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2011 Hyundai Sonata 2.0T

The Korean company debuted the 2011 Hyundai Sonata 2.0T version at this year's 2010 New York Auto Show.

The 2011 Hyundai Sonata 2.0T features a 2.0-litre Theta II turbo engine with GDI (gasoline direct injection) that is capable of producing 274 HP and 269 lb-ft of torque from 1,800 to 4,500 rpm.

With this considerable power level the 2011 Hyundai Sonata 2.0T which will be available in SE and Limited trim levels is still able to return an estimated 34 mpg highway and 22 mpgcity.

On the 2011 Hyundai Sonata 2.0T Limited customers get a panoramic roof, 18 inch silver alloys, a dual exhaust system and paddle shifters for the 6-speed automatic transmission.

The 2011 Hyundai Sonata 2.0T was not announced yet.

Hyundai press release :

NEW YORK, march 31, 2010 – Hyundai Motor America debuted its2.0-liter Theta II turbocharged gasoline direct-injection (GDI) enginein the 2011 Sonata at the New York Auto Show today. With the additionof the all-new 2.0-liter Theta II turbocharged GDI engine, the new 2011Sonata offers an unprecedented combination of segment-leading fuelefficiency and power – with an estimated 34 mpg highway rating, and 274horsepower. Remarkably, the Sonata 2.0T produces these industry-leadingmetrics on regular fuel...premium fuel is not required.

The new Sonata is the first Hyundai vehicle to have both GDI technologyand a turbocharger. By the end of Hyundai's 24/7 version 2.0 productinitiative (seven new models in the next 24 months), four nameplateswill be available with GDI or the combination of GDI
and aturbocharger. Turbocharging and GDI are part of "Hyundai Blue Drive,"the company's environmental initiative to continue industry leadershipin fuel efficiency and sustainability.

"The Sonata 2.0T is a great example of what our Blue Drive productstrategy is doing for consumers," said John Krafcik, Hyundai MotorAmerica president and CEO. "Think about it – more horsepower than anyof our V6 competitors, with better gas mileage than any competitive4-cylinder model. We're not fans of compromising at Hyundai, and theSonata really demonstrates this aspect of our business approach."

The 2.0-liter turbocharged GDI four-cylinder engine in the 2011 Sonataproduces 274 horsepower at 6,000 rpm and 269 lb-ft of torque from1800-4500 rpm with regular fuel. The Sonata 2.0T will deliver 22 mpgcity and 34 mpg highway (preliminary estimates). Hyundai's turbochargedengine features a twin-scroll turbocharger that when combined with theGDI system results in instantaneous power delivery. Twin-scrollturbochargers have traditionally been used on more expensive highperformance engines, but as with GDI, Hyundai has chosen once again toapply this efficient technology in high volume to its most popularmodel.

The 2.0T engine will be available on the SE and Limited trim level,with the 2.0T Limited getting additional upgrades, including:
  • Panoramic sunroof
  • 18-inch hyper silver alloy wheels
  • Dual exhaust system
  • Steering wheel-mounted paddle shifters
TWIN-SCROLL TURBOCHARGER AND GDI TECHNOLOGY

Twin-scroll turbocharger designs have two exhaust gas inlets divided bysplit walls inside the turbine housing, with both gas passagescontrolled by a waste-gate. A twin-scroll turbo recovers even moreenergy from the exhaust than a single-scroll turbocharger thanks to adivided manifold. The twin-scroll design separates the cylinders whoseexhaust gas pulses interfere with each other resulting in improvedpressure distribution in the exhaust ports and a more efficientdelivery of exhaust gas energy to the turbocharger's turbine.

For example, at the start of the intake stroke of cylinder one, andwhen both the intake and exhaust valves of cylinder one are open (valveoverlap period), cylinder three already starts its exhaust stroke withthe exhaust valve open. If the exhaust passages of cylinder one andthree were connected, the exhaust gas pulse from cylinder three wouldincrease the back pressure of cylinder one. This would reduce theinduction of the fresh air and increase the amount of hot residualgases inside the cylinder. However, with the twin-scroll turbochargersetup, this interference is minimized.

The result of this superior scavenging effect from a twin-scroll designleads to better pressure distribution in the exhaust ports and a moreefficient delivery of exhaust gas energy to the turbocharger's turbine.This in turn allows greater valve overlap, resulting in an improvedquality and quantity of the air charge entering each cylinder. In fact,with more valve overlap, the scavenging effect of the exhaust flow canliterally draw more air in on the intake side. At the same time,drawing out the last of the low-pressure exhaust gases help pack eachcylinder with a denser and purer air charge. Maximum boost from theturbocharger is 17.4 psi.

The twin-scroll turbocharger design has several other advantages overtraditional, single-scroll turbocharging systems, including:
  • Improved combustion efficiency
  • Low engine-speed efficiency
  • Kinetic exhaust gas energy is not wasted or trapped
  • Cooler cylinder temperatures
  • Lower exhaust temperatures
  • Leaner air/fuel ratio
* Better pressure distribution in the exhaust ports and more efficientdelivery of exhaust gas energy to the turbocharger's turbine

Essentially, Sonata's twin-scroll turbo directs even more air into theengine while a compressor increases the pressure entering the cylinder.This allows the air entering the cylinder to be even more denselypacked for higher compression and better performance, contributing to amore-efficient burn and fuel efficiency.

Two key features of Hyundai's twin-scroll turbocharger setup are:

* The stainless steel exhaust manifold and the twin-scroll turbine housing are cast in a patent pending one-piece design
* The waste-gate for the turbocharger uses a motor-driven electrical controller instead of being mechanically controlled

Thanks to the integrated stainless-steel turbine housing with theexhaust manifold, not only is the weight and cost of the castingdramatically reduced, the durability of the turbine housing is alsoimproved.

By adapting the motor-driven electrical waste-gate, the boost pressureis precisely controlled. The back pressure is reduced when turbo boostis not necessary by opening the waste-gate, which improves fuelefficiency. In addition, during cold starts, the waste-gate remainsopen which results in faster catalyst light-off for reduced exhaustemissions.

A GDI fuel delivery system contributes to improved fuel efficiency andlower emissions. This shorter, more direct path of fuel delivery allowsfor greater control of the fuel mixture at the optimum moment, thusimproving efficiency. The fuel is injected by a camshaft-driven, highpressure pump that operates at pressures up to 2175 psi. Directinjection also utilizes a higher-than-normal 9.5:1 compression ratiowhile achieving a remarkable 137 horsepower-per-liter. The piston headsare "dished" to increase combustion efficiency in the cylinder.

WORLD-CLASS POWER-TO-WEIGHT RATIO, RIGIDITY AND SPACE

One of the program targets for the 2011 Sonata engineering team wasworld-class power-to-weight ratio. This philosophy was also applied tothe Sonata 2.0T, with the result of a best-in-class power-to-weightratio of 12.2 horsepower per pound, significantly better than anymid-size sedan competitor, and even better than the performance-focusedChevrolet Camaro V6. Power-to-weight ratio pays dividends in bothperformance and fuel economy, and is the key to Sonata's superiorperformance in both of these areas.

Additionally, all Sonatas are rich in ultra-high-strength steel,leading to world-class body rigidity. The 2011 Sonata is 25 percentstiffer in torsion and 19 percent stiffer in bending rigidity than itspredecessor, yet it is lighter than most midsize sedans, also offeringmore interior room.

SIX-SPEED AUTOMATIC TRANSMISSION

Hyundai's commitment to making the Sonata 2.0T extremely fuel efficientcontinues with a six-speed automatic transmission with SHIFTRONICmanual control.

Hyundai's all-new six-speed automatic A6LF2 transaxle is another waythe company is meeting its goals of improving fuel efficiency andreducing emissions. Shifts are silky smooth with an option of manualcontrol through the SHIFTRONIC feature.

Drivers can access the SHIFTRONIC feature by moving the gear selectorinto a separate gate. Pushing the selector forward or pulling itrearward will shift the transmission up or down sequentially, adding todriver control. Turbocharged Sonatas will also feature steeringwheel-mounted paddle shifters. A clear LCD readout on the instrumentpanel shows the gear being used.

Designed for transverse engine applications in passenger cars and SUVs,the new compact transmission puts Hyundai into an elite class of automanufacturers who have designed their own proprietary six-speedautomatic transmissions. The strength of the design is its uniquelayout which makes it smaller, more compact and lighter than any othersix-speed transmission on the market today.

For the customer, the new six-speed delivers a performance edge. Thegearbox has no dipstick because it is filled with automatictransmission fluid that is good for the life of the vehicle undernormal usage conditions, thereby reducing maintenance costs.

Developed over a four-year period, this new six-speed automatic is 26.4pounds lighter than the five-speed it replaces. It is also 1.6 inchesshorter and considerably simpler, having 62 fewer parts, which is keyto increased durability, lighter weight and lower cost.

When it comes to transmissions, more gears are definitely better. Theaddition of a sixth gear enables closer spacing between gear ratiosproviding a better balance of performance and fuel economy while thewide overall gear ratio helps deliver strong acceleration.

The gearbox has three planetary gearsets and a unique flat torqueconverter that shortens the unit's overall length by 0.47 inches. Fourpinion differentials improve durability and further minimize size.

Another example of engineering ingenuity is found in the design of thehydraulic pressure control unit. Slight manufacturing deviations fromone solenoid valve to the next often cause fluctuation in the hydraulicpressure and affect shift precision and quality. The transmissionfeatured in the Sonata cleverly integrates adjustment screws in thevalves that enable each of the eight valves to be calibrated at thefactory. This feature ensures stable hydraulic pressure at any shiftpoint which facilitates a high degree of precision and control neededto deliver fast, smooth and precise shifts throughout the rpm range.

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