Bentley Continental GT Speed, 2008
Bentley Continental GT models is the Bentley 6-litre, twin turbocharged W12 engine, the most compact 12-cylinder engine in production. The 48-valve head employs four camshafts and continually variable valve-timing. Power is transmitted via a ZF six-speed automatic transmission.
A host of engine and transmission enhancements have been introduced on the 552bhp (560PS) Bentley Continental GT to enhance both the refinement and efficiency of this high technology powertrain.
These include:
* New crankcase design to reduce internal losses.
* More efficient catalyst and exhaust system for improved emissions.
* Lighter weight single chain drive for camshaft.
* New engine management system and faster response cam sensor.
For the Bentley Continental GT, the engine continues to produce 552bhp (560PS / 412kW) at 6100 rev/min and a maximum torque of 650Nm (479lb ft) from1600 rev/min. The twin, low-inertia turbochargers are a key factor in producing the flat torque curve, characteristic of every Bentley.
A new higher output of the W12 engine is specified for the Bentley Continental GT Speed, sharing engine efficiency improvements with the GT model. New lighter weight con rods enhance engine response, while new pistons, with anodised compression ring grooves, are designed to withstand increased cylinder pressures. Together with a recalibrated version of the new engine management system, the Bentley Continental GT Speed develops nine percent more power than the GT - 600bhp (610PS) at 6000 rev/min. The maximum torque of 750Nm (553lb ft) at 1750 rev/min represents an increase of over 15 percent versus the standard engine. As a result, the Bentley Continental GT Speed becomes the first production Bentley to top 200mph (322km/h), with a V-max of 202mph (326km/h).
Both the Bentley Continental GT Speed and GT models now produce lower CO2 emissions of 396g/km, down from 410g/km, an improvement of 3.5 percent. Fuel consumption is improved by a similar amount.
The advanced ZF 6HP26 six-speed automatic gearbox has the ability to lock up its torque converter during normal driving conditions replicating the immediacy of a manual transmission while maintaining the smoothness of an automatic. A manual override function allows clutchless manual changes via the gearlever or steering wheel paddles.
Providing huge levels of grip and stability in all weather conditions, the all-wheel drive system harnesses the prodigious power and torque of both the Bentley Continental GT and GT Speed coupes. The system uses a central Torsen differential and a differential on both the front and rear axles providing a standard 50:50 torque split. This front to rear ratio is variable depending on the available grip and the system can sense slip of less than one percent and react by apportioning the engine's torque to either the front or rear axle.
The advanced electronic stability programme (ESP) has been uprated to ESP 8.1 for both models. The Bentley Continental GT has a new "Sport Traction" mode that moderates ESP intervention at low speeds, providing a greater degree of driver interaction and control.
The Bentley Continental GT Speed owith a new 'Dynamic Mode' that allows increased wheel slip at higher speeds than the 'Sport Traction' mode on the standard chassis. Torque is reinstated more quickly after the traction control system is triggered, giving the spirited driver a greater sense of control and the ability to exploit the full potential of the new engine.
Highly tuned suspension for outstanding handling
Chassis, suspension and steering modifications for both the Bentley Continental GT and GT Speed models ensure they have the handling to match their formidable powertrains. Both are suspended on double wishbones at the front and a trapezoidal multi-link system at the rear. Much of the suspension is made from lightweight aluminium. The Bentley Continental GT Speed model also benefits from a solid-mounted front subframe, while high-stiffness aluminium front uprights are common to both models.
Self-levelling air suspension that constantly monitors and adjusts the ride height and damping according to road conditions is common to both models, although the Bentley Continental GT Speed is engineered to sit 10mm lower at the front and 15mm lower at the rear to improve handling dynamics. Uprated springs and dampers, together with revised software control, further improve the agility and body control of the Bentley Continental GT Speed.
All-new 9.5Jx20-inch alloy wheels with bespoke Pirelli P-Zero tyres have a major effect on the GT Speed's steering and grip levels. The wider wheel and reduced tyre wall profile improve the tyre's lateral stiffness giving noticeably sharper steering response and feel. The new Pirelli performance tyres are developed specifically for the Bentley Continental GT Speed and benefit from a unique construction and rubber compound for enhanced levels of grip.
Both the Bentley Continental GT and GT Speed benefit from changes to the rack and pinion steering. Revisions to the system's hydraulics reduce friction and improve steering feel, while a new version of the speed-sensitive Servotronic system also increases levels of feedback to the driver.
Secondary ride levels - the response of the car to poor road surfaces, pot holes or cats' eyes, for example - have been improved on the 552bhp Bentley Continental GT model with the addition of low friction dampers. The new Bentley Continental GT Speed has stiffer, lowered suspension its ride quality is on a par with the 2007 Bentley Continental GT.
The Bentley Continental GT and GT Speed are both equipped with the largest brakes of any production passenger car on sale today. The ventilated front discs have a 405mm diameter and are 36mm thick. Ventilated discs are also used at the back, with a diameter of 335mm and a thickness of 22mm.
The performance boundaries are further extended by Bentley's optional carbon/silicon carbide brake system. Boasting 420 x 40mm carbon-silicon carbide, cross-drilled front discs and 356 x 28mm rears, with eight-piston callipers, the new brakes are even larger than the standard system. The system provides a 20kg reduction in rotating and unsprung mass, benefiting steering response and handling.
The lightweight, fade-resistant braking system minimises disc distortion under high thermal conditions. Under normal driving conditions the brake discs will last the lifetime of the car. Furthermore, brake pad life is doubled compared with the standard braking system.
Complementing the braking systems of both Bentley Continental GT models are sophisticated safety systems, including Hydraulic Braking Assistance (HBA), anti-lock braking (ABS), drag torque control (MSR) and Electronic Brakeforce Distribution (EBD). The latter monitors the level of grip available to each tyre and apportions braking force accordingly. This not only helps reduce stopping distances but also greatly enhances the control enjoyed by the driver under heavy braking.
Subtle changes to acclaimed coupe design
The Bentley Continental GT has received many accolades for its distinctive, muscular and elegant style. It has redefined the concept of the contemporary Grand Touring coupe: forward looking yet faithful to Bentley's design heritage. Classic sculpted coupe design cues such as curvaceous rear haunches, short front overhang, prominent front grille and longer rear overhang echo the look and feel of some of the great Bentleys of yesteryear.
The principal changes to the frontal appearance are common to both the GT and the new GT Speed. The subtly revised front grille, now more vertical, has a more pronounced square edge accentuating the GT's distinctive Bentley profile. Beneath the grille, the all-new lower bumper design features a wider central air intake that emphasises the sporting stance of the new models. Chromed bezels around the headlamps complement the new frontal design.
The Bentley Continental GT Speed is distinguished from the Continental GT by its dark-tinted chrome matrix grille to the main and lower air intakes. Bright chromed grilles may be specified at no extra cost. At the rear, a black lower bumper valance and wider, rifled exhaust tailpipes emphasise the Bentley Continental GT Speed's sporting character, reinforced by new multi-spoke 20-inch sports alloy wheels. As an option, these may be specified with a dark chromed finish.
The Bentley Continental GT Speed's cabin is based on that of the Mulliner Driving Specification (a cost option on the standard GT).
A host of engine and transmission enhancements have been introduced on the 552bhp (560PS) Bentley Continental GT to enhance both the refinement and efficiency of this high technology powertrain.
These include:
* New crankcase design to reduce internal losses.
* More efficient catalyst and exhaust system for improved emissions.
* Lighter weight single chain drive for camshaft.
* New engine management system and faster response cam sensor.
For the Bentley Continental GT, the engine continues to produce 552bhp (560PS / 412kW) at 6100 rev/min and a maximum torque of 650Nm (479lb ft) from1600 rev/min. The twin, low-inertia turbochargers are a key factor in producing the flat torque curve, characteristic of every Bentley.
A new higher output of the W12 engine is specified for the Bentley Continental GT Speed, sharing engine efficiency improvements with the GT model. New lighter weight con rods enhance engine response, while new pistons, with anodised compression ring grooves, are designed to withstand increased cylinder pressures. Together with a recalibrated version of the new engine management system, the Bentley Continental GT Speed develops nine percent more power than the GT - 600bhp (610PS) at 6000 rev/min. The maximum torque of 750Nm (553lb ft) at 1750 rev/min represents an increase of over 15 percent versus the standard engine. As a result, the Bentley Continental GT Speed becomes the first production Bentley to top 200mph (322km/h), with a V-max of 202mph (326km/h).
Both the Bentley Continental GT Speed and GT models now produce lower CO2 emissions of 396g/km, down from 410g/km, an improvement of 3.5 percent. Fuel consumption is improved by a similar amount.
The advanced ZF 6HP26 six-speed automatic gearbox has the ability to lock up its torque converter during normal driving conditions replicating the immediacy of a manual transmission while maintaining the smoothness of an automatic. A manual override function allows clutchless manual changes via the gearlever or steering wheel paddles.
Providing huge levels of grip and stability in all weather conditions, the all-wheel drive system harnesses the prodigious power and torque of both the Bentley Continental GT and GT Speed coupes. The system uses a central Torsen differential and a differential on both the front and rear axles providing a standard 50:50 torque split. This front to rear ratio is variable depending on the available grip and the system can sense slip of less than one percent and react by apportioning the engine's torque to either the front or rear axle.
The advanced electronic stability programme (ESP) has been uprated to ESP 8.1 for both models. The Bentley Continental GT has a new "Sport Traction" mode that moderates ESP intervention at low speeds, providing a greater degree of driver interaction and control.
The Bentley Continental GT Speed owith a new 'Dynamic Mode' that allows increased wheel slip at higher speeds than the 'Sport Traction' mode on the standard chassis. Torque is reinstated more quickly after the traction control system is triggered, giving the spirited driver a greater sense of control and the ability to exploit the full potential of the new engine.
Highly tuned suspension for outstanding handling
Chassis, suspension and steering modifications for both the Bentley Continental GT and GT Speed models ensure they have the handling to match their formidable powertrains. Both are suspended on double wishbones at the front and a trapezoidal multi-link system at the rear. Much of the suspension is made from lightweight aluminium. The Bentley Continental GT Speed model also benefits from a solid-mounted front subframe, while high-stiffness aluminium front uprights are common to both models.
Self-levelling air suspension that constantly monitors and adjusts the ride height and damping according to road conditions is common to both models, although the Bentley Continental GT Speed is engineered to sit 10mm lower at the front and 15mm lower at the rear to improve handling dynamics. Uprated springs and dampers, together with revised software control, further improve the agility and body control of the Bentley Continental GT Speed.
All-new 9.5Jx20-inch alloy wheels with bespoke Pirelli P-Zero tyres have a major effect on the GT Speed's steering and grip levels. The wider wheel and reduced tyre wall profile improve the tyre's lateral stiffness giving noticeably sharper steering response and feel. The new Pirelli performance tyres are developed specifically for the Bentley Continental GT Speed and benefit from a unique construction and rubber compound for enhanced levels of grip.
Both the Bentley Continental GT and GT Speed benefit from changes to the rack and pinion steering. Revisions to the system's hydraulics reduce friction and improve steering feel, while a new version of the speed-sensitive Servotronic system also increases levels of feedback to the driver.
Secondary ride levels - the response of the car to poor road surfaces, pot holes or cats' eyes, for example - have been improved on the 552bhp Bentley Continental GT model with the addition of low friction dampers. The new Bentley Continental GT Speed has stiffer, lowered suspension its ride quality is on a par with the 2007 Bentley Continental GT.
The Bentley Continental GT and GT Speed are both equipped with the largest brakes of any production passenger car on sale today. The ventilated front discs have a 405mm diameter and are 36mm thick. Ventilated discs are also used at the back, with a diameter of 335mm and a thickness of 22mm.
The performance boundaries are further extended by Bentley's optional carbon/silicon carbide brake system. Boasting 420 x 40mm carbon-silicon carbide, cross-drilled front discs and 356 x 28mm rears, with eight-piston callipers, the new brakes are even larger than the standard system. The system provides a 20kg reduction in rotating and unsprung mass, benefiting steering response and handling.
The lightweight, fade-resistant braking system minimises disc distortion under high thermal conditions. Under normal driving conditions the brake discs will last the lifetime of the car. Furthermore, brake pad life is doubled compared with the standard braking system.
Complementing the braking systems of both Bentley Continental GT models are sophisticated safety systems, including Hydraulic Braking Assistance (HBA), anti-lock braking (ABS), drag torque control (MSR) and Electronic Brakeforce Distribution (EBD). The latter monitors the level of grip available to each tyre and apportions braking force accordingly. This not only helps reduce stopping distances but also greatly enhances the control enjoyed by the driver under heavy braking.
Subtle changes to acclaimed coupe design
The Bentley Continental GT has received many accolades for its distinctive, muscular and elegant style. It has redefined the concept of the contemporary Grand Touring coupe: forward looking yet faithful to Bentley's design heritage. Classic sculpted coupe design cues such as curvaceous rear haunches, short front overhang, prominent front grille and longer rear overhang echo the look and feel of some of the great Bentleys of yesteryear.
The principal changes to the frontal appearance are common to both the GT and the new GT Speed. The subtly revised front grille, now more vertical, has a more pronounced square edge accentuating the GT's distinctive Bentley profile. Beneath the grille, the all-new lower bumper design features a wider central air intake that emphasises the sporting stance of the new models. Chromed bezels around the headlamps complement the new frontal design.
The Bentley Continental GT Speed is distinguished from the Continental GT by its dark-tinted chrome matrix grille to the main and lower air intakes. Bright chromed grilles may be specified at no extra cost. At the rear, a black lower bumper valance and wider, rifled exhaust tailpipes emphasise the Bentley Continental GT Speed's sporting character, reinforced by new multi-spoke 20-inch sports alloy wheels. As an option, these may be specified with a dark chromed finish.
The Bentley Continental GT Speed's cabin is based on that of the Mulliner Driving Specification (a cost option on the standard GT).
