OS or Cal ID

[TNT]

have a 07 3500 c&c with OS 11720604 found clean tune with same Cal ID 55351435bf but different OS . I assume this will work fine but do not understand how same Calibrations can have different OS. Makes it hard to run Comparisons in 7.5 . Does anyone know how to make tuning program run comparison.

[GMPX]

Check the CalID again, it is usually the last two letters that change with an OS update, eg 55351435BF might go to 55351435BG

[TNT]

Check the CalID again, it is usually the last two letters that change with an OS update, eg 55351435BF might go to 55351435BG

Thanks for the reply & I understand how the CalID update numbers progress, just don't understand how same cal have different operating systems. This makes it impossible to run comparisons in the tune tool. Even though the calibration ID is the same. Is there any way to compare across operating systems?

[GMPX]

Can you give a specific example of where they have the same CalID and have different OS's?
V7 cannot compare between different OS's unfortunately.

[TNT]

Can you give a specific example of where they have the same CalID and have different OS's?
V7 cannot compare between different OS's unfortunately.

Yes, CalID 55351435BF with an OS of 11720604 clean tune has CalID 55351435BH but operating system #11551035.

[GMPX]

55351435BF = OS 11720604
55351435BH = OS 11551035

The CalID revision is different, am I missing something?

[TNT]

55351435BF = OS 11720604
55351435BH = OS 11551035

The CalID revision is different, am I missing something?

it is the same calibration just the updated version. If you look up that calibration on Tech Authority they all supersede to 55350435BH.

[GMPX]

Ok so the base calibration (55351435) is the same with updates but that does not mean they are exactly the same which is why they went from 'BF' to 'BH'.
This is the full list of revisions, each one will have a different Cummins OS too...

55351435AZ
55351435BA
55351435BD
55351435BE
55351435BF
55351435BH

This number / letter combo is not a Cummins thing, it is only used by Dodge.They do the same thing on the gas ECM's.

[TNT]

So every calibration update by dodge generates a new OS. 07.5 DODGE 6.7 AUTO 50S 3500 DR - RAM 3500 PICKUP
ECM 05179028AB 05179028AC 05179028AD 05179028AE 10525505BT 10525515BT 55350105AO 55350105AP 55350105AQ 55350105AR 55350105AT 55350115AO 55350115AP 55350115AQ 55350115AR 55350115AT 55350235AU 55350235AV 55350235AW 55350235AX 55350235AY 55350435AZ 55350435BA 55350435BD 55350435BE 55350435BF 55350435BH 55351105AT 55351115AT 55351235AU 55351235AV 55351235AW 55351235AX 55351235AY 55351435AZ 55351435BA 55351435BD 55351435BE 55351435BF. All these calibration changes update to cal 55351435BH and will all have a deferent OS#. No way to change OS# to trick tune tool into comparing them?

[GMPX]

All these calibration changes update to cal 55351435BH and will all have a deferent OS#.
There is no set rule to this unfortunately, but typically when a new CalID comes out the OS is also different, we have 26 unique OS's mapped for the 07-09 so there is lots of updates out there.


No way to change OS# to trick tune tool into comparing them?
No, it wouldn't work anyway as the maps in each OS are located in different spots.