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Thread: Cold AFR doesn't follow commanded AFR

  1. #11
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    May 2008
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    Thanks for the replies.

    The color is House of Kolor Kandy Majestic Blue over platinum silver base. I will paint stripes on it this winter, I just havent had the time to complete it. Here are a few pictures from the autorama:




    230" Dragster - 2000 LS1, 02020003 Speed Density, PRC 2.5 Heads,
    MS3 Cam 237/242 .603/.609, Vic Jr. intake, Holley 1000CFM TB,
    PowerGlide, 5000 stall converter. 8.70@154 MPH

    My Projects Homepage: http://www.horsepowerracing.com

  2. #12
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    Quote Originally Posted by SOMhaveit View Post
    Desired Air Flow numbers appear to be on the low side and idle spark is 36 degrees.

    You have all of the spark tables with high spark values around idle and then have lowered optimal spark values compared to oem values around idle.

    Aside from that, your actual AFR compared to commanded ain't all that bad.
    Air flow may be low because I have an edelbrock vic jr and Holley throttle body. Since these are not stock I had to work the program around them.

    I have found with the other cars I've done with larger cams it loves a lot of timing around idle, it tames them a lot and "takes the cam out" so to speak. If I understand the CO3 correctly when I set A0000 To enable and A0001 to 100% it will only use the high octane timing map.

    Commanded AFR is getting better as far as driving goes, I've only put on a few miles since the rebuild. I was just concerned as to why cold AFR is not achievable.

    Lee

    230" Dragster - 2000 LS1, 02020003 Speed Density, PRC 2.5 Heads,
    MS3 Cam 237/242 .603/.609, Vic Jr. intake, Holley 1000CFM TB,
    PowerGlide, 5000 stall converter. 8.70@154 MPH

    My Projects Homepage: http://www.horsepowerracing.com

  3. #13

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    Look at table A0008 - When using {B3647} "Commanded Fuel vs RPM (Normal)" to define the commanded fuel, this table is used as multiplier based on engine coolant temperature.A number of 1.00 will add no more fuel based on the engine coolant temp, any number higher than that will add fuel.

    Also have a dip in IFR b4001.

    Are you running ls1 - 346ci ? your vin number indicates a gm light chevy truck and your {B0104} Cylinder Volume is 957.

  4. #14
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    A0008 is what I use for the cold start fuel enhancement, the larger the numbers the lower the AFR goes but it doesnt show the same drop in actual AFR.

    I do have a dip, never noticed. I just cut and pasted from the IFR spreadsheet program thats floating around on this site.

    No, the engine is a 98 454 L-29 and 4L80E trans, I just changed everything to make it work. I wish I could edit those fields so I could put in what the engine/year etc really is. In fact if I change the VIN to the firebird's I loose the PID's.

    230" Dragster - 2000 LS1, 02020003 Speed Density, PRC 2.5 Heads,
    MS3 Cam 237/242 .603/.609, Vic Jr. intake, Holley 1000CFM TB,
    PowerGlide, 5000 stall converter. 8.70@154 MPH

    My Projects Homepage: http://www.horsepowerracing.com

  5. #15

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    remember the afr command table in COS3 is no longer temp v map but rpm v map. As such you need to adjust a0008 so you are not running lean or too rich at cold start up. Also idle speed at different temps have an effect.

    Beautiful looking car

  6. #16
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    Quote Originally Posted by LS1_Dragster View Post
    It looks like there's a real need for a true speed density OS, one that is scaled down without all the useless tables, kinda like the Holley commander software!!
    I don't see why? COS5 works like this.

    I've had this issue with my stock z06 and my guess there is another multiplier that we do not have access too.

    What i did was command a richer afr and be done with it.
    "All that is needed for the triumph of evil is that good men do nothing..."

  7. #17
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    Quote Originally Posted by LS1_Dragster View Post
    Air flow may be low because I have an edelbrock vic jr and Holley throttle body. Since these are not stock I had to work the program around them.

    I have found with the other cars I've done with larger cams it loves a lot of timing around idle, it tames them a lot and "takes the cam out" so to speak. If I understand the CO3 correctly when I set A0000 To enable and A0001 to 100% it will only use the high octane timing map.

    Commanded AFR is getting better as far as driving goes, I've only put on a few miles since the rebuild. I was just concerned as to why cold AFR is not achievable.

    Lee
    is your throttle body an ETC TB?
    "All that is needed for the triumph of evil is that good men do nothing..."

  8. #18
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    The Holley just has a couple of tables and is real easy to work with, none of this table modifies this table and BTW there are 3 other tables that effect the first table....etc.!!

    I'm not sure what an ETC TB is so here's a picture of what I have:


    230" Dragster - 2000 LS1, 02020003 Speed Density, PRC 2.5 Heads,
    MS3 Cam 237/242 .603/.609, Vic Jr. intake, Holley 1000CFM TB,
    PowerGlide, 5000 stall converter. 8.70@154 MPH

    My Projects Homepage: http://www.horsepowerracing.com

  9. #19

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    Electronic Throttle Control (ETC), your tb is cable driven.

  10. #20
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    May 2008
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    I should of known, but it just didnt click!

    230" Dragster - 2000 LS1, 02020003 Speed Density, PRC 2.5 Heads,
    MS3 Cam 237/242 .603/.609, Vic Jr. intake, Holley 1000CFM TB,
    PowerGlide, 5000 stall converter. 8.70@154 MPH

    My Projects Homepage: http://www.horsepowerracing.com

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