
On January 14, the Bentley Continental GT Speed Convertible makes its
international debut at the North American International Auto Show in
Detroit. Boasting a six-liter twin-turbocharged 48-valve W12 engine,
improved suspension, all-wheel drive and a top speed of 202 mph (325
km/h), Bentley claims it is the world’s fastest four-seat convertible.
Getting performance out of a convertible is always tricky. Cars rely
on the roof for structural integrity and chopping it off means adding a
lot of reinforcement to make up for the loss. The Continental GT Speed
Convertible weighs in at 2,900 kilograms (6,393 lb) as opposed to the Speed coupé’s 2,750 kilograms (6,063 lb), yet despite the extra weight it manages to lag behind the coupé by only 5 km/h (3 mph).
From the outside, the Continental GT Speed Convertible is definitely a
Bentley with its subdued lines and the boxy profile of its
exceptionally rigid body shell. It tries to be a bit more sporty than
its fellow Bentleys with its 21-inch alloy wheels, dark-tint matrix
grilles, “rifled” elliptical exhaust tailpipes, and front wings in
superformed aluminum, but you get the feeling that it’s fighting with
itself about what sort of car it wants to be. Is it “creating an
impression of tension and muscularity” as Bentley claims, or is it still
the car your bank manager drives?
Inside, the Speed Convertible has the same powertrain as the GT Speed
coupé. The six-liter twin-turbocharged 48-valve W12 punches out 616 bhp
(460 kW, 625 PS) and 800 Nm (590 lb/ft) of torque – all held in check
by the ME17 engine management system. This crunches 180 million
calculations per second as it enhances the turbocharger control and
torque management. As with other W12-engined models, there is an energy
recuperation system. Fuel consumption is 14.9 liters/100km (19.0 mpg) –
15 percent better than the Speed coupé.
Backing up the engine is a flappy-paddle ZF eight-speed automatic
gearbox with Quickshift, Block Shifting and permanent all-wheel drive
with a 40:60 rear bias that Bentley claims provides optimum traction and
power in all road conditions. According to Bentley, the upshot of all
this is sharper throttle response, gear-shifting at higher engine speeds
and faster “block shifting.”
Bentley has re-tuned the rack and pinion, power assisted,
speed-sensitive ZF servotronic steering for the Speed Convertible and
uprated and lowered the suspension. The front suspension consists of
four link aluminum double-wishbones, computer controlled self-leveling
air suspension with anti-roll bar, while the rear boasts trapezoidal
multi-link, computer-controlled self-leveling air suspension. These have
Continuous Damping Control tuned for dynamic performance. Standard
brakes are 405 mm ventilated discs in front and in the back are 335 mm
ventilated discs. Cross-drilled Carbon silicon carbide versions are
available as an option.

The Speed Convertible’s top speed of 325 km/h (202 mph) is matched by
a respectable bit of acceleration that sees it going from 0-96.5 km/h
(60 mph) in 4.1 seconds, 0-100 km/h (62 mph) in 4.4 seconds and 0-160
km/h (100 mph) in 9.7 seconds. Despite this burst of speed, Bentley says
that spoilers are unnecessary because the lip on the bootlid generates
enough downforce to keep the Speed Convertible on the tarmac even when
going flat out.
One interesting touch that Bentley is keen to point out is that “the
enhanced performance is accentuated by a glorious baritone snarl from
the free-breathing exhaust.” It’s not exactly what you expect from a
Bentley. No doubt it’s very cool, but given Bentley’s stately
reputation, it’s also a bit like finding out your aunt Agatha has taken
up free-base jumping.
Things quiet down a bit in the Speed Convertible’s interior with
diamond-quilted hide upholstery and a finish inspired by the Le
Mans-winning Bentleys of the 1920s. On a more modern note, there’s an
infotainment system with 15 GB of available storage space which can be
expanded via an SD card, connectivity for an iPod or MP3 player, and a
built-in six-disc CD changer. For those worried about the weather,
Bentley says that the hood can take on a monsoon (presumably when up)
and when it’s down, there’s a neck warmer to keep the chill off.
No price has been set, but with the coupé enjoying a starting price of US$217,725, this one is not in the econocar bracket.
Source;
Bentley, Gizmag