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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.

Nissan Altima takes first V8 Supercars win

The V8 Supercars championship used to be strictly a contest between Holden and Ford. But just as BMW crashed the Audi and Mercedes party in DTM, so has Nissan (and for that matter, Mercedes) pushed past the door into Australia's popular touring car series. And like BMW, Nissan hasn't waited long before notching its first victory.
Nissan claimed the checkered flag this weekend in the first of three races at Winton, the ninth stop on the calendar. And what a spectacular win it was: not only did Nissan take the checkered flag, they finished one-two. James Moffat drove his Altima to the finish line just ahead of teammate Michael Caruso. It was Caruso who lead the first half of the race after qualifying just behind defending champion (and current points leader) Jamie Whincup, who suffered a gearbox malfunction and retired on only the ninth lap.
Of course that's just one race out of 27 so far and 37 scheduled this season, so that won't be elevating Nissan or any of its drivers to the lead the same way that BMW did upon its return last season to DTM, but it's a good start and a cause to celebrate for Nissan. Mark Winterbottom (Ford) and James Courtney (Holden) won the following two rounds at Winton as Jamie Whincup (Holden) leads Will Davison (Ford) in the standings.

Nissan reviving Pulsar name for Euro market

The Nissan Pulsar doesn't have what we'd consider a rich history in the US, other than on some models decades ago. However, the nameplate has been part of the Nissan lineup globally since 1978 and has proven popular in Asia and Australia. Now, the brand is teasing a five-door hatch to revive the name and hit European showrooms this fall.
The new Pulsar will be built at the company's recently renovated factory in Barcelona, Spain. It's not clear from the teaser whether this is the same model that is already sold in other parts of the world or a brand new vehicle. Although, Nissan says in the announcement that the car "has been designed to meet the specific demands of European car buyers."
With competitors like the Volkswagen Golf and Ford Focus, the European five-door hatch market is seriously competitive. It will be interesting to see if Nissan will have something special to bring to the table. Scroll down to read Nissan's full teaser about its latest hatchback in Europe.