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Mark G Senior Member
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1,935 Posts
At cruising the computer is going to want to dial it into 14.5. the problem will be if you step into it and you start to go into wot.... Too rich you can wash out the cylinders and to lean you can burn it up...
 

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Greg
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19,974 Posts
Pre-ignition is usually the first indicator that you have exceeded a safe limit. AFR is only a measurement of fuel/air where timing and load also play an equally important part in a tune. A engine running a light load can stand a lot more timing and leaner AFR than one thats wot under full load of acceleration. Each engine/vehicle is different. I start out running fat and tune toward a leaner condition. I wpuld suggest on a mostly stock engine to start with a stock tune and adjust the tables you understand to observe their effects on the tune. Keep your changes under 5% and limit the changes until you see a trend that is understandable..
 
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