|New 5.0L direct injection Tao V8. Click to enlarge.|
At the Chicago Auto Show, Hyundai announced new direct injection technology for its Lambda V6 engine, as well as the availability of a new 5.0L direct injection Tau V8 for the 2012 Genesis 5.0 R-Spec model, new in-house developed eight-speed automatic transmissions, and enhanced chassis tuning.
Lambda 3.8L V6. The addition of gasoline direct injection (GDI) technology to the Genesis 3.8-liter Lambda engine boosts its output 15% from 290 to 333 hp (216 to 248 kW), a gain of 43 hp with no increase in displacement. In addition, peak torque rises from 264 lb-ft to 291 lb-ft (358 to 395 N·m) from the same 3.8 liters. Compression ratio increases from 10.4:1 to 11.5:1 for greater thermal efficiency. This new direct-injected Lambda V6 produces a higher specific output (87.6 hp/liter) than its normally-aspirated premium luxury competitors, according to Hyundai.
The direct-injected 3.8-liter engine retains advanced engine technologies of its predecessor, including Dual Continuously Variable Valve Timing (D-CVVT), variable induction, all aluminum block and heads, steel timing chain, and iridium-tipped spark plugs. Direct injection technology also produces a significant reduction in emissions through a 40% reduction in catalyst light-off time. Further, a variable vane oil pump has been fitted to precisely match oil pressure with engine lubrication requirements for increased efficiency at all engine speeds. As a result, 3.8-liter GDI fuel economy increases over 7% percent from 27 mpg to 29 mpg on the highway.
All 3.8-liter engines will be coupled to an in-house-developed eight-speed transmission with SHIFTRONIC and precisely calibrated gear ratios for an overall transmission efficiency gain of 6%. These two additional ratios serve to achieve competing objectives of acceleration and economy without compromise.
5.0L Tau V8. The new Tau V8—the most powerful Hyundai automotive engine yet—produces 429 hp (320 kW) at 6,400 rpm and 376 lb-ft (510 N·m) of torque at 5,000 rpm. Specific output is 85.8 hp/L. The 5.0-liter cylinder bore was increased from 92 mm to 96 mm over the 4.6-liter bore for a total displacement of 5.0 liters (5,038cc). In addition to the enlarged displacement, direct injection technology has been added.
This high-pressure direct injection system (more than 2200 psi/152 bar), increases power and torque while reducing fuel consumption and emissions. Compression ratio has also been increased from 10.4 to 11.5:1 for greater thermal efficiency and output. The Tau also receives a revised bed plate for improved block rigidity and lower NVH as well as camshaft carriers and a roller timing chain to improve valvetrain stability.
The new V8 also offers Dual Continuously Variable Valve Timing (D-CVVT), a tuned variable induction system, and low-friction diamond-like coatings (DLC) on piston skirts, rings and tappets. Fuel economy for the 5.0L is estimated at 16 mpg city and 25 mpg highway, nearly matching the 4.6-liter V8 (17 mpg city/26 mpg highway). This same 5.0-liter Tau V8 with eight-speed transmission will replace the current 4.6-liter V8 as the standard powertrain in the 2012 Hyundai Equus premium luxury sedan, on sale this summer.
The Tau 5.0-liter V8 is coupled with a new in-house eight-speed transmission. This new Hyundai-developed transmission adds two additional ratios to enhance acceleration, shifting smoothness, and transmission efficiency by six percent over the former six-speed. All eight-speed transmissions will include SHIFTRONIC manual shift capability. This new eight-speed transmission is the first offered by a non-luxury branded manufacturer.