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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.

2015 Nissan GT-R Nismo to pack 595 hp, lap N"urburgring in 7:08

With two major auto shows taking place this week on different sides of the globe, the amount of news being posted across the internet is reaching a fever pitch. Naturally, things happen, trigger fingers get itchy and stories get leaked, which is apparently how we came across this spate of premature pictures and information on the eagerly anticipated Nissan GT-R Nismo.
Packing 595 horsepower and 480 pound-feet of torque from its twin-turbocharged, 3.8-liter V6, the Nismo-fied GT-R should be a serious kick in the pants when run hard. The new power is thanks to a number of donor parts from the GT-R Nismo GT3 racecar, bits that include larger turbochargers, revised intake and exhaust systems and new ignition timing.
Thanks to the engine enhancements, and, we imagine, a few other tweaks to the chassis, brakes and aerodynamics that have yet to be published, the GT-R Nismo is said to blitz the Nürburgring in just 7:08, a mere 11 seconds slower than the $845,000 Porsche 918 Spyder. For a car that is rumored to cost well under a quarter of the price, that performance is just immense.

Nissan teases new pickup again, this time with video

It was just yesterday that we were presented with our first teaser image of Nissan's new midsize pickup, ahead of its June 11 debut. Today, we have video of what is most likely the next-generation Frontier.
It does reveal a skosh more of the truck than the teaser, focusing on the grille, which should follow Nissan's familial pattern. There's also plenty of footage of the new truck in action, as well as a tiny glimpse of the cabin, which shows (we're guessing) an information display in the instrument cluster.
Take a look below for the video, and then be sure to check back here in one week for the official reveal of the newest Nissan pickup.