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Old 01-20-2013, 09:05 AM   #1
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what rpm @70MPH on C9

what rpm @70MPH running down the big road in a 40" country coach with the C9 cat engine? thanks
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Old 01-20-2013, 12:51 PM   #2
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Do you know your , rear end ratio and tire size, trans model ( I'm assuming Allison 4000 ) and coach year. Trans may have different Over drive ratio from one year to the next.
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Old 01-20-2013, 01:09 PM   #3
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If you have Silverleaf, the RPM that shows there is correct. That info is taken directly from the ECM
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Old 01-20-2013, 01:26 PM   #4
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Don , as Ron is asking about a coach that differs from his signature, I assumed that he is asking about a unit he is considering for purchase and has not driven. A lot of variables unless someone with the exact same unit answers the post.
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Old 01-20-2013, 09:31 PM   #5
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Don , as Ron is asking about a coach that differs from his signature, I assumed that he is asking about a unit he is considering for purchase and has not driven. A lot of variables unless someone with the exact same unit answers the post.
True. Also the C9 could be a 400HP or a 425HP. That would make the transmission either a 3000 or 4000 series depending on torque rating.

I would assume that he would be driving the coach before purchase and therefore be able to get info from the Silverleaf.
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Old 01-21-2013, 06:49 AM   #6
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Yep, I wanting a Country Coach owner to tell me what RPM he is running say at 70mph.
I have my eye on a few coaches some with cummins and some with cat.
I am very tired of driving my 208" wheelbase out west.
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Old 01-21-2013, 11:27 PM   #7
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Well, for kicks, today I ran mine up to 65 and checked the RPM. I was showing 1650 on the Silverleaf. I have a ISC 350/
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Old 01-21-2013, 11:43 PM   #8
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Well, for kicks, today I ran mine up to 65 and checked the RPM. I was showing 1650 on the Silverleaf. I have a ISC 350/
Well, it doesn't answer the OP's question about a C-9 but ours is about the same as above with our ISC 350. Our Banks kit makes no difference in the rpm/mph equation.
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Old 01-28-2013, 11:37 AM   #9
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It depends on the model and year. I calulated values for 2009 models:
Allure, 40 ft, C9 engine: 1773 rpm at 70 mph
Tribute or Inspire, C9 engine: 1862 rpm at 70 mph

Looking back at the specs for the 2005 Allure, they are similar to the 2009 Inspire. This is known as model creep so if you want exact numbers you need to crunch them for the specific model, year and options.

If you know the tire "revs per mile", rear end ratio, and transmission final (6th gear) drive ratio (.65 for both the CAT CX28 and the Allision 3000 transmissions and assuming torque converter lockup at that speed),
you can do your own calculations using:
Speed Calculator
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