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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 GT-R and Ferrari 458 Speciale in track battle by Evo

Supercar slayer. That's what they call the Nissan GT-R. And in many ways it is, even though its price and performance over the years have risen to put it squarely in supercar territory of its own right.
In fact, as Evo magazine has been compiling a list of its fastest cars - using the Anglesey Circuit in Wales as its common ground - the GT-R has came out on top... that is, until Evo tested the Ferrari 458 Speciale. The two are about as different as you can get within the supercar segment: one has a turbo six up front driving all four wheels in a 2+2 configuration, the other a mid-engined, rear-drive V8 two-seater. In fact the only common ground you're likely to find between them comes down to their two doors and dual-clutch transmissions. Though they serve it up in different ways, both are class-leading performers.
We're looking forward to watching Evo populate its leaderboard with more entries like the McLaren 650S and more potent Nismo GT-R, but in the meantime the British enthusiast magazine, by popular demand, has released side-by-side in-car footage of both supercars putting their best lap forward around the seaside circuit.

EZ-Charge program will get rolled out for all vehicles [UPDATE]

UPDATE: It appears that Chargepoint has pulled out of the program. It looks like a myriad of vehicles will be eligible for the single-card recharging program under NRG Energy's NRG eVgo division. The EZ-Charge platform that Nissan said last month would allow Leaf owners to use multiple vehicle recharging networks with a single card will soon be offered to other plug-in vehicles. eVgo will start sending out EZ-Charge cards this summer to various markets in Northern and Southern California and Texas as well as the Pacific Northwest, Phoenix, Nashville and Washington, DC. EZ-Charge uses a single card that is good for eVgo stations as well as stations within the ChargePoint, Blink and AeroVironment networks. It will debut in 10 EZ-Charge markets on July 1. By mid-2015, 15 more markets will be added. Nissan announced the 'No Charge to Charge' program last month at the New York Auto Show. Nissan said at the time that Leaf buyers would get two years of free charging, but individual charging sessions were limited to 30 minutes at CHAdeMO stations and an hour at the more-common Level 2 stations. The automaker also estimated that the 25 markets included by next year account for more than 80 percent of US Leaf sales. Take a look at NRG's press release below. NRG eVgo Introduces New Convenience to Electric Vehicle Charging First-of-Its-Kind EZ-Charge All-Access Card gives EV drivers convenience to use chargers from multiple charging providers PRINCETON, N.J.--(BUSINESS WIRE)--This summer, NRG eVgo, a subsidiary of NRG Energy, Inc. (NYSE:NRG), will roll out the EZ-Charge (SM) platform, a first-of-its-kind initiative that will offer electric vehicle (EV) drivers the ability to access multiple EV charging networks with a single all-access card. "For too long, EV drivers have been limited to only the chargers that were in their network meaning they might drive past a number of charging stations in other company's networks before they could get to one they could use with their current provider" The EZ-Charge platform will enable drivers of any electric car make or model to carry a single access card for charging on multiple networks, much like consumers today carry a single credit card to access multiple retailers.