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Old 03-22-2020, 09:24 PM   #1
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Exhaust brake

I am the proud new owner of a 2020 RAM3500 dually that tows a 16k 5th wheel.
I cannot even feel the load!!
Anyway, I was wondering about the exhaust brake which I think works great.
Is there any downside (maybe fuel economy) to leaving the brake in automatic configuration. It sure helps on hills and downshifting to traffic lights.
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Old 03-22-2020, 09:29 PM   #2
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No harm/no foul and mileage difference not really noticable (unless you are OCD about tracking mileage)


Besides....VGTs need to be used/exercised so that will continue to function
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Old 03-22-2020, 09:30 PM   #3
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Not a bit. Every time I started my Ram dually I aftivated the EB switch. Only time you might not want it on is on slippery conditions. Because of its design it needs to work or it can get clogged up and eventually fail.
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Old 03-24-2020, 11:12 AM   #4
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I had two ford 350's and now a monaco coach with a cummins engine... all three had "engine brakes" (as opposed to exhaust brakes) and I left the brake on 99% of the time...
on the trucks that towed 38' fiver, to save the brakes and
on the Monaco to help bring the 45k lbs to a stop much quicker...

If you have cruise on OR don't let off the throttle, the brake does nothing
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Old 03-26-2020, 05:55 PM   #5
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engine braking

Thanks for the help. I stand corrected as engine brake. Does that mean I don't have to pay attention to those signs in communities that say "no exhaust brakes"?
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Old 03-26-2020, 09:46 PM   #6
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The Ram trucks with a 6.7 Cummins engine/CTD, have an exhaust brake via the variable vane turbocharger. The engine brakes(optional) change valve timing are only on heavy-duty diesel engines like the Cummins ISL/L9 and larger.
Two entirely different systems.I agree with 450Donn.
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Old 03-27-2020, 06:01 AM   #7
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If I know the difference

Used to live about 2 blocks from an exit ramp from highly traveled 4 lane and could easily tell when it was a dump truck coming to a stop !!!

That's why a lot of cities say no exhaust brakes


when activated it opens a flap valve on the exhaust and is almost as loud as an unmuffled straight exhaust - think large rock haulers whereas, as stated, an engine brake uses the adjustable vane turbo to create engine drag with back pressure...
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Old 03-27-2020, 08:23 AM   #8
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Exhaust brake

Ray - thanks for the clarification. It certainly doesn't sound like a big truck exhaust brake.
One thing I was unclear about - when I am watching boost pressure on the instrument cluster and have engaged the exhaust brake, i do not see any boost pressure recorded.
I would have thought that there would be some pressure on the turbo as it exhausts? 2 different systems?
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Old 03-27-2020, 11:20 PM   #9
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Exhaust brake operation explained by Jacobs engineering:
"By increasing backpressure to the engine, the exhaust brake forces the pistons to push against additional force during the exhaust stroke, slowing the crankshaft’s rotation and helping to control the vehicle speed. Overall, this requires less use of the service brakes, giving them a longer life and reducing overall cost of ownership."


The increased backpresure greatly slows turbo rpm, which in turn reduces/stops boost pressure in the intake manifold. This is possible because a diesel engine has no natural intake vacuum.
Exhaust brakes reduce flow of exhaust gas, and are not noisy like Engine brakes, which alter valve opening/closing.
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Old 03-29-2020, 08:27 AM   #10
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turbo boost

Thanks for the explanation.
I am so new to this truck that I just found another panel for the instrument cluster that shows exhaust brake pressures.
Guess I should have kept my mouth shut until I had more than 2000miles on this beast.
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Old 03-31-2020, 09:25 PM   #11
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Quote:
Originally Posted by Pathvet View Post
Thanks for the explanation.
I am so new to this truck that I just found another panel for the instrument cluster that shows exhaust brake pressures.
Guess I should have kept my mouth shut until I had more than 2000miles on this beast.
Many people confuse the distinction between exhaust brake and engine brake functioning, because they both obtain the same result_reduce speed.
Keep asking questions, I gotta get another blue campfire before I time out.
Congratulations on your new truck!
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