EFI: CO value (FI-diagnostic) vs. A/F ratio

Today I played with the CO adjustemt tool, while having the O2 sensor connected.

Guys, make sure you are seated well: :p

 

CO   O2 Voltage

-21  0.91

-21  0.92

-22  0.90

-22  0.88

-23  0.79

-24  0.79

-24  0.61

-25  0.79

-25  0.71

-26  0.08  "lean" :thumbsup:

 

So my bike with my muffler/header and open airbox door (FI diagnostic tool)

develops lean idle only with a CO value below -25

That's right. Everything above -25 is on the rich side. 

 

So I dialed in -24 and through all my subequent freeway racing O2 sensor experiments (see other thread)

chopping the throttle closed got my some high 0.8, 0.9 reading,  CO -24 is A/F ratio wise rich idle !

 

YMMV

 

CO-21 (2).jpg

CO-21.jpg

CO-22 (2).jpg

CO-23.jpg

co-24 (2).jpg

CO-24.jpg

CO-25 (2).jpg

CO-25.jpg

 

finally, at CO value set to -26 there is lean idle mixture:

CO-26.jpg

 

 

Guys, please let's try and keep that thread focused on CO setting and idle mixture only.

A/F ratio and mapping is here:

http://www.thumpertalk.com/topic/1143752-efi-powertuner-maps-vs-af-ratio/

Edited by WRF-Rowdy

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