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When tuning the MAF for a Desired 12:1 A/F-R, you adjust this every 200-500 RPM until goal is acquired.

Desired A/F Ratio Multiplier Conversion

When trying to get a 12:1 A/FR, use the answer for the Y Axis multiplier correction that is in the output below.

Factor to use to get a 12:1 A/FR: