Hi, you can download tuneboy from the site and then you can see the maps and operations.(its free)
There are 2 maps to load from tuneboy trek02 and trek05. The treko2 map has a o2 sensor enabled,rev limit of 9600,idle of 1300rpm,exhaust flap operation at some low rev situationsThe trek05 map has 02 sensor dissabled,rev limit of 10200rpm,idle of 1350rpm,
it also has a basically richer fuel map,more ignition advance at top end and less advance at bottom end.All of the above should be able to be modified,also the fan on/off temps.
Are ther some treks with 02 sensor and some without ?
Email Wayne mcdonald to confirm my guess is right.
colin. PS,I am replying as there may be no one yet who has used tuneboy on a trek.