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Old 06-12-2021, 12:54 PM   #1
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Cummins B 6.7 Liter 360 / 800 Power

Our Ventana 3412 should be here soon! Quick question. For those with the 6.7 liter Cummins rated at 360HP and 800Lb/Ft. How do you rate the power, especially when driving mountain roads? With and without a Toad?

This is our first MH, and my only comparison is our 5er and Duramax TV. 445HP with 910 Lb/Ft pulls a combined weight of 26K beautifully. I have yet to find a grade that I cannot easily accelerate up (if I choose).

I figure the Ventana will be about 34,500 without a Toad and 38,500 with. That is a lot more weight than I am running now and quite a bit less power.

Appreciate the input. Hoping my concerns are unfounded, as I have never had a Cummins straight 6.
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Old 06-12-2021, 03:12 PM   #2
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Cummins B 6.7 Liter 360 / 800 Power

I have a 2013 Ventana 3434 with the 360 HP Cummins and my weight is not near your estimates. Just had mine weighed and with a JLUR towing, Iím at about 34000 lbs. loaded for a 6 week trip and a full tank of fuel.

That said, last week I did Wolfs Pass in Colorado and maintained a steady 35 MPH uphill. On the down side, the EB held its own all the way.
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Old 06-12-2021, 04:14 PM   #3
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Many manufactures try to keep the weight ratio at 10 HP per 1000 pounds. You'll be close to that. However, you're not going to a be a rocket to the top of the grade. I had a 450HP/1250Torque engine moving 34K and I could climb any grade out west at 55+ mph. Fast forward to my two Dutch Stars, one weighing 45K towing and the other weighing 48K towing, both with the 450HP/1250torque engine and we do about 40mph to 45 mph on steep 6% - 7% grades.

I've just gotten use to it, realizing it's usually just 5 minutes of your driving day. I proactively shift the Allison, something you should experiment with as you get more comfortable with the coach. Try noting at what speeds it downshifts from gear to gear on grades. This will allow you to later shift manually when you near those speeds.
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Old 06-13-2021, 03:41 PM   #4
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We have a 2013 Ventana LE 3434. It has the 340 hp 6.7 liter Cummins. When fully loaded and our 2018 Corolla connected, our weight is about 30,000 pounds. I have been very pleased with its performance over mountain passes. Although it has less torque than our previous 33,000 pound motorhome with a 400 hp 9 liter CAT engine, it does as well on the hills as the CAT did. I believe that is because although the torque is quite a bit less, the 6.7 liter engine is governed at 2700 rpm instead of 2200. As a result I can climb a hill at 60 mph in 4th gear, which I could not do with the CAT because of the lower governed speed.
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Old 06-13-2021, 03:49 PM   #5
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Guess I my benchmarks are different.


Our 1993 Foretravel 36' had 250 HP/650 lb-ft torque.



Sold it with over 170,000 miles all over North America. On OUTRAGEOUS mountains in the U.S, Mexico and Canada.


Never a issue with power. Were we the first to the top of the grade? No.


Was that important to us. No.


YOU have do decide what is important to YOU.
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Old 06-14-2021, 08:12 PM   #6
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What Don said....

You wont be in the fast lane up or down. Practice with your transmission, watching rpm and transmission temp.

Even with the Super C we just traded out of, for the major grades in VA or PA with big grades for example, 35 mph max. Don't get stuck behind the slow dude on the right cause you can't make it up.

I've seen more of the mountains going slow for what its worth.
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Old 06-15-2021, 04:35 AM   #7
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2020 Kountry Star 3709 at about 34,000 lbs. Just finished our first trip to the mountains (Mountain Falls in Lake Toxaway NC). Had a few grades and moments where we were on a steady climb at 35 mph at WOT. Same as some of the trucks around us. Felt perfectly normal to me.
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Old 06-15-2021, 08:52 AM   #8
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Appreciate all the responses. It is definitely a concern, as we spend a lot of time in and traversing the Sierras. 8%+ grades are pretty common, but the steeper grades are usually twisty and prevent you from going much faster anyway.
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