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Thread: New to COS5 setting up N2O

  1. #1
    Junior Member
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    Default New to COS5 setting up N2O

    I have just gone to COS5, and thanks to all the info on this site I had no problems getting it up and running. My question is this, why does my timing retard work with the switch, but VE modifier does nothing? I cannot find much info about this, do I have to be running SD? I have been over this thing 100 times today and any more info would be appreciated.

  2. #2
    Lifetime Member Doc's Avatar
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    Can you post up your tune and logs?

    2000 Silverado Full Size 4x4: Forged 6.2, H/C F1R Procharger
    98A4 Z28: 02 PCM H/C Forged 347, 9" Moser 3.73
    V1 V2 99+up RR COS #5 OLSD Dual Stg N20
    www.efialchemy.com
    www.greatamericancarwar.com

  3. #3
    Lifetime Member Beer99C5's Avatar
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    I have had the same problem was it resolved?
    1999 C5 A-4 Convertible
    1 of 245 Nassua Blue 99 Vert's, Blackwing, LS6 Intake, 42 # Injectors, Two Stage Nitrous System- Dry and a Wet Plate, EFI Live Scan/Tune V2, 1999 PCM with 2002 COS 5 OS Custom Nitrous Panel.


    Maine USA



  4. #4
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    mine seems to only work when i actually spray if not it hardly changes the afr. its weird i just tried it n/a and it did nothing but sprayed a 50 shot and went rich. i thought it worked without the n20 before the update but didnt seem to make a diffrence lately.

  5. #5
    Lifetime Member GMPX's Avatar
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    Are you absolutely sure the PCM is getting the trigger on it's pin when the NOS is not actually spraying?
    I no longer monitor the forum, please either post your question or create a support ticket.

  6. #6
    Lifetime Member Beer99C5's Avatar
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    Quote Originally Posted by GMPX View Post
    Are you absolutely sure the PCM is getting the trigger on it's pin when the NOS is not actually spraying?
    Mine is on a toggle, I have 3 degree's pulled in the COS part of the tune. when I activate the toggle I can see the 3 degrees pulled immediately (as it should).

    On the VE multiplier, I have set 1.1 to .9 for the value. This is to help it along at the lean side and then lean it out (the dry shot richens near the end). I have never seen this work. Eurospec1 says I should see the commanded AFR change when its active. I have not seen this happen when the toggle is on (but the timing pull works).

    I have a new tune I am trying today from Doug @ ECS maybe it will work.

    Worse case, maybe the tutorial or notes need to be a bit clearer on what values need to be in the COS 5 to enable the VE multiplier for Nitrous Monitor?
    1999 C5 A-4 Convertible
    1 of 245 Nassua Blue 99 Vert's, Blackwing, LS6 Intake, 42 # Injectors, Two Stage Nitrous System- Dry and a Wet Plate, EFI Live Scan/Tune V2, 1999 PCM with 2002 COS 5 OS Custom Nitrous Panel.


    Maine USA



  7. #7
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    i had to put 1.3xx just to get in the 11.7 range on 150 shot dry.

  8. #8
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    any updates on this?

  9. #9
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    I still had the Maf plugged in. oops. Figured it out later that day. The program works excellent now. My best now is 11.08 with the nitrous, now to just get a progressive controller and eliminate some of this wheelspin.

    FYI: I had great success with the VE modifier eliminating the lean spike going to a value of 1.2 in line with my window switch, and fine tuning my A/F after that. I am very satisfied with the addition of this.

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