XCAR gets some personal time with the new BMW M3 and M4. The UK magazine walks us around the two M brothers and as a bonus, they even rev up the engine.
BMW has reverted to an inline six cylinder for the new M3 and M4. But unlike the S54 in the E46 M3, the new S55 is turbocharged. Based on the N55 six cylinder, the S55 utilizes VANOS and Valvetronic as well as gasoline direct injection in the cylinder heads.
Unlike the N55′s twin-scroll single turbocharger, the S55 utilizes two turbochargers, one turbo per three cylinders.
Given all of the heat the engine is capable of producing, BMW has taken great care in ensuring that it is properly controlled, especially knowing that the M3/M4s will see a lot of track time.
The S55 is set to deliver 431 HP and 406 lb-ft of torque. To ensure that nothing untoward happens on the bottom end the S55 employs a forged steel crankshaft. The torque developed by the S55 is fully available from 1,850 to 5,500 RPM which leads one to believe that the turbos selected for use on the S55 are slightly larger than the ones employed on the N54 motor of yore.
Let’s have a look.