03 Custom OS ?

[kbracing96]

Forgive me if this has been asked and answered, but I couldn't find it anywhere. I have a turboed 01 GMC truck with a 12208322 OS and want to up grade to the custom 03 OS for obvious reasons. Do I need to load the 01 OS and appropriate .cal and .tun files first, and then load the 03 OS? Or can I just load the 03 OS and which .cal and .tun files should I use? Thanks

[BowlingSS]

Just load the 03 OS and the correct cal file. Check out the Custom OS Tune Doc in the download section. I went straight to the 03 OS. The DOC tells you everything you need to know.

http://www.efilive.com/doc/Tutorials/Custom%20OS%20Upgrade%20Tutorial.pdf

Bill
:D

[kbracing96]

Cool, that's what I thought, but I wasn't sure, so I thought I would ask. I'm going to play with it tomorrow. Should be fun, I can't wait to get the command A/F table setup and working. Especially with gas prices going were they are :shock: . Thanks!