[Diy_efi] WBO2 and AFR

[Michael Richards]

I neglected to cover the point past which the wideband controller 
begins to use it's HC part of the sensor to determine how "rich" the 
mixture was. Point I was trying to make is that oxygen rendered by the 
combustion, for example in oxygenated fuels ought to be cancelled out 
in the equation. 

Correct me if I'm wrong but widebands measure the lambda and 
mathematically convert the result to AFR. I primarily tune with AFR 
only because that's what most people understand. 

I feel like those who stick their noses up and point at the lambda 
difference are the same group who will correct one calling a 
recirculating valve a BOV. Both issues they are technically correct 
but neither makes the customer feel good about themselves as they 
discuss the setup with the tuner.

So in a sense I think that those of us who use the AFR numbers are 
actually using lambda but not realising it. Thoughts anyone?

-Michael

>>> Would you not consider a stoich mixture of fuel one
>>> that consumes all the available oxygen?
> 
> A guarded No.  The reason being stoich implies burning the available
> fuel AND oxygen present.  You can burn whatever available oxygen
> there is, but still have left over fuel looking for their share of
> oxygen molecules.    Still not stoich, but in lieu of above, I prefer
> to state mixture as one that burns what ever fuel is available.
> 
> 14.7 was chosen as stoich, as this results in the least amount of the
> various components/products of combustion recognized as harmful.
> IOW, a compromise.

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