What does rich or lean mean? Which one is best? Theory AND practical demonstration on our Mainline dyno.How does your AFR influence engine performance, speci
Grab a screwdriver and start adjusting. I cannot stress how complicated this process so be very careful. Tighten the fuel mixture by turning the fuel mixture screw clockwise; this will make it leaner because it will reduce the amount of fuel getting it. When the engine starts sounding rough, turn the screw clockwise.
A quality tune starts with accurate air-fuel-ratios (AFR), and the Power Vision uses an embedded function to help you dial in your AFR. This function is referred to as Autotune Basic and while you ride the Power Vision calculates the adjustments required to your tune to achieve an optimized AFR.
It is best to tune so that the air/fuel plot is fairly flat. Tuning Fuel at part throttle. To tune the fuel for part throttle the aim is to get the air/fuel ratio so that the engine will run correctly in closed loop. Normally the closed loop air/fuel ratio will center around the stoichiometric air/fuel ratio of 14.7:1, so it is best to tune the Option 2 - Disable NN and use Volumetric Efficiency Tables (VE): From the few I have seen the factory VE tables need a lot of work. Cold start tables also need work. a - set desired AFR. b - disable baro learn (has been said to be a complete multiplier for tune and may cause uncontrollable swings)
Theoretically, the ideal stoichiometric A/F mixture (the chemically ideal mixture of air and fuel that is required to provide a complete burn) for a properly tuned engine running on pure gasoline is 14.7:1; that is, 14.7 lbs. of air to 1 lb. of fuel. However, because of operating losses in the induction system due to intake runner and cylinder
If we multiply the stoichiometric air-fuel ratio of gasoline (14.7:1) times a Lambda of 0.85 we get 12.5:1 which is a safe air-fuel ratio to start with gasoline for WOT tuning. Remembering that Lambda is always 1.0 for any fuel makes part-throttle tuning far easier than trying to remember the max-power air-fuel ratio of different fuels like E30
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    • how to tune air fuel ratio