HPAcademy Understanding AFR Course

Description 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: Analysing the operating specifics of your engine Defining a starting target AFR map Tuning the engine 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   Course Curriculum INTRODUCTIONIntroductionWhat is AFR?DisclaimerHow to use this CourseTOOLS OF THE TRADETools of the TradeCalibrating Your WidebandDEFINING AFRDefining AFRStoichiometric AFRAFR vs LambdaSetting the Stoichiometric AFRHOW AFR EFFECTS THE ENGINEHow AFR Effects The EngineEffect of AFR on Knock ThresholdEffect of AFR on EmissionsEffect of AFR on EconomyEffect of AFR on PowerAFR vs Fuel TypeLean TuningEffect on Exhaust Gas Temperature (EGT)THE AFR TARGET MAPThe AFR Target MAPIdle, Cruise and High RPM VacuumStart-up and Dead ZonesFull Load N/A - Transition F/IMedium Boost/High BoostFilling In The GapsSpecial CircumstancesHOW TO CHOOSE THE CORRECT AFRHow to Choose the Correct AFRStep 1 - Operation SpecificsStep 2 - Target AFR MAPStep 3 - Tune The EngineStep 4 - Evaluating Changes in AFRFUEL COMPENSATIONSFuel CompensationsAir Temperature CompensationEngine Load CompensationIgnition CompensationCONCLUSION