2020 Mercedes AMG C-Class Cabriolet vs. 2020 Porsche 911

Detailed Review, Specifications & Comparison

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Safety

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For enhanced safety, the front and rear seat shoulder belts of the Mercedes AMG C-Class Cabriolet 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 Porsche 911 doesn’t offer pretensioners for the rear seat belts.

The AMG C-Class Cabriolet’s pre-crash front seatbelts will tighten automatically in the event the vehicle detects an impending crash, improving protection against injury significantly. The 911 doesn’t offer pre-crash pretensioners.

The AMG C-Class Cabriolet has standard front and rear seat side-impact airbags and head airbags, which act as a forgiving barrier between the passengers and the door. Combined with high-strength steel door beams this system increases protection from broadside collisions. The 911 doesn't offer rear-seat side-impact airbags, only ones for front seat occupants.

The AMG C-Class Cabriolet’s blind spot warning system uses digital cameras monitored by computer to alert the driver to moving objects in the vehicle’s blind spots where the side view mirrors don’t reveal them. The 911 doesn’t offer a system to reveal objects in the driver’s blind spots.

To help make backing safer, the AMG C-Class Cabriolet’s optional cross-path warning system uses wide-angle radar in the rear bumper to alert the driver to vehicles approaching from the side, helping the driver avoid collisions. The 911 doesn’t offer a cross-path warning system.

The AMG C-Class Cabriolet’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 911 doesn’t offer a driver alert monitor.

Both the AMG C-Class Cabriolet and the 911 have standard driver and passenger frontal airbags, front side-impact airbags, side-impact head airbags, four-wheel antilock brakes, traction control, electronic stability systems to prevent skidding, crash mitigating brakes, daytime running lights, rearview cameras, available lane departure warning systems and around view monitors.

The Mercedes AMG C-Class Cabriolet weighs 590 to 921 pounds more than the Porsche 911. The NHTSA advises that heavier cars are much safer in collisions than their significantly lighter counterparts.

Warranty

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There are over 2 times as many Mercedes dealers as there are Porsche dealers, which makes it much easier should you ever need service under the AMG C-Class Cabriolet’s warranty.

Reliability

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J.D. Power and Associates’ 2019 Initial Quality Study of new car owners surveyed provide the statistics that show that Mercedes vehicles are better in initial quality than Porsche vehicles. J.D. Power ranks Mercedes 12th in initial quality. With 2 more problems per 100 vehicles, Porsche is ranked 15th.

Engine

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The AMG C-Class Cabriolet has more powerful engines than the 911:

Horsepower

Torque

AMG C 43 Cabriolet 3.0 turbo V6

385 HP

384 lbs.-ft.

AMG C 63 Cabriolet 4.0 turbo V8

469 HP

479 lbs.-ft.

AMG C 63 S Cabriolet 4.0 turbo V8

503 HP

516 lbs.-ft.

911 3.0 turbo 6-cylinder

379 HP

331 lbs.-ft.

911 S 3.0 turbo 6-cylinder

443 HP

390 lbs.-ft.

Fuel Economy and Range

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On the EPA test cycle the AMG C 43 Cabriolet 4x4 gets better fuel mileage than the 911 S Cabriolet 4 Auto 3.0 twin-turbo 6 cyl. (443 HP) (18 city/25 hwy vs. 18 city/23 hwy).

Transmission

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The Mercedes AMG C-Class Cabriolet comes standard with an automatic transmission, for driver comfort, especially in the city. Automatic costs extra on the 911.

A nine-speed automatic (SMG) is standard on the Mercedes AMG C-Class Cabriolet, for better acceleration and lower engine speed on the highway. Only an eight-speed automatic is available for the 911.

Brakes and Stopping

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For better stopping power the AMG C-Class Cabriolet’s standard front brake rotors are larger than those on the 911:

AMG C-Class Cabriolet

911

Front Rotors

14.2 inches

13 inches

Tires and Wheels

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For better traction, the AMG C 63 Cabriolet’s front tires are larger than the largest tires available on the 911 (255/40R18 vs. 245/35R20).

Changing a flat tire near traffic can be dangerous and inconvenient. The run-flat tires available on the AMG C-Class Cabriolet can be driven up to 50 miles without any air pressure, allowing you to drive to a service station for a repair. The 911 doesn’t offer run-flat tires.

Suspension and Handling

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The AMG C-Class Cabriolet’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 911 doesn’t offer drift compensation steering.

For a smoother ride and more stable handling, the AMG C-Class Cabriolet’s wheelbase is 15.3 inches longer than on the 911 (111.8 inches vs. 96.5 inches).

For better handling and stability, the average track (width between the wheels) on the AMG C-Class Cabriolet is 1.1 inches wider in the front and .8 inches wider in the rear than the average track on the 911.

The AMG C-Class Cabriolet’s front to rear weight distribution is more even (53.5% to 46.5%) than the 911’s (36.4% to 63.6%). This gives the AMG C-Class Cabriolet more stable handling and braking.

Chassis

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To almost totally eliminate engine vibration in the passenger area, the AMG C-Class Cabriolet 63 S has an electronically controlled liquid-filled front engine mount. A computer-controlled electric current in the liquid changes its viscosity, allowing the mount to dampen the engine completely at all RPMs. The 911 uses conventional solid rubber engine mounts.

Passenger Space

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The AMG C-Class Cabriolet has 8.3 cubic feet more passenger volume than the 911 (81.3 vs. 73).

The AMG C-Class Cabriolet has .9 inches more front headroom, 2.2 inches more front shoulder room, 3.1 inches more rear headroom, 4.8 inches more rear legroom and 3.8 inches more rear shoulder room than the 911.

Cargo Capacity

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The AMG C-Class Cabriolet has a much larger trunk with its top down than the 911 Cabriolet with its top down (7 vs. 4.6 cubic feet).

With its convertible body style, locking rear seatbacks and remote trunk release lockout, the AMG C-Class offers cargo security. The 911’s non-lockable folding seat defeats cargo security.

Ergonomics

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The AMG C-Class Cabriolet has a standard remote vehicle starting system, so the vehicle can be started from inside the driver's house. This allows the driver to comfortably warm up the engine before going out to the vehicle. The climate system will also automatically heat or cool the interior. The 911 doesn’t offer a remote starting system.

Unlike the driver-only memory system optional at extra cost in the 911, the AMG C-Class Cabriolet 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 C-Class Cabriolet’s standard easy entry system raises the steering wheel, making it easier for the driver to get in and out. An easy entry system costs extra on the 911.

The AMG C-Class Cabriolet 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 911 doesn’t offer a heads-up display.

The AMG C-Class Cabriolet’s standard power windows have a locking feature to keep children in the rear seat from operating them, but the driver can still raise and lower all of them with the lock engaged. Porsche does not offer a locking feature on the 911’s standard power windows.

If the windows are left open on the AMG C-Class Cabriolet the driver can close them all at the outside door handle or from a distance using the remote. On a hot day the driver can lower the windows from a distance using the keyless remote. The driver of the 911 can only operate the windows from inside the vehicle, with the ignition on.

In case of a sudden change of weather, the AMG C-Class Cabriolet has a standard remote convertible top that can be raised from a distance to protect the interior of the vehicle from damage. The 911 doesn’t offer a remote top, so the driver will have to run to the car, get in, turn the ignition on and raise the top to prevent the interior from being damaged.

To shield the driver and front passenger’s vision over a larger portion of the windshield and side windows, the AMG C-Class Cabriolet has standard extendable sun visors. The 911 doesn’t offer extendable visors.

To quickly and conveniently keep personal devices charged without cables tangling and wearing out, the Mercedes AMG C-Class offers an optional wireless phone charging system (Qi) in the center console. The 911 doesn’t offer wireless personal charging.

The AMG C-Class Cabriolet’s optional Active Parking Assist can parallel park or back into a parking spot by itself, starting, stopping and changing direction automatically. The 911 doesn’t offer an automated parking system.

Model Availability

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The Mercedes AMG C-Class comes in coupe, convertible and sedan bodystyles; the Porsche 911 isn’t available as a sedan.

Recommendations

© 1999 - 2020 Advanta-STAR Automotive Research. All rights reserved. This vehicle comparison and all of the content in it are provided only by license from Advanta-STAR Automotive Research Corporation of America. If you are not a legally licensed user of this vehicle comparison, it is against federal law to access it, copy it, forward it or use it in any manner whatsoever. Any unauthorized use of this vehicle comparison is a violation of U.S. and international law and is punishable criminally and civilly. 6IUEX-0KENZ 45.55.47.189 2020/02/29

Consumer Reports® recommends the Mercedes AMG C-Class Cabriolet, based on reliability, safety and performance.

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