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Mitsubishi admits to tampering with fuel economy data

Mitsubishi admitted this week to intentionally rigging fuel-economy testing in four of its models sold in Asia. The affected models are all so-called Kei class cars with sub-660cc engines manufactured at Mitsubishi's Mizushima plant in Okayama, Japan. About 157,000 of those cars are Mitsubishi eK wagons and eK Space models, and 468,000 are re-badged Nissan Dayz and Dayz Roox cars, which Mitsubishi produces for Nissan. The matter came to light after Nissan found inconsistencies in reported mileage data, which then led to Mitsubishi launching an internal investigation. The fraud was discovered to be related to falsified tire pressure data, which has an effect on mileage results – an important matter considering these kinds of vehicles are marketed by fuel economy. Mitsubishi said it has stopped manufacturing and marketing the affected vehicles. The news caused Mitsubishi's stock to plummet over 15 percent, slicing $1.2 billion off the company's value. When the eK models hit the market three years ago, they were decorated with a Good Design Award by the Japanese Ministry of Economy – a merit that is now surely tarnished. While Mitsubishi has been suffering in the US recently, with news of the Normal, Illinois plant closing, its small Mirage model has sold well. Related Video: Image Credit: Getty Images Green Plants/Manufacturing Mitsubishi Nissan Fuel Efficiency Hatchback Minivan/Van kei cars minicars

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.

NISMO confirms hotter GT-R, return to Le Mans and more performance models [w/videos]

Nissan has made three announcements, all of which intend to sharpen the global significance and sales of its NISMO performance arm. Calling it "a new era for NISMO as its global performance car and motorsports brand," Carlos Ghosn cut the ribbon on the new, larger, nicer NISMO headquarters in Yokohama, Japan. For the first time since the division was founded in 1984, all of its employees are located in one place that was dubbed "a hothouse of passion and performance." Sign us up.
There, the team will start overhauling Nissan's entire range with NISMO models. The Juke NISMO is right around the corner for the US market, the second generation of the 370Z NISMO is coming for 2014, the first GT-R NISMO is being developed, and after that will come "a range of affordable performance Nissan models from small cars to flagship sports cars" - a new model every year. The expanded product line will mean that markets that haven't had access to NISMO's works will finally be able to buy them.
The last big news is that from now on NISMO will manage every one of Nissan's global motorsports programs, and its largest initiative will be prepping an entry for Le Mans in 2014. While Nissan has left the DeltaWing project, it hasn't walked away from experimental racers: the brand aims to have "a pioneering Nissan race car showcasing electric technology" ready in 15 months that shows "a new approach to innovation and excitement."