hp per liter
(from Bentley Press
Release) Bentley Motors continues the intensive
development of its flagship Arnage range with the introduction of a
major programme of powertrain and chassis enhancements for the 2007
Model Year. The Arnage’s renowned 6.75-litre V8 engine now develops
up to 500bhp and is mated to a six-speed automatic transmission
benefiting performance, driving dynamics and refinement. The
powertrain changes are complemented by subtle exterior, interior and
under-bonnet design cues.
Key to this performance
increase is the most powerful version of Bentley’s legendary V8
engine ever built at the company’s headquarters in Crewe, England.
In the performance-oriented Arnage T model, the revised
twin-turbocharged V8 engine produces a staggering 500bhp and 1000Nm
of torque – an 11percent increase in power and a 14 percent increase
in torque over the outgoing model. Twinned with the latest six-speed
ZF automatic transmission, which uses state-of-the-art computer
management, performance and refinement are optimised at all speeds.
In the Arnage R and RL models the new engine is boosted from 400 to
450bhp, while torque climbs from 835 to 875Nm.
“The 2007 Model Year Arnage range is clear evidence of our intent to
ensure Bentley’s flagship model remains at the forefront of
technology and delivers the performance, refinement and luxury that
every Bentley customer demands,” explains Stuart McCullough, Member
of the Board, Sales and Marketing.
The 500bhp Arnage T is a true driver’s car with much higher
performance and delivers an even more rewarding driving experience.
The improvements to the refinement and comfort of the 450bhp Arnage
R are equally striking, while the long-wheelbase RL shares the same
increased power output together with major improvements to the rear
“Two years ago we introduced major upgrades to the Arnage’s chassis,
steering and brakes,” says Dr Ulrich Eichhorn, Member of the Board,
Engineering. “Those improvements meant the car could easily handle a
significant increase in power and torque, so work began on this
important powertrain programme.”
The 2007 Model Year Arnage also benefits from safety, interior and
design improvements. Every Arnage now has a Tyre Pressure Monitoring
System, rSAP Bluetooth integrated telephone system and improved
driver ergonomics as standard. Additionally, new wheel, exterior
paint colour and interior trim options are available, as well as an
optional retractable ‘Flying B’ bonnet mascot.
The new 2007 Model Year Bentley Arnage range will go on sale from
twin-turbocharged V8 engine in Arnage T produces 500bhp and
1000Nm torque, thanks to new low inertia turbochargers and
roller tappet system.
Arnage R and RL
models uprated to 450bhp and 875Nm of torque.
Latest six-speed ZF
automatic transmission with sophisticated locking torque
converter provides fast yet ultra-smooth gearshifts.
Stability Programme (ESP) logic system improves dynamic response
and handling with less intrusive intervention when a reduction
in grip is detected.
New Tyre Pressure
Monitoring System fitted as standard to all Arnage models.
ergonomics thanks to 25mm increase in length of steering column
and in vertical steering wheel adjustment.
styling changes includes new dark finish to Arnage T front
radiator and bumper grilles, standardised bright chrome finish
to R and RL grilles, and Bentley ‘B’ badges on the D-pillars.
now features a black crackle finish to the Arnage T’s inlet
manifold, embossed Bentley logo on plenum chambers and new ‘6¾
LITRE TWIN TURBO’ engine plaques.
updates include new hide-trimmed gearlever and chrome gearlever
bezel providing access to semi-automatic transmission function.
New Thin Film
Technology driver information panel displays more comprehensive
and clearly accessible information.
Arnage RL model
receives additional standard specification including rear centre
armrest bottle cooler, veneered rear centre cushion box, rear
rSAP master telephone system, and reversing camera (US, EU,
Australia and New Zealand markets only).
Bentley’s 6.75-litre V8
engine is the centrepiece of the 2007 Model Year Arnage development
programme. This remarkable engine, the fundamental design of which
has served Bentley models proudly for nearly five decades, has been
extensively re-engineered to provide, in Arnage T specification,
500bhp and 1000Nm of torque - figures that ensure that the legendary
Bentley wave of torque is even more astonishing than before. Top
speed of the Arnage T has risen from 168mph/270km/h to
179mph/288km/h, while the 450bhp Arnage R and RL’s maximum speed
increases by 13mph/21km/h to 168mph/270km/h.
When the first V8 engine was built in the1950s, the design brief
unwittingly benefited later generations of Bentley engineers. It was
a very forward thinking design with an all-aluminium construction, a
five main-bearing crankshaft, and a well-supported camshaft. The
steps taken then laid the foundations for the longevity of the
“People might raise an eyebrow when they are told that the V8 engine
in their 2007 Model Year Arnage was first used by Bentley in 1959,”
says Bentley Motors’ Director, Powertrain and Chassis, Brian Gush.
“But the reality is the basic design was so good that we have been
able to continually improve it for nearly 50 years.
“One of the reasons the engine has evolved so successfully is the
position of the exhaust valves, high in the cylinder head,
originally designed for rapid heat dissipation to help engine
cooling. Decades later it meant that we could heat the catalytic
converter due to the short path from valves to catalysts, which
benefits exhaust emissions. This is just one of the reasons why this
brilliant engine lives on today.”
That first 6.25-litre engine produced around 200 horsepower – the
new 2007 Model Year 6.75-litre V8 has more than twice that output,
with 500bhp and 1000Nm of torque for the Arnage T. It was the
introduction of turbocharging and intercooling in the early 1980s
that saw step-change increases in the V8’s performance, and the
latest engine programme is no different. Two new low-inertia
turbochargers operate with far greater efficiency at lower engine
speeds – they reach maximum turbine speed in half the time of the
previous unit – thereby ensuring significantly reduced turbo lag and
that prodigious wave of torque at any revs.
Furthermore, a reprofiled camshaft with an all-new roller tappet
system provides revised valve timing and substantially improved
refinement. These changes also deliver for increased power, enhanced
durability and ensure compliance with European EU IV and US LEV II
standards. Although the 2007MY 6.75-litre engine produces around 300
horsepower more than its 1959 predecessor, its fuel consumption is
only 60 percent of the original and thanks to its advanced fuel
injection and exhaust controls, its emissions output is an
incredible 99 percent lower than Bentley’s first V8.
Drivetrain & Chassis
Such an impressive
increase in power and torque is, however, of little benefit unless
the powertrain is capable of delivering it to the driven wheels. For
this reason Bentley’s engineering team opted to introduce the latest
six-speed ZF automatic transmission to the Arnage range. This
state-of-the-art system offers two further ratios than the previous
gearbox and has several key advantages over its predecessor:
The wider range of
ratios is specifically tuned to each Arnage model, ensuring
greater flexibility, response and refinement for every model.
Performance feel is
also improved by using a sophisticated locking torque converter
system which provides a more rapid response to throttle inputs.
modes (Drive, Sport and Semi-Automatic) allow the driver to take
full advantage of the new gearbox. Semi-Automatic mode is
accessed by placing the gearlever into the sequential manual
gear-selector gate, where a new ratio can be engaged simply by
pushing the lever forwards or backwards.
electronic management system plays a major role in providing fast
yet smooth gearshifts regardless of how the car is being driven.
Previously the Arnage’s engine and transmission were governed by
independent electronic systems; in the 2007 Model Year, an uprated
Bosch computer-controlled management system ensures that both parts
work as a single unit to produce a supremely refined yet highly
“The new ZF gearbox gives us a different dimension in transmission
control,” says Dr Ulrich Eichhorn, Member of the Board, Engineering.
“Our main objective was to get the engine and transmission working
together enabling us to transmit every ounce of power. Using the
lock-up in all gears eliminates what we call the ‘rubber-band’
effect – the surge of engine speed without a corresponding
acceleration of the car – and gives much more immediate connection
of throttle input to road speed.
“As the engine speed approaches the point at which a gearshift is
due, it signals to the transmission that it is time to shift, so the
ratio changes are much quicker - it feels significantly faster from
the driver’s seat. Similarly, when the gearbox is ready to change up
it asks the engine to reduce the torque just for the period of the
shift, which adds to the refinement.”
Another important development for the 2007 Model Year Arnage range
is the separation of the sports suspension and sports gearbox
settings, allowing the driver to select their preference for each
system independently – via a ‘Sport’ button on the dashboard for the
suspension and by positioning the gearlever for the transmission’s
A comprehensive chassis tuning programme was instigated alongside
the powertrain updates to ensure the Arnage’s chassis comfortably
handles the additional performance. Refinements to the ESP logic
system allow more spirited handling without any reduction in
stability or safety.
The Traction Control system is extensively recalibrated with the aim
of avoiding unnecessary reduction in engine torque. The ESP system
now monitors the car’s overall stability rather than simply loss of
grip to the wheels. This reduces the amount of intervention required
and restores power earlier and more progressively, allowing the
power of the engine to be fully exploited.
“We don't believe in creating power and then taking it away,” says
Brian Gush, Director, Powertrain and Chassis. “This new system
allows the driver a lot more freedom to feel where the traction
limit is without ever getting into trouble. The traction control is
much more progressive and proportional – you can drift the car with
some wheelspin but it never lets you get in any trouble. It is a
calibration which keeps the spirited driver in mind.”
Following the detailed
design updates made to the 2005 Model Year Arnage, the latest models
receive further exterior styling changes.
‘The revisions we made to the Arnage series two years ago gave the
range exactly the sort of contemporary yet authentic Bentley feel
that it needed,” says Head of Exterior Design, Raul Pires. “Now with
big increases in power and performance we wanted to add some subtle
design cues to reflect the differences between the Arnage models.”
The performance intent of the Arnage T is underlined by the addition
of a new dark finish to its front radiator and bumper grilles. A
standardised bright chrome finish is applied to the R and RL grilles
while Bentley ‘B’ badges have been applied to the D-pillars on all
To highlight the superb feat of engineering beneath the Arnage’s
bonnet, a newly styled engine bay leaves no doubt as to the potency
of the car. A black crackle finish has been applied to the Arnage
T’s inlet manifold, while every model displays an embossed Bentley
logo on the turbocharger plenum chambers and new ‘6¾ LITRE TWIN
TURBO’ engine plaques.
Additional optional extras include a 19-inch six-spoke disc wheel
for the R and RL models, and 19-inch five-spoke ‘Blade’ sports wheel
for the Arnage T. Also available across the range is the famous
winged ‘B’ mascot, which saw a welcome return this year on the
Diamond Series Arnage. The iconic mascot – which can retract neatly
into the grille surround – was originally designed by motoring
artist F. Gordon Crosby and first used on the 1930 Bentley 8 Litre.
Interior design updates include a new hide-trimmed gearlever, chrome
gearlever bezel, and new Thin Film Technology driver information
panel to display more comprehensive and clearly accessible
information. The Arnage RL model receives additional standard
specification including a rear centre armrest bottle cooler,
veneered rear centre cushion box, rear rSAP Bluetooth master
telephone system and reversing camera (US, EU, Australia and New
Zealand markets only).
The significant upgrades
to both engine and transmission mean every new Arnage will not just
match customer expectations but surpass them on all fronts, as Dr
Franz-Josef Paefgen, Bentley Motors’ Chairman and Chief Executive
“These important powertrain enhancements reaffirm the very essence
of the Bentley Arnage, offering our customers an absolutely unique
blend of seamless power and torque which produces storming
performance when you demand it and blissfully relaxed cruising when