Results 1 to 13 of 13

Thread: Idle Timing

  1. #1

    Idle Timing

    would anyone be willing to help solve my idle timing issue, it was going negative 10. we now have it where it only goes to 0-4 degrees. I will attach a short drive and idle. I have spent a lot of money on 3 different tuners. the last/current tuner has made progress but I feel it can be resolved quickly with someone that has seen this problem before. if someone could tell me what needs adjusting or can do it, I will load the tune here so you can take a look. This is a heads and cam car. 2018 Camaro 1LE
    Attached Files Attached Files
    Last edited by jerrykeithwarren; 02-06-2019 at 12:53 AM.

  2. #2
    Senior Tuner
    Join Date
    May 2003
    Location
    South FL
    Posts
    1,359
    Have you tried lowering the Virtual Torque tables in the idle area? Also, have you messed with the idle torque settings? They work similarly to how the old Gen 3 Airflow tables worked but now since it is torque based you need to adjust this area as well. You need to post your stock and modified tune.
    [email protected]
    Owner/GM Calibrator
    Gen V Specialist - C7 Corvette, Gen6 Camaro & CTS-V3

  3. #3
    Senior Tuner Higgs Boson's Avatar
    Join Date
    Mar 2010
    Location
    Texas Hill Country
    Posts
    3,299
    External Load table "models zero pedal torque"

    log zero pedal torque into the external load table

  4. #4
    I thought zero pedal was logged in the file I posted.

  5. #5
    Please have a look at the stock and modified tune. I am not a tuner so I don't know how to adjust these tables.
    Attached Files Attached Files

  6. #6
    Senior Tuner Higgs Boson's Avatar
    Join Date
    Mar 2010
    Location
    Texas Hill Country
    Posts
    3,299
    Quote Originally Posted by jerrykeithwarren View Post
    I thought zero pedal was logged in the file I posted.
    It might be, I don't usually use my tuning laptop except for tuning.....

    but if your external load table is stock at say 130 ft lbs and your cam car idles at 40 then it's not going to idle right if you know what I'm sayin.

  7. #7
    So let’s say it’s idling at 40ft lbs and it’s set at 130 do you decrease the load table to 40 or what do you do?

  8. #8
    Senior Tuner Higgs Boson's Avatar
    Join Date
    Mar 2010
    Location
    Texas Hill Country
    Posts
    3,299
    Quote Originally Posted by jerrykeithwarren View Post
    So let’s say it’s idling at 40ft lbs and it’s set at 130 do you decrease the load table to 40 or what do you do?
    log zero pedal torque into the external load table then fine tune it with your best judgement.

  9. #9
    Senior Tuner
    Join Date
    May 2003
    Location
    South FL
    Posts
    1,359
    Quote Originally Posted by jerrykeithwarren View Post
    So let’s say it’s idling at 40ft lbs and it’s set at 130 do you decrease the load table to 40 or what do you do?
    https://forum.hptuners.com/showthrea...g-timing-to-10


    This thread may help you.
    [email protected]
    Owner/GM Calibrator
    Gen V Specialist - C7 Corvette, Gen6 Camaro & CTS-V3

  10. #10
    Lean out your maf curve around the idle by 10 percent. This is how I do it

  11. #11
    Quote Originally Posted by Higgs Boson View Post
    log zero pedal torque into the external load table then fine tune it with your best judgement.
    Thanks for this tip!

  12. #12
    Senior Tuner Higgs Boson's Avatar
    Join Date
    Mar 2010
    Location
    Texas Hill Country
    Posts
    3,299
    reducing your airflow models will tell the ecm you are making less torque and lean out your mixture, that's called a bandaid with negative side effects.

    correcting your torque model allows you to run the mixture and timing you desire.

  13. #13
    1LE's are different. They idle with less timing than SS's. You can take a stock 1LE and a stock SS same year, both with the same exact tunes and the 1LE will idle 0-2 degrees, and the SS 10-12 degrees. A good example of how we are not seeing all the tables. To get my 1LE to idle around 10 degrees I had to pull the torque down 150ft/lb in the -10 airmass and map table, 550 rpm, 0 cells. Then a gradient up through the -10, 0, and 10 tables to 15ft/lb out of the 10 degree table at 950 rpm, 300 airmass and 40 kpa map cells.