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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 GranTurismo Convertible doesn't offer collision warning or crash mitigation brakes.
The 911 has a standard automatic post-collision braking system, which automatically applies the brakes in the event of a crash to help prevent secondary collisions and prevent further injuries. The GranTurismo Convertible doesn’t offer a post collision braking system: in the event of a collision that triggers the airbags, more collisions are possible without the protection of airbags that may have already deployed.
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.
The 911’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 GranTurismo Convertible doesn’t offer a system to reveal objects in the driver’s blind spots.
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.
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.
To reliably power the ignition and other systems and to recharge the battery, the 911 has a standard 204-amp alternator (245-amp - 911 S and 175 Turbo). The GranTurismo Convertible’s 150-amp alternator isn’t as powerful.
The 911 GTS’ standard 3.0 turbo 6 cyl. produces 21 lbs.-ft. more torque (405 vs. 384) than the GranTurismo Convertible’s 4.7 DOHC V8. The 911 GT3’s standard 4.0 DOHC 6 cyl. produces 46 more horsepower (500 vs. 454) than the GranTurismo Convertible’s 4.7 DOHC V8. The 911 GT2 RS’ standard 3.8 turbo 6 cyl. produces 246 more horsepower (700 vs. 454) and 169 lbs.-ft. more torque (553 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.
On the EPA test cycle the 911 S RWD Auto 3.0 twin turbo 6 cyl. (420 HP) gets better fuel mileage than the GranTurismo Convertible Auto (22 city/28 hwy vs. 13 city/20 hwy).
Regenerative brakes improve the 911’s fuel efficiency by converting inertia back into energy instead of wasting it. The GranTurismo Convertible doesn’t offer a regenerative braking system.
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.
The 911 GT2 RS’ optional fuel tank has 3.9 gallons more fuel capacity than the GranTurismo Convertible (23.7 vs. 19.8 gallons).
A seven-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 PDK’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.
For better stopping power the 911’s brake rotors are larger than those on the GranTurismo Convertible:
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:
70 to 0 MPH
Car and Driver
For better traction, the 911 GT2 RS/GT3 RS’ tires are larger than the largest tires available on the GranTurismo Convertible (F:265/35R20 & R:325/30R21 vs. F:245/35R20 & R:285/35R20).
The 911’s optional 305/30R20 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 GT2 RS/GT3 RS has standard 21-inch rear wheels. The GranTurismo Convertible’s largest wheels are only 20-inches.
The 911 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.
The 911 has a standard automatic front and rear load leveling suspension to keep ride height level with a heavy load or when towing. The GranTurismo Convertible doesn’t offer a load leveling suspension.
For better maneuverability, the 911 GT2 RS’ turning circle is 6.8 feet tighter than the GranTurismo Convertible’s (33.6 feet vs. 40.4 feet). The 911’s turning circle is 4 feet tighter than the GranTurismo Convertible’s (36.4 feet vs. 40.4 feet).
The Porsche 911 may be more efficient, handle and accelerate better because it weighs about 700 to 1250 pounds less than the Maserati GranTurismo Convertible.
The 911 is 1 foot, 4.2 inches shorter than the GranTurismo Convertible, making the 911 easier to handle, maneuver and park in tight spaces.
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.
The 911’s standard rear seats fold to accommodate long and bulky cargo. The GranTurismo Convertible doesn’t offer folding rear seats.
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 GranTurismo Convertible does not have an oil pressure gauge.
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.
Porsche Entry and Drive optional on the 911 allows you to unlock the driver’s door and start the engine all without removing a key from pocket or purse. This eliminates searching for keys before getting in the vehicle in bad weather or making a hurried start to your trip. 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.
Consumer Reports® recommends the Porsche 911, based on reliability, safety and performance.
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 GranTurismo Convertible isn’t in the top three.
The 911 Carrera GTS was chosen as one of Automobile Magazine’s “All Stars” in 2018. The GranTurismo Convertible has never been an “All Star.”
© 1991-2018 Advanta-STAR Automotive Research. All rights reserved.
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