Modifications to ECU parameters that produce special effects aren’t exclusive to petrol engines. Turbo diesel engines can also deliver a thrilling performance! Known for their durability and fuel efficiency, these engines were widely used by car manufacturers, especially in the early 2000s.
For diesel engines, where it’s not possible to cut ignition (unlike petrol engines with spark plugs), the REV limiter is achieved by sharply cutting off fuel injection at a specific RPM. This results in a sudden drop in engine speed, followed by a quick rise, creating the desired sound effect.
To activate the REV limiter on a diesel engine, adjustments need to be made to several ECU parameters, depending on the desired effect, including:
It’s important to note that there are two types of limiters: “Hard REV” and “Soft REV”.
Thanks to the maps available in the driver for the Bosch EDC16C35 ECU, installed in several BMW diesel models, such as the 330D E92, you can precisely activate and customize the intensity of the REV limiter. This guide will show you how to adjust the torque, fuel, and injection timing maps to achieve the desired effect. We will use ECM Titanium software for these modifications, as it allows you to:
Torque limiter tuning: the first step involves setting the maximum torque limiter value near to zero at a specific RPM across all gears. This defines the RPM at which the limiter will activate to create the REV limiter effect.
Modifying fuel injection maps: similarly to the torque adjustment, you must zero the fuel injection values at a specific RPM, selected based on your needs.
Injection Timing map adjustment: this adjustment is crucial for achieving and regulating the intensity of the Hard REV. It’s this operation that differentiates the behavior of the limiter between Hard and Soft REV.
