Certified Benz & Beemer Compares 2013 BMW M3 VS 2013 Porsche 911 Near Scottsdale, AZ

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2013 BMW M3

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2013 Porsche 911

Safety Comparison

The M3 has standard BMW Assist, 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 911 Turbo 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 M3 and the 911 Turbo have standard driver and passenger frontal airbags, front side-impact airbags, side-impact head airbags, front seatbelt pretensioners, four-wheel antilock brakes, traction control and electronic stability systems to prevent skidding.

Warranty Comparison

The M3’s corrosion warranty is 2 years longer than the 911 Turbo’s (12 vs. 10 years).

BMW pays for scheduled maintenance on the M3 for 4 years and 50,000 miles. BMW will pay for oil changes, tire rotation, lubrication and any other scheduled maintenance. Porsche doesn’t pay scheduled maintenance for the 911 Turbo.

There are over 74 percent more BMW dealers than there are Porsche dealers, which makes it much easier should you ever need service under the M3’s warranty.

Reliability Comparison

To reliably power the ignition and other systems and to recharge the battery, the M3 has a standard 180 amp alternator. The 911 Turbo’s 150 amp alternator isn’t as powerful.

To reliably start during all conditions and help handle large electrical loads, the M3 has a standard 570 amp battery. The 911 Turbo’s 340 amp battery isn’t as powerful.

The battery on the M3 is in the trunk, which protects it from hot underhood temperatures which can degrade battery life. By keeping the M3’s battery 20 to 30 degrees cooler, its life is increased by years. The 911 Turbo’s battery is in the hot engine compartment.

Brakes and Stopping Comparison

For better stopping power the M3’s standard brake rotors are larger than those on the 911 Turbo:


911 Turbo

Front Rotors

14.2 inches

13.8 inches

The M3 stops shorter than the 911 Turbo:


911 Turbo

70 to 0 MPH

153 feet

162 feet

Car and Driver

Tires and Wheels Comparison

For better traction, the M3’s front tires are larger than the largest tires available on the 911 Turbo (245/40R18 vs. 235/35R19).

Suspension and Handling Comparison

The M3 has vehicle speed sensitive variable-assist power steering, for low-effort parking, better control at highway speeds and during hard cornering, and a better feel of the road. The 911 Turbo doesn’t offer variable-assist power steering.

For a smoother ride and more stable handling, the M3’s wheelbase is 16.2 inches longer than on the 911 Turbo (108.7 inches vs. 92.5 inches).

For better handling and stability, the track (width between the wheels) on the M3 is 2 inches wider in the front and .5 inches wider in the rear than the average track on the 911 Turbo.

The M3’s front to rear weight distribution is more even (51.2% to 48.8%) than the 911 Turbo’s (39.1% to 60.9%). This gives the M3 more stable handling and braking.

The M3 Coupe handles at .97 G’s, while the 911 Turbo Coupe pulls only .91 G’s of cornering force in a Car and Driver skidpad test.

The M3 Coupe performs Car and Driver’s emergency lane change maneuver 2.5 MPH faster than the 911 Turbo S Coupe (75.1 vs. 72.6 MPH).

Chassis Comparison

The M3 Convertible’s standard power retractable hardtop allows a seamless transition from an open car, to a completely sealed coupe. The 911 Turbo doesn’t offer a retractable hardtop.

As tested by AutoWeek, the interior of the M3 Coupe is quieter than the 911 Turbo Coupe:


911 Turbo

At idle

53 dB

58 dB


82 dB

88 dB

60 MPH Cruising

65 dB

80 dB

Passenger Space Comparison

Because it has more passenger and cargo room, the M3 Coupe is rated a Subcompact car by the EPA, while the 911 Turbo Coupe is rated a Minicompact. The M3 Convertible is rated a Subcompact car by the EPA, while the 911 Turbo Cabriolet is rated a Minicompact.

The M3 Coupe has 24.5 cubic feet more passenger volume than the 911 Turbo (88.5 vs. 64).

The M3 Coupe has .1 inches more front headroom and 5.9 inches more front shoulder room than the 911 Turbo Coupe.

The M3 Convertible has .2 inches more front headroom and 3.8 inches more front shoulder room than the 911 Turbo Cabriolet.

Cargo Capacity Comparison

The M3 Coupe has a much larger trunk than the 911 Turbo Coupe (11.1 vs. 4.8 cubic feet).

The M3 Convertible has a much larger trunk with its top down than the 911 Turbo Cabriolet (7.4 vs. 4.8 cubic feet).

With its coupe or convertible body style, valet key, locking rear seatbacks and remote trunk release lockout, the M3 offers cargo security. The 911 Turbo’s non-lockable folding seat and non-lockable remote release defeat cargo security.

Ergonomics Comparison

The M3’s standard easy entry system glides the driver’s seat back, making it easier for the driver to get in and out. The 911 Turbo doesn’t offer an easy entry system.

The M3’s standard power windows have a locking feature to keep children in the rear seat from operating them. Porsche does not offer a locking feature on the 911 Turbo’s standard power windows.

The M3’s front and rear power windows all open or close fully with one touch of the switches, making it more convenient at drive-up windows and toll booths, or when talking with someone outside the car. The 911 Turbo’s rear power window switches have to be held the entire time to open or close them fully.

If the windows are left down on the M3 the driver can raise them all using the key in the outside lock cylinder; on a hot day the driver can lower the windows. The driver of the 911 Turbo can’t use the remote to operate the windows.

The M3 has a standard automatic headlight on/off feature. When the ignition is on, the headlights automatically turn on at dusk and off after dawn. The 911 Turbo doesn’t offer automatic headlights.

While driving with high beams on, sensitive light sensors available for the M3 detect other vehicles which could be blinded and automatically switch to low beams. The 911 Turbo doesn’t offer automatic dimming high beams.

A power rear sunshade is optional in the M3 Coupe to help block heat and glare for the rear passengers. The 911 Turbo doesn’t offer a rear sunshade.

The M3’s standard dual zone air conditioning allows the driver and front passenger to choose two completely different temperatures so people with different temperature preferences won’t have to compromise. This makes both the driver and front passenger as comfortable as possible. The 911 Turbo doesn’t offer dual zone air conditioning.

For greater rear passenger comfort, the M3 has standard rear a/c vents to keep rear occupants more comfortable. The 911 Turbo doesn’t offer rear vents.

To keep a safe, consistent following distance, the M3 offers an optional Active Cruise Control, which alters the speed of the vehicle without driver intervention. This allows the driver to use cruise control more safely without constantly having to disengage it when approaching slower traffic. The 911 Turbo doesn’t offer an adaptive cruise control.

Optional BMW Apps for the M3 allows the driver and passengers access to select programs on their smartphones, including reading text messages aloud, playing internet radio stations, tagging songs to buy them later, following twitter accounts and other online activities without taking their eyes off the road or their hands from the wheel. The 911 Turbo doesn’t offer factory integrated smartphone program access.

Bluetooth wireless connectivity is standard on the M3, connecting the driver and passenger’s cell phones to the vehicle systems. This allows them to use the vehicle’s stereo and hand controls to place calls safely and easily. Porsche doesn’t offer wireless connectivity on the 911 Turbo.

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