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Best way to make shifts "softer" and more luxury-like
I have a 2012 Chevy Impala with a 3.6L LFX engine (300hp) and a 6T70 6-speed transmission. I've never really been a fan of the way the 6-speed transmission shifts - I like shifts to be as smooth and unnoticeable as possible. I realize that most folks like to "firm up" the shifts for better performance, but I'm not concerned with performance and I'm interested in the most effective and safest way to make the shifts as "comfortable" as possible (like a luxury car would feel, such as a Cadillac). Again, performance is a non-factor for me - I've maybe did 5 WOT's since I bought the car over a year and a half ago - and even then I only did it on the highway during high-speeds, just to see what she had (I never do WOT from a stop and never really *needed* to go WOT). I couldn't care less about how fast I can get from 0-60mph and would never even think about racing in my 4-door family car. :-)
I'm VERY new to tuning (first car I've ever even considered customizing, mainly due to the way the transmission shifts). Stock low-speed shifting is absolutely horrible (clunky, jerky and "un-refined"). I did purchase a mail-order tune because everyone was saying how much "better" it shifted with this tune, but I quickly realized that "better" means different things to different people. For my preferences, I feel that it made the shifting even worse (much firmer and less "comfortable" than stock).
So, I'm curious as to the most effective and safest way to make the shifts smoother and more comfortable. Not sure if I should be increasing the shift times, lowering shift pressures, increasing the amount of torque management or a combination of all of the above.
So far, I've disabled neutral skip-shifts, disabled TCC lockup in 1st-4th gears and slightly modified some torque management settings. Between the mail-order engine tune (which makes the throttle feel much better and more "natural") and the transmission-related changes mentioned above, I'm much happier with the way the car shifts now. But, since I purchased an HPTuner device to apply the mailorder tune anyway, I want to see if I can use it further to make the shifting even more "comfortable".
I've attached my stock tune file here. Since my current "active" tune contains engine-related changes from a commercial mailorder tune, I can't post it, but I've combined the transmission-related changes from my current tune with the stock engine tune and posted that as well (so you can see what transmission-related changes I've made so far).
Thank you in advance for any advice you can offer! I'm really enjoying my HPTuner device and love being able to customize things to my liking - just need to learn a lot more! :-)