BMW is preparing an upgraded variant of its latest straight-6, the 3.0L turbo B58 which has used many 40i branded designs since 2015.
The new engine should be renamed M58B30M2 and thus join the long line of 6 cylinders whose name started with M (read our file on L6 BMW).
The current engine is capable of many types of BMW, X5 xDrive40i, X7 xDrive40i, 540i, 640i, 740i and 840i where it boosts 335bhp. The modified version also enables Toyota Supra, Z4 M40i, M340i, X3 M40i, X4 M40i, M440i and M240i where it is good for 382hp.
Several sources indicate that the newly upgraded B58 engine will produce around 370 hp instead of the current 340. Knowing that the dynamometric tests of the B58 revealed that the BMW engine delivers the power shown to the wheels and not to the crankshaft, it is certain that this engine is more powerful than officially announced.
BMW will also use this upgraded B58 engine to replace the 382hp variant. BMW blogs speculate that this straight-six version would have approximately 400hp and would also benefit from several other improvements to provide better temperature management while being more responsive and efficient.
The new B58 engine, or M58, is expected to start for the first time under the bonnet of the upcoming 540i and 740i.
Read our file on BMW 6-cylinder history
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