2005 Nissan 350z Roadster on 2040-cars

Auto blog

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.

Ghosn out at Nissan, still in at Renault, still in jail in Tokyo and facing more charges

When the corporate jet carrying Renault- Nissan- Mitsubishi CEO Carlos Ghosn landed at Tokyo Haneda airport on November 19, Japanese authorities had already taken position on the tarmac, waiting for him. Police and authorities representing Tokyo prosecutor's office boarded the plane to query Ghosn about financial improprieties, and ended up taking Nissan's chairman and CEO into custody. A few days later, on November 22, Nissan's board voted to remove Ghosn from both positions for what it classified as "significant acts of misconduct." The charges include understating his income in filings to the Tokyo Stock Exchange by at least $44 million, and misusing company funds. Japanese police arrested Greg Kelly as well, the high-ranking Nissan exec said to have assisted Ghosn in the subterfuge. Ghosn and Kelly remain on Nissan's board until a shareholder vote is held to decide those positions. Kelly was Nissan's first American director, and the carmaker's former head of human resources. In France, Renault's board voted to keep Ghosn in his positions, and has requested details from Nissan about the alleged improprieties. The board put Thierry Bollore in the role of deputy CEO with all of Ghosn's powers while Ghosn is "incapacitated," and lead independent director Philippe Lagayette will act as temporary chairman. Nissan has since told Renault that it is investigating financial malfeasance at RNBV, the Amsterdam-based joint-venture company that oversees the alliance. Mitsubishi has watched from afar, only saying it will perform its own investigation, and could remove Ghosn. Tokyo police can hold a suspect for 72 hours for initial questioning without charges. With the deadline looming, Tokyo prosecutors asked the court for, and were granted, a ten-day extension. If they choose, prosecutors can request another ten-day extension. Within 23 days, however, prosecutors either need to charge Ghosn and Kelly, or release them. There are several charges that acquire more details by the day. The most serious accusation is that Ghosn understated his pay from 2011 to 2015 by half, claiming roughly $44 million in remuneration when he actually received around $88 million. Over the weekend, it came out that Japanese prosecutors could be working on new charges of Ghosn under-reporting his salary since 2015 by $27 million. A Japanese newspaper said Ghosn told Kelly in an email to lie on the financial statements.

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.