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The BMW 123d EfficientDynamics

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The BMW 123d EfficientDynamics
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BMW 123d: EfficientDynamics reach a new dimension
Source: BMW Group

Four-cylinder diesel engine with Variable Twin Turbo featured in the BMW 1 Series sets new standards for a balance between driving pleasure and fuel economy. Maximum output: 150 kW/204 bhp, acceleration from 0 to 100 km/h in 6.9 seconds, average fuel consumption: 5.2 litres/100 km, CO2 emission level: 138 grams/km.

Curtain up for another cutting edge BMW diesel engine: The BMW 1 Series now features the third version of a new generation of four-cylinder diesel engines currently celebrating its world premiere. The new power unit lies under the bonnet of the BMW 123d and boasts fascinating sporting power and fuel economy unrivalled in its performance class. The new 2-litre four-cylinder engine delivers an output of 150 kW/204 bhp and a maximum torque of 400 Nm, allowing the 3-door model version of the BMW 123d to accelerate from 0 to 100 km/h in just 6.9 seconds (5-door version: 7 seconds). Average fuel consumption based on an EU test cycle is 5.2 litres/100 km for both versions, and the CO2 emission level is 138 grams/ km, making the BMW 123d the first production vehicle with a maximum output higher than 200 bhp and conventional drive technology to achieve a CO2 level below 140 grams/km.


BMW’s outstanding competence in the development of diesel engines provides the basis for a unique balance between dynamics and fuel economy. The new four-cylinder diesel engine has an all-aluminium crankcase, Variable Twin Turbo (VTT) and third-generation Common Rail Injection featuring piezo injectors that feed fuel into the combustions chambers at a pressure of 2000 bar. In addition, efficiency-enhancing measures applied to the engine’s periphery such as brake energy regeneration and an Auto Start Stop function have further optimised fuel consumption and emission levels. Thanks to this concentration of innovative technology, the BMW 123d has taken the lead in its competitive segment not only in terms of driving dynamics but also fuel economy.

Pure unadulterated EfficientDynamics: best results in performance and fuel economy.
The most powerful version of the new generation of BMW four-cylinder diesels is an outstanding engine indeed. As the world’s first all-aluminium diesel engine it develops a specific power output of more than 100 bhp. Along with this and an average fuel consumption of 5.2 litres/100 km, the BMW 123d is the particularly fascinating embodiment of the goals the BMW EfficientDynamics development strategy aims to achieve. It offers more driving pleasure than any other diesel model found in this segment. At the same time it provides fuel economy seldom offered even by significantly less powerful vehicles. The BMW 123d – like all other BMW diesel models – is equipped as standard with a diesel particulate filter located in the vicinity of the engine.

The first four-cylinder diesel engine with Variable Twin Turbo.
The experience of driving a new BMW 123d is distinctively characterised by the engine’s spontaneous response and awesome development of power. Maximum torque of the 1995 cc four-cylinder engine is 400 Nm and is already available at an engine speed of 2 000 rpm, maximum output being achieved at 4 400 rpm. The tremendous pulling force unique in this engine segment is achieved with the help of a two-stage turbocharger. This system, which was developed by BMW and termed as Variable Twin Turbo (VTT), was first featured by the most powerful straight six diesel of the BMW 5 Series. In the meantime this 210 kW/286 bhp power unit has been successfully introduced for several series. Variable Twin Turbo is now being employed for the first time in conjunction with a four-cylinder diesel engine.


The Variable Twin Turbo system comprises a small and a large exhaust turbocharger. Due to its lower torque of inertia the smaller turbocharger already takes effect at engine speeds only slightly above idling levels, the larger turbocharger producing an additional performance-boosting effect as soon as higher engine speeds are reached. Thanks to this configuration, there is no so-called turbo lag. A significant increase in power is felt as soon as the foot touches the accelerator. A turbine control valve variably distributes the flow of exhaust to each turbocharger. Specially designed and highly effective engine electronics ensure precise management of the transfer and interaction between both turbochargers. They coordinate the entire system comprising turbines, turbine control valve, bypass and wastegate according to the engine’s operational status.

Last Updated on Friday, 27 July 2007 08:13  

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