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there is ZERO chance that ANY gasser pickup has anywhere near the holding power of a comparable diesel with a good exhaust brake.

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Pretending a gaz engine descends the mountain as well as a diesel is
misleading.

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It's always the same issue on a clear sunny day in light traffic everything is always fine.
But on a rainy, windy, day in heavy traffic or whenever conditions are not ideal having the optimum equipment makes a difference.

The 2005 Duramax did not have a factory exhaust brake.
Compare that 05 Duramax or that 8.1 to a a modern diesel with a OEM exhaust brake and you will find there is a significant difference in slowing power going down the grade.

JRscooby wrote:

The only reason I can see for EB not to increase the whoa, would be stopping air from going in works nearly as well as stopping it from coming out.

wnjj wrote:



It’s not just about stopping air movement. It’s all about PSI exerted on the pistons. The most a throttled engine can do is a perfect vacuum which puts < 15 psi against the back of the pistons. An exhaust brake can compress to more than 4x that psi so much more force on the pistons and more stopping power.

Think of the difference in energy required to run a vacuum cleaner versus an air compressor.

blt2ski wrote:


I still believe for most interstate driving, a gas rig appropriately loaded, with current technology, will be fine into the low 20k realm.
The only thing a diesel will have generally speaking, is power at 10k feet vs the gas bring 30% down to to elevation. As I don't know if any diesels with out a turbo. With the advent of the eco boost style engines, elevation power loss will not be an issue.

Marty

Marty

JRscooby wrote:





So the gods have spoken! No need to run any side by each comparison, because it is true.
I'm not prepared to say it is not true, but I question that it is*



These 2 ideas kinda show 1 comparison nobody makes. If the parts that give a gas engine it's ability to slow the vehicle fail, it likely will not start. If it did start, be near impossible to drive with constant WFO.
OTOH, what happens when you are dropping down a grade, discover the control circuit to exhaust brake died?
My buzzin dozen sold in a '67 Pete had exhaust brake on each bank, from factory. But they did not become common until they started selling diesel powered pickups. Was that because a gas engine was better at whoaing the load than diesel that did not have one? I know that as soon as they installed them they started to advertise how great they are.
*Now as to why I question there would be a great difference when compared like sized engine/gears/loads. There is no doubt at all adding exhaust brake makes a huge difference on the diesel. And I have retrofitted EB in a gravel parking lot, so factory engineers could do it in their sleep. The fact that manufactures are not installing, and advertising "We have exhaust brake" implies there would be no gain to installing one on gas engine. The only reason I can see for EB not to increase the whoa, would be stopping air from going in works nearly as well as stopping it from coming out.

blt2ski wrote:

Isuzu LCF models has exhaust brakes std in early 80's. Those rigs needed them for steeper than 10% grades. Less than 6% freeway grades were not a big deal. Granted most of those driven were at gvwr, not gcw. As they went the most powerful creatures.
My 05 dmax, the grade braking of the Allison worked fine when I was in the greater than 15-20k gvwr realm. Freeway weren't a big deal. Greater than local 10% grades, needed the trans grade braking plus an occasional use of truck and trailer brakes.
I will say, exhaust brakes are good to have on diesels. The rigs I have driven with exhaust brakes, behaved as they should. As the engines as designed do not have the best potential compression braking vs gas rig. I believe Scooby pointed out the why.
I still believe for most interstate driving, a gas rig appropriately loaded, with current technology, will be fine into the low 20k realm.
The only thing a diesel will have generally speaking, is power at 10k feet vs the gas bring 30% down to to elevation. As I don't know if any diesels with out a turbo. With the advent of the eco boost style engines, elevation power loss will not be an issue.

Marty

Marty

Me Again wrote:



Yeah, I drove a couple tradesman's before buying the Laramie. And the seats were like setting on an apple crate! Short term go get seats out of a higher trim level. Our Laramie had bucket seats with the full center console and we loved it for traveling back and forth between Wa and Az. 2015 to 2021.

Now a tidbit #1 rule from "me Again", go into retirement with paid off newer vehicles, RVs and other toys.

Grit dog wrote:



Scooby, I know you’re a lifelong truck driver so I try to keep that in mind, but what on earth does a story about a 67 Pete and a bunch of cab lizard lingo have to do with the OPs topic? Besides hearing yourself reminiscing about the past?