working on a tune for a buddy that has a 2010 CCSB, yes crew cab, with a 4.8 and a 4l60/70e whatever one it is... Anyways... been working on it a little bit this afternoon and still don't have it shifting like I'd like it to shift... I've dropped the shift times to where I've set them on a few genIII trucks, and put the pressures about the same as a few genIII trucks i've done and it still doesn't shift as hard as I'd like it. I even upped the brake-coast and the Upshift Br/PwrOn tables to 130psi and it doesn't feel like its shifting all that great. Improved from where it was stock, but still not as good as I'd like it to. Do i need to keep upping the pressure MORE? Or is there some redundant table that I missed somewhere? It pulls pretty strong up to 6100 rpm, but occasionally once it hits 6000 rpm, its like its on the rev limiter, but i raise rev limiter up to 6500

Also, since it's a 2012, it should have VVT correct?? If so, I've read that leaving that stuff along on a stock truck is fine, just advance timing as you normally would on a non-VVT engine. Is this correct?

After this truck is done, I think I'm sticking to genIII trucks! lol

 

bump....

 

Are you upping the base pressure or PWM table?

 

definitely alot more tables to play around on gen IV

 

I've upped every table under shift pressure upshift.. the brake-coast, Pattern x, y, z... also the upshift br/pwron pattern x, y, z..