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07-02-2020, 01:24 PM
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#1
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Junior Member
Country Coach Owners Club
Join Date: Mar 2019
Posts: 4
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05 Allure with Cat C9 low power on hills
My 05 Allure 470 cruises great on flat ground but 6% grade in 4th gear at 1800 rpm I can only go 40 mph. Wondering how other coaches do.
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07-02-2020, 02:19 PM
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#2
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Community Moderator
Newmar Owners Club
Join Date: Feb 2011
Location: Point Pleasant Beach, NJ
Posts: 31,553
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My last MH was a 43' Dutch Star with a C-9. 6-7 degree grades I had the same issues that you are having. Granted I was longer and heavier but I never had any problems on flat ground either.
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Tony & Ruth........... FMCA#F416727
2016 London Aire 4519, Freightliner chassis, Cummins ISX, 2018 Jeep Wrangler Unlimited, Blue Ox Avail with AF1. TST 507 TPMS
No amount of money can buy you an extra second of time.
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07-02-2020, 07:21 PM
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#3
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Senior Member
Country Coach Owners Club
Join Date: Jan 2006
Location: Northern California
Posts: 5,868
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Quote:
Originally Posted by Hersch
My 05 Allure 470 cruises great on flat ground but 6% grade in 4th gear at 1800 rpm I can only go 40 mph. Wondering how other coaches do.
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35 mph but always reach the top....
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Dean
1995 38' CC Magna #5280 **** Sold after 21 years of enjoyment.
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07-03-2020, 01:41 PM
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#4
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Senior Member
Join Date: Jan 2018
Location: Traveling
Posts: 553
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My Cummins ISL was having hill climbing problems until I replaced my CAC. Turned out it was leaking and reducing boost. I didn't notice the problem on flat or gently sloping roads.
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-Dave
2003 Country Coach Allure First Avenue 36; 2012 Honda CR-V
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07-03-2020, 08:00 PM
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#5
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Senior Member
Join Date: Nov 2009
Location: Warren, Oregon
Posts: 2,560
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Quote:
Originally Posted by Hersch
My 05 Allure 470 cruises great on flat ground but 6% grade in 4th gear at 1800 rpm I can only go 40 mph. Wondering how other coaches do.
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Do you have any gauges like Scangauge D or Silverleaf that reads boost pressure. If you have low boost that will slow you down, remember you don't have a C-13 or C-15. To me it sound about right.
2 stroker
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2006 Country Coach Inspire 360 40ft Genoa Designer Series, Samsung 197 RR
Cat C9--STEEL & COPPER Bolt Together Radiator w/ updated rubber mounting
SilverLeaf 330 Magnum 2812 PSW 2011 Ford Edge Sport-Air Force One
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07-03-2020, 08:35 PM
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#6
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Senior Member
Country Coach Owners Club
Join Date: Dec 2010
Posts: 7,803
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That sounds about right. Are you towing anything up that hill?
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Don
2002 Country Coach Intrigue
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07-04-2020, 07:14 AM
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#7
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Junior Member
Country Coach Owners Club
Join Date: Mar 2019
Posts: 4
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Cat C9 low power on hills
Thank you for the responses. I have had the CAC checked and there was a hole in the hose. This did improve performance some. Doesn't seem to matter much whether I'M towing or not. I have a Bluefire dongle it is showing 28 lbs of boost under load.
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07-04-2020, 08:13 PM
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#8
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Senior Member
Fleetwood Owners Club American Coach Owners Club Spartan Chassis
Join Date: Oct 2009
Location: Fort Pierce, FL
Posts: 1,025
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28 sounds mostly okay. My C9 will show 31 once in awhile. It goes up better than yours but I’m only 40 ft pulling a car.
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 Revolution LE 38X C9 Cat
2020 Jeep Gladiator Toad
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07-05-2020, 09:48 PM
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#9
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Member
Join Date: Dec 2017
Posts: 79
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You are doing fine. The Cat manual says to manually downshift before starting the climb and keep downshifting to keep the rpm up. I always stay above 2000 rpm and it never gets warm. I figure I’m over 50,000 pounds towing my Denali 2500HD and don’t expect over 35-40 mph with 425 hp.
I am still able to pass most semis that are at 80,000 pounds with 450-500hp.
Enjoy the ride,
Dan
__________________
2008 43' Country Coach Founders Edition towing 2019 Sierra Denali HD.
Summer Pasco, WA
Winter, Motorcoach Country Club, Indio, CA.
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07-06-2020, 12:32 PM
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#10
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Senior Member
Join Date: Oct 2016
Posts: 226
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Power
My 40’ CC will pull Grapevine @ 55 pulling Jeep.....unless I get slowed down,then it’s hard to pick back up.
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2008 Country Coach Allure 470
Cummins 425 ISL; Stay-in-Play Duo
'17 Jeep Grand Cherokee Overland
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