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-   -   Allison 3000, how and why it works (https://www.irv2.com/forums/f125/allison-3000-how-and-why-it-works-562305.html)

Ray,IN 11-21-2021 09:16 PM

Allison 3000, how and why it works
 
https://www.youtube.com/watch?v=PLS-x0Lazz8


The functions of the Allison mode button: https://www.youtube.com/watch?v=KsMOtgh3k6k
and many more Alison videos.

Cat320 11-28-2021 08:20 AM

Very interesting, thanks for posting. I often marvel that all this complex motor home stuff manages to work....most of the time.:D

Wild Card 12-09-2021 06:43 AM

unfortunately in todays world of efficiency and emissions reduction the programs are not in the best interest of engine longevity.

in the mode/performance video they keep saying the most efficient state of the engine is low rpm high throttle operation. Well that's all good and well and they beat that in to the un knowing peoples heads. High boost, low RPM and peak torque create a lot of heat, this also is just at the lugging point of the engine and will stat beating up the engine liners. Its absolute BS and is not the way a commercial engine should be run. A hill should be pulled closer to peak HP not torque.

Ray,IN 12-15-2021 06:40 PM

Quote:

Originally Posted by Wild Card (Post 6011429)
unfortunately in todays world of efficiency and emissions reduction the programs are not in the best interest of engine longevity.

in the mode/performance video they keep saying the most efficient state of the engine is low rpm high throttle operation. Well that's all good and well and they beat that in to the un knowing peoples heads. High boost, low RPM and peak torque create a lot of heat, this also is just at the lugging point of the engine and will stat beating up the engine liners. Its absolute BS and is not the way a commercial engine should be run. A hill should be pulled closer to peak HP not torque.

i am sorry you are so misinformed. An Allison transmission will never allow a diesel engine to "LUG", it will downshift when the engine RPM begins to fall below peak torque to raise RPM.
Anyone who experiences overheating is IMO neglecting normal maintenance. My MH has never overheated pulling any grade in economy mode.
Talk with any experienced OTR truck driver, they get into the highest gear possible to pull the load ASAP.(although that is a manual tranny)

Wild Card 12-16-2021 12:08 PM

Quote:

Originally Posted by Ray,IN (Post 6018418)
i am sorry you are so misinformed. An Allison transmission will never allow a diesel engine to "LUG", it will downshift when the engine RPM begins to fall below peak torque to raise RPM.
Anyone who experiences overheating is IMO neglecting normal maintenance. My MH has never overheated pulling any grade in economy mode.
Talk with any experienced OTR truck driver, they get into the highest gear possible to pull the load ASAP.(although that is a manual tranny)


I don't think so partner, but you do you.

RonAz 01-26-2022 06:08 PM

You don't have to have the coolant temp rise to a high level to overheat a diesel, nor do you have to be at the bottom of the rpm range to be lugging it. With the lack of gauges in a MH you are at the mercy of the computers to protect everything. They are built to be put in D and go so as to not scare off buyers.

96 Wideglide 01-26-2022 06:26 PM

Quote:

Originally Posted by Wild Card (Post 6019035)
I don't think so partner, but you do you.

I'm with you!

The Allison trans will allow the engine get very close to lugging before downshifting.
I prefer to keep the RPM's up myself!


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