The heart of the Maserati GranTurismo Convertible is a powerful V8 engine featuring a 4.7 liter displacement and delivering 433 bhp at 7,000 rpm with a maximum torque of 361 ft-lb at 4,750 rpm. The engine cylinder bank is designed with an angle of 90° and valve timing actuated by two chain-driven overhead camshafts per bank with four valves per cylinder controlled by hydraulic tappets. The intake side camshafts are fitted with a low pressure continuous phase timing variator, which changes the valve opening process for optimal performance in as little as 0.15 seconds to increase the engine response. The timing chain design also makes the engine exceptionally reliable and quiet, with very low friction levels for reduced fuel consumption, as well as the capability for precision timing reflected in excellent cylinder filing capacity yielding top performance.
Maserati GranTurismo convertible braking system has two circuits with four ventilated and perforated discs. The front axle mounts unibloc aluminum calipers which are more resistant to deformation than traditional two-piece calipers. Each front caliper has six pistons with different diameters and dual cast discs measuring 14.2in by 1.26 in. The rear axle has aluminum calipers with four pistons each with different diameters and 13. In x 1.1 inch cast iron discs.
The ABS system integrates an improved Electronic Brake Force Distribution system for improved braking between the front and rear wheels. The Maserati GranTurismo offers impressive performance in its brake’ capabilities and in their resistance to fade under intense use: the car boasts a stopping distance of just 114 feet from 60 mph to 0 mph with exceptionally high average deceleration rate of 1.24g.
To improve uphill start the transmission employs a Hill Holder System, which it is designed to keep the vehicle braked for few seconds after the brake pedal is released on uphill slopes, thus enabling the driver to shift over the accelerator pedal without the vehicle moving back. The Maserati GranTurismo convertible is equipped with a convenient and simple electronic parking brake, which is automatically engaged when the car is in park and the ignition is shut off. The car also features the Hydraulic Brake Assist System, a first for Maserati. It recognizes panic situations by analyzing a combination of parameters such as the power brake pressure gradient, the wheel speed and illumination of the third stop light. The system monitors these parameters and takes over from the driver in activating the brake system at full power to ensure that full braking force is used under critical conditions.
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