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11-21-2021, 09:16 PM
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#1
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Senior Member
Join Date: Aug 2001
Location: North America somewhere
Posts: 25,094
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Allison 3000, how and why it works
The functions of the Allison mode button:
and many more Alison videos.
__________________
2000 Winnebago Ultimate Freedom USQ40JD , ISC 8.3 Cummins 350, Spartan MM Chassis. USA IN 1SG 11B5MX,Infantry retired;Good Sam Life member,FMCA. " My fellow Americans, ask not what your country can do for you, ask what you can do for your country. John F. Kennedy
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11-28-2021, 08:20 AM
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#2
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Senior Member
Fleetwood Owners Club American Coach Owners Club
Join Date: Mar 2011
Posts: 6,277
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Very interesting, thanks for posting. I often marvel that all this complex motor home stuff manages to work....most of the time. 
__________________
2014 American Eagle 45T
DD 13, 500 HP
Pulling a Honda CRV
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12-09-2021, 06:43 AM
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#3
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Senior Member
Join Date: Aug 2015
Posts: 808
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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.
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12-15-2021, 06:40 PM
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#4
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Senior Member
Join Date: Aug 2001
Location: North America somewhere
Posts: 25,094
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Quote:
Originally Posted by Wild Card
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.
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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)
__________________
2000 Winnebago Ultimate Freedom USQ40JD , ISC 8.3 Cummins 350, Spartan MM Chassis. USA IN 1SG 11B5MX,Infantry retired;Good Sam Life member,FMCA. " My fellow Americans, ask not what your country can do for you, ask what you can do for your country. John F. Kennedy
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12-16-2021, 12:08 PM
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#5
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Senior Member
Join Date: Aug 2015
Posts: 808
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Quote:
Originally Posted by Ray,IN
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)
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I don't think so partner, but you do you.
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01-26-2022, 06:08 PM
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#6
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Senior Member
Join Date: Aug 2021
Location: Scottsdale, Az
Posts: 140
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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.
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01-26-2022, 06:26 PM
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#7
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Senior Member
Holiday Rambler Owners Club
Join Date: Aug 2010
Posts: 8,695
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Quote:
Originally Posted by Wild Card
I don't think so partner, but you do you.
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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!
__________________
Ben & Sharon
2008 43' Holiday Rambler Scepter PDQ
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