Diablosport Forums

I just want to start off by saying WOW!!!! The new Trinity update for my 2009 Silverado 5.3L 6spd is amazing. Too amazing for me though. When I go to WOT, my truck downshifts HARD. What I mean by this is when I was doing about 75mph and went to WOT, my truck barked the tires and took off like a rocket. I did this three separate times, over about a 75 mile period, to make sure that it wasn't because the ECM was still "learning" the new tune (plus I was enjoying it A LOT). I would never believe this if it hadn't of happened to me. By the way, I installed the high octane tune and turned off the speed limiter and DOD. I can't believe that I'm asking this, but is there any way that I can calm down the WOT downshifting just a little bit? It downshifts so hard that I'm afraid that my tranny and/or rearend can't handle it. Any advise? Is this normal? Thanks!

great to hear!!

the shifting is normal, Johan developed these tunes on his 2010 Sierra.

Does his bark the tires doing 75mph? I never thought that a stock 5.3L would be capable of this. Awesome job Johan!!!