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EFI AFR Table

D

David G

Well-known Member
This is the AFR table that is in my EFI, I could probably tweak more, but it works pretty good.
a229158.jpg
 
Air to Fuel Ratio. Higher number is more air, lower number less air per volume of fuel. Looks pretty rich up near the higher end.
 
My experience with AFR is automotive performance and I would probably want it a little more rich at full load, high RPM. maybe 11.5-12. I'm not sure a tractor engine would benefit from such though and the torque might be a little better around 12.5-13 anyway. Also I assume those ratio's will be an average since you can't trim to the fuel precise enough to keep it exact, so your real values would have low/high peaks to maintain the set parameter.

What do you have to measure engine load, or air flow/density?
 
I appreciate the feedback, I am a little concerned with only going to 12.9 at full load, but have not had time to check that against the exhaust temperature. I am really finding that it is a two man job to tune this. I believe the computer uses the manifold vacuum to determine load %. It seems like the load pops to 60% pretty quick, then takes a lot to get to 90%. Suggestions are welcome on adjustments.
 
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