I ended up going 5 to the left on the programera and my DIC says that i'm getting 2mpg better...is that posiable, i was getiing 13.5 now 15.5, i cant believe thhat its posiable with the lift and big tires? Anyways the truck runs awesome, huge difference on the highway ut ripes if i step on it at 65 ...

thanks everyone, i allready read it a bunch of time but sometimes its better to be sure :) I'll let you know how it runs, hopeful better gas mpg!! Its a 2007 Silverado with a 6 inch lift and 35's with 3.73 so its a bit doggy at 65-70...it really needs 4:10 but i really dont want to do that now!! At ...

now what kind of things should i notice when i make these changes, do i have to make the changes on both sides or do i just go into the programer and select modify tune and select injector slope and move it left negitve 7 from 0 where it is now right.

but i can still drive and look at the log on the programer, and get a ballpark reading right?


now i'm only concerned about the long term injectoe right

I have 305/60-20 set in my programmer with the 87 tune on my 07 nbs silverda and the Staility light and traction came on one time about 6000 miles ago but everything works fine for me...the tire are really 34.5x12.5-20, i read that 35 or bigger the lights come on.

Well i tried to log yesterday and did the short and long log on the programer but it only logd for 1min 18 sec? It looks like the long injector is around 6.47 though so can i just do -7 to get it in range or do i have to do more loging? seem like everyone is about 5-7 high so can i just -7 to get to ...

My 07 NBS does the same thing, i always look to see if someone hit me, i think mine did it before the tune too but not 100% I wonder what gm says about it.