Help me select a COS

[Hambone]

Ok, I'm new to custom tuning, but have been looking all over the forum for the answer to my issues. Have an LS1B controller with a 2000 OS (12205612) Now I have a turbo and want to use a 2-bar MAP. Thought COS 3 would do the trick, but supposedly I need COS 5 since my controller is 512kb. I have read what to do once the COS is full-flashed, but having a bit of trouble getting there. Am I correct in thinking the COS takes over entirely and doesn't really matter if you had a '99 or '00 OS to begin with? In the COS tutorial it recommends using a '01 or '02 OS. Sooooo...... Which file do I need to use COS 5 (if that's what I need) to get the features of a newer OS (proper e-fan control, 2-bar, etc) with a 2000 LS1B controller? Seems the more I look around on my own, the more questions I come up with. I'm sure many have done this already, can someone chime in?

[ScarabEpic22]

Check TuneFileDepot.com, there are some 99-00 F-body files already setup correctly in the 02 OS. You could use COS3 or COS5, depends if you want the extra features COS5 has. I dont believe you give any features up with COS5 vs COS3, have to check.

Full flash the correct COS5 file into your PCM, then cal-flash the migrated file in. Refer to the COS upgrade tutorial, all the steps are in there and well laid out!

[joecar]

For COS5 (02020005) it will be easier to start with OS 12212156, this allows flashing the cal tables from 12212156 file.

Otherwise with other OS's, you will have to "fabricate" an 02020005 file (populate the cal tables by copying/pasting, this is error prone and time consuming).

[Hambone]

Ok, I pulled down 12212156, its close to what I've got, but of course all the calibration numbers are different. They are pretty close, 9358180 vs 9358280, except the speedo. I originally had 16264796, and the new OS shows 9359140. Is this a concern, or don't worry about the cal numbers? Going from a 2000 OS to a 2002 OS. If that's nothing to worry about, I guess the next step is to make as many of the tables in the '02 OS match what I have in the '00, right? Since the OS's are different, I can't do a compare, so its still a matter of copying and pasting tables? Clearly you can see I've never done this before...

[Hambone]

Seems I have to full flash 02020005 in first, then cal only flash from 12212156?

[Hambone]

joecar, I just found a fantastic post from you on LS1 Tech, and it seems much clearer than me just reading the tutorial. Think I got it now, unless there's a shortcut to getting my current tables into the 12212156 OS....

[joecar]

Seems I have to full flash 02020005 in first, then cal only flash from 12212156?

Yes.


But, you should also see what is different between your file and 12212156... you will have to manually copy the tables that are different... there is no real shortcut if the OS id's are different.

[Hambone]

Yeah, they are totally different, gonna be a few hours. Good thing I enjoy this.

[Hambone]

Ok, got 12212156 to full-flash in, then was not able to put COS5 (02020005) in after that. keep getting

15:52:18.759: Unknown reply from boot loader: $FE.
15:52:18.775: PCM is in an unknown state.

Tried multiple times, of course, both with and without "Recover PCM" checked. No dice.

I have an idea how to do it now, and the process is failing me. What would cause this message? Luckily, my original OS went back in, seems to be just as it was, no problems.

Do I have the wrong COS?

[Hambone]

A side note, looking at the calibration page of 02020005, it says
This file is an EFILive Custom Operating System Upgrade.
It deliberately contains no calibration information.

This Custom Operating System is an EFILive development version. Please contact EFILive for more detials.

Upgrading your PCM with this Operating System requires a full PCM reflash,
which is only available in Commercial and Workshop versions.

Once the full reflash is complete, you must reflash the PCM with a
calibration that is compatible with the Custom OS, or the base GM OS from
which the Custom OS was derived.


But when looking at 02020003, it says

This file is an EFILive Custom Operating System Upgrade.
It deliberately contains no calibration information.

This Custom Operating System may be used to upgrade your PCM with these tuning options:
- Speed Density with dual spark maps and adaptive spark.
- Valet mode and/or "Two-Step" limiter.
- 2 and 3 bar, forced induction support.

Upgrading your PCM with this Operating System requires a full PCM reflash,
which is only available in Commercial and Workshop versions.

Once the full reflash is complete, you must reflash the PCM with a
calibration that is compatible with the Custom OS, or the base GM OS from
which the Custom OS was derived.

Do I have an older, pre-release version of 02020005? If someone has a version that's already populated, and with a 4L80E, that would be extremely helpful.