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Thread: upgrading from 99 to 2002 OS? really worth it?

  1. #1
    Member rumblebox's Avatar
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    Default upgrading from 99 to 2002 OS? really worth it?

    i've heard of a lot of people upgrading to the newer OS, but what benefits would i get from it? easier to tune? less tuning needed?

  2. #2
    Joe (Moderator) joecar's Avatar
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    Advantages:
    - single VE table (makes tuning a little easier),
    - a few extra tables,
    - some unlisted GM fixes/corrections,
    - available 4L80E transmission segment,
    - available COS5 (boost/nitrous/alpha-n tables),
    - some extra _DMA pids available (e.g. DYNAIRTMP_DMA).
    - available extra tables for transient fueling, lean cruise (via .cax file).

    Disadvantages:
    - you have to manually copy your old tables over to the new file, takes about 2 hours (3 with beer).
    Last edited by joecar; September 17th, 2012 at 07:46 AM. Reason: added one more advantage (cax)

  3. #3
    Member rumblebox's Avatar
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    i started copying everything over when i was planning to do a 4L80 swap a couple years ago, but i never upgraded after i axed the 4L80 swap. i guess now is the time to do it, since i haven't tuned a single thing since i did the top end and cam swap.

  4. #4
    Joe (Moderator) joecar's Avatar
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    When you copy the tables, do copy-with-labels from the old file, do paste-with-labels into the new file...

    the "with-labels" causes the pasted table to align up with the values on the axises.

  5. #5
    Joe (Moderator) joecar's Avatar
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    Some people just tune with the older OSes, it really isn't that much more work...

    but some people like the conveniences/advantages I mentioned above.

  6. #6
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    I found it useful as the step to a COS. The custom operating systems have so much more options and make tuning nicer for a head/cam setup running in OLSD only, it also has the option of dual spark timing (high and low octane tables when running OL) and also the noz, boost etc etc modes as joecar mentioned. I'm sure I have a migrated LS1 99 tune to 02 tune somewhere if you want it. All stock BTW, then I just changed the tune and flashed in mine. If you've not changed anything yet since your build it would e a good start ?

  7. #7
    Joe (Moderator) joecar's Avatar
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    Yes, the COS's retain HO/LO adaptive spark timing when running SD

    (running MAF-less causes and requires a MAF DTC (which on the OEM OS's causes failover to LO timing].

  8. #8
    Member rumblebox's Avatar
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    is there a way to only use a wideband without leaving CL once at OT?
    | 2000 firebird | LQ4 | LS3 top end | 226/231 .600 .602 114 | TCI 3500 | 3" x-pipe under-axle | BMR everything |

  9. #9
    Joe (Moderator) joecar's Avatar
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    Quote Originally Posted by rumblebox View Post
    is there a way to only use a wideband without leaving CL once at OT?
    When in CL, the wideband wlll report stoich (lambda = 1) since the PCM is trimming to stoich)...

    i.e. the wideband won't show the deviation from commanded lambda, but the trims will.

  10. #10
    Member rumblebox's Avatar
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    i kindof understand. so you can only use the wideband for tuning purposes, not every day driving purposes?
    | 2000 firebird | LQ4 | LS3 top end | 226/231 .600 .602 114 | TCI 3500 | 3" x-pipe under-axle | BMR everything |

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