BMW 320i Teardown: Drivetrain, intake and exhaust system configurations

Subsystems that work with modular engines



Teardown analysis held at the Hiroshima Kokusai Gakuin University Automotive Junior College
(Photographed by reporter, the same hereinafter)

  This report will introduce the teardown analysis of the BMW 320i M Sport sponsored by the Hiroshima Industrial Promotion Organization, focusing on the drivetrain and intake/exhaust subsystems that work with the 2.0-liter inline four-cylinder gasoline engine described in the previous report.


Vehicle overview

  The BMW 3 Series underwent a full redesign in October 2018. The 320i used for this teardown analysis features a detuned 330i engine. In Germany, BMW’s home location, the model is sold as a low-priced version, but for the Japanese market, the model combines the engine with a high-grade interior and equipment and is sold as a Japan-exclusive model. The model is offered in three trim levels: Standard, SE, and M Sport, but all perform identically. The M Sport, aside from differences in cosmetic parts, differs only in a suspension system with grade-specific settings, a “sport” automatic transmission featuring the ability to change shift timing, and non-linear geared “variable sport” steering (the greater the steering wheel is turned, the quicker the vehicle turns). Major vehicle specs are as follows.


Teardown analysis vehicle: BMW 320i M Sport Japan Edition

Item Spec
Vehicle type 3BA-5F20
Length/width/height 4715 / 1825 / 1430 mm
Wheelbase/tread 2850 / 1585 (front) / 1570 (rear) mm
Vehicle weight 1560 kg
Transmission 8-speed torque converter automatic transmission with mode selection
Emission standards Compliant with 2018 standards
Fuel efficiency (Ministry of Land, Infrastructure, Transport and Tourism examination value) 15.2 (JC08), 13.1 (WLTC-comb.) km/l
Vehicle base price JPY 5.4 million (excluding consumption tax)


Related reports:
BMW 320i Teardown: B48 2.0L inline 4-cylinder engine (Mar. 2020)