The V8-powered BMW M5 and XM Label SUV have seen a reduction of 40 horsepower due to the implementation of Euro 7 emissions regulations, despite the manufacturer claiming unchanged total system outputs. The engine modifications include tweaks to software, exhaust treatment, and the adoption of the Miller combustion cycle. Hybrid models are unaffected by these changes, with the electric portion of the plug-in hybrid powertrain remaining untouched.
BMW has not provided performance figures for either car in Euro 7 form, leaving many questions unanswered about the impact on acceleration numbers. In contrast to the more stringent 6e emissions requirements, EU lawmakers have watered down Euro 7 regulations after lobbying from automakers. The new rules are still tougher than the previous standards, with cars tested over a wider range of temperatures and required to achieve low emissions over a longer time period.
Brake and tire particle emissions are also being tested for the first time. As a result, many vehicles have seen a reduction in power, including the BMW M5 and XM Label SUV. The manufacturer is introducing multiple changes to the S68 V8s, including software tweaks, enhanced exhaust treatment, and the adoption of the Miller combustion cycle.
These modifications aim to improve efficiency by keeping the intake valves open longer to shorten the compression stroke slightly. Despite this reduction in power, BMW claims that the total system output of the M5 remains unchanged at 717 horsepower, while the XM Label SUV still produces 738 horsepower. However, hybrid models are not affected by these changes, with the electric portion of the plug-in hybrid powertrain remaining untouched.
In addition to the engine modifications, BMW is also working on some visual changes for the M5, including a new hood badge and updated branding, which will be introduced in February. The company is saving the more significant facelift for the MY27 model year. With Euro 7 emissions regulations now in place, many car manufacturers are adjusting their power outputs to meet the new standards.
While some may see this as a setback, others view it as an opportunity to improve efficiency and reduce emissions. As the automotive industry continues to evolve, it will be interesting to see how other manufacturers respond to these changes.
While BMW's decision to reduce power in the M5 and XM Label SUV may seem like a step backward, it's essential to consider the broader context of Euro 7 emissions regulations. By adopting more efficient technologies and software optimizations, BMW is taking a proactive approach to reducing its environmental impact.
