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BMW M340i B58 Engine Overview The BMW G20 M340i is powered by the B58B30O1 — a 3.0-litre turbocharged inline-six that produces 382 HP and 500 Nm from the factory. The B58 is widely regarded as one of BMW's best modern engines, combining the smoothness of an inline-six with the efficiency of a single twin-scroll turbocharger. It shares its fundamental architecture with the S58 found in the M3 and M4, but uses a single turbo instead of twins and an open-deck block instead of closed-deck. What makes the B58 exceptional for tuning is its conservative factory calibration. BMW intentionally limits the...

BMW M340i / M440i B58 ECU Tuning Guide The BMW B58 3.0-litre twin-scroll turbocharged inline-six is one of the most tuneable engines BMW has ever produced. Found in the G20 M340i, G22 M440i, and their xDrive variants, this engine delivers 382 HP and 369 lb-ft of torque in stock form — but its true potential is far greater. With a well-calibrated ECU remap, the B58 can reliably produce north of 450 HP on completely stock hardware, making it one of the best platforms for performance tuning in the current BMW lineup. In this comprehensive guide, we break down every tuning...