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What is the leanest and richest AFR that is typically considered "safe"? I have done some searching on the web and I've seen people talk about the ideal AFR settings
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04-17-2014, 07:39 AM
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Base Member
 
Join Date: Nov 2012
Location: Michigan
Posts: 78
Drives: 12 Nissan 370Z PG M6
Rep Power: 13  |
What is a safe NA AFR?
What is the leanest and richest AFR that is typically considered "safe"? I have done some searching on the web and I've seen people talk about the ideal AFR settings with a tune, and people warning of leaning out a car. But at what point is the AFR considered too lean that it hurts the engine? Anything above 13 under full load or 14.7 at idle or is there another general AFR point that I am missing? From what I have seen, ideal power is 12.5 (rich) to 13.5 (lean) but under normal cruising and idle, you want to be around 14.7. Would idle or cruising at 15, 16, or 17 be alright? Or is where the AFR falls under load what is important?
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