72dan

I tuned my 2014 Silverado in 2016-2017. I never fully understood the software, there are classes for it. But made some changes based on what I read. I shortened shift times, reduced torque management and I believe some engine timing from a posted corvette tune. It was okay for a while, sometimes a glitch and on the edge as far as knocking. Now it's hot weather and more frequent problems but also in the sold some bit. At part throttle it will surge, kind of hunts between gears, then will throw a flashing engine light. My notebook computer was stolen years ago and lost the software. Just bought it again, have my original and new tunes. Will put it back to original and then need to tune again. First question, is anyone experienced here with tuning the 6.2L engine with the 6 speed, that combo was only offered for a year or two, then 8 speed. It was far from optimal stock, the torque management I was convinced I had the 5.3 liter motor. The point of the bigger motor was torque to tow. I have since sold my trailer so I don't tow but still for acceleration reducing the torque management probably reduced 0-60 mph by a full second. I have seen some stuff about changing out the thermal bypass/management valve on this transmission. I know I need a fluid change and am guessing it is in the pan, want to get is done at the same time. Are there some shops in the Los Angeles area that other members here can recommend to do that work. Even with the tuning I did the shifts are nothing like my E92 M3 DCT. That trans is stock with the GTS software, chirps 2nd and 3rd gear every time, downshifts quickly when in auto mode and I hit the gas. The mapping on that car got better over the years as BMW kept refining it. GM doesn't seem to do that. Is is possible to get quick hard shifts under full throttle, enough to chirp the back tires in 2 wheel drive? A have 4 wheel drive and there are different profiles to program.