BMW engineers are taking the B58 engine to the next level, extracting substantially more horsepower and torque while using mild-hybrid technology to help meet increasingly stringent emissions regulations.
New software and hardware bring 480 hp, 100 dB and a 300 km/h top speed to the M240i, M340i, M440i and Z4 M40i.
Same displacement, same family — but the S58 borrowed its connecting rods from a V8 and runs three radiators.
It seems that BMW is preparing to unlock a few more horses from the B58 engine installed in the M Performance 2 Series Coupe.
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From the 3 Series to the Supra, BMW’s turbocharged B58 engine has become the backbone of the brand—and beyond.
BMW gives the M240i, M340i, and M440i a revised B58 engine with more power, extra torque, and improved efficiency.
