Understanding AFR Tuning
Apr 10, 2013, 01:30 PM
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Understanding AFR Tuning
Trying to better understand the correct AFR during different "phases" of driving. From Merlin's bible:
"Setting your AFR depends to a large extent on the boost and timing that your car is running. I generally set the AFR at 12.5-12 during spool up, 11.7-11.5 during peak boost, and then slowly taper the AFR until it hits 11-10.8:1 by the 7500rpm redline point."
So basically, during those particluar RPM/Loads, those are the ideal AFR? How does boost plays into it like would peak boost of 19 PSI should have different AFR than 30 PSI? If yes, how does one know what's a safe AFR for different boost/spool up, etc?
"Setting your AFR depends to a large extent on the boost and timing that your car is running. I generally set the AFR at 12.5-12 during spool up, 11.7-11.5 during peak boost, and then slowly taper the AFR until it hits 11-10.8:1 by the 7500rpm redline point."
So basically, during those particluar RPM/Loads, those are the ideal AFR? How does boost plays into it like would peak boost of 19 PSI should have different AFR than 30 PSI? If yes, how does one know what's a safe AFR for different boost/spool up, etc?
Apr 12, 2013, 09:56 AM
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More boost = More air = leaner mix, But not entirely. More boost = higher load. In terms it should hit richer mixture if your map is nicely smoothed. Making it safe enough for you fine tune the AFR.
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