My truck is a 2008 Silverado Z71 ecsb with factory 265/65/18 tires and factory drivetrain. Mods are blackbear 93 octane tune and corsa db muffler with the 5.3 LY5 engine.

I got it dynoed at Corr Performance in Port Allen, LA and they have a dyno dynamics dyno aka heartbreaker lmao. I did 3 runs in 2nd gear fearing that I may break a driveshaft past 100mph and got a best of 249hp/270tq I will post up graphs when I get them. My a/f ratio was rich as ***** at about 11.ish throughout the rpm range so I'm sure theres some more power left in the tune, but as with most mail-order tunes they are playing it safe. I'm sure 2nd gear didn't help the numbers, nor does the 4wd drivetrain.

I'm kinda baffled because I looked at their website and they show a "stock" vortec max 2007 Silverado made 305hp on the same dyno. Anyway I'm pretty happy with the numbers and now have a baseline for when I go FI

 

Wow 11 AFR after the tune, did he even touch the fuel?

 

yea I'm asking if justin even touched it


what a dumbass dyno operator. That couldn't be good for your rearend and trans. Did it scratch the front bumper hitting the fan?

 

yall shoulda edited that video what's the shifts set at? not bad for a stock 5.3 with a tune and muffler only, plus a 4wd at that

 

Damn dude that's some crazy ****.
Lucky he had it in 2nd & not in 3rd, they could have killed someone.. Btw good numbers

 

stock vmax is a 6.0

 

wow that coulda been really bad!
Why you at CORR thats a import shop ?

 

So you're thinking my fuel tables are still stock after the tune? meaning justin didn't mess with them at all? I may ask him for a retune to see if we can squeeze a few more out of it.

Shifts are at 5800 across the board. Im guessing with a retune and a 3rd gear run I could get about 270rwhp....but like always these are only numbers and a tuning tool. Track is where it's at.

 

I didn't do any tuning yesterday, it was a dyno day so I wanted to see what my truck would make. Good deal on a dyno and good fajitas!

 

after a tune, your af ratio should at least be in the low to mid 12's, regardless of it being a mail order tune.