BMW is testing a four-motor propulsion system for future high-performance electric M vehicles, announced the automaker on Wednesday in a press release.
The car manufacturer has already introduced the M Performance models i4 M50 and iX M60, but not a dedicated electric M model that goes all out. The prototype powertrain hints at what could drive the first of those models.
BMW stated that it is testing both the powertrain and a related chassis control system that helps distribute power more effectively, claims the automaker. The infinitely variable torque distribution of electric motors allows a lot of flexibility, noted BMW, and said that the system measures sensor output as well as steering angle and throttle pressure to apply the optimal amount of power.
The development of the i4 M50 borrows some elements from the gasoline-powered BMW M3 and M4 (which share the same platform) to improve cooling and torsional rigidity, as well as to make room for the four motors. Two motors drive each axle, meaning that each wheel has its own individual motor.
BMW’s use of a four-motor propulsion system for a high-performance electric vehicle is not an efficient approach; it adds extra weight and is quite novel, as many other manufacturers are maximizing their three-motor setups. Lucid has been developing a tri-motor version of the Air, and Tesla previously showcased the tri-motor Model S Plaid+, although the latter was effectively canceled.
The GMC Hummer EV also uses three motors, enough to make the roughly 9,000-pound truck go from 0 to 60 mph in 3.0 seconds with the “Watts to Freedom” (WTF) mode. Audi E-Tron S versions with three motors are available but are rare, and we haven’t had the opportunity to drive them, let alone follow the two-motor versions.
Rivian offers a four-motor powertrain in the R1T pickup and R1S SUV, but hints that the design is very costly to build, although it includes special Tank Turn and K-Turn modes. Tesla has also promised a four-motor version of the Cybertruck, while the Lordstown Endurance is scheduled to use four motors in the wheels.
