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To provide maximum traction and stability on all roads, All-Wheel Drive is standard on the K900. But it costs extra on the Q50.
The K900’s driver alert monitor detects an inattentive driver then sounds a warning and suggests a break. According to the NHTSA, drivers who fall asleep cause about 100,000 crashes and 1500 deaths a year. The Q50 doesn’t offer a driver alert monitor.
Both the K900 and the Q50 have standard driver and passenger frontal airbags, front side-impact airbags, side-impact head airbags, front seatbelt pretensioners, height adjustable front shoulder belts, four-wheel antilock brakes, traction control, electronic stability systems to prevent skidding, crash mitigating brakes, daytime running lights and rearview cameras.
The Kia K900 weighs 664 to 977 pounds more than the Infiniti Q50. The NHTSA advises that heavier cars are much safer in collisions than their significantly lighter counterparts.
The K900 comes with a full 5-year/60,000-mile basic warranty, which covers the entire car and includes 24-hour roadside assistance. The Q50’s 4-year/60,000-mile basic warranty expires 1 year sooner.
Kia’s powertrain warranty covers the K900 4 years and 30,000 miles longer than Infiniti covers the Q50. Any repair needed on the engine, transmission, axles, joints or driveshafts is fully covered for 10 years or 100,000 miles. Coverage on the Q50 ends after only 6 years or 70,000 miles.
There are almost 4 times as many Kia dealers as there are Infiniti dealers, which makes it much easier should you ever need service under the K900’s warranty.
The battery on the K900 is in the trunk, which protects it from hot underhood temperatures that can degrade battery life. By keeping the K900’s battery 20 to 30 degrees cooler, its life is increased by years. The Q50’s battery is in the hot engine compartment.
J.D. Power and Associates’ 2019 Initial Quality Study of new car owners surveyed provide the statistics that show that Kia vehicles are better in initial quality than Infiniti vehicles. J.D. Power ranks Kia second in initial quality, above the industry average. With 31 more problems per 100 vehicles, Infiniti is ranked 19th, below the industry average.
J.D. Power and Associates’ 2019 survey of the owners of three-year-old vehicles provides the long-term dependability statistics that show that Kia vehicles are more reliable than Infiniti vehicles. J.D. Power ranks Kia 10th in reliability, above the industry average. With 2 more problems per 100 vehicles, Infiniti is ranked 11th.
From surveys of all its subscribers, Consumer Reports’ December 2019 Auto Issue reports that Kia vehicles are more reliable than Infiniti vehicles. Consumer Reports ranks Kia 4 places higher in reliability than Infiniti.
The K900’s 3.3 turbo V6 produces 65 more horsepower (365 vs. 300) and 81 lbs.-ft. more torque (376 vs. 295) than the Q50 3.0t’s standard 3.0 turbo V6. The K900’s 3.3 turbo V6 produces 26 lbs.-ft. more torque (376 vs. 350) than the Q50 Red Sport 400’s standard 3.0 turbo V6.
To lower fuel costs and make buying fuel easier, the Kia K900 uses regular unleaded gasoline (premium recommended for maximum performance). The Q50 requires premium, which can cost 20 to 55 cents more per gallon.
An eight-speed automatic is standard on the Kia K900, for better acceleration and lower engine speed on the highway. Only a seven-speed automatic is available for the Q50.
For better stopping power the K900’s brake rotors are larger than those on the Q50:
Q50 Sport/Red Sport 400
For better traction, the K900 has larger tires than the Q50 (F:245/45R19 & R:275/40R19 vs. 225/55R17).
The K900’s 245/45R19 front and 275/40R19 rear tires provide better handling because they have a lower 45 series front and 40 series rear profile (height to width ratio) that provides a stiffer sidewall than the Q50’s standard 55 series tires.
For better ride, handling and brake cooling the K900 has standard 19-inch wheels. Smaller 17-inch wheels are standard on the Q50.
The K900 has a standard space-saver spare tire so you can replace a flat tire and drive to have the flat repaired or replaced. A spare tire isn’t available on the Q50, it requires you to depend on its run-flat tires, which limits mileage and speed before they are repaired. If a run-flat is damaged beyond repair by a road hazard your vehicle will have to be towed.
For a smoother ride and more stable handling, the K900’s wheelbase is 10 inches longer than on the Q50 (122.2 inches vs. 112.2 inches).
For better handling and stability, the track (width between the wheels) on the K900 is 3.9 inches wider in the front and 3 inches wider in the rear than the average track on the Q50.
The front grille of the K900 uses electronically controlled shutters to close off airflow and reduce drag when less engine cooling is needed. This helps improve highway fuel economy. The Q50 doesn’t offer active grille shutters.
Because it has more passenger and cargo room, the EPA rates the K900 a Large car, while the Q50 is rated a Mid-size.
The K900 has 8.5 cubic feet more passenger volume than the Q50 (110 vs. 101.5).
The K900 has .9 inches more front headroom, 1.2 inches more front legroom, 2.3 inches more front shoulder room, .5 inches more rear headroom, 1.5 inches more rear legroom and 1.1 inches more rear shoulder room than the Q50.
For enhanced passenger comfort on long trips the K900’s available rear seats recline. The Q50’s rear seats don’t recline.
The K900 has a much larger trunk than the Q50 (15 vs. 13.5 cubic feet).
To make loading and unloading groceries and cargo easier when your hands are full, the K900’s power trunk can be opened just by waiting momentarily behind the back bumper, leaving your hands completely free. The K900’s power trunk can also be opened or closed by pressing a button. The Q50 doesn’t offer a power or hands-free opening trunk.
Unlike the driver-only memory system in the Q50 Sport/Red Sport 400, the K900 has standard driver and passenger memory, so that when drivers switch, the memory setting adjusts the driver’s seat, steering wheel position and outside mirror angle and the front passenger seat also adjusts to the new passenger’s preset preferences.
The K900 has a standard heads-up display that projects speed and other key instrumentation readouts in front of the driver’s line of sight, allowing drivers to view information without diverting their eyes from the road. The Q50 doesn’t offer a heads-up display.
The K900’s power parking brake sets with one touch and releases with one touch or automatically. The Q50’s parking brake has to released manually.
The power windows standard on both the K900 and the Q50 have locks to prevent small children from operating them. When the lock on the K900 is engaged the driver can still operate all of the windows, for instance to close one opened by a child. The Q50 prevents the driver from operating the other windows just as it does the other passengers.
A power rear sunshade and manual rear side window sunshades are standard in the K900 to help block heat and glare for the rear passengers. The Q50 doesn’t offer a rear or rear side window sunshades.
The K900 has standard heated front seats. Heated front seats cost extra on the Q50, and aren’t available on the Q50 Pure. The K900 also has standard heated rear seats to keep those passengers extremely comfortable in the winter. Heated rear seats aren’t available in the Q50.
The K900 has standard front air conditioned seats and offers them optionally in the rear. This keeps the passengers comfortable and takes the sting out of hot seats in summer. The Q50 doesn’t offer air-conditioned seats.
The K900 has a standard heated steering wheel to take the chill out of steering on extremely cold winter days before the car heater warms up. A heated steering wheel costs extra on the Q50.
To quickly and conveniently keep personal devices charged without cables tangling and wearing out, the Kia K900 has a standard wireless phone charging system (Qi) in the center console and for the rear passengers. The Q50 doesn’t offer wireless personal charging.
© 1991-2018 Advanta-STAR Automotive Research. All rights reserved.
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