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Vettel and Coulthard drive Russia's very unfinished Sochi Circuit

The next Winter Olympics will happen in Sochi, Russia from February 7-23, 2014. Sometime after that, barring any delays, a portion of the Sochi Olympic Park will be turned into the Sochi Olympic Park Circuit, a 3.65-mile track for the first Russian Grand Prix in 100 years (the last of two Formula One grands prix were held in St. Petersburg).
As we've come to expect from the Infiniti Red Bull team, it recently sent Sebastian Vettel and brand ambassador David Coulthard to the unfinished venue to run the route in Infiniti M sedans and offer some impressions. With average cornering speeds above 62 miles an hour, Coulthard called it a fast street circuit in the Monaco vein. You can watch them try it out - yes, that's Vettel gone airborne above - and avoid a "White Van Man" in the video below.

2021 Infiniti Q50 gains more safety equipment and sporty-looking Sensory trim

Details for the 2021 Infiniti Q50 are out, and while it’s largely the same sedan as it was last year, Infiniti made some notable improvements. For starters, Infiniti made its suite of driver assistance equipment standard. This includes blind-spot warning, adaptive cruise control, lane departure warning, 360-degree camera with moving object detection, parking sensors, backup collision assist and auto high-beams. ItÂ’s a fairly comprehensive package that many luxury brands would make you pay a pretty penny for. Additionally, Infiniti is adding a Sensory trim level for 2021. ItÂ’s equipped with the 300-horsepower version of the 3.0-liter twin-turbo V6 engine. Infiniti also equips it with sport design front and rear fascias, leather sport seats, black open pore wood interior trim, black headliner and pillars and a 16-speaker Bose audio system. Both the Sensory and Red Sport 400 gain power-folding, auto-dimming outside mirrors in the new year, too. Appearance changes for the Red Sport 400 include a new matte black carbon fiber interior trim package and more black exterior trim highlights. You can see the carÂ’s slightly more menacing look in the photos at the top of this post. The rest of the Q50 lineup gains two new color options: Slate Gray and Grand Blue. Pricing for the base Q50 hasnÂ’t budged in the new year. Rear-wheel-drive models will still start at $37,625 and all-wheel-drive versions will begin at $39,625. The 2021 Infiniti Q50 is arriving in dealerships now. Related Video:

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.