Episode 2 – Two-Stage Oil Pressure Control Systems (Bosch EDC17 ) Series

Engine Platform

• 3.0 V6 TDI / BiTDI

ECU Platform

• Bosch EDC17CP44 / CP54 / C76

Vehicle Applications

ECU Tables Adjusted

• Oil Pump Solenoid Activation RPM Table: Determines engine speed at which ECU switches pump from low to high pressure.
• Oil Pressure Target Map (RPM / Load): Defines pressure thresholds for low/high-pressure stages.

Why Adjust These Tables

• Engines with high low-end torque may break oil film if high pressure mode is too late.
• Lowering solenoid activation RPM ( 2---- → 1----- RPM) increases oil pressure earlier, ensuring lubrication under load.
• Adjusting pressure targets improves bearing protection, avoids oil starvation, and allows safe performance tuning.

Practical Tuning Notes

• Incrementally adjust activation RPM while monitoring real-time oil pressure.
• Avoid excessively high pressure to prevent pump wear or seal damage.
• Diesel engines with increased low end torque benefit most from earlier stage switching.

Schiller Tuning Case Insight

In Audi A6 3.0 BiTDI tuning, we safely increased low RPM oil pressure by ~15%, preventing bearing wear during high torque runs on the dyno. Students practice ECU mapping, table adjustments, and real-world verification.