Certified Benz & Beemer Compares 2020 BMW M8 VS 2020 Porsche 911 Near Scottsdale, AZ

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2020 BMW M8

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VS

2020 Porsche 911

Safety Comparison

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The M8’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 M8 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 911 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.

To provide maximum traction and stability on all roads, All-Wheel Drive is standard on the M8. But it costs extra on the 911.

The M8’s optional 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 M8’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 M8’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 M8 and the 911 have standard driver and passenger frontal airbags, front side-impact airbags, side-impact head airbags, front seatbelt pretensioners, four-wheel antilock brakes, traction control, electronic stability systems to prevent skidding, crash mitigating brakes, daytime running lights, rearview cameras, available night vision systems, lane departure warning systems and around view monitors.

The BMW M8 weighs 654 to 1206 pounds more than the Porsche 911. The NHTSA advises that heavier cars are much safer in collisions than their significantly lighter counterparts.

Warranty Comparison

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BMW pays for scheduled maintenance on the M8 for 2 years and 26000 miles longer than Porsche pays for maintenance for the 911 (3/36,000 vs. 1/10,000).

There are over 82 percent more BMW dealers than there are Porsche dealers, which makes it much easier should you ever need service under the M8’s warranty.

Reliability Comparison

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From surveys of all its subscribers, Consumer Reports’ December 2018 Auto Issue reports that BMW vehicles are more reliable than Porsche vehicles. Consumer Reports ranks BMW 3 places higher in reliability than Porsche.

Engine Comparison

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The M8’s standard 4.4 turbo V8 produces 221 more horsepower (600 vs. 379) and 222 lbs.-ft. more torque (553 vs. 331) than the 911’s standard 3.0 turbo 6 cyl. The M8’s 4.4 turbo V8 produces 157 more horsepower (600 vs. 443) and 163 lbs.-ft. more torque (553 vs. 390) than the 911 S’ standard 3.0 turbo 6 cyl. The M8 Competition’s standard 4.4 turbo V8 produces 174 more horsepower (617 vs. 443) and 163 lbs.-ft. more torque (553 vs. 390) than the 911 S’ standard 3.0 turbo 6 cyl.

Fuel Economy and Range Comparison

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Regenerative brakes improve the M8’s fuel efficiency by converting inertia back into energy instead of wasting it. The 911 doesn’t offer a regenerative braking system.

The M8 has 3.2 gallons more fuel capacity than the 911’s standard fuel tank (20.1 vs. 16.9 gallons), for longer range between fill-ups. The M8 has 2.5 gallons more fuel capacity than the 911 AWD’s standard fuel tank (20.1 vs. 17.6 gallons).

Brakes and Stopping Comparison

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For better stopping power the M8’s standard brake rotors are larger than those on the 911:

M8

911

Front Rotors

15.6 inches

13 inches

Rear Rotors

15 inches

13 inches

Tires and Wheels Comparison

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For better traction, the M8 has larger front tires than the 911 (275/35R20 vs. 235/40R19). The M8’s front tires are larger than the largest tires available on the 911 (275/35R20 vs. 245/35R20).

The M8’s tires provide better handling because they have a lower 35 series profile (height to width ratio) that provides a stiffer sidewall than the 911’s standard 40 series front tires.

For better ride, handling and brake cooling the M8 has standard 20-inch wheels. Smaller 19-inch front wheels are standard on the 911.

Suspension and Handling Comparison

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For a smoother ride and more stable handling, the M8’s wheelbase is 14.8 inches longer than on the 911 (111.3 inches vs. 96.5 inches).

For better handling and stability, the track (width between the wheels) on the M8 is 1.3 inches wider in the front and 3.1 inches wider in the rear than the average track on the 911.

The M8’s front to rear weight distribution is more even (55.2% to 44.8%) than the 911’s (35.7% to 64.3%). This gives the M8 more stable handling and braking.

Passenger Space Comparison

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Because it has more passenger and cargo room, the EPA rates the M8 Coupe a Subcompact car, while the 911 Coupe is rated a Minicompact.

The M8 has 8 cubic feet more passenger volume than the 911 (81 vs. 73).

Cargo Capacity Comparison

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The M8 Coupe has a much larger trunk than the 911 Coupe with its rear seat up (14.8 vs. 4.6 cubic feet). The M8 has a much larger trunk with its rear seat folded than the 911 Coupe with its rear seat folded (14.8 vs. 14 cubic feet).

The M8 Convertible has a much larger trunk with its top down than the 911 Cabriolet with its top down (12.4 vs. 4.6 cubic feet). The M8 Convertible has a much larger trunk than the 911 Cabriolet with its top up (12.4 vs. 10.4 cubic feet).

To make loading and unloading groceries and cargo easier when your hands are full, the M8’s power trunk can be opened or closed just by kicking your foot under the back bumper, leaving your hands completely free. The 911 doesn’t offer a power or hands-free opening trunk.

Ergonomics Comparison

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The M8 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.

The M8’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 M8 has a standard 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.

If the windows are left open on the M8 the driver can close them all at the outside door handle. 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.

The M8 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 costs extra on the 911.

To quickly and conveniently keep personal devices charged without cables tangling and wearing out, the BMW M8 has a standard wireless phone charging system (Qi) in the center console. The 911 doesn’t offer wireless personal charging.

The M8’s optional Parking Assistant Plus can parallel park by itself, starting, stopping and changing direction automatically. The 911 doesn’t offer an automated parking system.

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