BMW unwraps four-door M6 GranCoupe

GREG KABLE
Last updated 07:10 14/12/2012
2014 BMW M6 Gran Coupe.

WRAPS OFF: We haven't got to 2013 yet and BMW has just unveiled the 2014 BMW M6 Gran Coupe.

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BMW has revealed its eagerly anticipated 412kW twin-turbocharged 4.4-litre V8 powered M6 GranCoupe in a series of official photographs ahead of the sleek four-door’s planned public debut at next month’s Detroit auto show.

Set to rival the Mercedes-Benz CLS63 AMG, Porsche Panamera Turbo and upcoming Audi RS7, the rapid new super sedan promises to broaden the scope of the existing M6 line-up, providing added levels of practicality and improved comfort through the adoption of two extra doors and greater rear seat accommodation than its recently introduced coupe and convertible siblings, alongside which it will be produced at BMW’s Dingolfing factory in Germany from early 2013.

The latest in a ever growing range of BMW M models is distinguished from lesser versions of the svelte 6-series GranCoupe revealed earlier this year through a series of traditional exterior styling cues developed under the guise of BMW M division’s long time head of design, Uwe Weidehase – all providing the M6 GranCoupe with an more aggressive visual character in line with its elevated performance potential.

Included is a deeper front bumper with sizeable cooling ducts for the engine bay and front brakes, altered kidney grille with twinned horizontal slates and M6 identification, adaptive headlamps, widened front wheel arches, a chromed indicator lamp surround within the front wings, deeper sills underneath the four doors, aerodynamically optimised mirror housings and a carbon fibre-reinforced plastic roof panel.

At the rear, the M6 GranCoupe receives others customary BMW M division styling flourishes, with further M6 identification attached to the boot lid and a uniquely profiled bumper housing both a carbon fibre-reinforced plastic diffuser element that is shaped to draw hot air away from the rear differential and a quartet of chromed tailpipes. Wheels are 20 inches in diameter – 9.5 inches wide up front and 10.5 inches at the rear. They come shod with standard 265/35 and 295/30 profile tyres.

The M6 GranCoupe is based around a high strength steel platform that boasts the same 2964mm wheelbase as the M5. It also receives tracks that have been widened significantly over the standard 6-series GranCoupe at 1631mm and 1612mm respectively.

The third member of the second-generation M6 line-up runs BMW M division’s twin-turbocharged 4.4-litre engine, as first seen in the M5 and more recently brought to the M6 coupe and cabriolet. Power peaks at 412kW, while torque swells to a maximum 680Nm on a band of revs between 1500 and 5750rpm.

At 1875kg, the M6 GranCoupe weighs 5kg more than the M5, endowing it with a weight to power ratio of 4.6kg per kW.The heady reserves are channeled to the rear wheels via a standard seven-speed dual-clutch gearbox and electronically controlled M differential.

BMW claims its new performance sedan is marginally faster than its keenest four-door rival on the run from 0 to 100 kmh, claiming an official time of 4.2sec for the M6 GranCoupe versus 4.3sec for the performance package touting CLS63 AMG, whose twin-turbocharged 5.5-litre V8 engine kicks out 409kW in combination with an optional performance package. Top speed is nominally limited to 250 kmh. However, buyers can increase it to 305 kmh through the uptake of an optional driver’s package, which brings revised engine management software among other modifications, including tyres boasting a higher speed rating than the standard rubber.

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Further straight line performance claims include an 80-120 kmh 4th gear rolling acceleration time of just 3.6 secs and a standing 1000 metres time of 21.7 secs. With increasingly common fuel saving functions such as stop/start and brake energy recuperation included as standard, the M6 GranCoupe’s fuel consumption is put at 9.9L/100km on the European test cycle, giving it average CO2 emissions of 232g/km.

-Fairfax News Australia

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