Turbo Boost Curiosity
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More Turbo
Joined: Feb 2005
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From: Graham, WA
Turbo Boost Curiosity
While engine braking on long down hill runs I notice about 3-4 lbs of boost when I exceed 3K RPM. Why would I have any boost? Should I be concerned? It's been that way for as long as I can remember.
Rob
Rob
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Joined: Apr 2013
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From: NH
Without the exhaust brake, I think the air pump affect of the engine can accelerate the turbo slightly. There's no real boost because no fuel is being applied.
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Joined: Oct 2013
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From: NC
Is there some trick to utilizing the exhaust brake? I turned it on once when I was coming down a mountain to see if it did anything but I didn't have a trailer hooked up. Nothing changed that I could tell. Do you have to have a trailer connected?
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Joined: Apr 2013
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From: NH
What you DO need are RPMs. With the exhaust brake on, and coming down a hill at speed, use the +/- buttons on the shifter to drop from 6th down to 5th or 4th gear. You'll immediately see the turbo gauge register boost, and the truck will slow down easily without brakes.
Alternately, you can engage Tow / Haul mode with the exhaust brake on, and simply apply the brakes until the truck automatically downshifts...but I like manually dropping a gear or two myself.
The 2017 trucks now offer an 'auto mode' for the exhaust brake. If engaged, it remembers your speed when you let off the gas. If speed continues to increase, it will drop a gear or two in order for the exhaust brake to function.
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Joined: Apr 2016
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I think it's more of the weight of the trailer your pulling is why you notice it braking with a trailer vs not having a trailer. I could be wrong and I'm sure there's a much more logical and detailed explanation than mine but just from driving and using it vs not using it in different scenarios I can tell you having a fully loaded trailer behind you going down a nice grade your going be glad it's there
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Joined: Apr 2013
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From: NH
I promise you will notice it on a steep downhill even empty and not towing.
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Joined: Apr 2016
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Oh I believe you. I was just getting ready to say thanks for posting your earlier answer because I didn't realize that it had everything to do with downshifting and that it didn't matter whether you were full or empty. Learn something new everyday. Thanks
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Joined: Oct 2013
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From: NC
What you DO need are RPMs. With the exhaust brake on, and coming down a hill at speed, use the +/- buttons on the shifter to drop from 6th down to 5th or 4th gear. You'll immediately see the turbo gauge register boost, and the truck will slow down easily without brakes.
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Joined: Apr 2013
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From: NH
With it on, you will see significant boost registered on the gauge. You will also feel a lot more braking and hear the turbo brake.
Lead Driver
Joined: Dec 2013
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I use the EB and Tow/Haul when going down some steep roads here in AK and I am no tloaded. It makes a difference and keeps my foot off the brake... Usually these are long 7%-10% grades according to the truck gauge. I noticed that a lot of roads here won't say the % grade unless it's 10% or higher.
I will just use the EB if the road is icy as I am scared a rough downshift would be bad on ice.
I will just use the EB if the road is icy as I am scared a rough downshift would be bad on ice.
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