In my previous post, I had predicted this truck would run "12.5 at 110 or so". I received a lot of flack for this prediction, so I went to the track to back up my claim. As predicted, this truck has an abysmal 60 foot time on street tires, and with the nose about 1" higher because the LS engine is lighter, it starts to buffet really bad at about 90 mph.
Coming straight in off of the highway, to the staging lanes, I didn't even shut off the truck. Ran 13.35/108.6 (2.27 60 ft) and 12.963/110.09 (2.26 60 ft), then 12.76/109.99 (2.10 60 ft) with each run driving right back to the lanes. With caltracs and slicks, this would probably be closer to 12.30, which would be better than I predicted. With gearing, it might even see 12.20 or less.
The track prep is excellent, and it was about 60 degrees, but wheel-spin was killing me early on.
Fourth run, I aired down the tires to 20 psi, and had roughly the same 60 ft at 2.15. Right at the lights, there was a brief vibration, BAM, and the sound of my driveshaft following me down the track.
Looks like I am going to need a different driveshaft design.
Broken front flange, damaged exhaust.
What was left of the driveshaft.
Going home on a trailer.
Mods.
6.0 LY6 with 200k miles.
LS9 cam.
Toilet flange and pvc intake
Cast exhaust manifolds, 2 1/2 inch crush-bend dual exhaust
Tuning by HP Tuners.