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Old 06-19-2017, 08:46 AM   #1 (permalink)
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Lighspeed has their car in neutral right now
Safe AF Ratios for idle and Cold Start

Hello. I would like to know which are safe Air/fuel ratios for the civic SI, especially during a cold start.

Is it 14.5 considered unsafe /lean although it is near stoich?.

Also, at WOT outside VTEC is it safe to be at around 14.1-13.9?

While in VTEC, I've heard that 13.2-12.5 are recommended.

Is it Ok to be at those AF ratios in a Civic SI?


Thanks for your input!.

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Old 06-19-2017, 10:29 AM   #2 (permalink)
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Gary
killswitch21 just put it into 1st gear on 8thcivic
I wish I could help a little more, but I do know 14.7:1 is the target AFR for idle, and 13.1:1 is target AFR for WOT.
At least when not heavily modified.

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Old 06-19-2017, 11:28 AM   #3 (permalink)
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Lighspeed has their car in neutral right now
Thanks, killswitch21. I currently have basic bolts on, planning on adding a catback exhaust in the upcoming months.

That's reassuring. I though I was running lean in the mornings, because my car (with the current stock flashpro calibration) is idling at about 14 even though the engine is cold.

I guess I was used to my old B series, where the cold start idle was tuned at about 13.1 when cold started.
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