My buddy is buying a 6.7 andf thinks it is very sluggish in O/D when stopping on it. HE said my 5.9 felt like a rocket compared to this. it is a 6 speed auto 2008 big horn.
this 6.7 has 13k also could that be some of the issue?

DPF, can you just unplug it without any side effects?

 

hmm i would almost say that something is wrong with the 6.7 if it was sluggish comared to the 5.9 is it stock? manny or auto?

 

thats what I thought as well. it is a 6 speed auto. I told him to try it with the O/D off and see if it is better.

it does have a jake brake too. very nice truck

 

The drop in rpms in 6th is insaine, If it doesn't downshift when punched, yes it is a slug. I think when I was drivin my buds it was at 1350 goin 70

 

he said it did down shift when he punched it and it was still a slug. when he gets a chance he is going to drive it with the od off. that should tell him if anything is wrong with the truck. I am guessing the low rpms are what does it. I also asked him why that would be so importatnt.

 

Turbo could be sooted up and not allowing the VGT function to work properly?

 

just to add the truck is completely stock, if that makes a difference

 

nope, no differece at all... Crap egr design does it.

 

The '08 6.7L we de-BlueTec'd in the shop last winter was such a slug while baselining that I had to pop the hood just to make sure there really was a Cummins in there somewhere.

 

your buddy must have a 3.73, cause i have the 4.10 and at 73mph im sittin at 2k rpm. but even then when i stomp on it, she downshifts.