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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.

Watch Nissan prank unsuspecting test drivers with GT Academy

Nissan's reality show/motorsports program, GT Academy, is set to return to Spike TV for its fourth season on Friday, and in anticipation, the Nismo team has issued a new video that gives some of its fans a taste of the racing lifestyle.
It all starts innocently enough, with fans test-driving a 2015 Nissan 370Z Nismo, only to have a sudden stop quickly transforms things into something a bit more exuberant and special. We won't spoil the details, so take a look at the video for yourself, and then head into Comments and let us know what you think.
GT Academy will air on Spike TV, Friday nights at 11:30 PM Eastern.

Nissan could report first quarterly loss since March 2009

TOKYO — Nissan may report its first quarterly loss in more than a decade on Thursday because of slumping sales, sources familiar with the company said, adding more pressure on efforts to rebuild the company after Carlos Ghosn's ouster. Deteriorating profits underscore the challenges facing Nissan, which is unwinding many of the expansionist strategies championed by ex-Chief Executive Officer and Chairman Ghosn by slashing jobs, production sites and product offerings to save cash and ensure its survival. In addition to slumping sales, production disruptions caused by China's coronavirus outbreak could also drag profits lower. Three senior officials at Japan's No. 2 automaker told Reuters that they anticipate a poor results announcement on Thursday, with one of them calling the figures "dismal". Two of the officials cautioned that there is the possibility of an operating loss, which would be the first quarterly loss since the period ending in March 2009. Nissan said it could not comment on its financial results ahead of its official announcement. The company is likely to report operating profit of 48.6 billion yen ($442.5 million) for the quarter ending in December, less than half the 103 billion yen profit a year ago, according to SmartEstimate's survey of three analysts, who revised their forecasts in January. However, those forecasts were issued before the release of the December vehicle sales figures on Jan. 30, which show third-quarter sales dropped by 11% from the year earlier period, according to Reuters calculations. That is the biggest quarterly slump of its current sales downturn that began two years ago. That sales decline led one auto equities analyst based in Japan to scrap his forecast and also warn that Nissan could post a loss. "It will be a question of whether there will be a profit or a loss. For the quarter, a loss is a possibility," he said, declining to be named as his forecast had not been updated to reflect his latest view. One of the three Nissan officials said there is a risk the automaker may cut its full-year profit forecast of 150 billion yen, which would be an 11-year low. The company announced that forecast in November after an initial 230 billion yen outlook.