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Originally Posted by sdminus
Cool cheers richard.
One thing i keep milling over is this ratio. i have been told by many to tune for 12 afr with 10-15 %water. but my base map will be about 11.1:1 so say 0.76 lambda.
i would say 10 % of this would be 0.076 lambda
so if i subtract this i get 12.2:1 or 0.83 lambda
So if i tune for 12.2:1 and add the 10% water would i not be tuning for an equivelant of 30 % more fuel or 0.228 lambda
if so then the new mixture would be the equivelant of 0.60 lambda or 8.82 on petrol. I am told water is 1/3 more efficent than fuel. COuld it be that we are over watering our cars. These figures seem a little extreme but i am no maths expert.
Scott
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I am not sure if you are interpret the 12afr and 10-15% water as a means of replacing "fuel for burning" or "fuel for cooling". I got the impression that you are trying to relate to the former (buring) rather for the latter (cooling).
The main purpose of adding water is for cooling. Adding water will not alter the afr but it will alter the in-cylinder temperature. An engine will have the highest combustion temperature as it approachs lambda 1. Combustion temperature on either side of lambda1 will be lower. I am not saying you achieve maximum power or manximum torque at lambda=1.
I am not sure if that is what you are trying to discuss, but please tell me I am off track.
Richard