rumored to be all but certain for production. The company recently even put Sebastian Vettel in one to show it off. However, Infiniti President Johan de Nysschen is suggesting that the model's lifetime could be brief, limited and rather expensive.
The Infiniti boss recently gave a long interview to Motor Trend that spilled a lot of beans about the Eau Rouge. While he refused to officially admit that the super sedan was on the way, he admits that he's "pushing the Eau Rouge concept for commercialization."
According to de Nysschen, if built, the production version will hew closely to the concept with the engine from the GT-R, but the seven-speed automatic transmission and all-wheel drive system will come from the Q70. And while that would make the Eau Rouge a performance powerhouse, it might also be a rarity on the road:

Nissan IDX sports coupe future increasingly cloudy [w/poll]

There's a strong desire among enthusiasts for more inexpensive, lightweight, fun-to-drive, rear-wheel-drive cars to exist in a world that contrasts sharply with automakers' desire to make money. While we all love the feeling of controlling the back end with the throttle, front-wheel drive is king when it comes to affordable cars. One of the future bright spots in the rear-drive market appeared to come from Nissan with its pair of IDx concepts. The two showcars from the 2013 Tokyo Motor Show took liberal design inspiration from the classic Datsun 510 and mixed it with modern powertrains in very attractive little packages. However, some pretty dark clouds are reportedly now hanging over the project.
Last we heard, a production version was supposedly "in the plan" from the Japanese automaker, but its trajectory may have changed inside the company in the last few months. According to Pierre Loing, vice president of product planning for Nissan Americas, the issue is making the sports coupe profitable. While Nissan has access to rear-wheel drive platforms, they are all meant for more premium vehicles (read: they cost too much). Assuming around 60,000 annual sales, Loing tells Ward's Auto that making a dedicated chassis for the IDx just isn't a moneymaker. If the car still does see production, it'll be after 2016, he says.
The decision whether to build the IDx has been teetering for a while. Nissan spokesperson Dan Bedore previously told Autoblog that the coupe would need a groundswell of support from consumers and enthusiasts if is to actually have a shot at production. If you are among the hopeful looking to see this affordable, rear-drive performance car in showrooms, get some friends together and start letting Nissan know that you actually want it - you can start here by adding a Comment and voting in our poll, because we're going to send the results on to Nissan.