KGP
09-26-2008, 07:10 AM
Let me clear up some misconceptions I have had from people contacting me about tuning with E85
First off... I dont know where people are getting this from, but Stoich on E85 is NOT .7 Lambda
1 Lambda IS Stoich... no matter what fuel you are running.
Lambda indicated a rich or lean condition. 1 Lambda indicates no excess fuel or air in the mixture.
Stoich (Stoichiometry) is a standard calculation to determine how much of each reactant is required to make the products of the reaction. In this case, we are trying to figure out at what perfect ratio there will be no air of fuel left over.
Since most people are more familiar with A/F (Air / Fuel) ratio, it is easier to understand expressing lambda in A/F
Gasoline achieves 1 Lambda at 14.7:1 A/F
Alcohol achieves 1 Lambda at 6.4:1 A/F
E85 achieves 1 Lambda at 9.8:1 A/F
First off... I dont know where people are getting this from, but Stoich on E85 is NOT .7 Lambda
1 Lambda IS Stoich... no matter what fuel you are running.
Lambda indicated a rich or lean condition. 1 Lambda indicates no excess fuel or air in the mixture.
Stoich (Stoichiometry) is a standard calculation to determine how much of each reactant is required to make the products of the reaction. In this case, we are trying to figure out at what perfect ratio there will be no air of fuel left over.
Since most people are more familiar with A/F (Air / Fuel) ratio, it is easier to understand expressing lambda in A/F
Gasoline achieves 1 Lambda at 14.7:1 A/F
Alcohol achieves 1 Lambda at 6.4:1 A/F
E85 achieves 1 Lambda at 9.8:1 A/F