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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 signs four-year deal to become title sponsor of Red Bull Racing

The chief of Infiniti's Formula One motorsport involvement, Andreas Sigl, said just last week that the brand was "going longer and deeper" into its collaboration with Red Bull, and the proof has already come: the Japanese luxury brand has signed a four-year deal to become the title sponsor of Red Bull Racing. From next year the team will be Infiniti Red Bull Racing.
The move cements Infiniti's intention to make the most of the already-ongoing technical collaboration it has had with Red Bull Racing for two years - this year Milton Keynes team has been testing Infiniti's Scratch Heal paint for aero properties and during the young driver test it used KERS batteries that were wholly developed by Infiniti's parent company, Nissan.
Earning a tip of the hat for not giving into cheap-trick branding, the engines will continue to be branded as Renault. Renault/Nissan CEO does not "want any confusion within the Alliance as to who does what."

2015 Infiniti QX80 gets a minor refresh, fancy new trim

Infiniti revealed an ever-so-slightly refreshed QX80 alongside its Q70 luxury sedan this morning in New York. The biggest news for the brand's fullsize SUV is the addition of a range-topping trim level, unimaginatively dubbed the QX80 Limited.
The Big 80 sports a couple of styling tweaks in an effort to bring its appearance more in line with the brand's current design language. The "double-arch" grille with mesh inserts we first viewed on the Q50 now adorns the front fascia, and the head and taillights have gone full-LED. Still, it's hard to call this SUV anything but ugly. It's bulbous and almost brutish, which aren't generally words you want to have to use when talking about any kind of luxury vehicle.
There aren't many updates inside or to the drivetrain, either. Like the Q70, Infiniti has added a couple of new tech features, such as its Predictive Forward Collision Warning system and High Beam Assist. Although it's getting a bit long in the tooth, the interior remains nice, with lots of wood and leather all around. The SUV continues to use a 5.6-liter V8, which produces 400 horsepower and 413 pound-feet of torque, mated to a seven-speed automatic transmission.