Certified Benz & Beemer Compares 2015 BMW M4 VS 2015 Porsche 911 Near Scottsdale, AZ

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2015 BMW M4

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VS

2015 Porsche 911

Safety Comparison

The M4’s optional lane departure warning system alerts a temporarily inattentive driver when the vehicle begins to leave its lane. The 911 doesn’t offer a lane departure warning system.

The M4 offers an optional Side and Top View Cameras to allow the driver to see objects all around the vehicle on a screen. The 911 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 M4’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.

The M4 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 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 M4 and the 911 have standard driver and passenger frontal airbags, front side-impact airbags, driver and front passenger knee airbags, side-impact head airbags, front seatbelt pretensioners, plastic fuel tanks, four-wheel antilock brakes, traction control and electronic stability systems to prevent skidding.

Warranty Comparison

The M4’s corrosion warranty is 2 years longer than the 911’s (12 vs. 10 years).

BMW pays for scheduled maintenance on the M4 for 4 years and 50,000 miles. BMW will pay for oil changes, lubrication and any other required maintenance. Porsche doesn’t pay scheduled maintenance for the 911.

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 M4’s warranty.

Reliability Comparison

To reliably power the ignition and other systems and to recharge the battery, the M4 has a standard 209-amp alternator. The 911’s 175-amp alternator isn’t as powerful.

To reliably start during all conditions and help handle large electrical loads, the M4 has a standard 900-amp battery. The 911’s 520-amp battery isn’t as powerful.

Engine Comparison

The M4’s 3.0 turbo 6 cyl. produces 75 more horsepower (425 vs. 350) and 119 lbs.-ft. more torque (406 vs. 287) than the 911’s standard 3.4 DOHC 6 cyl. The M4’s 3.0 turbo 6 cyl. produces 25 more horsepower (425 vs. 400) and 81 lbs.-ft. more torque (406 vs. 325) than the 911 S’ standard 3.8 DOHC 6 cyl. The M4’s 3.0 turbo 6 cyl. produces 81 lbs.-ft. more torque (406 vs. 325) than the 911 GTS’ standard 3.8 DOHC 6 cyl.

As tested in Car and Driver the BMW M4 is faster than the 911 S (automatics tested):

M4

911

Zero to 60 MPH

3.9 sec

4 sec

Zero to 100 MPH

8.6 sec

9.3 sec

5 to 60 MPH Rolling Start

4.2 sec

5 sec

Passing 30 to 50 MPH

2.3 sec

2.9 sec

Quarter Mile

12.1 sec

12.4 sec

Speed in 1/4 Mile

119 MPH

116 MPH

Brakes and Stopping Comparison

The M4 stops shorter than the 911:

M4

911

80 to 0 MPH

193 feet

194 feet

Road & Track

70 to 0 MPH

151 feet

153 feet

Car and Driver

60 to 0 MPH

106 feet

115 feet

Road & Track

Tires and Wheels Comparison

For better traction, the M4 has larger front tires than the 911 (255/40R18 vs. 235/40R19). The M4’s front tires are larger than the largest tires available on the 911 (255/40R18 vs. 245/35R20).

Suspension and Handling Comparison

For a smoother ride and more stable handling, the M4’s wheelbase is 14.2 inches longer than on the 911 (110.7 inches vs. 96.5 inches). The M4’s wheelbase is 14 inches longer than on the 911 GT3 Coupe (110.7 feet vs. 96.7 inches).

For better handling and stability, the track (width between the wheels) on the M4 is 1.7 inches wider in the front and 2.6 inches wider in the rear than the average track on the 911.

The M4’s front to rear weight distribution is more even (51.8% to 48.2%) than the 911’s (39.3% to 60.7%). This gives the M4 more stable handling and braking.

Chassis Comparison

The M4’s standard power retractable hardtop allows a seamless transition from an open car, to a completely sealed coupe. The 911 doesn’t offer a retractable hardtop.

As tested by Car and Driver, the interior of the M4 Coupe is quieter than the 911 GT3 Coupe:

M4

911

At idle

48 dB

59 dB

Full-Throttle

87 dB

94 dB

70 MPH Cruising

68 dB

77 dB

Passenger Space Comparison

Because it has more passenger and cargo room, the M4 Coupe is rated a Compact car by the EPA, while the 911 Coupe is rated a Minicompact. The M4 Convertible is rated a Subcompact car by the EPA, while the 911 Cabriolet is rated a Minicompact.

The M4 Coupe has 20 cubic feet more passenger volume than the 911 Coupe (90 vs. 70). The M4 Convertible has 23 cubic feet more passenger volume than the 911 Cabriolet (91 vs. 68).

The M4 Coupe has 1.8 inches more front headroom, 4.5 inches more front shoulder room, 5.1 inches more rear headroom, 8.7 inches more rear legroom and 3.4 inches more rear shoulder room than the 911 Coupe.

The M4 Convertible has 2.4 inches more front headroom and 6.1 inches more rear headroom than the 911 Cabriolet.

Cargo Capacity Comparison

The M4 Coupe has a much larger trunk than the 911 Coupe with its rear seat up (11 vs. 5.1 cubic feet). The M4 has a much larger trunk with its rear seat folded than the 911 Coupe with its rear seat folded (11 vs. 9.2 cubic feet).

The M4 Convertible has a much larger trunk with its top down than the 911 Cabriolet (7.8 vs. 4.8 cubic feet). The M4 Convertible has a much larger trunk with its top up than the 911 Cabriolet (13 vs. 4.8 cubic feet).

To make loading groceries and cargo easier when your hands are full, the M4’s available trunk can be opened just by kicking your foot under the back bumper, leaving your hands completely free. The 911 doesn’t offer a hands-free gesture to open its trunk, forcing you to put cargo down if your hands are full.

Ergonomics Comparison

The M4 offers an optional heads-up display which projects speed and other key instrumentation readouts onto the windshield, allowing drivers to view information without diverting their eyes from the road. The 911 doesn’t offer a heads-up display.

If the front windows are left down on the M4 w/Comfort Access the driver can raise them using the key in the outside lock cylinder. On a hot day the driver can lower the windows from outside the vehicle using the key in the outside lock cylinder or the keyless remote. The driver of the 911 can only operate the windows from inside the vehicle, with the ignition on.

While driving with high beams on, sensitive light sensors available for the M4 detect other vehicles which could be blinded and automatically switch to low beams. The 911 doesn’t offer automatic dimming high beams.

A power rear sunshade is optional in the M4 to help block heat and glare for the rear passengers. The 911 doesn’t offer a rear sunshade.

The M4 has a standard center folding armrest for the rear passengers. A center armrest helps make rear passengers more comfortable. The 911 doesn’t offer a rear seat center armrest.

For greater rear passenger comfort, the M4 has standard rear a/c vents to keep rear occupants more comfortable. The 911 doesn’t offer rear vents.

The M4’s optional Parking Assistant can parallel park or back into a parking spot by itself, with the driver only controlling speed with the brake pedal. The 911 doesn’t offer an automated parking system.

Recommendations Comparison

Car and Driver performed a comparison test in its August 2014 issue and the BMW M4 Coupe won out over the Porsche 911 Coupe.

The 4 Series was chosen as one of Car and Driver’s “Top Ten” in 2014. The 911 has never been a Car and Driver “Top Ten” pick.

The M3/M4 was chosen as one of Automobile Magazine’s “All Stars” for 13 of the last 19 years. The 911 hasn’t been picked since 2009.

The M3/M4 was selected by Automobile Magazine as their 2006 Car of the Year. The 911 has never been chosen.

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