2020 Porsche 911 vs. 2019 Maserati GranTurismo Convertible

Detailed Review, Specifications & Comparison

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Safety

© 1999 - 2019 Advanta-STAR Automotive Research. All rights reserved. This vehicle comparison and all of the content in it are provided only by license from Advanta-STAR Automotive Research Corporation of America. If you are not a legally licensed user of this vehicle comparison, it is against federal law to access it, copy it, forward it or use it in any manner whatsoever. Any unauthorized use of this vehicle comparison is a violation of U.S. and international law and is punishable criminally and civilly. 6IUEX-0KENZ 45.55.47.189 2019/11/21

The 911 has standard Warn and Brake Assist, 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 GranTurismo Convertible 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 GranTurismo Convertible doesn’t offer all-wheel drive.

A passive infrared night vision system optional on the 911 helps the driver to more easily detect people, animals or other objects in front of the vehicle at night. Using an infrared camera to detect heat, the system then displays the image on a monitor in the dashboard. The GranTurismo Convertible doesn’t offer a night vision system.

The 911’s optional lane departure warning system alerts a temporarily inattentive driver when the vehicle begins to leave its lane and gently nudges the vehicle back towards its lane. The GranTurismo Convertible doesn’t offer a lane departure warning system.

The 911 offers an optional Surround View to allow the driver to see objects all around the vehicle on a screen. The GranTurismo Convertible only offers front and rear parking sensors that beep or flash a light. That doesn’t help with obstacles to the sides.

The 911 has standard Porsche Connect, 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 GranTurismo Convertible 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 911 and the GranTurismo Convertible 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, daytime running lights and front and rear parking sensors.

Warranty

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The 911’s corrosion warranty is 8 years and unlimited miles longer than the GranTurismo Convertible’s (12/unlimited vs. 4/50,000).

There are over 61 percent more Porsche dealers than there are Maserati dealers, which makes it much easier should you ever need service under the 911’s warranty.

Engine

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The 911 S’ standard 3.0 turbo 6-cylinder produces 6 lbs.-ft. more torque (390 vs. 384) than the GranTurismo Convertible’s 4.7 DOHC V8.

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

Fuel Economy and Range

© 1999 - 2019 Advanta-STAR Automotive Research. All rights reserved. This vehicle comparison and all of the content in it are provided only by license from Advanta-STAR Automotive Research Corporation of America. If you are not a legally licensed user of this vehicle comparison, it is against federal law to access it, copy it, forward it or use it in any manner whatsoever. Any unauthorized use of this vehicle comparison is a violation of U.S. and international law and is punishable criminally and civilly. 6IUEX-0KENZ 45.55.47.189 2019/11/21

On the EPA test cycle the 911 Cabriolet gets better fuel mileage than the GranTurismo Convertible:

MPG

911

RWD

S 3.0 turbo 6-cyl.

18 city/23 hwy

AWD

4S 3.0 turbo 6-cyl.

18 city/23 hwy

GranTurismo Convertible

RWD

S 2.0 turbo 4-cyl.

13 city/20 hwy

In heavy traffic or at stoplights the 911’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 GranTurismo Convertible doesn’t offer an automatic engine start/stop system.

Transmission and Drivetrain

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An eight-speed automatic (SMG) is available on the Porsche 911, for better acceleration and lower engine speed on the highway. Only a six-speed automatic is available for the GranTurismo Convertible.

All wheel drive, available in the 911, provides the best traction for acceleration in wet, dry, and icy conditions. In corners, all wheel drive allows both outside wheels to provide power, balancing the car. This allows for better handling. The Maserati GranTurismo Convertible is not available with all wheel drive.

The 911’s optional launch control uses engine electronics to hold engine RPM’s precisely in order to provide the most stable and rapid acceleration possible, using all of the available traction. The GranTurismo Convertible doesn’t offer launch control.

Brakes and Stopping

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

911

GranTurismo

Front Rotors

16.1 inches

14.2 inches

Rear Rotors

15.4 inches

13 inches

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 GranTurismo Convertible doesn’t offer ceramic brake rotors.

The 911 stops much shorter than the GranTurismo Convertible:

911

GranTurismo

70 to 0 MPH

140 feet

150 feet

Car and Driver

Tires and Wheels

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For better traction and acceleration, the 911 has larger standard rear tires than the GranTurismo Convertible (295/35R20 vs. 285/35R20). The 911’s optional rear tires are larger than the largest rear tires available on the GranTurismo Convertible (305/30R21 vs. 285/35R20).

The 911’s optional 305/30R21 rear tires provide better handling because they have a lower 30 series profile (height to width ratio) that provides a stiffer sidewall than the GranTurismo Convertible’s 35 series tires.

For better ride, handling and brake cooling the 911 offers optional 21-inch rear wheels. The GranTurismo Convertible’s largest wheels are only 20-inches.

Suspension and Handling

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The 911 S offers active sway bars, which help keep it flat and controlled during cornering, but disconnect at lower speeds to smooth the ride and offer greater off-road suspension articulation. This helps keep the tires glued to the road on-road and off. The GranTurismo Convertible doesn’t offer an active sway bar system.

For better maneuverability, the 911’s turning circle is 3.6 feet tighter than the GranTurismo Convertible’s (36.8 feet vs. 40.4 feet).

Chassis

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The Porsche 911 may be more efficient, handle and accelerate better because it weighs about 700 to 1000 pounds less than the Maserati GranTurismo Convertible.

The 911 is 1 foot, 3.4 inches shorter than the GranTurismo Convertible, 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 has an aerodynamic coefficient of drag of .31 Cd. That is lower than the GranTurismo Convertible (.33). A more efficient exterior helps the 911 go faster and keeps the interior quieter. It also helps the 911 get better fuel mileage.

The front grille of the 911 uses electronically controlled shutters to close off airflow and reduce drag when less engine cooling is needed. This helps improve highway fuel economy. The GranTurismo Convertible doesn’t offer active grille shutters.

Cargo Capacity

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The 911’s standard rear seats fold to accommodate long and bulky cargo. The GranTurismo Convertible doesn’t offer folding rear seats.

Ergonomics

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The 911’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 GranTurismo Convertible’s rear power window switches have to be held the entire time to open or close them fully.

Keyless Go standard on the 911 allows you to start the engine without removing a key from pocket or purse. The Maserati GranTurismo Convertible doesn’t offer an advanced key system.

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

Optional air-conditioned seats in the 911 keep the driver and front passenger comfortable and take the sting out of hot seats in summer. The GranTurismo Convertible doesn’t offer air-conditioned 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 GranTurismo Convertible doesn’t offer a heated steering wheel.

To keep a safe, consistent following distance, the 911 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 GranTurismo Convertible doesn’t offer an adaptive cruise control.

The 911’s standard separate stalk mounted cruise control is close at hand. The GranTurismo Convertible’s standard cruise control is on an over-crowded turn signal stalk.

Model Availability

© 1999 - 2019 Advanta-STAR Automotive Research. All rights reserved. This vehicle comparison and all of the content in it are provided only by license from Advanta-STAR Automotive Research Corporation of America. If you are not a legally licensed user of this vehicle comparison, it is against federal law to access it, copy it, forward it or use it in any manner whatsoever. Any unauthorized use of this vehicle comparison is a violation of U.S. and international law and is punishable criminally and civilly. 6IUEX-0KENZ 45.55.47.189 2019/11/21

The Porsche 911 comes in coupe and convertible bodystyles; the Maserati GranTurismo isn’t available as a coupe.

© 1991-2018 Advanta-STAR Automotive Research. All rights reserved.

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