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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.

These 'blind' automotive world record stunts have to stop

Drivers setting world records "blind" – wearing a blindfold or with something obscuring the windshield – is the new thing for some reason. First it was an Alfa Romeo Giulia setting a blind lap at Silverstone with help from a spotter trailing behind, and now this: a stunt man doing a J-turn within a narrow path with nothing but a Nissan Juke's cameras guiding him. He matched the "sighted" J-turn record, flipping the car around in a space about 7 inches longer than the car. I have two issues with these stunts. First, there are just too many world records. Yeah, I said it. Are these meaningful? Is someone else likely to ever attempt this feat? No, because it's just marketing, both for the manufacturer and whoever's still trying to sell those annual books. Stuff like the fastest production car is fine with me. Heck, I'll even take unofficial Nurburgring times – the kind where the drivers can actually see. Second, I'm all for stunts, but do something cool! And preferably something that could only be performed with that particular car, if you're going to make an ad out of it. Yes, the Juke has an Around View Monitor system, which stitches together feeds from four cameras to make it look like the car is being filmed by a drone hovering overhead. I happen to love 360-degree cameras – they let you see things that are just not visible from the driver's seat and make parking and low-speed maneuvering really easy. But the Juke isn't the first car to offer one, and the feature isn't even new to the car. Nissan was at least forthright enough to admit that this professional driver (on a closed course!) had a bunch of practice. But this really says more about his precision driving skills than about the car, or the camera. And just so we're clear, you really shouldn't try to park a car without looking out the windows, even if you have fancy cameras. So what's next? Pretty soon there will be a record for blindest blind stunt. Let me know when someone actually does something interesting. Related Video:

2014 Nissan GT-R Track Edition loses rear seats, gains performance

Nissan is adding yet another tier to the GT-R hierarchy for 2014 with the GT-R Track Edition. Debuting at the 2013 Chicago Auto Show, the bruiser ditches its back seat in the quest for a lower curb weight, and a set of more seriously bolstered front buckets keep occupants planted once the going gets twisty. The Nürburgring-developed Track Edition offers an integrated carbon fiber front splitter with brake cooling ducts as well as an even harder-core suspension. Engineers swapped the stock bits for special Bilstein DampTronic shocks and paired them with more aggressive springs.
The engine still delivers 545 horsepower and 463 pound-feet of torque and still relies on the split-second quickness of the standard GT-R's six-speed dual-clutch transmission. Expect to see just 150 examples of the 2014 Nissan GT-R Track Edition land on American shores starting this May. In the interim, check out the full press release below for more information.