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Both the Quattroporte and the RLX 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, lane departure warning systems, blind spot warning systems, rearview cameras and rear cross-path warning.
A hardened steel chain, with no maintenance needs, drives the camshafts in the Quattroporte’s engine. A rubber cam drive belt that needs periodic replacement drives the RLX’s camshafts. If the RLX’s belt breaks, the engine could be severely damaged when the pistons hit the opened valves.
The Quattroporte S’ standard 3.0 turbo V6 produces 114 more horsepower (424 vs. 310) and 156 lbs.-ft. more torque (428 vs. 272) than the RLX’s standard 3.5 SOHC V6. The Quattroporte S’ 3.0 turbo V6 produces 47 more horsepower (424 vs. 377) and 87 lbs.-ft. more torque (428 vs. 341) than the RLX Sport Hybrid’s standard 3.5 SOHC V6 hybrid. The Quattroporte GTS’ standard 3.8 turbo V8 produces 146 more horsepower (523 vs. 377) and 183 lbs.-ft. more torque (524 vs. 341) than the RLX Sport Hybrid’s standard 3.5 SOHC V6 hybrid.
Regardless of its engine, the Quattroporte’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.) Acura only offers an automatic engine start/stop system on the RLX Sport Hybrid.
The Quattroporte has 5.9 gallons more fuel capacity than the RLX Sport Hybrid’s standard fuel tank (21 vs. 15.1 gallons), for longer range between fill-ups. The Quattroporte has 2.5 gallons more fuel capacity than the RLX’s standard fuel tank (21 vs. 18.5 gallons).
For better stopping power the Quattroporte’s brake rotors are larger than those on the RLX:
RLX Sport Hybrid
The Quattroporte’s standard front and rear disc brakes are vented to help dissipate heat for shorter stops with less fading. The rear discs on the RLX are solid, not vented.
For better traction and acceleration, the Quattroporte has larger standard rear tires than the RLX (275/40R19 vs. 245/40R19). The Quattroporte’s optional rear tires are larger than the largest rear tires available on the RLX (285/35R20 vs. 245/40R19).
The Quattroporte’s optional 245/35R21 front and 285/30R21 rear tires provide better handling because they have a lower 35 series front and 30 series rear profile (height to width ratio) that provides a stiffer sidewall than the RLX’s 40 series tires.
For better ride, handling and brake cooling the Quattroporte offers optional 21-inch wheels. The RLX’s largest wheels are only 19-inches.
The Quattroporte 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 RLX; it requires you to depend on roadside assistance and your vehicle will have to be towed.
The Quattroporte has a standard driver-adjustable suspension system. It allows the driver to choose between an extra-supple ride, reducing fatigue on long trips, or a sport setting, which allows maximum control for tricky roads. The RLX’s suspension doesn’t offer adjustable shock absorbers.
The Quattroporte’s drift compensation steering can automatically compensate for road conditions which would cause the vehicle to drift from side to side, helping the driver to keep the vehicle straight more easily. The RLX doesn’t offer drift compensation steering.
For a smoother ride and more stable handling, the Quattroporte’s wheelbase is 12.6 inches longer than on the RLX (124.8 inches vs. 112.2 inches).
The Quattroporte’s front to rear weight distribution is more even (50% to 50%) than the RLX’s (57% to 43%). This gives the Quattroporte more stable handling and braking.
For better maneuverability, the Quattroporte’s turning circle is 1.8 feet tighter than the RLX’s (38.7 feet vs. 40.5 feet).
The front grille of the Quattroporte uses electronically controlled shutters to close off airflow and reduce drag when less engine cooling is needed. This helps improve highway fuel economy. The RLX doesn’t offer active grille shutters.
Because it has more passenger and cargo room, the EPA rates the Quattroporte a Large car, while the RLX is rated a Mid-size.
The Quattroporte has 11.9 cubic feet more passenger volume than the RLX (114 vs. 102.1).
The Quattroporte has 1 inch more front headroom, 8.9 inches more front hip room, 4.7 inches more front shoulder room, .9 inches more rear headroom and 3.3 inches more rear hip room than the RLX.
For enhanced passenger comfort on long trips the Quattroporte’s available rear seats recline. The RLX’s rear seats don’t recline.
The Quattroporte has a much larger trunk than the RLX (18.7 vs. 14.9 cubic feet).
The Quattroporte’s standard rear seats fold to accommodate long and bulky cargo. The RLX 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 Quattroporte’s power trunk can be opened or closed just by kicking your foot under the back bumper, leaving your hands completely free. The RLX doesn’t offer a power or hands-free opening trunk.
The engine in the Quattroporte is mounted longitudinally (North-South), instead of sideways, as in the RLX. This makes it easier to service and maintain, because there are no rear spark plugs and the accessory belts are in front.
The Quattroporte’s instruments include an oil pressure gauge and a temperature gauge - which could save your engine! Often ‘idiot lights’ don’t warn you until damage has been done. The RLX does not have an oil pressure gauge.
The power windows standard on both the Quattroporte and the RLX have locks to prevent small children from operating them. When the lock on the Quattroporte is engaged the driver can still operate all of the windows, for instance to close one opened by a child. The RLX prevents the driver from operating the other windows just as it does the other passengers.
Heated windshield washer nozzles are standard on the Quattroporte to prevent washer fluid and nozzles from freezing and help continue to keep the windshield clear in sub-freezing temperatures. The RLX doesn’t offer heated windshield washer nozzles.
In poor weather, headlights can lose their effectiveness as grime builds up on their lenses. This can reduce visibility without the driver realizing. The Quattroporte has standard headlight washers to keep headlight output high. The RLX doesn’t offer headlight washers.
To help drivers see further while navigating curves, the Quattroporte has standard adaptive headlights to illuminate around corners automatically by reading vehicle speed and steering wheel angle. The RLX doesn’t offer cornering lights.
Optional air conditioned front and rear seats keep the Quattroporte’s passengers comfortable and take the sting out of hot leather in summer. The RLX doesn’t offer air-conditioned seats in the rear.
The Quattroporte 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 is only available on the RLX Sport Hybrid.
The Quattroporte offers an optional 115-volt a/c outlet on the center console, allowing you to recharge a laptop or run small household appliances without special adapters that can break or get misplaced. The RLX doesn’t offer a house-current electrical outlet.
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