Multiple Injections: Pilot, Main, Post

🧠 Part of the TuningBot ECU Knowledge Base — in-depth documentation on ECU logic, maps, emissions systems and safe calibration methods.

Modern common-rail diesel engines inject fuel multiple times per combustion cycle to reduce noise, improve emissions, and optimize efficiency.

Injection Sequence

  • Pilot injection — small amount 10-30° BTDC, reduces noise
  • Main injection — primary fuel for power
  • After injection — extends combustion, reduces soot
  • Post injection — late injection for DPF regeneration

Calibration Implications

  • Reducing pilots increases noise significantly
  • Main timing affects power and efficiency
  • Post injection requires functional DPF

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