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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 ZEOD RC finds nothing but trouble at 2014 Le Mans

Audi came away a big winner at this year's Le Mans competition, but Nissan has at least one thing to celebrate. The Pyrrhic victory apparently presages Nissan giving up on the gas-electric race car for Le Mans 2015. Before the race this weekend, the prototype ZEOD RC hybrid race car was doing quite well. In fact, given the way things turned out, Nissan's keen to mention that team engineers managed to get the car to complete a lap on electric power and hit a target speed of 300 kilometers per hour (186 miles per hour) on the Mulsanne Straight during testing. ZEOD RC stands for Zero Emission On Demand Racing Car. "The race was obviously very disappointing" – Wolfgang Reip Things didn't go so well once the real race started. The problem for the Deltawing-esque prototype – which is powered by a 1.5-liter gas ending putting out 400 horsepower and a pair of 110-kW electric motors – was that something broke in the transmission after just 23 minutes and five laps. Driver Wolfgang Reip put his best spin on the hybrid's collapse: "The race was obviously very disappointing but having got a taste of Le Mans now, I can't wait to get back." If Reip does return with Nissan, it will likely be in a more traditional Le Mons racer. The ZEOD RC was part of the LM P2 class, but Nissan says that, "For Le Mans 2015, Nissan will return to the LM P1 class." You can watch the full warm-up electric lap in a video below. This content is hosted by a third party. To view it, please update your privacy preferences. Manage Settings. Nissan ZEOD RC heroic electric lap followed by heartbreak Amazing morning warm-up result after all-nighter by crew "New tech" car halted by "old tech" issue Nissan breaks new ground in electric vehicles LE MANS, France – Nissan's assault on the Le Mans 24 Hours may have ended early, but the revolutionary Nissan ZEOD RC electric prototype still leaves Le Mans having reached its historic goals of hitting 300 km/h on the Mulsanne Straight and recording a complete lap of Le Mans on electric power only. The unique prototype – which features both internal combustion and electric power sources – reached its first target during Thursday night qualifying when Satoshi Motoyama exceeded 300 km/h before the first chicane on the Mulsanne Straight. Nissan's other key goal was to complete an entire 8.5-mile lap of Le Mans on pure electric power. GT Academy winner Wolfgang Reip was at the wheel when the team achieved this goal during the morning warm-up.

Nissan IDX sports coupe future increasingly cloudy [w/poll]

There's a strong desire among enthusiasts for more inexpensive, lightweight, fun-to-drive, rear-wheel-drive cars to exist in a world that contrasts sharply with automakers' desire to make money. While we all love the feeling of controlling the back end with the throttle, front-wheel drive is king when it comes to affordable cars. One of the future bright spots in the rear-drive market appeared to come from Nissan with its pair of IDx concepts. The two showcars from the 2013 Tokyo Motor Show took liberal design inspiration from the classic Datsun 510 and mixed it with modern powertrains in very attractive little packages. However, some pretty dark clouds are reportedly now hanging over the project.
Last we heard, a production version was supposedly "in the plan" from the Japanese automaker, but its trajectory may have changed inside the company in the last few months. According to Pierre Loing, vice president of product planning for Nissan Americas, the issue is making the sports coupe profitable. While Nissan has access to rear-wheel drive platforms, they are all meant for more premium vehicles (read: they cost too much). Assuming around 60,000 annual sales, Loing tells Ward's Auto that making a dedicated chassis for the IDx just isn't a moneymaker. If the car still does see production, it'll be after 2016, he says.
The decision whether to build the IDx has been teetering for a while. Nissan spokesperson Dan Bedore previously told Autoblog that the coupe would need a groundswell of support from consumers and enthusiasts if is to actually have a shot at production. If you are among the hopeful looking to see this affordable, rear-drive performance car in showrooms, get some friends together and start letting Nissan know that you actually want it - you can start here by adding a Comment and voting in our poll, because we're going to send the results on to Nissan.