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The Stinger has standard Active Headrests, which use a specially designed headrest to protect the driver and front passenger from whiplash. During a rear-end collision, the Active Headrests system moves the headrests forward to prevent neck and spine injuries. The Q50 doesn’t offer a whiplash protection system.
The Stinger GT1/GT2’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 Stinger 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, daytime running lights, rearview cameras, available all wheel drive, crash mitigating brakes, lane departure warning systems and around view monitors.
For its top level performance in IIHS driver and passenger-side small overlap frontal, moderate overlap frontal, side impact, roof strength and head restraint tests, with its optional vehicle-to-vehicle front crash prevention system, with its optional vehicle-to-pedestrian front crash prevention system, and its available headlight’s “Good” rating, the Insurance Institute for Highway Safety grants the Stinger the rating of “Top Pick” for 2020, a rating granted to only 30 vehicles tested by the IIHS. The Q50 has not been fully tested, yet.
The Stinger 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 Stinger 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 Stinger’s warranty.
The battery on the Stinger is in the trunk, which protects it from hot underhood temperatures that can degrade battery life. By keeping the Stinger’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 rated the Stinger third among compact premium cars in their 2019 Initial Quality Study. The Q50 isn’t in the top three in its category.
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 Stinger GT’s standard 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.
As tested in Car and Driver the Stinger GT 3.3 turbo V6 is faster than the Q50 Red Sport 400:
Zero to 60 MPH
Regardless of its engine, the Stinger’s engine automatically turns off when the vehicle is stopped, saving fuel and reducing pollution. (Start/Stop isn’t accounted in present EPA fuel mileage tests.) Infiniti only offers an automatic engine start/stop system on the Q50 2.0t.
To lower fuel costs and make buying fuel easier, the Kia Stinger 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 Stinger, for better acceleration and lower engine speed on the highway. Only a seven-speed automatic is available for the Q50.
The Stinger GT/GT1/GT2’s launch control uses engine electronics to hold engine RPM’s at 2250 in order to provide the most stable and rapid acceleration possible, using all of the available traction. The Q50 doesn’t offer launch control.
The Stinger stops shorter than the Q50:
70 to 0 MPH
Car and Driver
The Stinger GT-Line’s standard tires provide better handling because they have a lower 45 series 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 Stinger GT-Line has standard 18-inch wheels. Smaller 17-inch wheels are standard on the Q50.
The Stinger 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.
The Stinger has standard front and rear gas-charged shocks for better control over choppy roads. The Q50’s suspension doesn’t offer gas-charged shocks.
For a smoother ride and more stable handling, the Stinger’s wheelbase is 2.2 inches longer than on the Q50 (114.4 inches vs. 112.2 inches).
For better handling and stability, the average track (width between the wheels) on the Stinger is 2.2 inches wider in the front and 2.7 inches wider in the rear than the average track on the Q50.
The Stinger’s front to rear weight distribution is more even (51.9% to 48.1%) than the Q50’s (55.8% to 44.2%). This gives the Stinger more stable handling and braking.
The Stinger GT2 handles at .93 G’s, while the Q50 Red Sport 400 pulls only .88 G’s of cornering force in a Car and Driver skidpad test.
The Stinger has 2.3 inches more front hip room, 1.3 inches more rear legroom and 3.6 inches more rear hip room than the Q50.
The Stinger’s standard rear seats fold to accommodate long and bulky cargo. The Q50 Pure doesn’t offer folding rear seats, only a ski pass-through.
To make loading and unloading groceries and cargo easier when your hands are full, the Stinger GT2’s power trunk can be opened just by waiting momentarily behind the back bumper, leaving your hands completely free. The Stinger’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.
The Stinger has a maintenance free battery for long life without checking the battery’s water level. The Q50 doesn’t have a maintenance free battery, so the water level in the battery’s cells must be checked often to prevent damage.
The Stinger GT2 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 power windows standard on both the Stinger and the Q50 have locks to prevent small children from operating them. When the lock on the Stinger 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.
The Insurance Institute for Highway Safety (IIHS) conducts detailed tests on headlights for their range both straight ahead and in curves and to be certain they don’t exceed acceptable amounts of glare to oncoming drivers. The Stinger’s available headlights were rated “Good” by the IIHS, while the Q50’s headlights are rated “Acceptable” to “Marginal.”
The Stinger has standard heated front seats. Heated front seats cost extra on the Q50, and aren’t available on the Q50 Pure. The Stinger GT2 also has standard heated rear seats to keep those passengers extremely comfortable in the winter. Heated rear seats aren’t available in the Q50.
Standard air-conditioned seats in the Stinger GT1/GT2 keep the driver and front passenger comfortable and take the sting out of hot seats in Summer. The Q50 doesn’t offer air-conditioned seats.
To quickly and conveniently keep personal devices charged without cables tangling and wearing out, the Kia Stinger has a standard wireless phone charging system (Qi) in the center console. The Q50 doesn’t offer wireless personal charging.
Insurance will cost less for the Stinger owner. The Complete Car Cost Guide estimates that insurance for the Stinger will cost $810 less than the Q50 over a five-year period.
J.D. Power and Associates rated the Stinger third among compact premium cars in owner reported satisfaction. This includes how well the vehicle performs and satisfies its owner’s expectations. The Q50 isn’t in the top three.
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