Compare the2025 Infiniti QX50VS 2025 Acura RDX

Safety
Warranty
Reliability
Engine
Fuel Economy and Range
Transmission
Brakes and Stopping
Tires and Wheels
Suspension and Handling
Passenger Space
Cargo Capacity
Servicing Ease
Ergonomics
Economic Advantages

Safety

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For enhanced safety, the front and rear seat shoulder belts of the Infiniti QX50 have pretensioners to tighten the seatbelts and eliminate dangerous slack in the event of a collision. The Acura RDX doesn’t offer pretensioners for its rear seat belts.

In the past twenty years hundreds of infants and young children have died after being left in vehicles, usually by accident. When turning the vehicle off, drivers of the QX50 are reminded to check the back seat if they opened the rear door before starting out. The RDX doesn’t offer a back seat reminder.

Over 200 people are killed each year when backed over by motor vehicles. The QX50 has standard Rear Automatic Braking that uses rear sensors to monitor for objects to the rear and automatically applies the brakes to prevent a collision. The RDX doesn’t offer backup collision prevention brakes.

Both the QX50 and the RDX have standard driver and passenger frontal airbags, front side-impact airbags, driver and front passenger knee airbags, side-impact head airbags, height adjustable front shoulder belts, plastic fuel tanks, four-wheel antilock brakes, all wheel drive, traction control, electronic stability systems to prevent skidding, crash mitigating brakes, daytime running lights, lane departure warning systems, blind spot warning systems, rearview cameras, rear cross-path warning and available around view monitors.

The National Highway Traffic Safety Administration does 35 MPH front crash tests on new vehicles. In this test, results indicate that the Infiniti QX50 is safer than the Acura RDX:

	QX50	RDX
	Driver
STARS	4 Stars	4 Stars
HIC	236	300
Neck Injury Risk	26%	26%
Neck Stress	245 lbs.	262 lbs.
Leg Forces (l/r)	155/130 lbs.	328/464 lbs.
	Passenger
STARS	4 Stars	4 Stars
HIC	333	353
Chest Compression	.6 inches	.6 inches
Neck Compression	48 lbs.	84 lbs.

New test not comparable to pre-2011 test results. More stars = Better. Lower test results = Better.

The National Highway Traffic Safety Administration does side impact tests on new vehicles. In this test, which crashes the vehicle into a flat barrier at 38.5 MPH and into a post at 20 MPH, results indicate that the Infiniti QX50 is safer than the Acura RDX:

	QX50	RDX
	Rear Seat
STARS	5 Stars	5 Stars
HIC	73	124
Spine Acceleration	25 G’s	52 G’s
Hip Force	227 lbs.	462 lbs.
	Into Pole
STARS	5 Stars	5 Stars
HIC	333	486
Spine Acceleration	39 G’s	39 G’s
Hip Force	339 lbs.	704 lbs.

New test not comparable to pre-2011 test results. More stars = Better. Lower test results = Better.

Warranty

The QX50 comes with a full 4-year/60,000-mile basic warranty, which covers the entire truck and includes 24-hour roadside assistance. The RDX’s 4-year/50,000-mile basic warranty expires 10,000 miles sooner.

The QX50’s corrosion warranty is 2 years longer than the RDX’s (7 vs. 5 years).

Infiniti pays for scheduled maintenance on the QX50 for 2 years and 10500 miles longer than Acura pays for maintenance for the RDX (3/22500 vs. 1/12000).

Reliability

The RDX’s redline is at 7000 RPM, which causes more engine wear, and a greater chance of a catastrophic engine failure. The QX50 has a 6000 RPM redline.

J.D. Power and Associates’ 2024 Initial Quality Study of new car owners surveyed provide the statistics that show that Infiniti vehicles are better in initial quality than Acura vehicles. J.D. Power ranks Infiniti above average in initial quality. With 6 more problems per 100 vehicles, Acura is rated lower.

Engine

As tested in Motor Trend the Infiniti QX50 is faster than the Acura RDX:

	QX50	RDX
Zero to 30 MPH	2.3 sec	2.6 sec
Zero to 60 MPH	6.3 sec	7.1 sec
Zero to 80 MPH	10.5 sec	11.8 sec
Passing 45 to 65 MPH	3.3 sec	3.6 sec
Quarter Mile	14.8 sec	15.5 sec
Speed in 1/4 Mile	93.6 MPH	90.7 MPH

Fuel Economy and Range

On the EPA test cycle the QX50 gets better mileage than the RDX:

		MPG
QX50
	2.0 turbo 4-cyl.	22 city/28 hwy
RDX
	2.0 turbo 4-cyl.	21 city/27 hwy
	A-Spec 2.0 turbo 4-cyl.	21 city/26 hwy

Transmission

The QX50 has a standard continuously variable transmission (CVT). With no “steps” between gears, it can keep the engine at the most efficient speed for fuel economy, or keep it at its peak horsepower indefinitely for maximum acceleration. The RDX doesn’t offer a CVT.

Brakes and Stopping

For better stopping power the QX50’s front brake rotors are larger than those on the RDX:

	QX50	RDX
Front Rotors	13 inches	12.4 inches

The QX50’s standard front and rear disc brakes are vented to help dissipate heat for shorter stops with less fading. The rear discs on the RDX are solid, not vented.

The QX50 stops much shorter than the RDX:

	QX50	RDX
60 to 0 MPH	121 feet	133 feet	Motor Trend

Tires and Wheels

Changing a flat tire near traffic can be dangerous and inconvenient. The run-flat tires standard on the QX50 can be driven up to 50 miles without any air pressure, allowing you to drive to a service station for a repair. The RDX doesn’t offer run-flat tires.

Suspension and Handling

For a smoother ride and more stable handling, the QX50’s wheelbase is 1.9 inches longer than on the RDX (110.2 inches vs. 108.3 inches).

The QX50 handles at .84 G’s, while the RDX pulls only .81 G’s of cornering force in a Motor Trend skidpad test.

The QX50 executes Motor Trend’s “Figure Eight” maneuver 1 seconds quicker than the RDX (26.7 seconds @ .66 average G’s vs. 27.7 seconds @ .62 average G’s).

For better maneuverability, the QX50’s turning circle is 2.5 feet tighter than the RDX’s (36.4 feet vs. 38.9 feet).

For greater off-road capability the QX50 has a greater minimum ground clearance than the RDX (8.6 vs. 8.2 inches), allowing the QX50 to travel over rougher terrain without being stopped or damaged.

Passenger Space

The QX50 has 1.4 inches more front headroom, .6 inches more front hip room, .8 inches more rear headroom, .3 inches more rear legroom, 3.9 inches more rear hip room and .5 inches more rear shoulder room than the RDX.

For enhanced passenger comfort on long trips the QX50’s rear seats recline. The RDX’s rear seats don’t recline.

Cargo Capacity

The QX50 has a larger cargo volume than the RDX with its rear seat up (31.4 vs. 31.1 cubic feet).

Servicing Ease

J.D. Power and Associates surveys of service recipients show that Infiniti service is better than Acura. J.D. Power ranks Infiniti 6th in service department satisfaction (above the industry average). With a 12% lower rating, Acura is ranked 9th.

Ergonomics

The QX50’s standard Infiniti Intelligent Key allow you to unlock the doors from any outside door handle, open the cargo door, and start the engine, all without removing the key from the pocket or purse. Smart Entry standard on the RDX doesn’t offer a sensor on the rear doors, so you’ll have to reach a front handle to unlock the rear door.

Manual rear side window sunshades are available in the QX50 to help block heat and glare for the rear passengers. The RDX doesn’t offer rear side window sunshades.

Economic Advantages

According to The Car Book by Jack Gillis, the QX50 is less expensive to operate than the RDX because it costs $318 less to do the manufacturer’s suggested maintenance for 50,000 miles. Typical repairs cost much less on the QX50 than the RDX, including $245 less for front brake pads and $35 less for a fuel pump.