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Old 11-18-2010, 09:07 AM
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Tunes changing over time

My truck info and mods are in my sig, but the basics are this: 2003, 4" turbo back exhaust, no cat. SCT with SRL and Xtreme street.

My question is this: Right after installing a tune, the truck shifts great and has tons of power, however it seems as though over time the shifting changes and the power seems to lessen. However if I reload the tune again, it all goes back to how it was.

Do our trans. have the "learning" shift style? Where it adjusts shifts based on your driving habits over time? If so, is there any way to make the tunes stay how they were at the time of installation?

If they don't have this feature, any idea on what could be causing this? Besides it all being in my mind lol.



Thanks in advance
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Old 11-19-2010, 10:41 AM
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I've noticed this on my 03 6.0 Excursion. I thought I was imagining things, that it just seemed doggy and lazy, but after I reloaded the tune all was well.
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Old 11-19-2010, 10:48 AM
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I've noticed this too in my 7.3, I used to be able to burn the tires off when I spooled up in second, now I can just bark them. I haven't tried taking it off and the putting it back on, I change on the fly an it's the same

Used to have crisp hard throttle response, now it feels like it's stock
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Old 11-19-2010, 10:52 AM
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I had this same kinda feeling when I had the edge evo programer. I just thought it was in my head but maybe not??
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Old 11-19-2010, 11:01 AM
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haven't had tunes long enough but I want to know as well.
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Old 11-19-2010, 08:25 PM
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Mine seems the same way.
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Old 11-20-2010, 10:25 AM
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Yes, the tranny has an adaptive learning cycle it goes through. The most critical stage of this process is right after the ECU has been reflashed or the batterires have been disconnected.

The transmission must completely relearn and adjust line pressures.

The quickest way to get the tranny on its feet after a reflash is pretty simple.

After startup, while idling (foot on brake), shift from Park to Reverse, Reverse to Neutral, Neutral to Drive, letting the tranny fuly shift into gear each time. Then go from D to R, R to P, P to D. Repeat this a few times in different combinations. You truck will drop into gear more quickly and more positively each shift.

To the OP, what you're probably seeing is the tranny smoothing out the shifts after having a chance to adjust. It's probably not any slower, just smoother.
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Old 11-20-2010, 10:40 AM
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very interesting, thanks for the training on the tranny
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Old 11-20-2010, 01:53 PM
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Quote:
Originally Posted by wetnsloppy4x View Post
Yes, the tranny has an adaptive learning cycle it goes through. The most critical stage of this process is right after the ECU has been reflashed or the batterires have been disconnected.

The transmission must completely relearn and adjust line pressures.

The quickest way to get the tranny on its feet after a reflash is pretty simple.

After startup, while idling (foot on brake), shift from Park to Reverse, Reverse to Neutral, Neutral to Drive, letting the tranny fuly shift into gear each time. Then go from D to R, R to P, P to D. Repeat this a few times in different combinations. You truck will drop into gear more quickly and more positively each shift.

To the OP, what you're probably seeing is the tranny smoothing out the shifts after having a chance to adjust. It's probably not any slower, just smoother.
Thanks, I'll go pull the battery cable, reload the tune and give that a try.
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