bjw1
Sacramento, CA
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Joined: 04/23/2002
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I do use the VMSPC so I should be able to really see the REAL difference on the next trip.
Does anyone know where I can post the spreadsheet so others can download it? Some of you other spreadsheet guys might want to improve it some. I was going to add a few features, but I had better things to do (read that, my wife had better things for me to do).
One of my motivations was to show some non-forum types that are complaining about the price of fuel and how the oil companies are screwing us that if they just slow down, it could be the equivalent of lowering the price of fuel significantly. If you're disgusted with the oil companies obscene profits, the best way to get even is to slow down. I figured the best way to get even was to own their stock, so I kind of like the obscene profits (and my future retirement may be partially funded by those obscene profits, but that's another story).
Bryan
2001 Monaco Diplomat 36D
2002 Jeep Liberty Toad
2005 Dodge 2500 CTD A/T Quadcab shortbed 4X4
2005 Lance 815
(2) Kawasaki Prarie 360 4X4 ATV's
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apr67
Tallahassee, Florida
Senior Member
Joined: 02/14/2007
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About how much was the VMSPC?
Don't take your organs to heaven. Heaven knows we need them here.
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2007 National Surf Side 34DE. Full timing since 1/06/08
2007 Toyota Matrix Da Toad
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Richard Pelletier
Chesapeake, VA, USA
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Joined: 03/21/2002
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The VMSpc program is a free download. You can play around with it. You will need a box and cable to connect your coach to your laptop. I think is is around $375. Go to my last post on this subject for their site.
2005 40 ft Monco Knight PLQ 4 slides
2002 2500HD Crew Cab 8'bed 4X4
Duramax/Allison (A BIG TOAD)
Richard and Susan
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Cousin_Eddy
Peoria, AZ
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Joined: 01/23/2006
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Where did you download the base spreadsheet from?
1995 33' Southwind Fleetwood Model LW
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KOG
Winterville GA
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Joined: 01/31/2001
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Diesels have fairly similar specific fuel consumption over a wide range of load, gas engines are best at torque peak rpm and about 70% of full load, drop off rather badly above and below that. Bottom line: a mpg calculator based on power consumption is utterly useless.
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chuck4788
West of the Middle
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Joined: 05/10/2006
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A prior thread had a downloadable spread sheet that calculates engine HP required for roadspeed and grades. The author adjusted the factors to align its results with data in the Cat RV whitepaper Understanding RV Performance If I can find the original thread I'll post the link.
For all of you gearheads with extra time check out this GM document for calculating Truck Performance . Just select values that match your MH.
Chuck
02 Beaver
505hp C12 Cat
Trailblazer toad
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Daveinet
il
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Joined: 10/29/2003
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Chuck, an interesting Gm doc. Surprised that they show the power loss for diesel to be greater at high altitude than for gas. I've always heard it the other way around.
Dave
FMCA F298817
'83 Revcon Prince 31' FWD
502 w/Thorley's & Magnaflows,
Howell/Edelbrock MPFI, Koni FSD,
Class A built for gear heads 
My Revcon Website
Revconeers Forum
XP activation frustration
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sepisllib
Cresco, Iowa
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Joined: 12/05/2004
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Deen wrote:If I drop much below 60 mph my trans shifts down on every little rise unless I use "Economy" mode, even then it's a pain. 60-62 seems to be about as low as I can go and still have momentum to get up hills.
Likewise - and I asked the Allison shop to reprogram mine lower and they advised that they cannot do it.
God Bless
Bill
Bill W. Trammell
Wife - Judy
2001 Monaco Dynasty Chancellor
2008 Malibu 2LT toad
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wolfe10
Texas
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Joined: 10/08/2000
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sepisllib wrote: Likewise - and I asked the Allison shop to reprogram mine lower and they advised that they cannot do it.
Bill
It can easily be reprogrammed-- I had mine done. The change affects all shifts, not individual gear shifts-- basically you are telling the transmission that the max engine RPM is lower than is currently programmed.
But is should not be done if it would cause up-shifts that would allow engine operation at or close to WOT below peak torque RPM. If ALL your shifts put lowest RPM in all gears more than 100 RPM above peak torque RPM, you can consider reprogramming. But if you can currently operate in any gear at, say, 80% throttle within 100 RPM of peak torque RPM, you are not a candidate for reprogram.
Brett Wolfe
1993 Foretravel 36' U-240
Cat 3116, Allison 3060
Caterpillar RV Engine Owner's Club: www.catrvclub.org
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