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Nissan's Le Mans prototype V6 to power next GT-R

You can debate all you want about whether racing has any relevance to road cars. And while you're doing that, Nissan will be getting the most out of its GT-R LM Nismo. In fact, the latest reports indicate that the Japanese automaker will use the engine (or some version thereof) in the next-generation GT-R. The Nissan GT-R LM Nismo, for those who may have missed it, is the company's radical attempt to take on the Audis, Porsches and Toyotas of the top-tier LMP1 class in the FIA World Endurance Championship. And to do so at its flagship event, the 24 Hours of Le Mans. Only unlike its rivals, it's not a mid-engined, all-wheel-drive design; both the engine and the driven wheels are at the front end. That engine, however, isn't actually all that radical. It's a 3.0-liter twin-turbo V6 producing 550 horsepower. Potent, but nothing earth-shattering. In fact it's not far off from the 545-hp 3.8-liter unit in the current production GT-R. And according to Top Gear, in speaking with the racing program's director Ben Bowlby, it will be essentially the same engine that will power the next road-going GT-R. Now if you're thinking that something's missing here, you're right: the GT-R LM Nismo packs a lot more than 550 horses. It actually has over 1,250 on tap. The remaining 700 hp are kicked in by the electric component of the racing prototype's hybrid powertrain. The next GT-R is widely expected to incorporate hybrid technology as well, but it won't be good for 700 hp all on its own. And it will almost certainly be driving all four wheels like the current version. Related Video:

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.

Uber promises 100% electric cars by 2040, commits $800 million to help drivers switch

Uber Technologies Inc on Tuesday said every vehicle on its global ride-hailing platform will be electric by 2040, and it vowed to contribute $800 million through 2025 to help drivers switch to battery-powered vehicles, including discounts for vehicles bought or leased from partner automakers. Uber said that vehicles on its rides platform in the United States, Canada and Europe will be zero-emission by 2030, taking advantage of the regulatory support and advanced infrastructure in those regions. Uber, which as of early February said it had 5 million drivers worldwide, said it formed partnerships with General Motors and the Renault-Nissan-Mitsubishi alliance. In addition to the vehicle discounts, Uber said the $800 million includes discounts for charging and a fare surcharge for electric and hybrid vehicles, the cost of which would be partially offset by an additional small fee charged to customers who request a "green trip." The deals with GM and the Renault alliance focus on the U.S., Canada and Europe. Uber said it was discussing partnerships with other automakers. Uber's plan follows years of criticism by environmental groups and city officials over the pollution and congestion caused by ride-hail vehicles and calls for fleet electrification. Lyft Inc, Uber's smaller U.S. rival, in June promised to switch to 100% electric vehicles by 2030, but said it would not provide direct financial support to drivers. Uber said its goal is to reduce the overall cost of ownership for electric vehicles, which are currently more expensive than gasoline cars. The company also released data on its emission footprint and said it would publish reports going forward. Before the pandemic, electric cars accounted for only 0.15% of all U.S. and Canadian Uber trip miles — roughly in line with average U.S. electric car ownership. At around 12%, the share of plug-in hybrid and hybrid cars was roughly five times as high as the U.S. average. Ride-hail trips overall account for less than 0.6% of transportation-sector emissions, according to U.S. data, but the total number of on-demand vehicles has significantly increased since Uber's launch nearly a decade ago, with 7 billion trips last year, according to Uber's February investor presentation. Uber said its U.S. and Canadian trips with a passenger produce 41% more carbon dioxide per mile than an average private car once miles spent cruising between passengers are included. Uber's plans could be a boon to the auto industry.