silveradosammy

It's the starter. I didn't believe them at first and they don't know exactly how the starter is creating the chirping, but they said there's a noticeable reduction in the sound with a new starter. They replaced mine, and it is better but still there for about a second. Previously it would last several minutes after startup.

Update- A couple of weeks after I posted the original review, got a message from Trifecta that they had discovered a bug in my calibration, fixed it, and a new file was ready to try. Weird...So, I tried it. The massive lurching when shifting into gear went away, but the overall tune also went from blah, to undectable gains. Putting it in sport mode just changes the throttle scaling but when I have ran acceleration timers with a couple of different apps, the gains were not consistent enough to indicate an actual improvement to performance. So... I uninstalled it and still wouldn't recommend their Silverado tune to anyone asking. Feels like I spent $600 on a window sticker. My 8sp tranny has developed the heavy clunk, delayed engagement, and violent- as in "what the hell did i just run over" downshift on the highway that has prompted a recent class action lawsuit and several TSB's. There were early signs of the issues well ahead of installing the tune that the dealership kept saying was normal and would diminish when the tranny had finished learning. That's why I originally started looking for a tuner to clean it up. I don't think anything Trifecta did made it worse, but it sure didn't make it any better or prevent the demise that's being seen by many.

wrong post

I don't recommend them. Had the advantage plus in my '17 6.2 8 speed and ended up uninstalling it. Program was buggy and the customer service is not great. When i installed the tune the tranny shifting was firmer, and clunking disappeared at slow speeds but it eventually started coming back.

Something i forgot to mention, I noticed it pulls harder at a stop light in sport mode with my foot on the brake and found the truck creeping forward a few times. Turn on Eco mode, the RPM's dropped about 200. Turn on sport mode and they climbed about 200.

For now, don't really miss the tune. When it gets cold this winter i may reload it and take some video, but not overly exited at this point.

I installed the Advantage + in my 2017 6.2L. Tranny shifts nice and the truck is more responsive but after 10,000 miles with the tune, a little towing, lots of highway and plenty of city driving, I uninstalled it. Overall feeling- Blah. What attracted me to Trifecta, like others, was their ability to tune the TCM. The program switching from ECO with the CC on, to sport with the CC off, to tow mode was a neat feature as well. First thing you notice in sport mode was how responsive the throttle is. After a little driving though and switching from eco to sport- you can tell they changed the scaling pretty dramatically. Nothing happens past the "click" in the throttle travel anymore and it feels like your at WOT before pushing though the click. This is the first tune I've had with such a noticeable change in throttle scaling and I've had Blackbear 2x, HP, and a Livernois tune on a 14 Ecoboost. I can tell it wrapped quicker as well so they may change that scaling to compliment other PID changes. The tranny shifting was definitely better, and most noticeable in sport. Pulling a 6K lb boat through some hills in southern Missouri in tow mode felt pretty good but not significantly better than stock. Shifting is firmer at all speeds and loads and most noticeable at slower speeds. Mileage was super erratic on the long pulls due to wind so no measurable improvement, but I didn't have any reason to believe it would improve (see below). Now for the bugs. The first thing I noticed in the first 1000 miles was a steady decline in the mileage. Trifecta advertises a 2.4 increase in mileage in eco mode, but I saw a 2+ mpg decrease. Sport mode was even worse but that's easy to blame on the foot. I used the same pump at the same station and tried everything I could to limit variables but I was always between a 2 and 2.5 mpg decrease on the highway with the tune installed vs stock. I track every tank and have data back to the first fill up using milage/gals that i track with an app on my phone, not the mileage gauge on the dash. I was actually getting better mileage when it was 25°F outside with the stock tune than 85°F on the Trifecta tune. Second bug, and the one that scares me, is when the temp is below 60°F on a cold start in sport mode, the truck will jump forward when shifting from park to reverse or drive....enough to leave black marks on the drive way. The colder it is, the worse it gets. Typically when I shift out of park, the RPM's would jump to between 1500 and 2K and slam into gear. The highest I saw was about 2200RPM's before dropping into gear. Doesn't do it in Eco mode, only sport. I let the truck warm up for a minute or so while I plug in the phone, pick some music, grab the shades, and by that time it is idling back down to about 1000 rpm. Put it in reverse and wham! Trifecta's customer service- not great. I told them right away about the mileage decrease and they said "it's a performance tune". I said "Yeah, I get that, but you advertise an increase in mileage in Eco mode and my data indicates a consistent decrease". Their response- " We can't do anything about your hand calculations". Not an impressive answer. When I inquired about the revving when cold it was an even worse response--"If it does that in Sport mode, then don't start the truck in Sport mode. If you want our engineers to review it you'll have to send in video". By the time I figured out how to consistently replicate it, it was too warm outside most mornings for it to rev much past 1000 rpm. Made a trip up in the mountains in June and woke up to a 35° morning. Hopped in the truck and forgot to capture the video. Not safe to wait until November to record it in the act, and not driving 800 miles to record a video for them, so I uninstalled the tune. IMO If I had to do it over again, I'd go back to Blackbear or HP. I had a small bug in a Blackbear program a few years ago and they went over the top to get it fixed. If it felt like Trifecta had any interest in trying to diagnose reported bugs I'd leave the tune in and try to work through it. At this point I'm terrified of the Mrs or someone else hopping in my truck someone getting hurt- not worth the risk, and apparently, not worthy of Trifectas time.

I do have a catback that i installed when the truck had about 1000 miles on it. Also get a huge spike in the idle if i have it in sport mode and shift from park to drive after a cold start. Truck lunges forward hard! - but only does it once. I also noticed they are bumping the idle about 200rpm in sport mode and they definitely changed the scaling on the throttle. Going past the "click" in the pedal is just more travel but doesn't trigger a kickdown like it did stock. I really don't mind that though. If I turn the cruise on and off while sitting at a stop light my RPM's go up and down about 200. MPG on the last couple of tanks is still to the negative. The last tank i did some hypermiling for about half a tank and it brought it up to only -1, kinda defeats the purpose of the tune though. I'm going to give this tune a couple thousand more miles and then pull it out if it doesn't start to clear up.

I installed the Advantage + in my 2017 6.2L. Tranny shifts nice, but i'm seeing a 2+ mpg decrease in mileage in "Eco Mode" . They advertise up to 2.4 MPG increase, which i wasn't expecting, but sure didn't expect to see a noticeable drop. This is the 5th truck i've tuned -2 from Blackbear, 1 from Livernois for my ecoboost, and 1 from HP but this is the first time i've had a tune noticeably decrease mileage on a road trip when cruising at 60. On the others I've seen a 0-1mpg increase with Blackbear doing the best. I e-mailed Trifecta for feedback but wasn't real impressed with their response. They said the MPG display is an average, yadda yadda, I explained I'm not using that display on the dash, i'm calculating based on fill ups from the same gas pump, at the same station. Their response was " Not much we can do about your hand calculations". That made me laugh. Overall it's not a bad tune, but for the money i'm going back to Blackbear on my next GM tune. I had a few bugs on a Blackbear tune several years ago and their customer service was over the top.