Anyone have any cold weather tuning tips? I've tried quite a bit of different tunes and have it capable of starting on the new motor fairly easy down to 15-18 degrees but below that it does NOT want to start. Let me know if you see anything from the datalog regarding pilot / main duration and timing that you think can get a fire going. Things I've found helpful so far:
1 - use the ECT modifier table. For the 2003 its not an "adder" table as labeled. Rather, it is a minimum timing table so once you multiply the ECT table by the ECT multiplier, that is the timing value minimum you will see commanded.
2 - adding a little bit of cranking timing and reducing duration in high MM3 low RP areas improved starting from the 30 degree range down to now having similar or slightly faster starts at 18 degree ECT temps.
Its quite possible there isn't much left to adjust without the grid heater and on a lower compression motor with bigger injectors (flycut pistons, 188/220 cam, and BB2 injectors), but open to opinions and ideas. I usually plug my vehicle in every winter but had a scare last year before the motor rebuild where it didn't want to start and almost stranded me so all of my tuning efforts are for peace of mind in case I have to leave the truck in an area without electricity overnight again.