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Old 10-28-2020, 10:15 PM   #1
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450 hp Anthem climbing ability

Hello,
I am looking at purchasing an anthem with the 8.9 L Cummins 450 hp and was wondering when loaded near capacity and pulling a 5000 pound Vehicle what speed are you able to maintain climbing a 6% grade?

Thank you in advance for your support.

Ssor
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Old 10-28-2020, 11:04 PM   #2
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I think this is a good question and I’ve asked similar ones, but what I’ve found is results can vary widely due to differing driver skills and habits.

I’ve decided that the best way to make these comparisons is to look the ratio between hp and torque, and unladen weight and/or GVWR, and ensure that gearing in your sample is the same. Given that info, you can get a pretty good idea of how one coach will perform compared to another without driver variables.

As an example, I’ve read on this forum that the 8.9 equipped 35’ New Aire is both “a rocket” and “sluggish“. Makes it hard to form an opinion based on the experiences of others.

Peoples experiences here are quite valuable in many ways, but you would have to qualify the question to account for variables such as those that drive with the cruise control, those that don’t but leave it in drive, those that take over shifting on hills, the two common trans modes and how they are used, those that power up for hills, and those that just ride the torque curve, what rpm range the driver prefers, etc.

Oh, and welcome to the forum - a wealth of knowledge and experience awaits
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Old 10-28-2020, 11:45 PM   #3
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I've never paid attention to my speed because it isnt important to me. There are a few long 6Č grades here in the NW and I just find a comfortable RPM and keep it there. I can tell you that I pass a lot of truckers and sometimes get passed by other truckers. And everytime I get to the top.
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Old 10-29-2020, 04:35 AM   #4
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While I can’t answer your question specifically, I can say that I find the 450 adequate. I always thought I had to have a 600/605 until we took a cross country trip 2 years ago. We traveled Colorado, Montana, Idaho, Wyoming etc. The only hill I had trouble with was a 10% grade. All others I was able to make at 50 mph or better. At the time we towed a Jeep Cherokee at about 4500 lbs and a bike on a lift at around 1000 lbs. We recently bought our second Entegra and third MH with the 450.
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Old 10-29-2020, 04:41 AM   #5
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Iíve been traveling around the northeast for the past few months and I can tell you mine feels sluggish at steep inclines whether towing my Jeep or not. If Iím up to a decent speed before incline obviously that helps some but I have not been happy with the performance climbing hills. I know some it does not bother but I donít enjoy a 35 mph speed climbing hills. I spoke to a gentleman who works on these units and he told me theyíre governed to eliminate any potential damage. Not sure how true this is but Iím sure someone with more knowledge will chime in. Love my Anthem but already considering a cornerstone in the future. Just my opinion as a current owner so I hope it helps.
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Old 10-29-2020, 07:03 AM   #6
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Traveling through Va mountains on 81 with my Anthem, towing my Cherokee I was topping off at 55. The CS 605 easily maintained 65 on the way home
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Old 10-29-2020, 07:45 AM   #7
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35 to 55 mph depending on how long the grade is and truck traffic.
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Old 10-29-2020, 08:29 AM   #8
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I have gone over the I70 pass in Colorado a number of times and my speed is similar to the trucks on the road. For $100,000 more (on a new coach) you can pass all of those trucks.
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Old 10-29-2020, 08:51 AM   #9
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Iíve owned both and while we now have a cornerstone I certainly wouldnít pay $100,000 more just to have a 605 verses the 450. I think if you put them side by side the 605 would probably top a hill 10-15 mph faster than the 450. Having said that Iíve been on a couple of hills where the 605 is down to 35-40 mph. I like the X15 ď605Ē but 90% of the time the 450 will run with it all day.
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Old 10-29-2020, 09:29 AM   #10
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Quote:
Originally Posted by Rollin101 View Post
Iíve owned both and while we now have a cornerstone I certainly wouldnít pay $100,000 more just to have a 605 verses the 450. I think if you put them side by side the 605 would probably top a hill 10-15 mph faster than the 450. Having said that Iíve been on a couple of hills where the 605 is down to 35-40 mph. I like the X15 ď605Ē but 90% of the time the 450 will run with it all day.
Have to agree 100%. I have owned both. We upgraded to the Cornerstone for the ride and creature comforts, not so much the larger engine. The 450 did just fine on power. Before the 450 I had a 350 Cummins, that one needed help.
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Old 10-29-2020, 11:58 AM   #11
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I have a 2019 Anthem with the 405, pulling a 2015 Jeep Grand Cherokee. We are pretty close to max on weights. As long as I can carry momentum into the climb we stay around the 50-55 mph mark, forget about building speed on the hill. If for some reason you loose the momentum well you can hang out with the trucks in the slow lane at 35-40 mph. All of this on 6-10% grades in Colorado and NM. Personally if I had 50 HP and about another 100-200 ft lbs or torque I would be great. To get that I have to pay 100 k and I get bonus levels of both!! Most days I just smile and take it easy over the passes and enjoy the ride.

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Old 10-29-2020, 12:13 PM   #12
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The physics:


https://www.rvtechlibrary.com/engine...erformance.pdf


Page 5.


Assuming 6% grade, 400 rear wheel HP and 40,000 GCW= just under 50 MPH. This will put you WELL faster than the loaded 18 wheelers.


Yes, written for/by Caterpillar, but physics is the same for Cummins!
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Old 10-29-2020, 04:30 PM   #13
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Quote:
Originally Posted by SSOR View Post
Hello,

I am looking at purchasing an anthem with the 8.9 L Cummins 450 hp and was wondering when loaded near capacity and pulling a 5000 pound Vehicle what speed are you able to maintain climbing a 6% grade?



Thank you in advance for your support.



Ssor


If you are in that big of a hurry you should buy a 605 ho Cornerstone.

Joe
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Old 10-30-2020, 07:02 AM   #14
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Quote:
Originally Posted by wolfe10 View Post
The physics:


https://www.rvtechlibrary.com/engine...erformance.pdf


Page 5.


Assuming 6% grade, 400 rear wheel HP and 40,000 GCW= just under 50 MPH. This will put you WELL faster than the loaded 18 wheelers.


Yes, written for/by Caterpillar, but physics is the same for Cummins!
I really like that PDF. I may have to keep it around for the two times a week this topic comes up.

It's worth mentioning that as long as your coach has the very-standard 1hp per 100lbs ratio, you can simply use Cat's top-line numbers regardless of how much power you have or how much your coach weighs. Wind and rolling resistance will be essentially the same, and what Cat calls "grade resistance" is linearly proportional to vehicle weight.
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