Just dynoed my car again with Kinetix high flow cats on it, A/F was reading about 12 ~ 12.2 is this too lean?



Colin

 

thats probably pretty safe. The richest I have seen on my stage 3 is 11.5 during the 1/4 mile, but its usually low 12s.

 

It turns out that my top supercharger belt is defective and stretching, the tensioner is slack as all hell, so I am probably not even at full boost yet .... I'll probably dyno again once the new belt goes on just for comparisons sake...

The last dyno I did I was running 6.5lbs at redline ...

Colin

 

eyah, you might want someone to tune in a bit more fuel

17.5 is really lean

try for around >13

 

Read the chart, not the max numbers.


You're ok IMO if the reading was taken at the exhaust tip. Figure on around 6-8% lower numbers in the engine, unless the dyno operator used some correction.