Trifecta Performance reviews

wlezel · March 22, 2021

@High Country 6.2L/8 @Pearl2017 to clarify, are you guys saying Trifecta CAN tune the 2017-2018 8 speed transmission without it being physically unlocked/modified? Everyone swears it can't be done from any tuner without it being modified first.

And if so, is it worth it? I'm so sick of my 2017 Sierra with all the 8 speed issues, looking for a resolution.

Edited March 22, 2021 by wlezel

Pearl2017 · March 23, 2021

With the Tri-tune the trans has a "sport mode" when you enable CC. Whether that is a trans tune i don't know for sure? seems a lot like Tow Haul mode. I no longer use that tune it never really seemed to be $500 worth of silky smooth and i would have needed to spend more to Iron it out. the truck ran a lot better after the trans was flushed and an update at the dealer. After that putting the tune back on seemed to undo the goodness a bit. I already had the interface so licensed HPTuners to disable V4 mode and adjust timing for slight knocking issue. One thing i would try is if you have larger tires and wheels is to correct the speedometer. IMO the additional mass and diameter has some effect on the trans torque calculations that may contribute negatively to smooth trans function. only time it really acts odd is cold mornings. On those days i put it in 1st gear and slowly roll out ...get a bit of revs then manually go to second...third etc after a few blocks switch to auto and all is good. Also have the trans "Pill flip" mod ...trans behaves perfectly.

ray2005 · March 23, 2021

I don't have Trifecta but I'm pretty sure they use the same program that was used on my 8 speed. I narrowed it down to trifecta or a local tuner. I went local because of having it tuned on the dyno for better results. I was using manual mode shifting a lot prior to the tune, now I rarely use it.

Sent from my Pixel 4a (5G) using Tapatalk

wlezel · March 24, 2021

@Pearl2017 thanks for the info. I googled "trans pill flip" and Google pulled up a ton of "transgender" stuff LOL. So, that being said, can you tell me what that means?

@ray2005 what was the total cost having it tuned locally? I'm assuming you had to pay $200'ish to unlock the TCM module first + whatever the tuning itself cost?

ray2005 · March 24, 2021

I believe it was $550 after unlock and tuning.

Sent from my Pixel 4a (5G) using Tapatalk

Pearl2017 · March 28, 2021

On 3/24/2021 at 5:44 AM, wlezel said:

@Pearl2017 thanks for the info. I googled "trans pill flip" and Google pulled up a ton of "transgender" stuff LOL. So, that being said, can you tell me what that means?

The pill flip is the transmission thermostat. You can flip the thermostat valve plunger and it opens the trans cooler all the time. This will drop trans temps 20-30 degrees. its an easy and reversable mod.