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Thread: OLSD feels awesome.. issue down low.

  1. #21
    Lifetime Member SSpdDmon's Avatar
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    Well, hold up a second now. I never said put Desired Airflow back to stock. Doing that isn't going to solve any problems. But, it sure will create a bigger one...that car won't likely idle at all with the stock Desired Airflow table. I'd suggest you go back and carefully read what I have posted.

    Tuning isn't about just making a change because "someone told you so". You need to try to understand why you're making that change and better yet, make the change based on data. If you don't understand the why...you need to post up and ask.

    What I had originally suggested was that you return your throttle cracker thresholds back to stock (you had them set at ~10mph). The reason why I suggested this was because you said you had issues under 10mph when coasting to a stop. What I think is happening is, the airflow being provided by the cracker is turning off at 10mph. Between then and 2mph, nothing is being done to compensate for the change. Once you're below 2mph, the adaptive idle controls take over and smooth everything out. So by returning the TC thresholds back to stock, you restore the element of control that's missing. This will allow you to adjust the throttle cracker airflow values (based on MPH & RPM data) to stop the problem from occuring.

  2. #22
    Lifetime Member waterbug1999's Avatar
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    Yea, I think I will put the desired airflow where it was at and maybe add some around the temps the car normally sees (its only a summer car) and see if that helps on the cold start up surging..

    Ill return B4313 back to 0 and see if just adding a little air down low on B4309 alone will help. Going to leave B4311/B4312 at 10/9 and see how it works. Ill get back to ya and let you know how it worked out this weekend when I can get to the car. Thanks again.

    1999 Trans Am. 10.71 @ 126 - stock bottom end-

  3. #23
    Lifetime Member mr.prick's Avatar
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    How about logging RAFIG and adding it to {B4307}
    512k RoadRunner Firmware 12.14R
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  4. #24
    Lifetime Member waterbug1999's Avatar
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    I dont understand RAFIG. I barely understood what to do with the AutoVE mapping.

    1999 Trans Am. 10.71 @ 126 - stock bottom end-

  5. #25
    Lifetime Member hquick's Avatar
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    Here's a link to an excellent idle tuning guide SSPDMON put together.
    RAFIG/RAFPN are explained within.

    http://forum.efilive.com/showthread....ighlight=rafig
    Howard

    YOU ONLY NEED TWO TOOLS IN LIFE - WD-40 AND DUCT TAPE. IF IT DOESN'T
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    IF YOU CAN'T FIX IT WITH A HAMMER, YOU'VE GOT AN ELECTRICAL PROBLEM.


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  6. #26
    Lifetime Member SSpdDmon's Avatar
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    Quote Originally Posted by hquick View Post
    Here's a link to an excellent idle tuning guide SSPDMON put together.
    RAFIG/RAFPN are explained within.

    http://forum.efilive.com/showthread....ighlight=rafig
    Thanks...

    Also some here: http://forum.efilive.com/showthread....514#post100514
    and here: http://forum.efilive.com/showthread....609#post100609

  7. #27
    Lifetime Member waterbug1999's Avatar
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    well, I got the coming to a stop idle problem issue and it stays pretty smooth when I stop.. So, thats good.

    Cold start, not so good. It cranked over one time and then dies, next crank it started, this was with some changing of the "desired air flow".. So, since it didnt work I put it back to where it was.

    Any other suggestions to try for cold start issueS?

    1999 Trans Am. 10.71 @ 126 - stock bottom end-

  8. #28
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    I've found on the 3 cars I've done it's more with fuel then air. It can be overly rich or even lean. Lean it wont start well unless you give it gas, this doesnt start because of more air but because the MAP changes. If it starts and chugs even giving it gas it's too rich.

    How about posting your tune? AND the log when it died.
    Last edited by LS1_Dragster; August 8th, 2009 at 01:52 PM.

    230" Dragster - 2000 LS1, 02020003 Speed Density, PRC 2.5 Heads,
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    PowerGlide, 5000 stall converter. 8.70@154 MPH

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  9. #29
    Lifetime Member waterbug1999's Avatar
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    Quote Originally Posted by LS1_Dragster View Post
    I've found on the 3 cars I've done it's more with fuel then air. It can be overly rich or even lean. Lean it wont start well unless you give it gas, this doesnt start because of more air but because the MAP changes. If it starts and chugs even giving it gas it's too rich.

    How about posting your tune? AND the log when it died.
    I didnt log it.. Ill try it tomorrow.... I will say this, when the WB02 warms up and on a cold start, it reads lean till till it warms up. Just saying that because I would say im lean on cold start and not rich due to what the WB02 reads. Im just not sure what to change... Maybe take out some "desired air flow"?

    1999 Trans Am. 10.71 @ 126 - stock bottom end-

  10. #30
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    No, dont worry about the air yet, lets get you more fuel.

    What is your A0008

    And B3632

    Post your tune!

    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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