Audi introduces new four-cylinder 48V MHEV powertrain to the A6 and A7

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In the pursuit of optimal economy Audi has added a new mild-hybrid drivetrain to the A6 and A7. Equipped with the 2.0-liter, 204ps 40 TDI unit, this is the first time a four-cylinder has been fitted in the five-door coupe.

The key component behind the MHEV system is a belt alternator starter (BAS) connected to the crankshaft which, in this application, can recover up to 5kW of power during deceleration and store it in a separate lithium-ion battery housed in the rear of the car.

The 40 TDI can also coast with the engine running at idling speed between 54km/h and 159km/h. As soon as the driver accelerates again, the BAS restores power.

The 2.0-liter unit in both A6 and A7 sportback applications offers fuel economy of 3.7l/100km and CO2 output from 117g/km, while the A6 Avant has a potential of 3.9l/100km, corresponding to CO2 production of 124g/km.

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Sam joined the UKi Media & Events automotive team in 2017. Having started out as assistant editor for a number of titles including Automotive Powertrain Technology International, Automotive Testing Technology International and Professional Motorsport World, he was appointed editor of PTI in 2020. Sam produces content for both the magazine and website.

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