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BMW lowers emissions of the 320d to 109g/km

BMW has managed to lower the emissions of the new 320d saloon to 109g/km CO2, which equates to 68.9mpg.

Be in no doubt, this is amazing progress for a premium saloon, and it means it’s the first car in the premium sector to drop under the 110g/km barrier.

How has BMW achieved this?

In addition to the existing suite of BMW EfficientDynamics technologies, including Auto Start Stop, Brake Energy Regeneration and Electric Power Steering for optimum performance, that have featured on all four-cylinder BMW 3 Series models since September 2007, the new 320d ‘EfficientDynamics’ Saloon has a longer rear axle transmission ratio, lowered suspension and the use of specially designed aerodynamic alloy wheels with Michelin EnergySaver tyres.

The company says it’s also due to engine construction which should result in the driver using a higher gear more often; specifically, a dual mass flywheel with springs between the two parts to help smooth out any engine vibration through the drivetrain. This is enhanced with the fitting of new Centrifugal Pendulum Absorbers to improve smoothness further.

This innovation combined with the longer transmission ratio significantly reduces engine speed compared to a ‘standard’ 320d Saloon, benefiting fuel economy and emissions.

The single turbocharged diesel 1,995cc powerplant features an all-aluminium crankcase and third generation common-rail injection technology with piezo injectors to which also help to achieve its impressive consumption and emissions figures.

So does performance suffer? Not really. The BMW 320d EfficientDynamics Saloon develops 163hp between 3,500rpm to 4,200rpm and 360Nm of torque from 1,750rpm to 3,000rpm. This equates to a zero to 62mph time of 8.2 seconds and a top speed of 137mph. Acceleration in fifth gear from 50mph to 75mph takes 9.6 seconds.

The BMW 320d EfficientDynamics Saloon will cost just £35 a year to tax courtesy of a Vehicle Excise Duty band B rank, and comes with a 13 per cent benefit-in-kind rating.

The BMW 320d EfficientDynamics Saloon will be unveiled at the Frankfurt Motor Show and go on sale in January 2010.

The specification of the car will be on a par with a BMW 320d SE and includes two-zone air-conditioning, rear Park Distance Control, BMW Professional radio, multi-function leather steering wheel and Extended lighting. However the SE specification 17-inch alloy wheel is replaced with 16-inch Aero alloy wheel.

Pricing is likely to mirror the existing ‘standard’ BMW 320d SE Saloon.

BMW Group has been named the world’s most sustainable car manufacturer in the Dow Jones Sustainability Index for the fourth year in succession.