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Need to remember, these engines run a closed loop fuel system, even at full load. Fuel air mixture will always match the target map in the tune. At least until Cat protection kicks in and starts dumping more fuel.
DME measures the exhaust and wil adjust fuel mixture to match target values, in real time. Minor engine modifications will only require small trim changes. There is a limit, if the required trim percentage exceeds the allowable limit, you will receive an SEL.
Stock tunes are targeted Rich above 6,500 RPM.
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