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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.

Recharge Wrap-up: Rimac Concept One vs. Bugatti Veyron, Tesla Autpoilot in the snow

Watch the Rimac Concept_One and the Bugatti Veyron drive head-to-head along the Croatian coast. Rimac Automobili founder Mate Rimac invited the Earl of Pembroke to drive his 1,088-horsepower EV, while he'd drive Lord Pembroke's Bugatti for comparison. Besides the scenic coastal roads shown in this first film, the pair also drove on a racetrack and an airfield. More episodes – and a drag race – are to come. Watch the video above, and read more at Teslarati. Watch how Tesla Autosteer operates in the snow at night, with no lane markings and no lead vehicle. While Tesla doesn't recommend using Autopilot in these conditions, it seems to manage rather well. Even thought the system shows that it doesn't always recognize the curb, the car doesn't instruct the driver to take control. It's possible that data plays a key role when there aren't other guiding factors on the road, and Tesla's high resolution mapping and the car's GPS could help navigate when there is little sensor input. See the video and read more at Electrek. Andromeda Power shows how a Nissan Leaf rescue car can charge a Tesla Model S. Andromeda Power uses its V2V Orca Inceptive onboard charger, which is meant for CHAdeMO to CHAdeMO charging. It requires a lot of equipment, including a CHAdeMO Tesla adapter, but it's definitely one way to feed a Tesla enough juice to get to the nearest charging station. Read more at Inside EVs. Hyundai increase the range of its Tucson Fuel Cell by 30 percent. The next generation of the hydrogen powered Hyundai is expected in early 2018, and range will jump from 265 miles on a full tank to 348 miles. That surpasses the Toyota Mirai's 312-mile range, but not the 366 miles of the Honda Clarity Fuel Cell. Read more at Green Car Reports, or from the Nikkei Asian Review. Related Gallery Rimac Automobili Concept_One View 35 Photos News Source: Electrek, YouTube: KmanAuto, Teslarati, YouTube: Wilton Classic & Supercar, Inside EVs, Green Car Reports, Nikkei Asian Review Green Bugatti Hyundai Automakers Nissan Tesla Green Automakers Autonomous Vehicles Electric Supercars Videos recharge wrapup

Infiniti Q50 Eau Rouge gets the heart of a GT-R [w/video]

There has been ongoing talk of an Infiniti using the Nissan GT-R powertrain practically since the moment the Nissan's flagship sports coupe hit the road. While the rumors have gone back and forth over the years, they have never completely gone away. It seems Infiniti is finally turning an ear to the screams of its most vocal enthusiasts with an updated version of the Q50 Eau Rouge concept boasting a modified version of Godzilla's engine and all-wheel drive system debuting at the 2014 Geneva Motor Show. It's even taking things a step further and granting it a new, seven-speed transmission to replace the Nissan's six-speed.
The latest evolution of the Eau Rouge packs the same 3.8-liter, twin turbocharged V6 found in the GT-R but with a unique tune of 560 horsepower and 443 pound-feet (600 Newton-meters) of torque. That makes it 15 hp more powerful than the standard 2015 GT-R but gives up 20 lb-ft of torque. Power gets to the ground through the GT-R's all-wheel-drive system. Infiniti predicts that the Eau Rouge would sprint to 60 miles per hour in less than 4 seconds and on to a top speed of 180 mph.
According to Infiniti Communications Senior Manager Kyle Bazemore in an email to Autoblog, the modded GT-R powertrain was not the only choice for the Eau Rouge. It also considered "developing a high-power sports diesel" and hybrid versions with an electric supercharger. However, "this was the clear solution for this concept car," Bazemore said. Other than the drivetrain, the Eau Rouge in Switzerland is identical to the one shown in Detroit. Sadly, it is not confirmed for production; so we might not be getting the fabled Infiniti GT-R sedan any time soon. Still, we can hope.