The BMW M106 motor replaced the BMW M102 motor. The addition of Bosch Motronic engine management and an increased displacement to 3.4 liters produced the same output power as the M102 at lower RPM and with better fuel economy, and at only 6 psi vs. the M102 boost pressure of 10 psi. The M106 motor was used to power the 745i E23 until its end of production in 1986.