How long until OAR registers new fuel mix

Discussion in 'Generation 4 - Performance Upgrades' started by STAN SCHWARTZ, Jun 5, 2020.

  1. STAN SCHWARTZ

    STAN SCHWARTZ SHO Member

    Joined:
    Jul 26, 2018
    Messages:
    244
    Likes Received:
    165
    Gender:
    Male
    Location:
    St. Louis, MO
    So I mixed a weak tank of fuel which gave me an OAR of -.59. I corrected it and drove about 5 miles....but it still read -.59.

    How long does it take for the system to recognize the new mix?

    As always, thanks in advance.
    S

    Sent from my Pixel 4 XL using Tapatalk
     
  2. luigisho

    luigisho SHO Member

    Joined:
    Nov 2, 2001
    Messages:
    9,959
    Likes Received:
    2,801
    Location:
    va beach,va
    Home Page:
  3. stripSHO

    stripSHO Dog Trainer

    Joined:
    Sep 9, 2019
    Messages:
    237
    Likes Received:
    195
    Gender:
    Male
    Location:
    Detroit
    It depends on your driving and Matt's settings in the tune. Fastest way to do it that I've found is to do some 4th or 5th gear moderate acceleration pulls from a low dig (not too hard, not too soft, not too much RPM). Watch your knock sensor - you need to get it to at least -3 or -4 and hold it there for a few seconds, then let off. OAR will update then. Lather, rinse, repeat!

    These are the stock conditions required for knock learning. They may be different in your tune:

    K.R. <= -3 for at least 6.5s
    0.40 <= Load <= 1.50
    1,200 <= RPM <= 4000
    170 <= Coolant Temp <= 230
     
  4. STAN SCHWARTZ

    STAN SCHWARTZ SHO Member

    Joined:
    Jul 26, 2018
    Messages:
    244
    Likes Received:
    165
    Gender:
    Male
    Location:
    St. Louis, MO
  5. ridered74

    ridered74 SHO Member

    Joined:
    Mar 27, 2015
    Messages:
    675
    Likes Received:
    805
    Gender:
    Male
    What he said....as for the gas reaching your fuel rail, when I fill up it usually takes 5-10 minutes of driving before my ethanol sensor settles on a final number, so I would say drive it for about 10 minutes or so and then do the technique stripsho mentions above.
     
    STAN SCHWARTZ likes this.
  6. luigisho

    luigisho SHO Member

    Joined:
    Nov 2, 2001
    Messages:
    9,959
    Likes Received:
    2,801
    Location:
    va beach,va
    Home Page:
    I don't have any reason to doubt either of the other replies. I would also ask Matt if he knows what the parameters are for this car to move between tables based on octane and knock detection.
     
    STAN SCHWARTZ likes this.
  7. STAN SCHWARTZ

    STAN SCHWARTZ SHO Member

    Joined:
    Jul 26, 2018
    Messages:
    244
    Likes Received:
    165
    Gender:
    Male
    Location:
    St. Louis, MO
    Ok 100 miles of driving didn't make a difference. Then I remembered something mentioned about watching the knock retard.

    So....I put it in 6 and got to just under 50 in sport mode and pushed the gas to about 75%. Only built about 10 or 20 mph, but it went from -.59 to -.61!

    That's movement! So...rinse, repeat got it up to....er down to, -.79. One or two more runs like that got it to -.96.

    At one point I glanced at the knock retard and saw -4.00! Sa-weet!

    Thanks everyone!

    Sent from my Pixel 4 XL using Tapatalk
     
    luigisho, stripSHO and SM105K like this.
  8. SM105K

    SM105K Streetlight Grand Prix Champ/ IG @egocheckersho

    Joined:
    May 3, 2018
    Messages:
    4,063
    Likes Received:
    4,317
    Gender:
    Male
    Occupation:
    Paper Slayer
    Location:
    Arizona
    Did that same thing with my Focus today.
     
  9. mattr66

    mattr66 SHO Member

    Joined:
    Sep 3, 2015
    Messages:
    233
    Likes Received:
    474
    2 or more seconds -3 or more negative KR gets you an oar update when running gearhead.

    Sent from my Moto Z (2) using Tapatalk
     
  10. 802SHO

    802SHO FULL SEND

    Joined:
    Oct 8, 2019
    Messages:
    564
    Likes Received:
    824
    Gender:
    Male
    Location:
    Essex Junction Vermont
    With my a couple gallons 93 pump gas sitting in my tank for 7 months with no Stabil in it...I mixed in 2.5 gallons of 110 octane. First ride and datalog. OAR -96. Quick and easy.
     
    SM105K and STAN SCHWARTZ like this.

Share This Page

If you wish to help keep SHOforum running, please click the donation button below