Yep....after a year of owning the 6.7 turbocharged Cummins, it screams up and down the ALTITUDE induced mountains up here compaired to my 8.1 big block with headers, ECM tune, CAI, Dual exhaust with dual Magnaflows.
And to the guy above that said....you want to drag? Yeah....bring it on up here in the mountains. I will even give your v-8 gas unit a head start. :B I think Dave has moved on, haven't seen any of his posts lately but he put a 502 CI Chevy which had over 500 HP in his 13,000 lb Revcon, I don't think a 6.7 L with 340 hp and weights 30,000 lbs can get high enough to win that drag race.
at Altitude? A naturally gas engine is a dog up here compared to ANY turbo charged diesel......especially with the torque advantage. HP doesn't do it up here.Well, since you woke up an old thread, I suppose I'll respond.
I've been at 8000+ ft before - traveling up S St Vrain HWY to AllensPark. DW was following in the Grand Cherokee and complained she had trouble keeping up. Power to weight ratio, and a well designed intake still flows pretty reasonable, even at high altitude. Only thing that slowed me was the corners, and those not much.
If you want to do the math, I loose about 100 hp at 8000 feet. That still leaves me at 320-340 HP pulling 13K lbs. So yah, bring it on.