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New power plant for 2016 Infiniti Q50s

POSTED BY Nigel Andretti ON 21 December 2015

INFINITI has developed a lightweight 400hp 3.0-litre V6 twin-turbo engine to stuff into the new 2016 Infiniti Q50 to premiere at the North American International Auto Show in January.

Key engine features include compact aluminum-alloy engine block and cylinder heads; Gasoline Direct Injection (DIG) system; optimised turbine blade design; turbine speed sensor; electronic wastegate actuator; water-cooled engine charging; e-motor valve timing control; and an integrated exhaust manifold.

A 300-horsepower version will be available across the Q50 lineup in late spring. The new VR-series engine family replaces the award-winning Infiniti 3.7-litre VQ-series V6.

The third new powerplant for the 2016 Q50 is a 208-horsepower 2.0-litre turbo inline 4-cylinder engine developed in conjunction with Daimler and produced at Infiniti’s new engine facility in Decherd, Tenn.

Also available in late winter 2016 is the Q50 Hybrid, featuring a 3.5-litre gasoline-electric hybrid system with a net 360 horsepower rating. The hybrid powertrain is unchanged.

The all-new 3.0-liter V6 twin-turbo engine was developed to deliver optimal power and torque, alongside greater fuel efficiency. The high-output version of the power unit delivers 475 N·m maximum torque at 1,600-5,200 rpm. The standard output version produces 400 N·m torque at 1,600-5,200 rpm.

While the 300 hp version is fitted with a single intercooler pump, the 400 hp engine uses two for more effective management of heat when under operating at higher loads. In addition, for the 400 hp variant an optical turbo speed sensor gives a 30 percent power boost to the turbo system by allowing the blades to spin faster.

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These outputs have been achieved while ensuring an expected improvement in fuel efficiency of up to 6.7 percent, representing a high power-to-efficiency ratio for the 400 hp power unit. This power-to-efficiency performance was made possible thanks to a combination of newly developed powertrain features.

An advanced new twin-turbo system contributes to the smooth and immediate power delivery while promoting gains in efficiency. The combination of a new turbine speed sensor and an optimised turbine blade design realize greater performance with more immediate response.

Engineers have developed a water-cooled intercooler system to further improve performance and efficiency. The system rapidly cools air as it enters the twin-turbo system, reducing turbo lag and allowing for more immediate acceleration. The secondary result is a cooling system which is more compact—meaning a shorter flow path for air entering the turbocharger to enable quicker engine responses.

Advanced valve timing control incorporating a new electric motor mounted to the valve timing system delivers quicker reactions to driver inputs. Along with improved response, more immediate valve timing also helps the engine operate more efficiently, precisely controlling fuel and air quantities entering the combustion chamber.

The high-pressure direct injection gasoline (DIG) system, introduced for the first time, allows for precise control of fuel injection into the combustion chamber depending on throttle position and current engine speed. DIG contributes significantly to making the new engine the cleanest and most efficient V6 that Infiniti has ever offered.

The core structure of the 3.0-litre V6 twin-turbo engine weighs 194.8 kg, 14.1 kg less than the engine it replaces. The new turbocharger and advanced intercooler (or CAC) system componentry adds just an extra 25.8 kg for 220.6 kg in total.

The all-new 3.0-liter twin-turbo V6 engine is due to enter production during 2016 and will be manufactured at the powertrain plant in Iwaki, Fukushima, Japan.

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