Write entire to VCM question

[07cobaltsupercharged]

I brought up a tune from the HPTuners repository for a 07 supercharged Cobalt and then clicked OS tab on it and this came up in thumbnail below.

If I download the stock tune first off the car and then copy/pasted parameters/changes from repository tune over to stock tune file and re-upload changes is it still going to be a write entire function or is it saying this because ive opened a repository tune instead of factory tune off the car and it thinks im going to upload the repository tune?

Im used to doing Gen lll tune tweaks and re-uploads and always do a write calibration only on all of them and never got a box when I click OS tab before saying must do write entire so maybe its cause the Cobalt has a different pcm?

Thanks

[Bill@HPTuners]

A write entire is only necessary when changing operating systems, this is explained in our help file www.hptuners.com/help which is a must read for anyone starting out.

[Keith@HPTuners]

If changes are available on that particular tab, and you make one of those changes, for that change to have effect the write entire must be performed.

[07cobaltsupercharged]

A write entire is only necessary when changing operating systems, this is explained in our help file www.hptuners.com/help which is a must read for anyone starting out.

So when I actually go to upload this repository tune to another 07 Cobalt then it wont say write entire because the tune is going to same year car that I got off repository once I plug in my interface. I guess that screen came up above example cause I wasnt actually plugged into a Cobalt with my interface I guess.

[Bill@HPTuners]

So when I actually go to upload this repository tune to another 07 Cobalt then it wont say write entire because the tune is going to same year car that I got off repository once I plug in my interface. I guess that screen came up above example cause I wasnt actually plugged into a Cobalt with my interface I guess.

If you are changing operating systems you must use write entire. That screen is the same on every file in that any os changes or patches need a write entire.

[07cobaltsupercharged]

If you are changing operating systems you must use write entire. That screen is the same on every file in that any os changes or patches need a write entire.

I guess im confused in thinking im not changing OS because its a 07 Cobalt file I have going back to a same year 07 Cobalt so I thought it would be same OS for both files/cars and not have to do a write entire. I need to go read some more on this..

[Bill@HPTuners]

If you are not changing operating systems why are you looking at the OS tab? You are only confusing yourself.

[07cobaltsupercharged]

If you are not changing operating systems why are you looking at the OS tab? You are only confusing yourself.

Yea I know that now! I just happened to click it and started wondering why it said that....

Sorry bout that but I sure learned a lot more by going back in and reading what goes on when changing OS.

Thanks guys!