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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.

Infiniti parts ways with Red Bull Racing

The partnership between Infiniti and Red Bull Racing is done. The team announced that it will no longer run under branding from the luxury automaker and will drop the Infiniti name from its own. The shift is effective at the end of this year. Infiniti signed on as a sponsor of the Formula One team back in 2011 when Red Bull was at the height of its dominance and on the path to the second of four consecutive world championships. Two seasons later it stepped up to naming rights, with the team officially rebranded as Infiniti Red Bull Racing. But while the cars ran under motivation from the automaker's ally Renault, they stopped short of rebranding the engines as Infiniti's, leaving it in the unusual situation of being a title sponsor of (but not directly involved in) an F1 racing team. For next season, Red Bull will continue running the Renault power unit, albeit rebranded under the TAG Heuer name. In the process, the team will no longer have any branding from the French automaker or any of its associated brands. Meanwhile sister-team Toro Rosso is switching from Renault to Ferrari power for next season, while Lotus is prone to switch back to Renault engines and ownership. The French automaker also recently canceled its support of the feeder series known until now as Formula Renault 3.5. Infiniti has carried out only limited racing programs in its quarter-century history. Aside from the Red Bull partnership, it directly sponsored Sebastian Vettel up until his departure for Ferrari. The company also supplied IndyCar engines in the late 1990s, then sponsored the Indy Lights series for a few years. It recently helped a privateer team prepare a Q50 for the British Touring Car Championship, but otherwise hasn't had any top-tier factory racing programs to speak of. That makes it one of the few Renault Nissan Alliance brands (and Japanese automakers) not to actively participate in motorsports. Related Video:

2017 Infiniti QX30 price anounced ahead of September launch

The 2017 Infiniti QX30 will start at $30,945 for the base model and will max out at $39,495 for the Sport trim. The oversized hatchback will be available in six different trims: the QX30, QX30 Luxury, QX30 Premium, QX30 Sport, QX30 Luxury AWD, and QX30 Premium AWD. There will also be a 2017 QX30 Reservation Program for buyers interested in getting their hands on the car first. Buyers in the program will be able to choose from a selection of gifts to go along with their new QX30. The QX30 Luxury starts at $33,595, while its AWD variant is $1,800 more. The QX30 Sport, which is front-wheel drive only and is 0.6 inches lower than the rest of the lineup, is priced at $39,495. The QX30 Premium will start at $36,295 with the QX30 Premium AWD commanding an additional $2,400. All trims are powered by a 2.0-liter turbocharged inline-four that puts out 208 hp and sends power to a seven-speed dual-clutch gearbox. While the QX30 borrows a lot of components from the Mercedes-Benz GLA-Class, it's priced lower than its German counterpart. The Mercedes GLA250 starts at $33,775, while the GLA250 4Matic is priced at $34,775. The QX30 also comes in under the Acura RDX ($36,510), BMW X1 ($34,095), Audi Q3 ($34,625), and the larger Lexus NX 200t ($35,915). The QX30 will hit showroom floors in September.Related Video: This content is hosted by a third party. To view it, please update your privacy preferences. Manage Settings. Featured Gallery 2017 Infiniti QX30 View 19 Photos News Source: InfinitiImage Credit: Infiniti Infiniti Mercedes-Benz Crossover Hatchback Luxury infiniti qx30