Much like its sister car, the Sonata Hybrid, the Optima Hybrid uses the same 2.4-liter direct-injected inline-four, coupled to an electric motor. The car doesn't use a nickel-metal hydride or lithium-ion battery, instead opting for a more advanced lithium-polymer one, developed specially for it. The battery is capable of holding a larger charge (30 kW) for up to 25% more time. The new pack is also lighter, weighing in at just 95.9 lbs (43 kg).
The electric motor alone delivers 40 hp (30 kW) and 151 lb-ft (205 Nm) of torque, bringing the total output to 206 hp and 195 lb-ft (264 Nm) when combined with the 2.4-liter Atkinson Cycle petrol engine. The car can be driven on the electric engine alone at speeds of up to 62 mph (100 km/h), according to the manufacturer.
Another unique component is the Hybrid-Starter-Generator (HSG). This 8.5 kilowatt starter motor-generator is belt-driven and operates at the same 270 volts as the electric traction motor and the lithium polymer battery, but does not provide power. Instead, it is used only to start the engine and then to charge the hybrid battery.
"By adding our first-ever hybrid in the U.S. to the Optima lineup we are providing consumers with three powerful and fuel-efficient powertrain choices, and continuing KIA's philosophy of offering stylish, value-packed vehicles with outstanding fuel efficiency," said Michael Sprague, vice president, marketing & communications, Kia Motors America.
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