Cummins isx 15 dyno graphs or charts

Sounds similar to my c12s power. Try running at 1300 rpm's, it should pull most hills and let the rpm go down to 11 and grab another gear. Winding out the motor doesn't help at all if I'm heavy, it just gets thirsty.

 

check these out.

pass it on to your boss too...

http://cumminsengines.com/every/customer/driver_training.page?


I realize you are driving a Cummins, but Detroit is echoing much of the same information.
http://www.demanddetroit.com/performance/efficientdriving.aspx

Heavy trucks are now going through the same "growing pains" cars did in the 70's/80's. The introduction of the EGR, the Cat converter and the electronics. It's gonna be fun to experience these advances like the cars had. I hated the issues the old electronic carbs had.

 

my experience is the same as yours and i run over 100k lbs

i do think 450hp/1650tq is probably under powered for running that heavy however i don't see why running the motor out of its peek tq would make it accelerate that much faster. a re flash with a different program may help. or possibly something else is not right.

personally i think 100k and over is best suited for min 475/1850 not that less wont still get the job done but its not a enjoyable drive. at least rat has a 13 speed. i drove a 2006 450hp isx unsure of the tq spec for a while a few years ago hauling heavy with a 10 speed and that was down right miserable to drive. of course the fact it was a Volvo didn't help...lol

 

new motor on winter fuel to boot power will come up a bit when motor breaks in. that motor pulls fine with 1ooooo in bc on 6 percent plus grades give it a chance to break in