Energy management in the BMW 4 Series Convertible.

Superlative performance translated into propulsion with maximum efficiency – the BMW 4 Series Convertible, too, demonstrates the innovative breadth of BMW EfficientDynamics through an extensive package of technologies. For open-air driving pleasure: unmistakably dynamic, low on emissions.

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ECO PRO Mode helps drivers reduce their fuel consumption by up to 20 per cent, depending on their driving style – according to an internal BMW fuel consumption study. The additional functions, coasting (with Steptronic transmission only), Route-Ahead Assistant and ECO PRO Route (both with Navigation System Professional only), deliver even more savings potential.

  • Coasting function
  • Route-Ahead Assistant
  • ECO PRO Route


The entire vehicle design is testament to the BMW EfficientDynamics philosophy. The optimised, aerodynamic front apron and undercarriage feature innovations that reduce air resistance and fuel consumption. The front apron is a prominent design feature that embodies the BMW EfficientDynamics philosophy. The integrated Air Curtain channels air through two vertical air inlets and along the front wheel arches. The accelerated air flow creates a kind of ""curtain"" on the outer side of the wheels. Then there are the Air Breathers, which channel the air flow at the front wheels. These innovative technologies reduce turbulence and air resistance, which in turn significantly reduces fuel consumption.
The flat undercarriage cover, which also shields the engine compartment, is an additional detail that greatly improves the car’s aerodynamics. These new trim elements are not only highly advantageous in terms of aerodynamics: they also improve the sound insulation and provide greater protection against rust.


In petrol engines, BMW TwinPower Turbo technology combines a TwinScroll turbocharger with Valvetronic including Double-VANOS and High Precision Injection. In this way, BMW TwinPower Turbo significantly reduces the fuel consumption of petrol engines – while at the same time boosting power output across a wide range of engine speeds.


The Automatic Start/Stop function makes sure that fuel is only used when the car is actually driving. While waiting at traffic lights or in stop-and-go traffic, the Automatic Start/Stop function saves fuel by switching off the engine as soon as the driver brakes to a complete standstill (Steptronic transmission).
A signal in the Info Display indicates that the Automatic Stop/Start function is active. As soon as the driver takes his foot off the brake (Steptronic transmission), the engine immediately switches itself back on.
The Automatic Start/Stop function never compromises driving comfort and safety, as it remains inactive if the engine has not reached its ideal running temperature, the interior has not yet been sufficiently heated/cooled, if the battery level is too low or if you are turning the steering wheel.
A central control unit restarts the engine if required, even when the car is at a standstill – for example, if the car starts to roll forward or if the windscreen becomes foggy. The Automatic Start/Stop function can be switched off at any time with the push of a button.


Every time you brake, kinetic energy is generated, and until recently, this energy has gone unused. Brake Energy Regeneration takes advantage of this long-overlooked potential. It harnesses the coasting energy that is generated whenever the driver brakes or takes their foot off the accelerator and turns it into electricity. This electricity is then used to charge the car battery. The intelligent energy management system means that the alternator no longer needs to run permanently, which reduces the strain on the generator. The result is reduced fuel consumption and increased performance – classic BMW EfficientDynamics.


Optimized steering feeling.

Every time you turn the steering wheel, energy is consumed. But why should energy be consumed when you’re not moving the wheel? BMW Electric Power Steering is only active when it’s needed. Unlike conventional hydraulic steering systems, this solution from BMW only uses energy when you’re actually turning the wheel. When the steering wheel is static – e.g. when driving straight ahead along a motorway at high speed – the electric motor is inactive.