Certified Benz & Beemer Compares 2015 Porsche 911 VS 2015 Aston Martin Near Scottsdale, AZ

Responsive image

2015 Porsche 911

Responsive image

2015 Aston Martin

Safety Comparison

The 911 has standard head airbag curtains which act as a forgiving barrier between the driver and front passenger's upper bodies and the window and pillars. Combined with high-strength steel door beams and lower side airbags this system increases head protection in broadside collisions. The DB9 doesn't offer side airbag protection for the head.

The 911 offers optional Porsche Active Safe, which use forward mounted sensors to warn the driver of a possible collision ahead. If the driver doesn’t react and the system determines a collision is imminent, it automatically applies the brakes at full-force in order to reduce the force of the crash or avoid it altogether. The DB9 doesn't offer collision warning or crash mitigation brakes.

The 911 offers all-wheel drive to maximize traction under poor conditions, especially in ice and snow. The DB9 doesn’t offer all-wheel drive.

Both the 911 and the DB9 have standard driver and passenger frontal airbags, front side-impact airbags, front seatbelt pretensioners, four-wheel antilock brakes, traction control and electronic stability systems to prevent skidding.

Warranty Comparison

The 911 comes with a full 4 year/50,000 mile basic warranty, which covers the entire car and includes 24 hour roadside assistance. The DB9’s 3 year basic warranty expires 1 year sooner.

There are almost 17 times as many Porsche dealers as there are Aston Martin dealers, which makes it much easier should you ever need service under the 911’s warranty.

Reliability Comparison

J.D. Power and Associates rated the 911 first among midsize premium sporty cars in their 2013 Initial Quality Study. The DB9 isn’t in the top three in its category.

Engine Comparison

The 911 Turbo S’ standard 3.8 turbo 6 cyl. produces 50 more horsepower (560 vs. 510) and 59 lbs.-ft. more torque (516 vs. 457) than the DB9’s 5.9 DOHC V12.

The flat cylinder configuration of the boxer engine in the 911 lowers its center of gravity, enhancing handling stability. The DB9 doesn’t offer a boxer engine configuration.

Fuel Economy and Range Comparison

On the EPA test cycle the 911 gets better fuel mileage than the DB9:





15 city/20 hwy

13 city/19 hwy




17 city/24 hwy


Turbo S/Auto

17 city/24 hwy


Regenerative brakes improve the 911’s fuel efficiency by converting inertia back into energy instead of wasting it. The DB9 doesn’t offer a regenerative braking system.

In heavy traffic or at stoplights the 911 (except GT3)’s engine automatically turns off when the vehicle is stopped, saving fuel and reducing pollution. The engine is automatically restarted when the driver gets ready to move again. (Start/Stop isn’t accounted in present EPA fuel mileage tests.) The DB9 doesn’t offer an automatic engine start/stop system.

The 911 GT3’s optional fuel tank has 3.1 gallons more fuel capacity than the DB9 (23.7 vs. 20.6 gallons).

Brakes and Stopping Comparison

For better stopping power the 911 Turbo/GT3’s optional brake rotors are larger than those on the DB9:

911 Turbo/GT3


Front Rotors

16.1 inches

15.7 inches

Rear Rotors

15.4 inches

14.2 inches

Suspension and Handling Comparison

The 911 offers active sway bars, which help keep it flat and controlled during cornering, but disconnect at lower speeds to smooth the ride. This helps keep the tires glued to the road. The DB9 doesn’t offer an active sway bar system.

The 911 GT3 Coupe handles at 1.12 G’s, while the DB9 Coupe pulls only .90 G’s of cornering force in a Car and Driver skidpad test.

The 911 S Coupe goes through Road & Track’s slalom 8.6 MPH faster than the DB9 Coupe (74.1 vs. 65.5 MPH).

For better maneuverability, the 911 Turbo/GT3’s turning circle is 2.9 feet tighter than the DB9’s (34.8 feet vs. 37.7 feet). The 911’s turning circle is 1.3 feet tighter than the DB9’s (36.4 feet vs. 37.7 feet).

Chassis Comparison

The Porsche 911 may be more efficient, handle and accelerate better because it weighs about 450 to 900 pounds less than the Aston Martin DB9.

The 911 is 9 inches shorter than the DB9, making the 911 easier to handle, maneuver and park in tight spaces.

To almost totally eliminate engine vibration in the passenger area, the 911 w/Sport Chrono (except w/o Sport Chrono) 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 DB9 uses conventional solid rubber engine mounts.

Passenger Space Comparison

The 911 Coupe has 1.3 inches more front headroom, 3 inches more front legroom and .1 inches more rear legroom than the DB9 Coupe.

Ergonomics Comparison

The 911’s instruments include an oil pressure gauge and a temperature gauge – which could save your engine! Often ‘idiot lights’ don’t warn you until damage has been done. The DB9 does not have an oil pressure gauge.

To help drivers see further while navigating curves, the 911 offers optional adaptive headlights to illuminate around corners automatically by reading vehicle speed and steering wheel angle. The DB9 doesn’t offer cornering lights.

When the 911 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 DB9’s mirror doesn’t automatically adjust for backing.

The 911 offers optional automatic dimming rear and side view mirrors which automatically darken quickly when headlights shine on them, keeping following vehicles from blinding or distracting the driver. The DB9 has an automatic rear view mirror, but its side mirrors don’t dim.

The 911’s optional air conditioned front seats cool the driver and front passenger and help take the sting out of hot leather in Summer. The DB9 doesn’t offer air conditioned front seats.

On extremely cold Winter days, the 911’s optional heated steering wheel provides comfort, allowing the driver to steer safely and comfortably before the car heater warms up. The DB9 doesn’t offer a heated steering wheel.

The 911’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 DB9 doesn’t offer dual zone air conditioning.

To keep a safe, consistent following distance, the 911 PDK offers an optional Adaptive 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 DB9 doesn’t offer an adaptive cruise control.

Optional Online Services for the 911 allows the driver and passengers access to select programs on their smartphones, including playing internet radio stations, searching the internet and other connected activities without taking their eyes off the road or their hands from the wheel. The DB9 doesn’t offer factory integrated smartphone program access.

With optional voice command, the 911 offers the driver hands free control of the radio, cell phone and the navigation computer by simply speaking. The DB9 doesn’t offer a voice control system.

Recommendations Comparison

J.D. Power and Associates rated the 911 first among midsize premium sporty cars in owner reported satisfaction. This includes how well the vehicle performs and satisfies its owner’s expectations. The DB9 isn’t in the top three.

The 911 was chosen as one of Automobile Magazine’s “All Stars” for 6 of the last 19 years. The DB9 has never been an “All Star.”

© 1991-2016 Advanta-STAR Automotive Research. All rights reserved. Who We Are
Click here to view the disclaimers, limitations and notices about EPA fuel mileage, crash tests, coprights, trademarks, and other issues.