Originally Posted by ooja3k
So I guess all the selec-terrain changes take place within the transmission / transfer cases huh??
Fueling, ignition timing, thottle sensitivity, transmission shift schedules, etc are kept in tables. I'm guessing there are multiple copies of these tabes for the various select-terrain modes (and for tow/haul mode). When you switch select-terrain modes or tow/haul mode your most likely just telling the PCM / ECU to simply start using a different set of tables.
So a tuner could elect to tune the various sets of tables or even leave them stock. So for example they might elect to increase the throttle sensitivity in normal and sport mode tables but keep the snow mode throttle sensitivity stock.