lamba readings

hi,
not sure where you guy's have lamba readings or you tune by squish on big end bearings.
If so, what is the mathermatical equation that lamba converts back to air / fuel ratio?

Thanks

 

Lambda = (actual A/F)/(stoichiometric A/F). Stoich is 6.45:1 for pure methanol, for example. If your Lambda reading is .8 according to the wide band, then the actual A/F ratio is (.8)*(6.45) = 5.16 pounds air per pound of meth. Make sure that the WBEGO is up to temp and that no ambient atmosphere is being entrained around it. Each fuel will have its own unique stoich value.