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Both the Cullinan and MDX have child safety locks to prevent children from opening the rear doors. The Cullinan has power child safety locks, allowing the driver to activate and deactivate them from the driver's seat and to know when they're engaged. The MDX’s child locks have to be individually engaged at each rear door with a manual switch. The driver can’t know the status of the locks without opening the doors and checking them.
The Cullinan has standard PostCrash iBrake, which automatically apply the brakes in the event of a crash to help prevent secondary collisions and prevent further injuries. The MDX doesn’t offer a post collision braking system: in the event of a collision that triggers the airbags, more collisions are possible without the protection of airbags that may have already deployed.
Over 200 people are killed each year when backed over by motor vehicles. The Cullinan has standard Active Park Distance Control that uses rear sensors to monitor and automatically apply the brakes to prevent a rear collision. The MDX doesn’t offer backup collision prevention brakes.
To provide maximum traction and stability on all roads, All-Wheel Drive is standard on the Cullinan. But it costs extra on the MDX.
A passive infrared night vision system optional on the Cullinan helps the driver to more easily detect people, animals or other objects in front of the vehicle at night. Using an infrared camera to detect heat, the system then displays the image on a monitor in the dashboard. The MDX doesn’t offer a night vision system.
The Cullinan’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 MDX doesn’t offer a driver alert monitor.
Both the Cullinan and the MDX have standard driver and passenger frontal airbags, front side-impact airbags, driver knee airbags, side-impact head airbags, four-wheel antilock brakes, traction control, electronic stability systems to prevent skidding, crash mitigating brakes, daytime running lights, lane departure warning systems and rearview cameras.
The Rolls-Royce Cullinan weighs 1583 to 2037 pounds more than the Acura MDX. The NHTSA advises that heavier vehicles are much safer in collisions than their significantly lighter counterparts.
The Cullinan comes with a full 4-year/unlimited-mile basic warranty, which covers the entire truck and includes 24-hour roadside assistance. The MDX’s 4-year/50,000-mile basic warranty expires sooner.
Rolls-Royce pays for scheduled maintenance on the Cullinan for 4 years and unlimited miles. Rolls-Royce will pay for oil changes, lubrication and any other required maintenance. Acura doesn’t pay scheduled maintenance for the MDX.
A hardened steel chain, with no maintenance needs, drives the camshafts in the Cullinan’s engine. A rubber cam drive belt that needs periodic replacement drives the MDX’s camshafts. If the MDX’s belt breaks, the engine could be severely damaged when the pistons hit the opened valves.
The Cullinan’s standard 6.8 turbo V12 produces 273 more horsepower (563 vs. 290) and 360 lbs.-ft. more torque (627 vs. 267) than the MDX’s standard 3.5 SOHC V6. The Cullinan’s 6.8 turbo V12 produces 242 more horsepower (563 vs. 321) and 338 lbs.-ft. more torque (627 vs. 289) than the MDX Sport Hybrid’s standard 3.0 SOHC V6 hybrid. The Cullinan Black Badge’s standard 6.8 turbo V12 produces 271 more horsepower (592 vs. 321) and 375 lbs.-ft. more torque (664 vs. 289) than the MDX Sport Hybrid’s standard 3.0 SOHC V6 hybrid.
For better traction, the Cullinan has larger tires than the MDX (255/50R21 vs. 245/60R18).
The Cullinan’s standard tires provide better handling because they have a lower 50 series profile (height to width ratio) that provides a stiffer sidewall than the MDX’s standard 60 series tires.
For better ride, handling and brake cooling the Cullinan has standard 21-inch wheels. Smaller 18-inch wheels are standard on the MDX. The Cullinan’s optional 22-inch wheels are larger than the 20-inch wheels optional on the MDX.
Changing a flat tire near traffic can be dangerous and inconvenient. The run-flat tires standard on the Cullinan can be driven up to 50 miles without any air pressure, allowing you to drive to a service station for a repair. The MDX doesn’t offer run-flat tires.
The Cullinan has active sway bars, which help keep it flat and controlled during cornering, but disconnect at lower speeds to smooth the ride and offer greater off-road suspension articulation. This helps keep the tires glued to the road on-road and off. The MDX doesn’t offer an active sway bar system.
The front and rear suspension of the Cullinan uses air springs for a smoother, controlled ride than the MDX, which uses coil springs. Air springs maintain proper ride height and ride more smoothly.
The Cullinan offers an available adjustable active suspension system, which counteracts cornering forces actively, limiting body roll and improving handling and stability. Acura doesn’t offer an active suspension on the MDX.
The Cullinan has a standard automatic front and rear load leveling suspension to keep ride height level with a heavy load or when towing. The Cullinan’s height leveling suspension allows the driver to raise ride height for better off-road clearance and then lower it again for easier entering and exiting and better on-road handling. The MDX doesn’t offer a load leveling suspension.
For a smoother ride and more stable handling, the Cullinan’s wheelbase is 18.7 inches longer than on the MDX (129.7 inches vs. 111 inches).
Flexibility is maximized at the game, campground or a drive-in theatre in the Cullinan when its optional tailgating rear seats are deployed, allowing people to sit facing out of the tailgate. (Do not use while vehicle is in motion.) The MDX doesn’t offer tailgating seats.
The Cullinan has a much larger cargo volume than the MDX with its rear seat up (43.4 vs. 15.8 cubic feet).
Pressing a switch automatically lowers or raises the Cullinan’s rear seats, to make changing between cargo and passengers easier. The MDX doesn’t offer automatic folding seats.
The Cullinan’s rear cargo window opens separately from the rest of the tailgate door to allow quicker loading of small packages. The MDX’s rear cargo window doesn’t open.
The engine in the Cullinan is mounted longitudinally (North-South), instead of sideways, as in the MDX. This makes it easier to service and maintain, because there are no rear spark plugs and the accessory belts are in front.
Unlike the driver-only memory system in the MDX, the Cullinan has standard driver and passenger memory, so that when drivers switch, the memory setting adjusts the driver’s seat, steering wheel position, outside mirror angle, climate settings and radio stations and the front passenger seat also adjusts to the new passenger’s preset preferences.
The power windows standard on both the Cullinan and the MDX have locks to prevent small children from operating them. When the lock on the Cullinan is engaged the driver can still operate all of the windows, for instance to close one opened by a child. The MDX prevents the driver from operating the other windows just as it does the other passengers.
The Cullinan’s rain-sensitive wipers adjust their speed and turn on and off automatically based on the amount of rainfall on the windshield. This allows the driver to concentrate on driving without constantly adjusting the wipers. The MDX’s intermittent wipers change speed with vehicle speed, but can’t turn on and off or change speed based on changing rainfall.
To help drivers avoid possible obstacles, the Cullinan has standard cornering lights to illuminate around corners when the turn signals are activated. The MDX doesn’t offer cornering lights. The Cullinan also has standard adaptive headlights to illuminate around corners automatically by reading vehicle speed and steering wheel angle.
The Cullinan has a standard heated steering wheel to take the chill out of steering on extremely cold winter days before the vehicle heater warms up. A heated steering wheel costs extra on the MDX.
The Cullinan has standard massaging front seats in order to maximize comfort and eliminate fatigue on long trips. Massaging seats aren’t available in the MDX.
To quickly and conveniently keep personal devices charged without cables tangling and wearing out, the Rolls-Royce Cullinan has a standard wireless phone charging system (Qi) in the center console. The MDX doesn’t offer wireless personal charging.
The Cullinan’s Parking Assistant Plus can parallel park or back into a parking spot by itself, starting, stopping and changing direction automatically. The MDX doesn’t offer an automated parking system.
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