The BMW B58 is a turbocharged straight-six engine, which began production in 2015. The B58 replaced the N55 and was launched in the F30 340i.
The B58 is part of BMW's new modular engine family, each engine using a displacement of per cylinder, following the B38 and B48 engine.
The B58 engine was named to Ward's World's 10 Best Engines 4 times, in 2016 (installed in the 340i), 2017 (M240i), 2019 (X5) and 2020(M340i).
The S58 engine, which was released in early 2019, is the high-performance version of the B58.
Design
Compared with its BMW N55 predecessor, the B58 features a 20% increase in boost pressure, a closed-deck engine block design, an increase in compression ratio to 11.0:1 and a slight increase in displacement from with added weight of .
The turbocharger is a twin-scroll design, for more efficient power delivery with less turbo lag and more power than a conventional single turbocharger, as well as for weight and space saving benefits. The intercooler - a water-to-air design - is integrated into the intake plenum, to reduce the volume of air between the turbocharger and the cylinders.
As per the N55, the B58 also features direct fuel injection, variable valve timing (called double Vanos by BMW), and variable valve lift (called Valvetronic by BMW). The redline remains at 7,000 rpm, the bore and the stroke is .
The B58 also features an engine-mounted heat encapsulation system to reduce engine wear and emissions during start-up.
For durability and longevity, the rotating assembly has a forged steel crankshaft and forged connecting rods.
As a part of BMW's new modular engine family, the crankcase is a completely new design identical to the B57 diesel version, engineered as both a gasoline and diesel engine in one common part. The closed deck crankcase is equipped with a completely new structure which can be identified by a complex array of ribs on the exhaust and intake side and an additional reinforcement frame on the oil pump side.
The engine was revised in 2018, dubbed "B58TU", with notable changes and improvements. The fuel system was updated with 75% increased pressure with updated high pressure fuel pump and injectors, a new particulate filter in the catalytic converter, a new one-part timing chain as opposed to the earlier two-part, and new separate cooling circuits for the cylinder head and crankcase. For weight savings, the crankcase wall thickness and forged crankshaft were optimized, and the exhaust manifold was integrated into the cylinder head housing.
Models
B58B30M0: 240 kW (322 HP) version
Applications: 2015–2019 F30/F31/F34 340i 2016–2019 F32/F33/F36 440i 2016–2019 G11/G12 740i/Li
B58B30M0: 250 kW (335 HP) version
Applications: 2016–2019 F20/F21 M140i 2016–2021 F22/F23 M240i
2017–2019 G30/G31 540i
2017–2019 G32 640i
B58B30M0: 265 kW (355 HP) version
This version was used for 3-/4-Series with the "M Performance Power and Sound Kit".
Applications: 2016–2019 F30/F31/F34 340i 2016–2019 F32/F33/F36 440i 2017–2019 G01 X3 M40i 2018–2019 G02 X4 M40i
B58B30M1: 250 kW (335 HP) Applications: 2018–2023 G05 X5 xDrive40i/sDrive40i 2018–2023 G07 X7 xDrive40i 2018–present G29 Z4 M40i (in countries subject to EU emissions standards) 2019-present Toyota GR Supra 2020–2023 G30/G31 540i 2020–2023 G32 640i 2020–2023 G06 X6 xDrive40i 2020–2022G11/G12 740i 2019–present G14/G15/G16 840i 2019–present Morgan Plus Six
B58B30C: 250 kW (335 HP) 2020 J29/DB Toyota Supra 2022–present Ineos Grenadier
B58B30O1: 285 kW (382 HP) Applications: 2018–present G29 Z4 M40i (in countries not subject to EU emissions standards) 2019–present G20 M340i 2019–present G21 M340i 2020–present G01 X3 M40i 2019–present G02 X4 M40i 2020–present G22 M440i 2021–present Toyota Supra (in countries not subject to EU emissions standards) 2021–present G42 M240i 2021–present Boldmen CR4
B58B30M2: 280 kW (375 HP) 2022–present G07 X7 xDrive40i 2023–present G70 740i 2024–present G05 X5 xDrive40i 2024-present G06 X6 xDrive40i 2024-present G60 540i xDrive
S58
The S58 engine is the high-performance version of the B58 engine. It was introduced in the F97 X3 M and F98 X4 M, marking the first time a stand-alone M model was produced for the X3 and X4.
The S58 features twin mono-scroll turbochargers, a compression ratio of 9.3:1, a redline at 7,200 rpm with the bore and the stroke at . It also features a forged chrome molybdenum heat-treated steel crankshaft, plus forged steel connecting rods and forged aluminum pistons. The pistons are forged by Mahle and feature their proprietary anti-friction coating.