2011 Maserati GranCabrio

(from maserati press release)
The open-top GranCabrio is pure Maserati. It is a Maserati in the truest sense, with an unmistakable Pininfarina design, spacious interior, handcrafted details, driving pleasure and high performances. The Maserati GranCabrio touches all five senses in an open-air experience that retains all the typical comfort and performance brio. Like all Maserati’s open-top models, the GranCabrio is a special car intended for true connoisseurs. 

The GranCabrio continues in the footsteps of the Maserati tradition in open-top models, and adds to a line-up of models that has made the history of the Modena manufacturer, such as the 1950 A6G Frua Spyder, the 3500GT Vignale Spyder (1960), the Mistral Spyder (1964), the Ghibli Spyder (1968) and the 2001 Spyder, the car Maserati chose for his comeback to the United States.  

True to its tradition, the Maserati GranCabrio yet opens a new chapter, because never before have four-seater top-down models been produced at the Viale Ciro Menotti Maserati factory in Modena. There are four proper seats are provided, so that the rear passengers are not merely supporting actors, but co-stars of the journey. 

The Maserati GranCabrio is powered by a 4.7 liter V8 engine paired with the fluid 6-speed automatic transmission. In Sport mode, the V8 gives the driver and passengers the full power of its 323kW, with a thrilling roar that becomes even more exciting with the top down, as it becomes one with its surroundings. 

Completely re-engineered
The body of the Maserati GranCabrio has been thoroughly overhauled. Despite the lack of an overhead frame and a wheelbase at the top of its class (2.942mm: longer than its direct competitors) it guarantees the best possible performance in terms of structural rigidity. This enhances the smooth handling, safety and comfort of the car, and fully exploits the powerful, efficient mechanics. 
The newly-designed bearing monocoque has been made using materials and technologies designed especially to optimize weight: the bonnet and cross beams are made from aluminum, while the boot is made from SMC (Sheet Molding Compound).

The excellent weight distribution (with higher load at the rear) also facilitates excellent on-the-road dynamics and improved safety, in combination with the vehicle’s control systems. These include, for the first time ever, the Hydraulic Brake Assist (HBA), which optimizes brake performance both in frequent use and in emergency situations.

The new body took thousands of hours of calculations, testing and development. The result of all this work is a static rigidity at the top of its class (75000 DaN/m/rad) and dynamic torsional frequency of 27.2 Hz.

Particular attention has been paid to developing the aerodynamics, with the creation of a flat aluminum base that not only adds to the overall body’s rigidity but also reduces Cx by 6 points. In this way, for the first time, the convertible version of a car is able to maintain the same aerodynamic performance of the coupé, with a Cx of 0.35.

An all-round experience
Behind the wheel of the Maserati GranCabrio, driving fun combines with comfort and safety in all road conditions. With the longest wheelbase in its segment, the Maserati GranCabrio gives all passengers an extremely comfortable ride even on long journeys. Their safety is enhanced thanks to the extendable roll bars behind the rear seats, which are activated if necessary.

Passenger comfort onboard the Maserati GranCabrio also comes from the perfect integration between the vehicle’s hood and its main systems, guaranteeing maximum efficiency and drivability in all conditions. The automatic dual-zone climate control function optimizes the conditions inside the car, adjusting the internal temperature and the intensity of ventilation depending on the outside temperature, heat of the sun, and air humidity. 

By capitalizing on the close collaboration between Maserati engineers and BOSE technicians on the GranTurismo, the GranCabrio has been equipped with a BOSE audio system that adds another dimension to open-air music. 

The Maserati GranCabrio is fitted with Skyhook suspension as standard. The braking system uses high performance dual-cast technology, developed in collaboration with Brembo and already successfully employed on the GranTurismo and Quattroporte. 

The GranCabrio’s roof is strictly canvas-made, emphasizing the link with the Maserati tradition.
Aerodynamic, aero-acoustic efficiency and the desire to make the GranCabrio a car suitable for all year driving are the principles which led the Maserati technicians to develop a three-layer canvas hood. Not only does it offer ample opportunities for customization, but it also adds considerable benefits in terms of on-the-road dynamics, as the car’s centre of gravity is lower. In 28 seconds, passengers can enjoy the thrill of the open-air experience, activating the open/close mechanism even when the car is moving, at speeds of up to 30km/h.

The Maserati GranCabrio will be marketed this coming winter, and experienced by customers the world over from the following spring.

Clients and supporters of the brand can already choose contents and features of their own Maserati GranCabrio, thanks to a completely renewed car configurator which is state of the art in terms of image quality and flexibility of usage. The Maserati GranCabrio is also on the web with a dedicated minisite).

Technical specifications

Body

High-strength steel bearing monocoque with box-section panels and structure constructed in sheet galvanized, two-door cabriolet, four seats, longitudinal centre-front engine (between the two axles), rear wheel drive. 

Cx 0.35 with car closed and 0.39 with car open.
 
Monocoque  
Multi-material bearing monocoque, passive safety performance conforming to “worldwide” regulations, integration of various design technologies for weight/performance optimization: steel structural part, aluminum bonnet and bumper front reinforcement cross member, boot lid in thermosetting composite material.

Frame
Derived from the Quattroporte structure, with reduced wheelbase and rear overhang, designed to satisfy the most stringent American crash standards (FMVSS208, Federal Motor Vehicle Safety Standard), front structure compliant with ACEA1 “pedestrian impact” standards.
Constructed in high-strength steel boxed sections; it integrates a tubular structure in the rear part to support suspensions and differential; front serves to support the suspensions and engine.
Aluminum sub-floor structural reinforcements.


Suspension
Standard Skyhook system.
Front: quadrilateral with forged aluminum hub carriers and struts, basic aluminum gas dampers with continuous damping variation and acceleration sensors on each wheel (Skyhook), coaxial helical springs.
Rear: with quadrilaterals with forged aluminum hub carriers and struts, additional radius bar for toe-in control; basic aluminum dampers with continuous damping variation and acceleration sensors on each wheel (Skyhook).
Front and rear suspension fitted with hollow bars that reduce roll and mass, and increase driving comfort.


Steering
Hydraulic steering box with tacho-sensitive servo assistance with on road steering ratio 64 mm/rev.
Steering diameter (from pavement to pavement): 10.7 m.


Transmission 
Architecture with front transmission in unit with the engine, drive shaft, rear differential. 6-speed hydraulic torque converter gearbox (ZF 6HP26).

Transmission gear ratios: 1st gear 4,171; 2nd gear 2,340; 3rd gear 1,521; 4th gear 1,143; 5th gear 0,867; 6th gear 0,691; R 3,403.
Asymmetric limited slip differential (25% in traction, 45% in release) with bevel drive with final ratio 3.73 (15/56).

Steel drive shaft, 69 mm diameter, articulated in two pieces with three constant-velocity joints, and supported at the centre with a bearing which is integral with a support cross member tightened to the chassis, with an interposed rubber ring.

Traction control and Maserati Stability Program (MSP) incorporating the traction control (ASR), release torque (MSR), anti-lock braking (ABS), and electronic brake distribution (EBD) systems.


Engine
8 cylinders in 90 degree V, total displacement 4,691 cm3. Crankcase and cylinder heads in hardened and tempered aluminum alloy, crankshaft in hardened and tempered steel, balanced individually on 5 main bearings.
The timing system features double chain-driven overhead camshaft per bank; four valves per cylinder driven by hydraulic cups. 
Continuous phase variator on intake camshafts.
Increased-diameter Nikasil-coated thin steel cylinder liners. 
Wet sump lubrication, oil sump integral with crankcase, single oil bath pump.
Bosch integrated ignition and injection systems, and drive-by-wire accelerator.

Displacement: 4,691 cm3
Bore: 94 mm
Stroke: 84.5 mm
Compression ratio: 11.25:1
Maximum power output: 323 kW (440 CV)
Engine speed at maximum power output: 7,000 rpm
Peak torque: 490 Nm (50 kgm)
Engine speed at peak torque: 4,750 rpm
Maximum engine speed: 7,200 rpm
 
Dimensions and weight
Length: 4,881 mm 
Width (without mirrors): 1,915 mm
Width (with mirrors): 2,056 mm
Height: 1,353 mm 
Wheelbase: 2,942 mm 
Front track: 1,586 mm
Rear track: 1,590 mm
Front overhang: 873 mm 
Rear overhang: 1,066 mm 
Trunk capacity: 173 l
Fuel tank capacity: 75 l
Dry weight (UE version): 1,887 kg 
Kerb weight (UE version): 1,980 kg
Weight distribution: 49% front; 51% rear with car closed; 
48% front; 52% rear with car open

Performance
Top speed: 283 km/h with car closed
Acceleration 0-100 km/h: 5,4 s
Pick-up 80 -120 km/h: 4.2 s
Stopping distance from 100 Km/h – 0: 35 m
 

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