2019 Mercedes AMG GLC 63 Coupe vs. 2019 Alfa Romeo Stelvio Quadrifoglio

Detailed Review, Specifications & Comparison

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2019 Mercedes AMG GLC 63 Coupe

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2019 Alfa Romeo Stelvio Quadrifoglio

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Safety

For enhanced safety, the front and rear seat shoulder belts of the Mercedes AMG GLC 63 Coupe have pretensioners to tighten the seatbelts and eliminate dangerous slack in the event of a collision and force limiters to limit the pressure the belts will exert on the passengers. The Alfa Romeo Stelvio Quadrifoglio doesn’t offer pretensioners for the rear seat belts.

The AMG GLC 63 Coupe’s pre-crash front seatbelts will tighten automatically in the event the vehicle detects an impending crash, improving protection against injury significantly. The Stelvio Quadrifoglio doesn’t offer pre-crash pretensioners.

The AMG GLC 63 Coupe offers an optional Surround View System to allow the driver to see objects all around the vehicle on a screen. The Stelvio Quadrifoglio only offers a rear monitor and front and rear parking sensors that beep or flash a light. That doesn’t help with obstacles to the sides.

The AMG GLC 63 Coupe’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 Stelvio Quadrifoglio doesn’t offer a driver alert monitor.

The AMG GLC 63 Coupe has standard Mercedes-Benz Emergency Call, which uses a global positioning satellite (GPS) receiver and a cellular system to remotely unlock your doors if you lock your keys in, help track down your vehicle if it’s stolen or send emergency personnel to the scene if any airbags deploy. The Stelvio Quadrifoglio doesn’t offer a GPS response system, only a navigation computer with no live response for emergencies, so if you’re involved in an accident and you’re incapacitated help may not come as quickly.

Both the AMG GLC 63 Coupe and the Stelvio Quadrifoglio have standard driver and passenger frontal airbags, front side-impact airbags, driver knee airbags, side-impact head airbags, height adjustable front shoulder belts, four-wheel antilock brakes, all wheel drive, traction control, electronic stability systems to prevent skidding, crash mitigating brakes, daytime running lights, blind spot warning systems, rearview cameras and available lane departure warning systems.

Warranty

The AMG GLC 63 Coupe’s corrosion warranty is 1 year longer than the Stelvio Quadrifoglio’s (5 vs. 4 years).

There are over 2 times as many Mercedes dealers as there are Alfa Romeo dealers, which makes it much easier should you ever need service under the AMG GLC 63 Coupe’s warranty.

Engine

The AMG GLC 63 Coupe’s standard 4.0 turbo V8 produces 36 lbs.-ft. more torque (479 vs. 443) than the Stelvio Quadrifoglio’s 2.9 turbo V6. The AMG GLC63 S Coupe’s standard 4.0 turbo V8 produces 73 lbs.-ft. more torque (516 vs. 443) than the Stelvio Quadrifoglio’s 2.9 turbo V6.

As tested in Motor Trend the AMG GLC63 S Coupe is faster than the Alfa Romeo Stelvio Quadrifoglio:

AMG GLC 63

Stelvio

Zero to 30 MPH

1.1 sec

1.2 sec

Zero to 60 MPH

3.2 sec

3.5 sec

Zero to 80 MPH

5.5 sec

5.7 sec

Zero to 100 MPH

8.4 sec

9 sec

Passing 45 to 65 MPH

1.7 sec

1.8 sec

Quarter Mile

11.7 sec

12 sec

Speed in 1/4 Mile

116.5 MPH

114.4 MPH

Environmental Friendliness

In its Green Vehicle Guide, the U.S. Environmental Protection Agency (EPA) rates the Mercedes AMG GLC 63 Coupe higher (5 out of 10) than the Alfa Romeo Stelvio Quadrifoglio (3). This means the AMG GLC 63 Coupe produces up to 16.5 pounds less smog-producing pollutants than the Stelvio Quadrifoglio every 15,000 miles.

Transmission

A nine-speed automatic is standard on the Mercedes AMG GLC 63 Coupe, for better acceleration and lower engine speed on the highway. Only an eight-speed automatic is available for the Stelvio Quadrifoglio.

The AMG GLC 63 Coupe’s launch control uses engine electronics to hold engine RPM’s precisely in order to provide the most stable and rapid acceleration possible, using all of the available traction. The Stelvio Quadrifoglio doesn’t offer launch control.

Brakes and Stopping

For better stopping power the AMG GLC 63 Coupe’s brake rotors are larger than those on the Stelvio Quadrifoglio:

AMG GLC 63

AMG GLC63 S

Stelvio Quadrifoglio

Stelvio Quadrifoglio opt.

Front Rotors

15.4 inches

15.8 inches

14.2 inches

15.4 inches

Rear Rotors

14.2 inches

14.2 inches

13.8 inches

14.2 inches

Tires and Wheels

For better traction, the AMG GLC 63 Coupe has larger tires than the Stelvio Quadrifoglio (F:265/45R20 & R:295/40R20 vs. F:255/45R20 & R:285/40R20).

The AMG GLC 63 Coupe’s optional 265/40R21 front and 295/35R21 rear tires provide better handling because they have a lower 40 series front and 35 series rear profile (height to width ratio) that provides a stiffer sidewall than the Stelvio Quadrifoglio’s 45 series front and 40 series rear tires.

For better ride, handling and brake cooling the AMG GLC 63 Coupe offers optional 21-inch wheels. The Stelvio Quadrifoglio’s largest wheels are only 20-inches.

Suspension and Handling

The front and rear suspension of the AMG GLC 63 Coupe uses air springs for a smoother, controlled ride than the Stelvio Quadrifoglio, which uses coil springs. Air springs maintain proper ride height and ride more smoothly.

The AMG GLC 63 Coupe’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 Stelvio Quadrifoglio doesn’t offer drift compensation steering.

For a smoother ride and more stable handling, the AMG GLC 63 Coupe’s wheelbase is 2.1 inches longer than on the Stelvio Quadrifoglio (113.1 inches vs. 111 inches).

For better handling and stability, the average track (width between the wheels) on the AMG GLC 63 Coupe is 4.6 inches wider in the front and 2 inches wider in the rear than the track on the Stelvio Quadrifoglio.

The AMG GLC63 S Coupe handles at .96 G’s, while the Stelvio Quadrifoglio pulls only .92 G’s of cornering force in a Motor Trend skidpad test.

The AMG GLC63 S Coupe executes Motor Trend’s “Figure Eight” maneuver quicker than the Stelvio Quadrifoglio (24.1 seconds @ .85 average G’s vs. 24.9 seconds @ .79 average G’s).

Chassis

As tested by Car and Driver, the interior of the AMG GLC63 S Coupe is quieter than the Stelvio Quadrifoglio:

AMG GLC 63 Coupe

Stelvio Quadrifoglio

At idle

40 dB

47 dB

Full-Throttle

78 dB

80 dB

Passenger Space

The AMG GLC 63 Coupe has 4.2 inches more front legroom and 5.4 inches more rear legroom than the Stelvio Quadrifoglio.

For enhanced passenger comfort on long trips the AMG GLC 63 Coupe’s rear seats recline. The Stelvio Quadrifoglio’s rear seats don’t recline.

Cargo Capacity

Pressing a switch automatically lowers the AMG GLC 63 Coupe’s rear seats, to make changing between passengers and cargo easier. The Stelvio Quadrifoglio doesn’t offer automatic folding seats.

Towing

The AMG GLC 63 Coupe’s standard towing capacity is much higher than the Stelvio Quadrifoglio’s (3500 vs. 3000 pounds).

Ergonomics

Unlike the driver-only memory seat and mirrors in the Stelvio Quadrifoglio, the AMG GLC 63 Coupe 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 AMG GLC 63 Coupe offers an optional 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 Stelvio Quadrifoglio doesn’t offer a heads-up display.

If the windows are left open on the AMG GLC 63 Coupe the driver can close them all at the outside door handle or from a distance using the remote (remote must be aimed at door sensor). On a hot day the driver can lower the windows from a distance using the keyless remote. The driver of the Stelvio Quadrifoglio can only operate the windows from inside the vehicle, with the ignition on.

When the AMG GLC 63 Coupe is put in reverse, the passenger rearview mirror tilts from its original position. This gives the driver a better view of the curb during parallel parking maneuvers. Shifting out of reverse puts the mirror into its original position. The Stelvio Quadrifoglio’s mirror doesn’t automatically adjust for backing.

Optional air-conditioned seats in the AMG GLC 63 Coupe keep the driver and front passenger comfortable and take the sting out of hot seats in summer. The Stelvio Quadrifoglio doesn’t offer air-conditioned seats.

The AMG GLC 63 Coupe’s optional Active Parking Assist can parallel park or back into a parking spot by itself, with the driver only controlling speed with the brake pedal. The Stelvio Quadrifoglio doesn’t offer an automated parking system.

Model Availability

The Mercedes AMG GLC 63 comes in traditional 4-door sport utility and 4-door coupe bodystyles; the Alfa Romeo Stelvio Quadrifoglio isn’t available as a coupe style sport utility.

© 1991-2018 Advanta-STAR Automotive Research. All rights reserved.

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