[Maddawg58]

What are the optimal CAN Air/Fuel Ratio values depicted on our chart 3rd gear 3000-7000? **Answer** from shiv..."There is no ideal AFR"

Here's what I'm piecing together so far.....

10.2:1 - Stock no tune
10.5-11:1 - Too rich (from shivs comment below)
12.0:1 - Tuned baseline
12.5-11.5:1 - Vishnu Map 1 & 2 normal range under load

Found this from 2008:

"There's no "ideal" AFR. There are guidelines and rules of thumb. But little of it applies to direct injection applications. What we do know is that traditional high boost turbo max power AFRs (10.5-11.0:1) result in over-fueling in the case of the N54."
-Shiv

What is the normal range and when will this diverge? What is logging this telling me? Can it tell me if I have a pre-post cat exhaust leak? Bad o2 sensors? etc.?

Trying to paint a definitive picture of AFR and the value it poses in logging it....