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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.

Renault's new Talisman smacks of Maxima [UPDATE]

UPDATE: Well, despite taking up virtually the same amount of space on the road, Nissan spokesperson Josh Clifton confirmed to Autoblog that there's "no linkage on the two vehicles," and that "they weren't developed in tandem." The story has been edited to reflect this information. While Renault and Nissan maintain a strong alliance, the amount of sharing between the two brands is generally pretty subtle. The two automakers haven't made a habit of rebadging the other's products, although we'd surely support rebadging the Renault Clio or Megane as the new Versa or Sentra, especially if the RenaultSport versions were rebadged as Nismo models. That's not likely to change with the new Renault Talisman The big four-door sedan is the latest vehicle to ride on Renault-Nissan's Common Module Family, which also underpins the current Espace MPV. While it may wear Renault's diamond logo and ride on the Espace's platform, the new Talisman sedan takes up almost exactly the same amount of space on the road as the new Nissan Maxima. There's less than two inches separating the two sedans' overall length and wheelbase, while differences in width and height are negligible. The similarities end with the size, though. While the Maxima is only offered with a 3.5-liter V6 and continuously variable transmission, the Talisman will be available with a range of four-cylinder engines. There will be three diesels, available in 110-horsepower, 130-hp, and 160-hp varieties, along with a pair of gas engines, delivering 150 and 200 hp, respectively. The diesels can only be mated to six-speed transmissions (manuals are available for the 110 and 130-hp models), while the petrol mills are limited to seven-speed dual-clutch units. The Renault will also offer four-wheel steering, in the form of the company's 4Control system, and active dampers. While not pictured here, the Talisman will also be offered as a five-door wagon. You can expect to see both the sedan and long-roof models when Renault shows its newest entries in September, at the 2015 Frankfurt Motor Show. Related Video: THE TALISMAN Renault's new saloon packs style and real driving enjoyment Renault is proud to reveal its new executive saloon. The evocatively named TALISMAN ticks all the boxes that D-segment customers have come to appreciate, while taking wellbeing and driving enjoyment to a new level. The Renault TALISMAN features a unique combination of: • Assertive styling: sleek, elegant lines.

Nissan GT-R LM Nismo pulls its way to Chi-town

We generally take it as a given that, as far as performance goes, rear-wheel drive is better than front. All-wheel drive can be better than either, in some cases, but you need power going to the wheels that aren't also handling the steering while leaving the others just tagging along for the ride. Right? Well Nissan is here to upend that notion with the new GT-R LM Nismo, presented here at the 2015 Chicago Auto Show. After supporting the DeltaWing project a couple of years ago and fielding its own ZEOD RC prototype last year, Nissan is returning to Le Mans this year with another oddball endurance racer. Only this time, it's going for gold, competing against the likes of Porsche, Audi and Toyota for the overall win in the top-tier LMP1 class. Tying this front-drive, 1,250-horsepower hybrid racing prototype to the all-wheel-drive GT-R may be tenuous, but we have to hand it to Nissan for shaking things up. In the process, Nissan has also confirmed the hot shoes who'll be tasked with manhandling this beast around the Circuit de la Sarthe (and the rest of the tracks on the 2015 FIA WEC calendar). Joining former Le Mans winner and longtime Ferrari test driver Marc Gene will be Super GT champion Tsuigio Matsuda as well as Harry Tincknell and Olivier Pla (both experienced from the largely Nissan-powered LMP2 field), Nissan factory driver Michael Krumm and GT Academy graduates Lucas Ordonez and Jann Mardenborough, both of whom have made their way into professional racing on the merit of their video gaming abilities. We'll be looking forward to watching them try to get the best out of this most innovative Datsun.