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Thread: Still won't shift @ WOT without hitting the rev limiter

  1. #1

    Still won't shift @ WOT without hitting the rev limiter

    I have my part throttle 100% tps MPH matched to all of the full throttle MPH speeds. Which are well below the actual speed that I am traveling when I hit the desired shift point. No I am at a 5500rpm full throttle shift point, but the car doesn't care. It still will not shift until it has hit the rev limiter a time or three. Once the electronic throttle closes a time or two, it'll shift. I am running the everloving piss out of this poor car lately, trying different things to get it to shift. I wanted to go to TnT tonight, but it looks like that plan is out the window. Any ideas here?
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  2. #2
    Potential Tuner
    Join Date
    Jul 2016
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    when searching in the trans section for the same problem , i ran across a thread where a guy suggested to set the mph to 0 and set the rpm to what i wanted it to shift at . i tried it and it worked perfect . i think i had to set mine a couple hundred rpm lower than where i wanted it to shift because of the time it takes to shift . i know this is probably not the correct way to do it , but was the only way i could make it shift . be sure to make the performance and hot tables the same if you have them . mine is a gen 3 5.3 with cable throttle body . dont know if electric throttle body will work different or not but its worth a try .

  3. #3
    If I keep lowering the shift mph, I'm going to end up at "0" anyway, so I might as well jump to there and see what happens.

  4. #4
    Potential Tuner
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    just do the up shift at 0 and also on the part throttle shift table make the 100 % tps row the same as full throttle shit speed table .
    Last edited by 5.3 s10; 04-28-2017 at 12:33 PM.

  5. #5
    Tried it. It was a little better, but instead of hitting the rev limiter 2-3 times, then shifting, it hit it once and shifted.

  6. #6
    ...
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  7. #7
    Potential Tuner
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    well hell , it works perfect on mine , only thing diff between the way yours is set up from mine is the 3-4 shift . mine is at 0 to . dont know if that would make a difference or not . i have torque management completely disabled on trans and engine side . dont know if that makes a difference or not . here is a copy of my tune , you can take a look and see if it will help .
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  8. #8

  9. #9
    Have you in fact swapped from the stop 3.08 gearing to 3.73?

    If so, give this a shot.
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    Last edited by 10SecSleeper; 04-30-2017 at 12:54 PM.
    Persistence is the key to success

  10. #10
    Yessir, I have. It didn't want the shift either before or after. I'll check that out.

  11. #11
    When logging, you can log the commanded gear. That will tell the rest of the story. With you saying it had the issue before gear swap. Chances are it's commanding the shift but the transmission is in need of a rebuild.
    Persistence is the key to success

  12. #12
    Senior Tuner mbray01's Avatar
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    Dec 2013
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    this was going to be my point, if its commanding the shift but not getting the shift, nothing in the cal will fix it, you are going to have open the trans
    Michael Bray
    Rusty Knuckle Garage
    Slidell, Louisiana
    20yr Master Tech.
    Advanced Level Specialist
    Custom Car Fabrication, Customization, High Performance.
    GM World Class Technician
    Shop Owner

  13. #13
    Maybe this is enough info to give you an idea of whether or not it's being commanded. Shift points are at 4500...still hitting 6500 rev limit.
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  14. #14
    Specifically log commanded gear next to current gear. Only see this happen when someone has wrong tire size or wrong gear inputted. An lastly transmission needing rebuilt.
    Persistence is the key to success

  15. #15
    I clearly don't know what I'm doing. 😂 Bear with me.

  16. #16
    I can't seem to find a parameter for commanded gear anywhere in the scanner.

  17. #17
    Here is a pull that I just did. Would that weird TPS drop, and linger around 38% have anything to do with it not shifting?
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  18. #18
    Tuner Monty's Avatar
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    Apr 2012
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    Hi yes, If that 60e doesn't have a nice shift kit or been built for track use, id go back to the stock trans settings & KEEP the TM/TR and even add a bit more Torque Reduction to it, else that 60e will need a rebuild in no time.. if it doesn't already, you might be able to save it though .. Always good practice to go back stock and start over when your having problems..

    Do not know how firm the shifts are, but chances are, if they are slipping, then the trans will need rebuilt, though if the slippage isnt that bad, then make sure to add more TM/TR into it and also set the ETC to back off just at the shifts will keep that trans alive for a long while.. (CUT OFF RPM vs Gear.. ETC RPM LIMIT vs Gear)

    I do not know anything about your set up, & im only telling you this to help to my best ability, if its a stock 60e you need to go back to stock settings and set the (ETC accordingly) & bump the Shift Pressure up as high as it will go like 96, and add some pressure modifiers, also your shift time should be cut down a 100 maybe 200 if your at 300 at lest for 1-2 shift, (i closed your tune cant see it as im typing..)

    You can then set the WOT shift RPM where you want it to shift, make sure the (ETC is set accordingly) and the (fuel cut off) is set past any rpm you might go to at lest 2 or 300 over, You want the (ETC) to back off at the exact same time the trans shifts.. Oh also not sure if your using tow-haul/performance, so below in my tune, the normal is stock and the T-H/P is the modded..

    Also might i add, the Full Throttle Shift Speeds is what i use for downs shifts only, so set those accordingly, the up shift can be 0 if need be, your going to be relying on RPM for shifts, Note if your tach sig is not correct or the pluses is off or the VSS is off malfunctioning also see http://www.twincharlotte.com/transmi...r-Charlotte-NC #2 and or #3 as this could cause your problem too.. Also see http://www.twintransmissionrepair.co...smission-shop/ Though im hope its just just something in your tune..

    Here take a look at my tune.. though its for a 80e, mine was slipping do to years of towing pipe out in the oil field, but i had the shifts at 6700rpm and that would cause it to hold gear and then once shifted it would hit right in the power band of the cam and cause tons of slipping.. though iv changed the shift rpm over the years the TM and TR is still set the same... This truck shifts fast and hard.. see videos link below..

    But i set it like it is in this tune file like 7 years ago and the trans is still alive and going WOT daily.. Im writing this just in case.. again i do not know nething about your setup.. just couldn't let this go by with out saying something in hopes to save your trans.. peace Edit: FILE IS UNLOCKED NOW lol :End Edit
    Last edited by Monty; 05-06-2017 at 05:47 PM.

  19. #19
    Tuner in Training
    Join Date
    Dec 2010
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    NJ
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    Your problem appears to be in your tune. You should go back to your initial settings that you first posted. The trans is confused due to the shift points. Reduce your 2-1 and 3-2 shift points to a speed lower then your up shift. your trans should then shift as you are commanding it in the rpm or speed table whichever is greater.

  20. #20
    Tuner in Training
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    Dec 2010
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    NJ
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    I just noticed 10secsleeper provided you with a good trans calibration. Flash that in and you should be fine. Each log you posted contained a bad trans calibration that would cause the trans to not shift. If you flashed 10secsleeper's calibration and continued to have the problem then as he and the other posters stated, you may have a hardware problem. bad trans