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The new B58 3.0 liter inline-six turbocharged engine gives BMW its 32nd trophy in the Wards 10 Best Engines list. The new engine springs from a new EfficientDynamics modular family of 3-, 4- and 6-cyl. engines used by the BMW and MINI brands, and it’s an improved version of the N54 and N55 units which both own awards in the past.
The B58 displaces 3.0 liter (though it’s technically a tad bigger, at 2.998L compared to 2.979L) and uses a TwinPower twin-scroll turbocharger, though the B48’s is also a bit bigger with a 6 percent increase in turbine wheel size and 10 percent increase in compressor wheel diameter, resulting in a 20% increase in boost pressure. The B58 will also feature most of the N55’s engine technologies, such as direct-injection and BMW’s Dual-Vanos and Valvetronic systems.
The block and head were completely re-engineered with a stroke that is extended by 0.19 ins. (5 mm) and a bore diameter that is .08 ins. (2 mm) smaller, as well as a higher compression ratio.
The B58 incorporates several fuel-saving gadgets, including stop/start, coasting, brake-energy regeneration and an on-demand coolant pump, electronically controlled oil pump and electromechanical power steering that consumes no electrical power when driving in a straight line. MPG is rated at 25 mpg.
