Understanding AFR

Taking this course will give you a solid understanding of how and where to set the air fuel ratio when tuning any engine. A key aspect to choosing the correct AFR is understanding that every engine is different and you can’t approach each tuning job with the same air fuel ratio targets. This course will explain how the air fuel ratio effects combustion, economy and emissions, and in turn how this effects our tuning requirements. You will learn about the different areas of engine operation and how the fuel requirements of the engine vary as load and rpm change. Most importantly though, you will learn a simple four-step approach to deciding on the correct air fuel ratio for your engine. These steps include:

  1. Analysing the operating specifics of your engine
  2. Defining a starting target AFR map
  3. Tuning the engine
  4. Evaluating changes in AFR

At the end of this course you will have the confidence to choose the correct air fuel ratio for any engine and any application, ensuring maximum performance and reliability.

What you will learn
  • What AFR (Air Fuel Ratio) and Lambda mean
  • How the AFR requirements change with load and rpm
  • How the AFR requirements vary for different fuels
  • How to find the correct AFR for your particular engine
  • How AFR effects power
  • How AFR effects the knock

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Course Curriculum

  • Introduction 01.42
  • What is AFR? 01.10
  • Disclaimer 01.08
  • How to use this Course 01.34
  • Tools of the Trade 02.27
  • Calibrating Your Wideband 02.51
  • Defining AFR 00.42
  • Stoichiometric AFR 01.30
  • AFR vs Lambda 04.22
  • Setting the Stoichiometric AFR 04.26
  • How AFR Effects The Engine 01.50
  • Effect of AFR on Knock Threshold 02.16
  • Effect of AFR on Emissions 02.06
  • Effect of AFR on Economy 09.33
  • Effect of AFR on Power 14.14
  • AFR vs Fuel Type 02.12
  • Lean Tuning 02.56
  • Effect on Exhaust Gas Temperature (EGT) 10.41
  • The AFR Target MAP 01.47
  • Idle, Cruise and High RPM Vacuum 03.27
  • Start-up and Dead Zones 01.35
  • Full Load N/A - Transition F/I 02.28
  • Medium Boost/High Boost 01.28
  • Filling In The Gaps 00.58
  • Special Circumstances 03.26
  • How to Choose the Correct AFR 00.52
  • Step 1 - Operation Specifics 01.59
  • Step 2 - Target AFR MAP 02.26
  • Step 3 - Tune The Engine 01.51
  • Step 4 - Evaluating Changes in AFR 02.53
  • Fuel Compensations 00.42
  • Air Temperature Compensation 04.05
  • Engine Load Compensation 02.27
  • Ignition Compensation 01.40
  • Conclusion 01.14
  • Request Certification 00.06

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