Page 1 of 2 12 LastLast
Results 1 to 10 of 15

Thread: D5071 Full converter lockup?

  1. #1
    Senior Member DmaxHawk's Avatar
    Join Date
    Apr 2008
    Posts
    151

    Default D5071 Full converter lockup?

    On this table it displays the maximum duty cycle for the TCC. the max on the stock table is 65%, if i raise it too 100% will that completely lock up the torque converter as soon as i hit 2nd in t/h?
    07 El Bee Zee
    Little faster than stock...

  2. #2
    Lifetime Member Cougar281's Avatar
    Join Date
    Jan 2006
    Posts
    882

    Default

    If you set it to 100%, you'll burn out the TCC solenoid.

  3. #3
    Senior Member DmaxHawk's Avatar
    Join Date
    Apr 2008
    Posts
    151

    Default

    Even on a built transmission?
    07 El Bee Zee
    Little faster than stock...

  4. #4
    Lifetime Member Cougar281's Avatar
    Join Date
    Jan 2006
    Posts
    882

    Default

    Yep. TCC Solenoid has nothing to do with weather the trans is built or not; the solenoid isn't designed for 100% duty cycle and will burn out in relatively short order if you set it to 100%.

  5. #5
    Senior Member DmaxHawk's Avatar
    Join Date
    Apr 2008
    Posts
    151

    Default

    Why is it that with an ATS copilot the lockup feels stronger than just with t/h? is there a way to do this with efi? I would like to have it locked up 100% at partial throttle
    07 El Bee Zee
    Little faster than stock...

  6. #6
    Lifetime Member vortecfcar's Avatar
    Join Date
    Apr 2007
    Posts
    536

    Default

    You're confusing 100% lockup with 100% duty cycle on the solenoid. The two things are not necessarily the same. You can have full lockup (zero slip) at 50% solenoid command assuming appropriate engine torque.

    The solenoid runs off and algorithm that detects TCC slip and then adjust pulse width on the solenoid to get rid of the slip. It's modulated on a feedback loop this way to lessen the harshness of the TCC lock.

    If you want a firmer lockup, raise the minimum duty cycle tables, not the maximum.

    Nick

  7. #7
    Senior Member DmaxHawk's Avatar
    Join Date
    Apr 2008
    Posts
    151

    Default

    Quote Originally Posted by vortecfcar View Post
    You're confusing 100% lockup with 100% duty cycle on the solenoid. The two things are not necessarily the same. You can have full lockup (zero slip) at 50% solenoid command assuming appropriate engine torque.

    The solenoid runs off and algorithm that detects TCC slip and then adjust pulse width on the solenoid to get rid of the slip. It's modulated on a feedback loop this way to lessen the harshness of the TCC lock.

    If you want a firmer lockup, raise the minimum duty cycle tables, not the maximum.

    Nick
    Ohh I see. So how far should I raise it?
    07 El Bee Zee
    Little faster than stock...

  8. #8
    Junior Member
    Join Date
    Feb 2008
    Posts
    27

    Default

    that is up to you. just make small increases until you get it where you want it

  9. #9
    Senior Member DmaxHawk's Avatar
    Join Date
    Apr 2008
    Posts
    151

    Default

    What is the maximum I can go. Does it firm up the lockup in both regular and t/h?
    07 El Bee Zee
    Little faster than stock...

  10. #10
    Lifetime Member
    Join Date
    Jan 2007
    Posts
    387

    Default

    I was looking at my log tonight of a high powered tune on my stock trans. It seems like the toque converter is able to lock fine, but the duty cycle the TCM is commanding is making it slowly lock up.

    Everyone seems to say the Ramp on rate for the TCC dosent do anything. Ive tried and havent noticed any difference either. Everything just does wierd stuff. Its like it will up the DC then back off the DC then go to 98.6% and it will stay within 25rpms slip speed.

Page 1 of 2 12 LastLast

Similar Threads

  1. TCC lockup again
    By DURAtotheMAX in forum Allison 5 & 6 Speed
    Replies: 17
    Last Post: April 23rd, 2011, 01:21 AM
  2. ls1 to t700 converter lockup
    By killalux in forum Conversions / Aftermarket Parts
    Replies: 1
    Last Post: May 26th, 2010, 10:36 AM
  3. 4L80e converter lockup fix when letting off throttle?
    By chevyguy7802 in forum 4speed RWD/FWD Transmission Tuning (incl T42)
    Replies: 8
    Last Post: October 2nd, 2009, 05:26 AM
  4. TCC Lockup While Coasting
    By RonC in forum 4speed RWD/FWD Transmission Tuning (incl T42)
    Replies: 24
    Last Post: March 28th, 2007, 04:33 AM
  5. TC lockup question
    By driver456 in forum 4speed RWD/FWD Transmission Tuning (incl T42)
    Replies: 11
    Last Post: April 7th, 2006, 03:52 AM

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •