6.7 Cummins High Speed Acceleration Issues?

[jwynnejr1]

I purchased a new '18 Ram 2500 in June of this year. I've noticed that when I am at highway speed (85 mph or so) and floor it, it really doesn't just take off. The turbocharger boost gauge increases and the rpms increase, but then they decrease slightly and hold with no shifting all while the pedal is held all the way down. Is this normal? No check engine lights, no other symptoms.

 

[mtnrider]

Normal

Couple of things. Obviously these are HD trucks intended for towing so not really known for acceleration and speed. Second, they react better to a steady pedal push/acceleration then romping it to the floor. If you romp it to the floor (especially from a stop) the torque management kicks in and it will fall on it's face for a few seconds. They also rely on the low end torque for pulling so won't always downshift right away, it will chug through at a lower rpm. And lastly, with 3.42 gearing it just isn't going to respond like a sports car.
85 is getting up there as well. It will respond better below that.


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[Nick_rp]

What ^ he said. HD are built to get moving from a full stop with a load. I like to describe low end torque how i describe my motorcycle. Its not fast but it can rip a stump out of the ground. (Not really but you get the picture)

 

[jwynnejr1]

Normal

Couple of things. Obviously these are HD trucks intended for towing so not really known for acceleration and speed. Second, they react better to a steady pedal push/acceleration then romping it to the floor. If you romp it to the floor (especially from a stop) the torque management kicks in and it will fall on it's face for a few seconds. They also rely on the low end torque for pulling so won't always downshift right away, it will chug through at a lower rpm. And lastly, with 3.42 gearing it just isn't going to respond like a sports car.
85 is getting up there as well. It will respond better below that.


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I certainly appreciate your explanation. I upgraded from a twin turbo ecoboost F-150 to this. I've read elsewhere about the torque management system and suspected that may have something to do with the rpm's being governed back down after a hard accelerate. Thanks again!

 

[jwynnejr1]

Normal

Couple of things. Obviously these are HD trucks intended for towing so not really known for acceleration and speed. Second, they react better to a steady pedal push/acceleration then romping it to the floor. If you romp it to the floor (especially from a stop) the torque management kicks in and it will fall on it's face for a few seconds. They also rely on the low end torque for pulling so won't always downshift right away, it will chug through at a lower rpm. And lastly, with 3.42 gearing it just isn't going to respond like a sports car.
85 is getting up there as well. It will respond better below that.


.

Feel free to respond to my other newbie thread regarding a sharp smell that occurs after I shut the truck off

 

[mtnrider]

Feel free to respond to my other newbie thread regarding a sharp smell that occurs after I shut the truck off

I'll throw my 2c in there!

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