Cruise speeds going downhill, slow up hill ?

Racer57 · Dec 22, 2016

2016 5.7 1/2ton
Whether cruise set on 55 or 70, go down 55mph 2 lane hill or 70mph interstate hill it will speed up 3-4 or slow down 3-4. Vehicles are suddenly on my rear when going down hill. Dealership says its normal, but I've never had this much of an issue with other brands. Is there an issue ?

mtofell · Dec 22, 2016

Every vehicle I've ever had has some variation or least a lag before it figures out what it's doing and "catches up." My Ram is about the same as the others.

Are you saying your isn't eventually settling back at the speed you have chosen?

Racer57 · Dec 22, 2016

It does, but the delay is a lot longer than anything I've owned. I'm 62 and have owned ALOT of new vehicles.

MANual_puller · Dec 22, 2016

Racer57 said:
It does, but the delay is a lot longer than anything I've owned. I'm 62 and have owned ALOT of new vehicles.

The delay is worse on a lot of newer vehicles, chevys are about the worst. They can't hold a constant speed sitting on jack stands. I believe it's done for fuel mileage so they don't kick down over nothing, they wait to make sure it's actually a hill before kicking down. I don't have this problem any more with a little trans tuning :happy107:

blrmkrl83 · Dec 23, 2016

It's hard to say if there's an issue or not. It depends on how steep the hill is. On the highway heading out of town I don't use cruise because it can't hold speed worth a crap on the hills and kicks down a lot. When I get on the interstate it holds it pretty close to speed. I would say within 1 mph. There's a few other hills on highways around here it doesn't do the greatest, but for the most part it holds pretty close.

MADDOG · Dec 23, 2016

When in tow haul mode or manual mode, mine will slow down when going down hills if the vehicle's speed exceeds the set cruise speed by 4 - 5 MPH. Also, it will kick down when the vehicle's speed is 4 - 5 MPH below the set cruise speed going up a hill.

In full auto on flat ground it holds the settings very well. When going up and over hills in full auto, which ain't very often, it seems to take longer for the vehicle to start slowing down or speeding up, depending on what side of the hill I am on.

stimpy433 · Dec 23, 2016

It seems like my RAM is a little slower at making corrections for going up/down hills then my Challenger.

dkmesa · Dec 23, 2016

I don't notice it too bad with my Ram. My old Infiniti did the same, and it irritates the heck out of me on road trips. I'd prefer it to go the set speed up and down, but if anything it'd be better to go faster down and slower up for both the flow of traffic and gas mileage.

crazy_luck · Dec 23, 2016

Going downhill, mine will pick up 10~12mph before the system does anything, which is usually at the end of the hill when physics starts to correct the situation before the truck does.

Going up hill? If I set CC at 55, it will slow down to 40 before it kicks down, then it will accelerate to 62~65 before letting of.

Flat ground? Craptacular as well - set cruise at 55 and it will hold 54~52 all day long. In the 2 years I've had it, it has NEVER held the speed I set it at.

My '06 Charger? Set it at 55 and it holds 55 - up hill, down hill and on flat ground.

huntergreen · Dec 23, 2016

didnt feel this with the 3:92 gearing. maybe the hills werent steep enough.

Cruise speeds going downhill, slow up hill ?

Racer57

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mtofell

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Racer57

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MANual_puller

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blrmkrl83

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MADDOG

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stimpy433

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