BMW 3.0CSi Parts & Accessories

BMW 3.0CSi Parts & Accessories

The BMW 3.0CSi upgraded the elegant E9 coupe with Bosch D-Jetronic fuel injection, giving the M30B30 sharper throttle response and improved emissions compliance compared to the carbureted CS. These fuel-injected coupes are prized for their combination of refined technology and classic Grand Touring character.

Popular Upgrades

A performance cat-back exhaust system liberates the CSi's M30B30 while respecting the car's refined character. Suspension upgrades including polyurethane bushings and sport-spec dampers noticeably sharpen handling on the E9 platform, while stainless brake lines and quality pads bring stopping power up to modern standards.

How does the 3.0CSi injection system work?

The D-Jetronic system uses a manifold pressure sensor and intake air temperature to calculate fuel delivery, without a mass airflow meter. Maintenance involves cleaning the throttle body, checking injector spray patterns, and ensuring the cold-start valve and auxiliary air regulator function correctly for smooth cold starts.

Can I tune the BMW 3.0CSi fuel injection for more power?

Yes, though D-Jetronic tuning is specialized. The most accessible path is to port and polish the head, improve the exhaust system, and ensure the injection system is functioning optimally. Conversion to modern EFI is possible but changes the car's originality, which many CSi owners prefer to preserve.

Find quality parts for your BMW 3.0CSi at Black Ops Auto Works. Shop our exhaust, suspension, and brakes collections.