The first rumors about the
future BMW M3’s engine sent chills through the automotive industry.
Apparently, BMW had plans to put in a tri-turbo V6 engine with an output of about 450 HP in the M3.
This new engine would combine two conventional turbos with one
electric turbo to help the vehicle’s fuel economy.
Those rumors were later squashed by new rumors about a new twin-turbocharged 3.0-liter, six-cylinder engine currently under development.
But, alas, the tri-turbo engine returns with a new patent filed by BMW for electric-powered turbocharger technology.