Originally Posted by
Romulus
What fuel are you using? You'll find a different STFT and LTFT for E10, 91, 95 and 98 octane fuels. Each fuel has a different calorific value/different burn rate. 91 Octane fuel burns the fastest, but has the least resistance to detonation. It should theoretically show the lowest value fuel trim, where as the slowest burning fuels will show the highest trims if the spark values are not changed.
You'll need to adjust the spark tables accordingly if you're using flex fuel or E85.
As turbotrana said I wouldn't worry about the transport delay unless you intent putting the O2 sensors in the tail pipe. Most shops don't bother with it.