Ok, IMO it's time to have a discussion about the various shifting issues these cars have in general. Those of us that actually race them have to deal with whatever shift issue their particular car has. The issues seem to vary from car to car. I lifted this from a post Ron put in his SS thread sort of as a jump off point for discussion:
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So, at the Legion of Demons event the next weekend I went a little faster. But no new article. The car had hiccups. It was frustrating because FCA said this car would work better for what I was doing and I cannot keep buying car after car. Right? I had the HpTuners and they did not have support for the TCM Adaptives but they DID have it for the PCM. I thought maybe they were grouped together so I reset them. Wow, the car made a few good passes. But then the Hiccups returned. I reset the adaptives and a few good passes. But it still would not follow a perfect pattern but the pattern was there. I was told by Curt that when I reset the adaptives the engine made LESS power and that is what fixed the Hiccups temporarily. When the fuel trims came in the power would return along with the Hiccups. I actually had a Hiccup on the 1-2 (rev limit) and the 2-3 (transmission protection). So, with the DA and the weight reduction the car was getting outside the factory calibration and that was causing a MALFUNCTION. So, at the end of that day, Curt was helping me REPAIR the Problem/Malfunction. So, some want to say I was doing a Trans Tune. But it was not in the sense or designed to make the car any faster per se. I just wanted to do what was necessary to eliminate the hiccups and let the car run as fast as it could, stock. If the fuel trims were leveled out and the car did not hiccup, I felt the car could have had a high 9.80 in it during some of the best DA. Also note: the PCM was never unlocked. So, I had to be extra careful to not brick the PCM. One person that trashed some of my threads, and was really mean to me, did point out that you can tune the TCM and not have the PCM unlocked. The TCM’s are not locked. So that was one GOOD thing that came out of him coming in there like a wrecking ball. Unfortunately, that will never happen again.
Our first small change was to increase the shift pressure. The DA was dropping because the sun was just going down and they had just done a full prep of the track. So, the track was on point and the DA was getting better. The car ran 9.94 and then a 9.90. Good DA and NO Hiccups. In fact the shifts would be at a LOWER RPM because of the harder shift it will complete faster/sooner and pull the motor down away from the rev limiter. But it was spinning the slicks on the shifts and that is not really the fastest way down the race track. Every Tuner knows that and a performance tune would not be set up that way and would likely be combined with an unlocked PCM so you could raise rev limits and shift at a higher RPM. So, if you want to say I tuned my Trans and that is how I got the 9.90, that is fine. Did the change we made make the car faster. Hell yes it did, because it finally allowed the car to work right. But was it intended as a performance tune or modification. No.
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First off, there are discrepancies in what various people(read customers) are being told about tuning the transmission without having to unlock the PCM. I suspect this is causing the confusion that one would expect from this.
Second, the shift issues seem to run the gamut from the dreaded 1-2 hiccup, and insanely hard 1-2 shift w no hiccup, a 2-3 hiccup, an early 2-3 shift causing significant loss of momentum early in the run, etc. ...
I personally have ZERO interest in "tuning" my SS. I do have a shift issue that's causing a decent loss of et. So, what is there to do?
I've called my local dealer and their suggestions are:
a - do a reflash to the trans and let it relearn from scratch and hope it helps. This is quick, simple and can be done while I wait.
b - leave it there for a couple of days and let them do a complete diagnostic on the car to see if they can find a sensor or such that's reading out of whack.
Honestly, neither is a very appealing option to me.
Personally, I kind of like the idea of tuning the trans to make it act like it should have from the factory. IMO, it's hard to call a car that had the trans tuned "stock" and I don't care for that. Plus, there's the cris-crossed information about whether a trans can be tuned with first unlocking the PCM.
This whole deal seems like musical trans issues to me but it would seem that it's what we're stuck with...