A more powerful Bentley Continental GT Speed and a V8 version of the Bentley Flying Spur have been revealed ahead of their Geneva motor show debut on March 4.

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Bentley’s long-serving twin-turbocharged 6.0-litre W12 has been further refined to produce 467kW of power and 820Nm of torque in the Continental GT Speed coupe and convertible pair (up 7kW/20Nm). The enhanced engine helps the former sprint from 0-100km/h in 4.2 seconds and on to a top speed of 331km/h, making it the fastest production Bentley in history.

Updates to the Continental GT Speed’s exterior include a body-colour finish across the front splitter, side skirts and diffuser; smoky-finished headlights, tail-lights, and 21-inch alloy wheels; red brake calipers; chrome ‘Speed’ badges over the front wheels; and a new Candy Red paint colour.

The dark tones of the interior are offset by contrasting stripes across the doors, rear panels, console and gearlever, and matching contrast stitching on the diamond-quilted doors and seats. The Speed also exclusively features a central colour split screen.

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Joining the upgraded Continental GT Speed is the Bentley Flying Spur V8. The new entry-spec luxury sedan gains the car maker’s 4.0-litre twin-turbo V8, which produces 373kW and 660Nm.

Claiming combined cycle fuel consumption of 10.9 litres per 100km, the Flying Spur V8 betters the W12 version by 26 per cent, and is just 0.3 seconds slower to triple figures (4.9sec).

As in the W12, the Flying Spur V8 feeds power through an eight-speed automatic transmission to all four wheels.

Subtle styling tweaks differentiate the V8 from its 12-cylinder sibling, including ‘figure of eight’ chrome exhaust finishers, black lower front intake mesh, and red-backed Bentley badges.

Deliveries of the Bentley Flying Spur V8 will commence from mid-year while the updated Continental will launch in the third quarter of 2014.