Bentley’s new 616hp 12-cylinder GT Speed convertible with 8-speed and energy recuperation improves fuel economy by 15%
Bentley will introduce the new Continental GT Speed Convertible at the North American International Auto Show in Detroit this month. The new GT Speed Convertible shares its powertrain specification with its Bentley stablemate, the GT Speed coupé: a 616 bhp (459 kW) twin-turbocharged 6.0 liter W12 combined with a close-ratio eight-speed ZF transmission to deliver a 15% improvement in fuel economy.
|The Continental GT Speed Convertible. Click to enlarge.|
Provisional EPA fuel economy ratings for the convertible are 12 mpg city, 20 mpg highway, and 15 mpg combined. Provisional EU cycle fuel consumption figures are 22.7 l/100km urban, 10.4 l/100km extra-urban, and 14.9 l/100km combined.
The twin-turbocharged, 48-valve, W12 engine powers the new convertible to 60 mph in 4.1 seconds (0-100 km/h in 4.4 s) and onto a top speed of 202 mph (325 km/h). Zero to 100 mph (160 km/h) takes 9.7 seconds. Peak torque of 800 N·m (590 lb-ft) is reached at 2000 revs/min through to 5000 revs/min.
The latest ME17 engine management system provides enhanced turbocharger control and torque management. In common with all W12-engined models, the GT Speed convertible features an energy recuperation system. Together with a close-ratio, quick-shifting eight-speed transmission, this has resulted in the 15% improvement in fuel economy and CO2 emissions compared with the first generation Speed, with a commensurate increase in tank range.
Switching the gear selector to ‘Sport’ mode delivers a sharper throttle response, gear-shifting at higher engine speeds and faster ‘block shifting’ (e.g. 8th direct to 4th gear).
The Electronic Stability Control (ESC) system is optimized for the new engine management system to deliver both safety and greater driver involvement. The ESC system retains the “Dynamic Mode” setting that allows increased wheel slip at higher speeds, with engine torque reinstated more quickly after a system intervention.