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Old 06-07-2015, 08:07 PM   #11
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Tom_OC,

I think you will find www.turbodieselregister.com a very good source of technical and practical knowledge for your Cummins Ram truck.

I use the exhaust brake all the time so that the vanes in the turbocharger do not get crusted with soot.

The exhaust brake is a great thing when towing. Everything I have read or heard is that the recent two-stage E.B. is a big improvement over the single stage (what I have.)
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Old 06-07-2015, 10:36 PM   #12
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We have a 2015 RAM 3500 Dually Laramie Longhorn with Aisin transmission. We were told to use the exhaust brake when towing going down grades. It has worked well for us driving across the country a few weeks ago.
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Old 06-15-2015, 08:45 AM   #13
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All I can say is WOW! Just went on our first trip and although it was level ground all the way, we still put the exhaust brake on auto. What a difference in stopping. Did not hardly even have to use the brake. Just love the sound of that kicking in! My wife said I was just like a little kid with a new toy!
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Old 06-15-2015, 09:22 AM   #14
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That is pretty much what I said on my first trip with the truck and trailer. Is a great tool.
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Old 06-15-2015, 12:35 PM   #15
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I leave it off when not towing and in auto when towing. Love it. After reading this thread I might try auto when not towing.
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Old 06-15-2015, 12:54 PM   #16
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Keep it on

I had an issue with my 2013 Ram Cummins diesel brakes. I would have it in the off position and it would come on while driving down any size hill even when not towing. I asked Dodge about it when I took it in for service and the guys who drove Diesels all said they keep it ON all the time as many others here mentioned. I go back and forth when not towing but I always keep it on when towing, even when I am just driving down the freeway or city streets. It probably drives the people nuts behind me as I am not "braking" as I slow down to the lights.
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Old 06-15-2015, 10:12 PM   #17
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I use auto when towing (most of the time) and off when not towing. Towing 15500 lbs and it does great on the west va hills. I have used "full" on some very steep switchbacks though (10-15% grades). 2014 3500 here
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Old 07-27-2015, 07:18 PM   #18
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Tom,

So we have the same truck and I also did lots of research on this. In the "on" mode engine braking will occurr immediately upon accelerator release assuming you are above the minimum threshhold. This is about 1500 give or take rpm. In the "auto" mode engine braking occurrs only of the vehicle is accelerating after release of the accelerator.

There is no advantage or disadvantage of using either mode when not towing. Obvious advantages while towing with both modes.

Why have an off mode then people often ask, well there are local towns where engine brake use is prohibited due to noise ordinances.

Your truck has the DEF system and automatic regeneration of the filter build up so no real need to use it when not towing other than it will help with brake wear as you will use less

Hope that helps
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Old 07-28-2015, 05:30 AM   #19
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Quote:
Originally Posted by msnyder755 View Post

Why have an off mode then people often ask, well there are local towns where engine brake use is prohibited due to noise ordinances.
Actually the Ram Cummins engine has an exhaust brake, not an engine brake, which in theory work quite similar, but the exhaust brake is not prohibitive as are the larger trucks with the engine brakes. The exhaust brake still expels all the energy through the muffler, thus does not create the loud rattle like the big rigs.

Additionally, the exhaust brake will help in colder weather to improve heating up the cab when idling and operating
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Old 07-28-2015, 08:07 AM   #20
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I tried the auto mode when not in the towing mode and never even heard the braking kick in. Maybe my hearing was bad as the inside is fairly quiet compared to other trucks I have been in. I now just use mine when towing.
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