The new generation of the BMW M5 is entering the market with a plug-in hybrid powertrain, sparking mixed reactions among enthusiasts. This major technological development raises questions about BMW's strategic choices in terms of electrification. A deep dive into the reasons that led the Bavarian manufacturer to favor hybridization rather than an all-electric version for its iconic sports sedan.
A revolution under the hood
The new BMW M5 marks a turning point in the history of the model with the adoption of a plug-in hybrid powertrain. This major technical development represents a radical departure from the previous generation.
The propulsion system combines a 4.4-litre twin-turbo V8 engine and a synchronous electric motor, a configuration similar to that of the BMW XM. This combination allows for an impressive output of 727 hp and 1,000 Nm of torque.
Weight, the Achilles heel of hybridization
While the performance figures are appealing, hybridisation has a significant impact on the vehicle's mass. According to data provided by BMW, the new M5 weighs in at over 2.5 tonnes with driver, an increase of around 500 kg compared to the outgoing model.
This significant weight gain raises questions about the choice of a high-capacity battery. Some competitors have opted for lighter hybrid solutions, better preserving the vehicle's agility.
All-electric, a discarded option
Frank Van Meel, head of BMW's M division, revealed in an interview with Top Gear magazine that the idea of an all-electric M5 had been considered five years ago. However, this idea was quickly abandoned.
According to BMW engineers, current technology did not allow for a satisfactory balance between sporty performance and long-distance range. The manufacturer felt that the electric vehicle still needed further development to meet the demands of the M customer base.
The plug-in hybrid, a compromise assumed
Faced with criticism regarding the extra weight caused by hybridisation, Frank Van Meel defends BMW's choice: “We were not able to make a convincing proposition with mild hybridisation. A plug-in hybrid system offers continuous electrical power and energy, beyond a simple temporary boost function.”
The executive also points out that conventional hybridization would have already resulted in a weight gain of around 200 kg. With this in mind, BMW preferred to opt for a solution offering all the advantages of electrification, including an electric range of 69 km.
Optimized weight distribution
To compensate for the increased weight, BMW M engineers worked on mass distribution. “We added our 'ballast' where it was most beneficial: the battery is placed in the floor, lowering the center of gravity compared to the previous M5,” explains Frank Van Meel.
This configuration aims to preserve the dynamic behavior characteristic of the M models, despite the significant increase in weight.
A bet on the future
The choice of plug-in hybrid powertrain for the new BMW M5 reflects the manufacturer's desire to combine high performance with reduced emissions. This strategy is part of a long-term vision, taking into account changing environmental standards and customer expectations.
Although some purists may regret the increase in weight, BMW is banking on the advantages of electrification to offer a new driving experience, combining power, efficiency and versatility.
The new BMW M5 plug-in hybrid marks an important step in the evolution of the M range. While the choice of a 100% electric engine was not an option for this generation, it is very likely that future iterations of the M5 will take this step, once the technology is mature enough to meet the performance and autonomy requirements of BMW M customers.
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