Free 7 Day Trial RV GPS App RV Trip Planner Campground Reviews RV Maintenance Free 7 Day Trial ×
RV Trip Planning Discussions

Go Back   iRV2 Forums > THE OWNER'S CORNER FORUMS > Newmar Owner's Forum
Click Here to Login
Join iRV2 Today

Mission Statement: Supporting thoughtful exchange of knowledge, values and experience among RV enthusiasts.
  This discussion is proudly sponsored by:
Please support our sponsors and let them know you heard about their products on iRV2
Thread Tools Search this Thread Display Modes
Old 06-12-2021, 12:54 PM   #1
tomato's Avatar
Join Date: May 2021
Posts: 50
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.
tomato is offline   Reply With Quote
Join the #1 RV Forum Today - It's Totally Free! RV Community - Are you about to start a new improvement on your RV or need some help with some maintenance? Do you need advice on what products to buy? Or maybe you can give others some advice? No matter where you fit in you'll find that iRV2 is a great community to join. Best of all it's totally FREE!

You are currently viewing our boards as a guest so you have limited access to our community. Please take the time to register and you will gain a lot of great new features including; the ability to participate in discussions, network with other RV owners, see fewer ads, upload photographs, create an RV blog, send private messages and so much, much more!

Old 06-12-2021, 03:12 PM   #2
Senior Member
lass's Avatar
Join Date: Sep 2012
Location: Tarpon Springs, Fl.
Posts: 1,429
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.
2013 Newmar Ventana 3434
2018 Wrangler JLU Rubicon
lass is offline   Reply With Quote
Old 06-12-2021, 04:14 PM   #3
"Formerly Diplomat Don"
Dutch Star Don's Avatar
Newmar Owners Club
Join Date: Apr 2005
Location: Moorpark, Ca.
Posts: 18,227
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.
Don & Mary
2019 Newmar Dutch Star 4018 (Freightliner)
2019 Ford Raptor
Dutch Star Don is offline   Reply With Quote
Old 06-13-2021, 03:41 PM   #4
Senior Member
Join Date: Oct 2016
Posts: 190
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.
Ed Headington is offline   Reply With Quote
Old 06-13-2021, 03:49 PM   #5
Senior Member
Join Date: Oct 2014
Posts: 2,990
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.
Brett Wolfe
Ex: 2003 Alpine 38FDDS. Ex: 1997 Safari Sahara. Ex: 1993 Foretravel U240
wolfe10 is offline   Reply With Quote
Old 06-14-2021, 08:12 PM   #6
mtflybox's Avatar
Newmar Owners Club
Freightliner Owners Club
RV Trip Wizard
Join Date: Jan 2021
Location: St. Augustine, FL
Posts: 72
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.
2021 Newmar NewAire 3341/Blue Ox Avail
2018 F-150 Platinum/2019 Wrangler/STAY-IN-PLAY DUO
mtflybox is offline   Reply With Quote
Old 06-15-2021, 04:35 AM   #7
Senior Member
Newmar Owners Club
Join Date: May 2020
Location: Fort Lauderdale, Fl
Posts: 100
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.
2022 Dutch Star 4369 - hoping Nov Dec delivery!?
2020 Kountry Star 3709 towing 2016 Equinox
2016 Airstream Interstate Grand Tour
RVStitchy is online now   Reply With Quote
Old 06-15-2021, 08:52 AM   #8
tomato's Avatar
Join Date: May 2021
Posts: 50
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.
tomato is offline   Reply With Quote

cummins, power

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

Similar Threads
Thread Thread Starter Forum Replies Last Post
Cummins 360 HP/ 800 torque Robert T Cummins Engines 12 12-17-2020 08:35 AM
To tow with an Allegra red 360 hp 800 pound torque Joyridedale Toads and Motorhome Related Towing 11 10-27-2017 08:37 PM
ISB 6.7 360/800 Mods? bkervaski Cummins Engines 4 05-06-2016 10:31 PM
Cruise Control, Safari Ivory, 8.3 liter Cummins Turbo Diesel pilgrim0137 Cummins Engines 15 10-03-2011 11:41 PM
New version of the RV 360 Vent Cap: the 360 Siphon Richard 34A Winnebago Industries Owner's Forum 4 07-05-2008 12:49 AM

All times are GMT -6. The time now is 03:45 PM.

Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2021, vBulletin Solutions, Inc.