AFR and Lambda. Flex fuel tune

[LG23]

Trying to get a better understanding of AFR and lambda. New to this Lambda thing. Running a Lund flexfuel tune with 93 pump gas and the alch% learned to 9.8% so it looks good. Lambda stays .99-1.01 at idle and stays at .85 at WOT so it seems to be great.

My question is: as long as lambda stays at 1 for idle and .85 for WOT, does AFR even matter at all?

I notice on the car dash it reads idle AFR at 13.8-14.3 and WOT at 11.8. However, on the N-Guage signals for AFR 1 and 2 it shows 14.4-14.9 for idle AFR and since it shows about .5-.6 higher on the N-Guage signals I assume about 12.3 for WOT. Which one is more accurate?

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[SolarFlare]

Lambda, stick to it. 1.00 is stoich mixture, less than 1 is richer than stoich. .84-.85 is good.

 

[DarkestHour]

lambda is the only thing that matters

 

[Legionofone]

They are both the same thing. AFR is a ratio of air to fuel, Lambda is a calculated number based on AFR for a given fuel.

 

[dubster99]

In the neighborhood of .85 is good, plus or minus a hundredth or so.

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