If you wanted more power maybe you shouldnt have started with a 4.8 liter engine.

 

EXACTLYI SHOULDVE DONE THIS IN THE FIRST PLACE

IM GOING 6.0L92 ,CAM, STALL FOR LESS<<<AND I KNOW IT WILL BE FASTER

 

I want Maggie! 500lb/ft!

 

Where did you run these times? I installed a basic 112 kit + 1 size smaller pully on my friends 05 2wd, 5.3 EX cab and it went a traction limited 14.21 @97MPH in Ca with the Magnacharger tune. The truck was stock except for cat back exhaust. Another friend of mine has the same basic thing on a 5.3L SSR runs 14.50's in Las Vegas 2500' elv. Unless you live at high elevation you are getting robbed somewhere.

 

2X4 5.3 Tahoe 5600lbs on 22's with 3.42's in florida.....Never ran the Maggie tune always been on the dyno. Will be back to the track with drag radials this friday!

 

I would take it to the track and see what it runs. Try not to get caught up in the dyno numbers. When I modded the 5.3, I got stuck in the dyno numbers and I was frsutrated. I started going to the track and got the 5.3 into the 13.40's on the 22's. With the 6.0 @ 448/457, I went 12.5 with slicks, and 13.2 with 22's.

The intake temps @ 11# seem very low. You must have a large heat exchanger set up. Seems that the power past 4500rpm is really falling off. I put the 3.0 pulley on my 5.3 and the intake temps went through the roof. I made a ton of torque down low, but when I went WOT on the dyno, it was detonating and couldnt get a full run on the dyno. Intake temps reached high 100's.low 200's w/ timing around 10-12 degreees. I switched from a 3.0 to a 3.25 pulley and ran 16 degrees of timing and made 406rwhp.

I had better luck with more timing and less boost. Do you give an idea, here is how things progressed for me with my 6.0.

448/457 - GT2-3, TOG mid legths, true duals, 3.1 pulley at 5#

473/503 - same mods as above plus alky kit and 2.9 pulley and tune

503/526

More tuning got me to 512/535. All runs above were made on the same dyno. I made 545/565 on Rick's Dynopack without the 22's. I am not sure if the 22's would cost me 30rwhp, but that is the only difference I could think of.

 

you goin to palm beach international? If so i might come out and check it out, and run mine as well

 

That dyno graph looks like a tune that is aggressively pulling timing with IAT increase.

 

There are a lot of things I would have done differently if I knew the outcome. Wish I could've just done it all myself, at least it would have been done right.

 

I was planning on going to Palm Beach International friday night 2/6.... It was 50* outside during the runs iat were 120* max at full boost.