Our tracks sucks, nuff said.

 

I agree with what's been said, but I wonder about your tune. Are you logging to see where your timing and AFR is at? Also, what is your shift RPM. My truck with a much smaller cam will pull like a b!tch to 7000, if I let it, so you should be shifting at like 6800RPM, at least. You want like 29-30 degrees max timing and an AFR in the high 12s (like 12.8). I can't get mine there (I'm at 12.0 to 12.4 max), but after some research on the EFI Live forums, it looks like that's because I can't tune the VVE properly with EFI Live with the VVT enabled (that shouldn't be a problem for you with the VVT deleted).
Also, you need to change your shift times and pressures in the TCM and minimize or delete Torque Management in the ECM and TCM. I have a tune w/ no TM in mine now, and she damn nearly comes off the ground on the 1-2nd shift!
I do think you would have been better off with a cam with less intake duration 218-222 deg max and a tighter LSA 112-113 (especially with the VVT disabled) and the convertor is a bit loose for a truck like what we've got, but if you don't have it tuned properly, you still can get quite a bit more out of it.
4.10s will definitely help, I like mine!
I'll bet your track is a damn sight better that what I'm running on, but I agree that you should be getting a better 60' than that, like a 2.00sec at least.
But if you want a quick, easy, way to get it deep down in the 12's, just spray it with a 125-150hp shot of N2O! You gotta feel what that's like on an AWD!
I just put a progressive controller on mine to kill the wheelspin in 1st (with the 4.10s she's ripping the tires badly in 1st on the spray). I'm gonna see if she's got a 7.7 in her today.

 

BTW: My N/A 1/8 ET converts to like a 13.3 at 101mph 1/4mile ET, and if you do the calculation, that 101mph means that it takes approx 525 flwheel HP to push my 5700lb truck (race weight) that fast, so I don't think you're that far off.
From what I've seen, ported heads and a big camshaft like you have on your truck only make about 20hp difference on the L92, at high rpms. Hell, I think with what I've got on my truck, the stock truck manifold and the MAF are both bottlenecks.
I don't know of too many other 5600 - 5700 lb. vehicles that can run mid 13s @ 100plus!!
Don't be disappointed man, it's a flying Brickhouse!!

 

i only have like 24-25* of timing and a 12.6-12.7 afr if i remember correctly. also im full weight. my truck has ran the same mph since ive put the 6.2 in. imma see what the truck will do with the new 6spd. also i agree the 218-224* intake max. id look into the comp cam and a couple of others. i bet your truck would do better on a 222/234 .595.602 112+3 since you already have some badass heads and bigger exhaust.

 

i am full weight and have a best of 12.73 @ 104.54mph with just a cam and mild milled heads (20thousandths) stock intake no port work and thats with a 4spd and a PI3600 single disc. yalls trucks are close on my *** with the 6spd stock stall or stock cam.
i only put down 352/380 in 2nd gear on 3:42s and a 32" tires with a 278mm Circle D 3200 converter. my best with that 3200 was a 13.0 @ 104.2mph consistantly.

6.2 stock bottom end
milled stock port heads
stock intake
90mm TB
4" custom CAI
228/236 .588.602 112+2 cam
UD crank pulley
PI3600/Billet servos
pacesetter LTs/OR-y/36" magnaflow
4:10s/Tru-trac
Truckshop tune
i race with a full tank of gas or 3/4 tank i do not run my truck on a 1/4 tank.
i carry a 3ton jack, breaker bar, sockets, and a few other things to work on my truck.
im also a 2wd with 265/70/17s up front and 28" M&H DRs out back

 

my afr is at 12.8-12.9 on the 1st gear after that its a 12.3-12.5 , timing is around 23-26 , actually this cam was spec'd by ed curtis @ fti i am really happy with the way it drives! + he is a knowledgable guy so he wont just spec any cam.. what i told him was that i want the best 0-120 acceleration im not looking for top speed or anything , so this is the cam i got.. i dont think the cam is the issue here.. my 60ft is at 2.2~ due to wheel spin because of the crappy asphalt at the strip how ever on the street i beat Jeep srt8's from a dig , i think the my shifting point is quite low... 6500rpm.. is it safe to go more? and about the tune.. i was getting around 14.1 with a tune from a local tuner , then i bought my self a wideband and got a mail tune from mike @ new era.. and im really happy with it!!

 

yeah im close at about 104mph.. my intake manifold is stock , i know its a brickhouse , hahahahaa im only 18 the reason i bought a yukon denali! was because the cops over here do random checks on vehicles driven by teenagers which are usually , nissan patrol safar *look it up i dont think u guys ever saw this* land cruiser , fj cruiser , sierra / silverado.. as well as those ricer cars.. i never get stopped ever because mine looks like a big old family car hahaha but as i said i can get the tyers to hook up on the strip i could get a much much better time.. thinking of 4 DRs i think ill get me a g-tech today and check out the time on the street and update u guys

 

throw a set of slicks on there.


your cam requires a better 60' i bet if you hooked that **** would be retarded fast!

 

stangklr went 13.53@104 today in his with a muffler and a tune.

i went 13.75@101 in 3k DA with a muffler and a tune
see sig for current times n stuff

myself and stangklr are also 2wd. cloth seats. little things here and there add up. i tip the scales at 5040. messed up part is, everytime i hit the track i have a full tank of fuel

 

being a "heavy" truck for it to 60' and actually be faster you need a torque designed cam. it takes a lower rpm HP/TQ cam to make the truck/suv move. the thing is i bet that denali is a monster from 30+
id raise my shift points to 6800 imo