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Discussion Starter #1
Hello,

I have a 2010 FN2 CW and I just purchased Hondata flashpro and CPL racing manifold. I was wondering what is a safe/good AFR for a FN2 with this mods? Also anyone knows the stock AFR?
 

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I see. So a 13.2:1 is too lean .....this is what i have now . Should i be worried? Should I lower it to a safer ratio?
 

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Most of the time you are running closed loop.
Which should be 14.7:1 AFAIK...Im sure Ill be corrected :D
However for max power and safety reasons.. at full throttle app. 12.8:1 gives best power.
14.7:1 is the stoichimetric point where all of the fuel is burnt comlpetely.
Richer than this and unburnt fuel get sent down the exhaust.
Weaker than this and combustion temperatures rise.
Go too rich and you get bore wash issues.
 

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I see. So a 13.2:1 is too lean .....this is what i have now . Should i be worried? Should I lower it to a safer ratio?
For N/A it's 12.5-13.3 considered as safe but different AFR might produce different power. It's like Honda likes ~12.8:1 other cars might like 12.5:1 etc.

For 13.2 I woudn't worry too much.
 

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:lurking:
 

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I see. So a 13.2:1 is too lean .....this is what i have now . Should i be worried? Should I lower it to a safer ratio?
If it is a consistent 13.2:1 and you are running in open loop at WOT then that is nothing to worry about. You actually make slightly more power on the leaner side, so if you are not recording any knock then no need to go richer.
 

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Discussion Starter #8
ok guys....thank you. Tomorow i will be going to Hungaroring for a trackday. Hope everything will be fine
 
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