2012 NAIAS: Higher performance engines highlight 2013 Genesis Coupe refresh

  • 09-Jan-2012 03:00 EST
2013 Genesis Coupe.JPG

Hyundai's refreshed 2013 Genesis Coupe adds a new front fascia among other changes. But the engines are the real news.

A new direct-injected 3.8-L V6 and a revised 2.0-L turbocharged I4 elevate the 2013 Hyundai Genesis Coupe's performance while improving its efficiency. The car debuted at the 2012 North American International Auto Show.

The new V6, part of the automaker's Lambda engine family, carries over the cylinder block of the port-injected 3.8-L V6 it replaces with some minor changes. The GDI cylinder heads are new and feature side-mounted injectors, according to Nayan Engineer, Manager of Powertrain at the Hyundai America Technical Center in Superior Township, MI.

The new V6 is expected to give the Genesis Coupe a significant boost in performance. Horsepower is increased by approximately 42 hp (31 kW) and peak torque is up by approximately 29 lb-ft (39 N·m).

While Hyundai had not yet certified the engine ratings when this article went to press, output of the new V6 is an estimated 348 hp (259 kW) vs. 306 hp (228 kW) of the previous engine. Peak torque rating is expected to be 295 lb·ft (400 N·m) vs. the prior engine's 266 lb·ft (361 N·m) rating.

"By injecting fuel directly into the combustion chamber, there is an inherent charge-cooling effect with the GDI engine. This enables the use of a higher compression ratio—now at 11.5:1—which in turn leads to improved torque and power," Engineer told AEI.

Hyundai engineers in South Korea spent 15 months developing the Korean patent-pending control software, which marks its application debut on the GDI V6.

Explained Byoung soo Lim, Senior Research Engineer with Hyundai's Powertrain NVH team, "This technology is about reducing valve speed in the high-pressure fuel pump to reduce vibration and noise. It uses a fuel pressure sensor, which was already used on the fuel rail of the GDI system."

The engine's rpm level, vehicle speed, and signal from the accelerator pedal influence the valve speed in the high-pressure fuel pump.

"This (software control) logic is usually activated in low-speed and low-rpm conditions," noted Lim.

In addition to active NVH control, the new V6 uses passive sound suppressors, including a foam boot on top of the high-pressure fuel pump and a noise-absorbing foam jacket over the fuel rail assemblies on both cylinder banks. To minimize structure-borne noise from the aluminum block, each fuel injector has been fitted with an NVH-optimized rubber washer.

"We want to take sound out of the equation," Engineer asserted.

To reduce weight and friction, the surge tank, intake manifold, thermostat housing, and camshaft cover on the GDI V6 are made of thermoplastics. Those same parts were made of aluminum on the previous V6.

The standard six-speed manual transmission has been revised for more precise shift engagement while a new eight-speed automatic transmission with Shiftronic replaces a ZF-supplied six-speed automatic.

New twin-scroll turbo

Hyundai's turbocharged 2.0-L Theta inline-four also receives technical enhancements that raise its peak horsepower to an estimated 260 hp (194 kW) using regular-octane gasoline vs. the previous 210 hp (157 kW). Peak torque is increased to an estimated 260 lb·ft (352 N·m) compared to the previous engine's 223 lb·ft (302 N·m).

With premium fuel, the rated output increases to an estimated 275 hp (205 kW) and an estimated 275 lb·ft (373 N·m). (As with the V6, performance ratings were not finalized as this article was published.)

Key enablers for the I4's hp and torque gains are an entirely new twin-scroll turbocharger unit, an electronic waste gate actuator (which provides accurate turbo-boost vs. the previous vacuum-assisted actuator), manifold-integrated turbine housing (for reducing thermal mass of the boosting system), and a new intercooler.

"The intercooler is approximately 50% larger and is now positioned in front of the air-conditioning system's condenser. Its previous location was underneath the radiator," said Engineer.

In addition to the powertrain improvements, the 2013 Genesis Coupe showcases a revised front fascia, headlights, grille, and LED taillights. The interior changes include a new center console, audio and HVAC controls, as well as Blue Link telematics for navigation-equipped models.

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