launch timing retard method

Discussion in 'PSI Superchargers Tech Questions' started by rickey, Aug 19, 2019.

  1. rickey

    rickey Member

    Joined:
    Dec 7, 2004
    Messages:
    262
    Likes Received:
    1
    I have ask 4 different people and got four different ways on timing retard at launch.
    does it really matter when you retard it?

    as soon as transbreak button pressed
    as soon as transbreak button is released
    1/2 when TB button is pressed and 1/2 when TB button released
    When you go wide open throttle

    does it really matter when you retard it?
     
    #1
    rickey, Aug 19, 2019
    Bob sherry likes this.
  2. nitrowannabe

    nitrowannabe Member

    Joined:
    Oct 9, 2006
    Messages:
    414
    Likes Received:
    20
    Describe your car to the experts here. I probably need to know the answer also.
     
    #2
    nitrowannabe, Aug 19, 2019
  3. rb0804

    rb0804 Active Member

    Joined:
    Aug 7, 2010
    Messages:
    671
    Likes Received:
    38

    Depends on what you have and what your trying to accomplish. If you have a converter drive with a planetary type transmission behind it, it’s probably a good idea to pull timing while on the brake. It helps it idle down to help ease it in and out of gear. The only issue that I have with that is it makes doesn’t come up on the brake clean that way and may stumble at times, again depending on what you have.

    Other than that, it depends on what your tire is doing how and when you drop out timing, if any at all.
     
    #3
    rb0804, Aug 19, 2019
  4. Will Hanna

    Will Hanna We put the 'inside' in Top Alcohol
    Staff Member

    Joined:
    May 6, 2003
    Messages:
    6,706
    Likes Received:
    133
    All depends on how hard you want to hit and drive the tire at the hit.

    Don't forget about launch rpm, tire pressure and other factors
     
    #4
    Will Hanna, Aug 20, 2019
  5. Bob Alberty Jr.

    Bob Alberty Jr. Member

    Joined:
    Jun 7, 2003
    Messages:
    182
    Likes Received:
    5
    My way was as soon after the release of the brake as possible. I didn't care for backing up from the peelie with reduced timing. (Pro brake)
    Header flames, officials giving me the stink eye, and it just sounded like poop the whole time I was backing up, plus whatever duration was programmed at that time.
    Without looking at my grid, say it was dropping timing at .01 after the brake release, pull amount of timing you desire for whatever duration you desire.
     
    #5
    Bob Alberty Jr., Aug 20, 2019
  6. comp altered 632

    comp altered 632 New Member

    Joined:
    Jan 8, 2016
    Messages:
    20
    Likes Received:
    2
    If you got grid then launch retard is timed from launch input.
     
    #6
    comp altered 632, Sep 14, 2019
  7. Mike Canter

    Mike Canter Top Dragster
    Staff Member

    Joined:
    Mar 10, 2004
    Messages:
    4,630
    Likes Received:
    189
    On the Grid when using Launch Retard it depends on where you place the first dot on the graph. If it is right on the zero seconds then retard comes on when the trans brake button is depressed while staging. If you put the first dot not on the zero seconds then retard starts when the button is released plus and time before the first dot.
     
    #7
    Mike Canter, Sep 14, 2019
  8. td3829mk

    td3829mk Member

    Joined:
    Dec 31, 2015
    Messages:
    180
    Likes Received:
    19
    I have tried both retarding at idle as well as starting the sequence after TB release. I found that retarding at idle created A LOT more head temp and made the car harder to tune at the hit. I may pull a degree or two out from total at idle if I have to but that's about it.

    Whether you start the retard sequence at .01 or .10 after TB release, have tried both, both work well depending on track condition.
     
    #8
    td3829mk, Sep 16, 2019
    rickey likes this.

Share This Page





XenPorta 2 PRO © Jason Axelrod from 8WAYRUN.COM