Certified Benz & Beemer Compares 2015 Porsche 911 VS 2015 Audi A5 Near Scottsdale, AZ

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2015 Porsche 911

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2015 Audi A5

Safety Comparison

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 A5 doesn't offer collision warning or crash mitigation brakes.

The 911 offers optional ParkAssist to help warn the driver about vehicles, pedestrians or other obstacles behind or, optionally, in front of the vehicle. The A5 doesn’t offer a front parking aid.

Both the 911 and the A5 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, electronic stability systems to prevent skidding and available all wheel drive.

Reliability Comparison

To reliably power the ignition and other systems and to recharge the battery, the 911 has a standard 175-amp alternator. The A5’s 150-amp alternator isn’t as powerful.

J.D. Power and Associates rated the 911 first among midsize premium sporty cars in their 2013 Initial Quality Study. The A5 isn’t in the top three in its category.

J.D. Power and Associates’ 2014 Initial Quality Study of new car owners surveyed provide the statistics that show that Porsche vehicles are better in initial quality than Audi vehicles. J.D. Power ranks Porsche first in initial quality, above the industry average. With 37 more problems per 100 vehicles, Audi is ranked 11th.

J.D. Power and Associates’ 2014 survey of the owners of three-year-old vehicles provides the long-term dependability statistics that show that Porsche vehicles are more reliable than Audi vehicles. J.D. Power ranks Porsche 9th in reliability, above the industry average. With 26 more problems per 100 vehicles, Audi is ranked 19th.

Engine Comparison

The 911’s standard 3.4 DOHC 6 cyl. produces 130 more horsepower (350 vs. 220) and 29 lbs.-ft. more torque (287 vs. 258) than the A5’s 2.0 turbo 4 cyl. The 911 S’ standard 3.8 DOHC 6 cyl. produces 180 more horsepower (400 vs. 220) and 67 lbs.-ft. more torque (325 vs. 258) than the A5’s 2.0 turbo 4 cyl. The 911 GTS’ standard 3.8 DOHC 6 cyl. produces 210 more horsepower (430 vs. 220) and 67 lbs.-ft. more torque (325 vs. 258) than the A5’s 2.0 turbo 4 cyl. The 911 GT3 Coupe’s standard 3.8 DOHC 6 cyl. produces 255 more horsepower (475 vs. 220) and 67 lbs.-ft. more torque (325 vs. 258) than the A5’s 2.0 turbo 4 cyl. The 911 Turbo S’ standard 3.8 turbo 6 cyl. produces 340 more horsepower (560 vs. 220) and 258 lbs.-ft. more torque (516 vs. 258) than the A5’s 2.0 turbo 4 cyl.

The flat cylinder configuration of the boxer engine in the 911 lowers its center of gravity, enhancing handling stability. The A5 doesn’t offer a boxer engine configuration.

Fuel Economy and Range Comparison

Regenerative brakes improve the 911’s fuel efficiency by converting inertia back into energy instead of wasting it. The A5 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 A5 doesn’t offer an automatic engine start/stop system.

The 911 GT3’s optional fuel tank has 7.6 gallons more fuel capacity than the A5 (23.7 vs. 16.1 gallons).

Brakes and Stopping Comparison

For better stopping power the 911’s brake rotors are larger than those on the A5:


911 S


Front Rotors

13 inches

13.4 inches

12.6 inches

Rear Rotors

13 inches

13 inches

11.8 inches

The 911’s standard front and rear disc brakes are vented to help dissipate heat for shorter stops with less fading. The rear discs on the A5 are solid, not vented.

The 911 offers optional heat-treated ceramic brake rotors, which last ten to twenty times as long as conventional cast iron rotors, don’t rust, don’t fade during repeated high speed braking, and their lighter weight contribute to better braking, handling and acceleration. The A5 doesn’t offer ceramic brake rotors.

The 911 stops much shorter than the A5:



80 to 0 MPH

190 feet

204 feet

Road & Track

70 to 0 MPH

135 feet

177 feet

Car and Driver

60 to 0 MPH

93 feet

109 feet

Motor Trend

Tires and Wheels Comparison

For better traction and acceleration, the 911 has larger standard rear tires than the A5 (285/35R19 vs. 245/40R18). The 911’s optional rear tires are larger than the largest rear tires available on the A5 (305/30R20 vs. 255/35R19).

The 911’s standard 285/35R19 rear tires provide better handling because they have a lower 35 series profile (height to width ratio) that provides a stiffer sidewall than the A5’s standard 40 series tires. The 911’s optional 295/30R20 rear tires have a lower 30 series profile than the A5’s optional 35 series tires.

For better ride, handling and brake cooling the 911 has standard 19-inch wheels. Smaller 18-inch wheels are standard on the A5. The 911’s optional 20-inch wheels are larger than the 19-inch wheels optional on the A5.

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 A5 doesn’t offer an active sway bar system.

The 911 offers an optional driver-adjustable suspension system. It allows the driver to choose between an extra-supple ride, reducing fatigue on long trips, or a sport setting, which allows maximum control for tricky roads. The A5’s suspension doesn’t offer adjustable shock absorbers.

The 911 S Coupe handles at .99 G’s, while the A5 Coupe pulls only .94 G’s of cornering force in a Road & Track skidpad test.

The 911 S Cabriolet handles at 1.03 G’s, while the A5 Cabriolet pulls only .87 G’s of cornering force in a Car and Driver skidpad test.

The 911 S Coupe goes through Road & Track’s slalom 5.2 MPH faster than the A5 Coupe (74.1 vs. 68.9 MPH).

The 911 S Cabriolet executes Motor Trend’s “Figure Eight” maneuver 3 seconds quicker than the A5 Cabriolet (23.7 seconds @ .88 average G’s vs. 26.7 seconds @ .68 average G’s).

For better maneuverability, the 911 Turbo/GT3’s turning circle is 2.6 feet tighter than the A5’s (34.8 feet vs. 37.4 feet). The 911’s turning circle is 1 foot tighter than the A5’s (36.4 feet vs. 37.4 feet).

Chassis Comparison

The Porsche 911 may be more efficient, handle and accelerate better because it weighs about 500 to 550 pounds less than the Audi A5.

The 911 is 5.3 inches shorter than the A5, making the 911 easier to handle, maneuver and park in tight spaces.

The design of the Porsche 911 amounts to more than styling. The 911 offers aerodynamic coefficients of drag from .29 to .33 Cd (depending on bodystyle and options). That is lower than the A5 (.32 to .34). A more efficient exterior helps the 911 go faster and keeps the interior quieter. It also helps the 911 get better fuel mileage.

Passenger Space Comparison

The 911 Coupe has .4 inches more front headroom and 4.5 inches more front legroom than the A5 Coupe.

Cargo Capacity Comparison

A low lift-over trunk design makes loading and unloading the 911 easier. The 911’s trunk lift-over height is 24.3 inches, while the A5 Cabriolet’s liftover is 26.1 inches. The A5 Coupe’s liftover is 26.2 inches.

Ergonomics Comparison

The 911’s optional easy entry system raises the steering wheel and glides the driver’s seat back when the door is unlocked or the ignition is switched off, making it easier for the driver to get in and out. The A5 doesn’t offer an easy entry system.

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 A5 does not have an oil pressure gauge.

Porsche Entry and Drive optional on the 911 allows you to unlock the driver’s door, trunk and start the engine all without removing a key from pocket or purse. This eliminates searching for keys before loading groceries, getting in the vehicle in bad weather or making a hurried start to your trip. The Audi A5’s available Audi Advanced Key doesn’t unlock the trunk.

To improve rear visibility by keeping the rear window clear, the 911 offers an optional rear wiper. The A5 doesn’t offer a rear wiper.

In poor weather, headlights can lose their effectiveness as grime builds up on their lenses. This can reduce visibility without the driver realizing. The 911 offers available headlight washers to keep headlight output high. The A5 doesn’t offer headlight washers.

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 A5’s mirror doesn’t automatically adjust for backing.

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 A5 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 A5 doesn’t offer a heated steering wheel.

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 A5 doesn’t offer factory integrated smartphone program access.

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 A5 was rated second in its category.

The 911 was chosen as one of Automobile Magazine’s “All Stars” for 6 of the last 19 years. The A5 has never been an “All Star.”

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