Ideal AFRs
05-14-2012, 12:16 PM
#1
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2010 E350, 2011 ML350, 2003 996TT
Ideal AFRs
Got my ECU reflashed by Jerry and the car feels great now. I'm going to get it on the dyno again to see what power it is making and to get AFRs since I don't have data logging yet. What is the ideal AFR on these cars?
05-14-2012, 12:21 PM
#2
MBWorld Fanatic!
There really is NO such thing as the perfect AF ratio, per say.
Too many variables to pick an exact number.
Anyway, 12.0 is a very good starting point, some like it a little richer say 11.0 as it is a little safer. Anything in the 14's and say by, by motor under boost with today's lousy gas.
Anything below 10, and you are leaving alot on the table, and risking wash down.
Remember, even though these are hand built engines, there will be differences in them all.
By the way, the perfect ratio, aka theoretical, is 14.7. Just don't expect a FI motor to live long under that one
Too many variables to pick an exact number.
Anyway, 12.0 is a very good starting point, some like it a little richer say 11.0 as it is a little safer. Anything in the 14's and say by, by motor under boost with today's lousy gas.
Anything below 10, and you are leaving alot on the table, and risking wash down.
Remember, even though these are hand built engines, there will be differences in them all.
By the way, the perfect ratio, aka theoretical, is 14.7. Just don't expect a FI motor to live long under that one
