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The R8 has all-wheel drive to maximize traction under poor conditions, especially in ice and snow. The GranTurismo Convertible doesn’t offer all-wheel drive.
The R8 has standard Audi Connect CARE, which uses a global positioning satellite (GPS) receiver and a cellular system to 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 R8 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 R8’s corrosion warranty is 8 years and unlimited miles longer than the GranTurismo Convertible’s (12/unlimited vs. 4/50,000).
There are almost 3 times as many Audi dealers as there are Maserati dealers, which makes it much easier should you ever need service under the R8’s warranty.
To reliably power the ignition and other systems and to recharge the battery, the R8 has a standard 210-amp alternator. The GranTurismo Convertible’s 150-amp alternator isn’t as powerful.
The R8 V10’s standard 5.2 DOHC V10 produces 108 more horsepower (562 vs. 454) and 22 lbs.-ft. more torque (406 vs. 384) than the GranTurismo Convertible’s 4.7 DOHC V8. The R8 V10 Performance/Decennium’s standard 5.2 DOHC V10 produces 148 more horsepower (602 vs. 454) and 29 lbs.-ft. more torque (413 vs. 384) than the GranTurismo Convertible’s 4.7 DOHC V8.
In heavy traffic or at stoplights the R8’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 R8’s standard fuel tank has 2.1 gallons more fuel capacity than the GranTurismo Convertible (21.9 vs. 19.8 gallons).
The R8 has a standard cap-less fueling system. The fuel filler is automatically opened when the fuel nozzle is inserted and automatically closed when it’s removed. This eliminates the need to unscrew and replace the cap and it reduces fuel evaporation, which causes pollution. The GranTurismo Convertible doesn’t offer a cap-less fueling system.
A seven-speed automatic (SMG) is standard on the Audi R8, 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 R8, 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.
For better stopping power the R8’s brake rotors are larger than those on the GranTurismo Convertible:
The R8 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.
For better traction and acceleration, the R8 has larger standard rear tires than the GranTurismo Convertible (295/35R19 vs. 285/35R20). The R8’s optional rear tires are larger than the largest rear tires available on the GranTurismo Convertible (305/30R20 vs. 285/35R20).
The R8’s optional 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 handling and stability, the track (width between the wheels) on the R8 is 2.4 inches wider in the front and .4 inches wider in the rear than on the GranTurismo Convertible.
For better maneuverability, the R8’s turning circle is 3.7 feet tighter than the GranTurismo Convertible’s (36.7 feet vs. 40.4 feet).
The Audi R8 may be more efficient, handle and accelerate better because it weighs about 700 to 850 pounds less than the Maserati GranTurismo Convertible.
The R8 is 1 foot, 6.9 inches shorter than the GranTurismo Convertible, making the R8 easier to handle, maneuver and park in tight spaces.
If the windows are left open on the R8 the driver can close them all at the outside door handle. On a hot day the driver can lower the windows at the outside door handle or from a distance using the keyless remote. The driver of the GranTurismo Convertible can’t use the remote to operate the windows.
Audi Advanced Key standard on the R8 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 Maserati GranTurismo Convertible doesn’t offer an advanced key system.
While driving with high beams on, sensitive light sensors standard on the R8 detect other vehicles which could be blinded and automatically switch to low beams. The GranTurismo Convertible doesn’t offer automatic dimming high beams.
The R8’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.
The Audi R8 comes in coupe and convertible bodystyles; the Maserati GranTurismo isn’t available as a coupe.
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