2013 Infiniti M56 S 4dr M56s Satellite Radio, Navigation, Bluetooth, Backup Cam on 2040-cars

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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 portends seriously powerful future sports sedan

"If we built this car I would expect it to feature over 500 horsepower and 600 pound-feet of torque."
Eau Rouge is a notoriously difficult turn at Belgium's Spa-Francorchamps Circuit that is capable of striking fear into the hearts of the most hardened driver. Naming a car after something so terrifying, therefore, strikes us as a rather poor idea.

Infiniti plans overhaul of infotainment system by 2021

Infiniti is working on a fully overhauled infotainment system starting in 2021 that will feature bigger displays but retain the current dual-touchscreen setup. In the meantime, upgrades including Apple CarPlay and Android Auto connectivity will be added to existing systems starting next year, depending on the market. "Next year is going to be the first step of improvement," Infiniti's vice president of product strategy, Francois Bancon, told Australian outlet GoAuto. "And as we move forward with a bigger display, 12.0-inch, 15.0-inch, whatever, of course we are going to improve the accuracy." He also indicated that "only the media" complains about the dual-screen display and that customer feedback has been strong. "The appearance of the system, for example in QX50, which is the same as in Q50, we're not going to change. But we just redesign the whole system behind more capacity, faster reaction time, high-definition display and full connectivity." So the new system will keep the dual-screen setup, which today involves the top screen handling mostly navigation and redundant audio information while the lower screen is used to control vehicle, phone and audio functions (see the below video for more info on how it works). The QX50, which goes on sale in the United States later this year, will also be the first Infiniti to get a 9-inch color head-up display on the windshield, plus smartphone mirroring and data-derived weather and other apps. The rollout of a new infotainment system coincides with Infiniti's plan to build its first all-electric car in 2021 and release hybrids based on Nissan's e-Power technology. Parent company Nissan has said it wants to sell 1 million electric vehicles annually by 2022. Related Video: