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Originally Posted by steviek
Well from doing a little searching and a lot of reading on air fuel ratios I was thinking it would be best to have it all somewhat in summation.
The first thing that is to be noted that it appears that the best stoichometry for N/A Cars is 12.6-12.8/1 and for boosted cars slightly leaner at 12-11.5/1....If you have other numbers please throw in your 2 cents.
Boosted cars utilize leaner A/F ratios to prevent engine "knock" or unwanted detonation.
Therefore, I've noticed that the factory ECU on DSM"s is running about 14% too rich.
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You have it backwards. 11.5 is richer than 12.6. stoich is 14.7 and boosted cars run richer to prevent knock but other than that your numbers are right