'08 GMC Sierra 4.10, 6.2L, 6L80E does 13.1!

[iamkeniff]

well, i got a phone call from Geoff @ EPS in Baton Rouge yesterday. he said that the truck drives a lot better, and it shifts just how i want it. *shifts smooth and stockish at anything below 1/2 throttle, and WOT is a bit on the extreme side* he also made it to where no matter how short of a tire i run, it will never hit the rev limiter again.
he made 2 passes and each pass were in 3rd gear, converter unlocked. im not really worried with the dyno numbers, i just want it to be a safe tune, and it do what i want.

386rwhp 1st pass
390rwhp 2nd pass

pretty happy with the bus, but im sure ill add some more stuff later on as in bigger LTs, exhaust, intake, head work, and a EPS cam.

[SSilveronyxx]

Get that thing back to the track!!

[iamkeniff]

i hope to go Wed coming, unless i dont have a driveshaft under it. still fighting a vibration at 100+ im hoping its just a weight on the shaft or the pinion.

[gspfunk]

Updates??

[iamkeniff]

nah man...i just got a new puppy so ive been hanging with the fiance' and him

i did put some miles on it and i must say, ANYTHING over 30% throttle it chirps the tires and the shifts are fast and crisp like i wanted. i think itll click a 12.9x-13.0x if the truck will hook an has good weather.

im not going to be able to get to the track anytime soon because im taking my driveshaft back to the person that built it and if they say its fine im taking it to MadMan Racing & Co to have him send it to whoever builds his driveshafts so i know its right.

[blackawdtbss]

this truck is sick. can you imagine this combo in a reg cab 02 step side! much lighter! or even in a colorado or s10! hell yea!

[iamkeniff]

Ok guys i have been to the track since and its been forever since ive been over here. Small update:

Nothing on the truck has changed other than the tcm tune and i ran in full weight!

Spare tire, 20" rims all the way around, tools and full tank of gas


My truck straight off the street went a 13.31 @ 107.6 then backed it up with a 13.33 @ 107.9 with a sissy 2.0x 60'. It then caught some traction and ran a 13.2 @ 105. I havent been back since ive raised the shifts a tad and firmed up the shifts a little more. I do run TM with it pulling 6* of timing on the shifts. I plan to upgrade to a 1 7/8" header with dual 3" cut outs and 3.5" exhaust later on.