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I made a recent observation that was in error, and I wanted to set the record straight: Stinky (with his stage 2 sticks and a HD4R100 transmission) would slip badly at WOT on the last shift (I thought). Letting off the throttle and diving back in would clear the problem, but I was told I was "powering through" the 4 shift - and that's what I thought was happening as well.
The diagnosis was completely and utterly wrong. While diving deep into another issue, and in the interest of learning, I had AE running on every transmission PID I could find. I learned a few things, but the "AHA!" moment came when I did a high-power acceleration at highway speeds: My DD tune that has soft shifts programmed into it has the TCLU a little too soft for hammer-down.
To be clear: It's my own damn fault - I wanted squishy daily shifts when empty, and my tuning guy delivered the goods. I then went-a-wailin' with WOT and the tune needs to be tweaked to tell the TC to telegraph the torque to the tire tread in a quicker fashion. During a brief test drive, we both thought we were dealing with the 4 shift - and being on vacation and uninterested with digging in, we jumped to a conclusion. I've always said I'm a cautionary tale.
What to take from this post:
Don't believe everything you read on the forums, not even from a trusted source (we're all human - and even a typo can create disinformation). Validate everything, when possible.
Troubleshooting is paramount - assumptions are pricey.
I can admit when I make a mistake - and I do so as soon as I discover it, so as not to be misleading to the brotherhood. Please partake in this practice.
I now hold that the HD4R100 is up to the task with power-ups, but I gave it a bad rap for a few posts when I jumped to a conclusion.
This has been a public service announcement from the Stink-N-Rich research and development team.
Tow tune doesn't have the squishy TCLU, so the behavior is completely different. After I discovered my blunder... I conducted more driving tests with the DD tune. I see how the slow TC lock signal is there all the time, but I never realized it. I just knew my shifts (when empty in DD) are Cadillac smooth.
I haven't had the tune adjusted for WOT running yet - I rarely do WOT slams, so it took a long time to discover this.
By the way, my race tune doesn't have this problem either - but I've only used it twice.
I had Cody program some defueling in during the shifts in my tow program. You can feel it, and if you didn't know what was programmed, you'd swear something bad was going on.
I had Cody program some defueling in during the shifts in my tow program. You can feel it, and if you didn't know what was programmed, you'd swear something bad was going on.
That's a pretty good idea, I think the Dmax guys do that to save the trans.
You're thought process is logical and plausible, but without verification or validation your assumption is merely jumping to another premature conclusion. I do hope you can sort it out though, I hate seeing someone constantly chasing their tail.
My truck has always had a crappy 3-4 shift in my "economy" tune which I am in 95% of the time. It will flare under medium to heavy throttle. I hunkered down over a bunch of data and graphs and decided the TQ was being locked to slowly. The tuner claims the issue is in the trans. I have since installed the full tugger kit with the 3-4 shift as firmed up as I am comfortable taking it and a 6.0 converter, but it still does it and I am pretty convinced it is in the tuning.
I did a hard run (which I hate doing nowadays) and watched the data as I felt the familiar slip. I know for a fact that TC command can be tuned for a harsher shift - some tuners have difficulty backing off the harsh shifts.
My truck has always had a crappy 3-4 shift in my "economy" tune which I am in 95% of the time. It will flare under medium to heavy throttle. I hunkered down over a bunch of data and graphs and decided the TQ was being locked to slowly. The tuner claims the issue is in the trans. I have since installed the full tugger kit with the 3-4 shift as firmed up as I am comfortable taking it and a 6.0 converter, but it still does it and I am pretty convinced it is in the tuning.
I think it can be fixed with tuning. My new tuner is leaps and bounds ahead of my older tuner in trans department...well, everything really.
My shift into fourth is right there! Personally I think it should be a bit softer in the tow tunes, but I do remember Brian telling me how the TCLU is in three stages (iirc) in the towing tunes to avoid the "slam"
I can live with that. After all it's his tunes and his trans. Something breaks he'll fix it.
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