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Infiniti Q50 Eau Rouge running prototype driven by Sebastian Vettel

Infiniti's high-performance Q50 Eau Rouge concept might be one of the biggest teases in the current automotive world. It was first shown at the 2014 Detroit Auto Show as a body without an engine. Then, the sports sedan arrived at the Geneva Motor Show with a modified version of the turbocharged V6 from the GT-R under the hood, tuned to 560 horsepower and 443 pound-feet of torque, and with all-wheel drive. However, it was still just a concept. Finally, the Japanese luxury automaker is showing us what the Eau Rouge can do on the road - briefly.
The company brought reigning Formula One champ Sebastian Vettel along to get behind the wheel, for this all-too-short video from the Millbrook Proving Ground in the UK. There's more good news too. While Infiniti isn't saying that it's definitely going to build the Eau Rouge, it is "pressing ahead with the evaluation." More info about these tests will be released at the 2014 Beijing Auto Show at the end of April. Scroll down to watch Vettel drive the Q50 Eau Rouge and read a little more about it.

Infiniti Q50 Eau Rouge racing toward Detroit with Red Bull in its veins

There are several ways an automaker can get into Formula One racing. It can start its own team from scratch (like Toyota did in 2002), it can buy an existing team (like BMW did with Sauber in 2005) or it can supply engines to other teams (as so many manufacturers have done over the years). Infiniti chose another direction and opted to sponsor the world-champion Red Bull Racing team.
Infiniti has undoubtedly poured millions into its partnership with Red Bull since it started in 2011, but aside from the Sebastian Vettel edition FX (which technically emerged from the company's sponsorship of the driver as separate from the team), the tie-in has yet to translate into a Red Bull-tuned (or at least -inspired) Infiniti for the road. But that's just what Nissan's premium brand has in store for us at the upcoming Detroit Auto Show in January.
Well, almost, because the concept just announced is still a step or two away from reaching your local Infiniti dealership, but here it is just the same. It's called the Q50 Eau Rouge, and it's based on the company's latest tech-laden sports sedan. It takes its name, of course, from the famous uphill section of the Spa-Francorchamps circuit where Sebastian Vettel won the Belgian Grand Prix earlier this year, but Infiniti isn't telling us much more than that.

A look inside Infiniti's variable-compression engine

We're sympathetic to anyone who had trouble understanding what's going on with Infiniti's new variable-compression engine. While we got a full tech briefing on the novel VC-Turbo back in August, the visual aids were lacking. The cutaway engine Infiniti brought to the Paris show fixes all of that. You can thank the little green and pink lines on the cutaway for making the whole idea a little more clear. Click through the gallery to see two lines – one green and one pink – that represent the different strokes allowing for different compression ratios. Remember, the compression ratio is the amount of volume in the cylinder on intake compared to the amount at the end of the compression stroke. Leave more room at the end and you lower that ratio. The length of the stroke doesn't change with this system, but where it sits along the cylinder does. Hence those two lines. The variable compression ratio allows this new turbocharged engine to maximize fuel economy when the turbo isn't needed by raising the compression ratio. It will see its first use in the next Infiniti QX50 crossover, previewed by the QX Sport Inspiration concept that's also on display in Paris, and has performance targets of 268 horsepower and 288 pound-feet of torque. After, it will migrate to other Infiniti and Nissan vehicles, with transverse front-drive-based applications first in line. Eventually, it's likely to completely replace Nissan's corporate 3.5-liter V6. We'll be poking around the engine a little more in Paris today to try and get some more info. For now, enjoy those cutaway images and those friendly little lines. Featured Gallery Infiniti VC-Turbo engine cutaway View 14 Photos Paris Motor Show Infiniti Nissan Technology Emerging Technologies engine 2016 paris motor show