Thread: Timing Maps for Tuning

For sure, probably 20 degrees F warmer. I figured that was a major factor, since TP is proportional to airflow and cooler temps means more mass air flow.

so is 112 high for my setup? I do move a lot of air.

come talk to me in IRC!

I guess it is too high then. You probably will be save setting it at 100TP.

Supe what was the AFR under load with this timing map?

Timing can alter you AFRs. If too low it can make a car pig rich. I have seen this happen when tuning.

Yup legitimate question.

I think you have that backwards. Retarded timing produces what appears to be "lean" readings because there is still plenty of unconsumed oxygen entering the exhaust. Highly advanced timing shows results that appear to be "rich" because much more of the oxygen is consumed before entering the exhaust.

This is all assuming the same exact fueling.

Thanks captain obvious... Still doesn't fix your silly question.



Not really. Don't have fuel map. If he asked for fuel map AND AFR then it is.

As I said I have experienced this where the timing being low caused an overly rich AFR. If there isn't enough timing to burn the fuel then your AFRs are going to richen up especially when load increases in the 5k-redline area. Of course the degree of timing that can cause such situations varies from car to car.

Don't get me wrong I am not saying you are incorrect, however I am just stating what I have experienced as well as citing the reasons.

Wnwright the question isn't silly, you just did not understand it. The question was asked under the assumption, that the vehicle was consuming a safe amount of fuel thus it presented with safe AFRs. As such I did not see the need to question supercowboy about his fuel map, as he seems very competent in what he is doing.