I find the elevation is murder on the spool up and overall power making ability of the charger too. I lose about 50+hp and 100+trq going from lower elv. (1K and below) to 5K+ elv. when in the 500hp+ range, and it gets worse as the power goes up and the elv climbs. In a way, I'm kind of looking forward to the move down lower (300ft) in the end of March.
My friend and I did a short no boost take off last night in a abandond area. He's running a stock motor with moded reg with a A5K on a LB7. I had only 1 pump going (not driving both) and the GT4202 with the 1.01 exhaust housing. He shot about 100 ft out in front until mine spooled (play times over). I cought up to his speed right quick but the lag was up there. I'm about 1G heavier too. I'll be towing at my GVWR max here in a month or so with the set up. I'll post back the towing ability of it and my findings compared to the A5K I use to run. Even with the lag up here, I love the GT42. When it goes, it ready for a rumble (even in my heavy truck at 5k+ elv).
Oh, just for info. I bent rods at 576hp and 1102trq on an LB7 (twice). I did compression checks at different power levels on a cool motor leading up to this power. At this power the compression suddenly dropped to around 290psi at my elv. (5500ft). Maybe tuneing has some to do with it, but this is not high torque. The rods lasted another 40K bent before I changed them out (ticking time bomb). The heads started to leaked at the 40K point (I pulled the motor 10K later). I'm thinking that when head studs are needed, so is rods. You can make much higher HP for a brief time (as so many has found out as well), but your risking it big time. Just info and my findings. We need some others to do this test as well who thinks there safe after a big power run on a stock motor (actual findings, not "but I think it's ok").
