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Forum: Custom Operating Systems

Speed Density, Valet Mode, 2-Step, alpha-N. No Diesel DSP

  1. OS upgrade... from 12593555

    Started by wayneosan, March 22nd, 2010
    5 Pages •
    1 2 3 ... 5
    4 Attachment(s)
    • Replies: 44
    • Views: 20,637
    wayneosan
    March 24th, 2010 Go to last post

  2. how to update the VE map to cutom 2-3 bar table

    Started by MadBeaver, April 30th, 2017
    4 Pages •
    1 2 3 ... 4
    custom os 2-3 bar 4 Attachment(s)
    • Replies: 38
    • Views: 19,650
    joecar
    July 5th, 2017 Go to last post

  3. cos3 semi closed loop

    Started by kostelacd69, April 21st, 2009
    4 Pages •
    1 2 3 ... 4
    3 Attachment(s)
    • Replies: 35
    • Views: 19,460
    kostelacd69
    September 11th, 2009 Go to last post

  4. Car is running VERY rich all of a sudden

    Started by alwaysinboost, May 20th, 2009
    4 Pages •
    1 2 3 ... 4
    3 Attachment(s)
    • Replies: 39
    • Views: 18,713
    alwaysinboost
    June 8th, 2009 Go to last post

  5. Upgrading to COS E40 ECM

    Started by sonicgroove, December 4th, 2018
    • Replies: 8
    • Views: 18,490
    ScarabEpic22
    December 12th, 2018 Go to last post

  6. gm os to custom os

    Started by 69camaro5speed, January 19th, 2006
    3 Pages •
    1 2 3
    6 Attachment(s)
    • Replies: 25
    • Views: 18,442
    1SlowHoe
    July 15th, 2007 Go to last post

  7. RePost

    Started by MN C5, December 11th, 2005
    3 Pages •
    1 2 3
    1 Attachment(s)
    • Replies: 25
    • Views: 18,386
    Blacky
    December 17th, 2005 Go to last post

  8. Do I have to have a commercial license to upgrade OS?

    Started by Diarrheabetes, May 6th, 2018
    2 Pages •
    1 2
    • Replies: 19
    • Views: 18,046
    ScarabEpic22
    August 15th, 2018 Go to last post

  9. Tuning a 8TB manifold 383 with big cam

    Started by oztracktuning, July 28th, 2006
    4 Pages •
    1 2 3 ... 4
    • Replies: 32
    • Views: 17,728
    TNT76
    September 19th, 2006 Go to last post

  10. Exclamation Cold Start Enrichment in pre-2003 COS

    Started by Alex99, October 2nd, 2008
    4 Pages •
    1 2 3 ... 4
    2 Attachment(s)
    • Replies: 38
    • Views: 17,127
    hquick
    May 19th, 2009 Go to last post

  11. Since GM tuning is ending...

    Started by LSxPwrdZ, January 24th, 2019
    2 Pages •
    1 2
    • Replies: 18
    • Views: 17,079
    ToonerSQUAD89
    January 26th, 2020 Go to last post

  12. 2 step

    Started by minytrker, June 29th, 2007
    • Replies: 2
    • Views: 16,868
    onfire
    July 16th, 2007 Go to last post

  13. Exclamation Custom O.S #3 Update for 2003+

    Started by GMPX, January 10th, 2007
    2 Pages •
    1 2
    • Replies: 16
    • Views: 16,833
    Alex99
    September 29th, 2008 Go to last post

  14. cos 5 timing going to 0 at high rpms

    Started by 69camaro5speed, September 18th, 2011
    3 Pages •
    1 2 3
    4 Attachment(s)
    • Replies: 26
    • Views: 16,478
    69camaro5speed
    June 24th, 2012 Go to last post

  15. where do I download COS#5

    Started by squealingtires, July 4th, 2007
    • Replies: 6
    • Views: 16,416
    joecar
    July 19th, 2007 Go to last post

  16. 2005 Silverado Installing ethanol content sensor

    Started by Andyb756, October 3rd, 2018
    2 Pages •
    1 2
    • Replies: 16
    • Views: 16,389
    Andyb756
    October 29th, 2018 Go to last post

  17. LS1B 1bar SD COS

    Started by hrspwr, October 7th, 2020
    3 Pages •
    1 2 3
    3 Attachment(s)
    • Replies: 23
    • Views: 16,351
    joecar
    December 26th, 2020 Go to last post

  18. Jenvey ITBs - COS 5 on an LS1

    Started by bimbleuk, January 15th, 2014
    2 Pages •
    1 2
    • Replies: 19
    • Views: 15,544
    bimbleuk
    June 4th, 2014 Go to last post

  19. Poll Poll: Flex Fuel for LS1

    Started by mr.prick, September 23rd, 2009
    2 Pages •
    1 2
    • Replies: 15
    • Views: 15,319
    Tre-Cool
    July 6th, 2014 Go to last post

  20. Why not use MAF for entire RPM range?

    Started by LS1_Dragster, August 27th, 2010
    3 Pages •
    1 2 3
    • Replies: 24
    • Views: 15,184
    DrX
    July 7th, 2011 Go to last post
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