Trailer Life Magazine Open Roads Forum: 275 HP Cummins diesel on a 31' coach
Open Roads Forum Already a member? Login here.   If not, Register Today!  |  Help

Newest  |  Active  |  Popular  |  RVing FAQ Forum Rules  |  Forum Posting Help and Support  |  Contact  

Search:   Advanced Search

Search only in Class A Motorhomes

Open Roads Forum  >  Class A Motorhomes  >  All

 > 275 HP Cummins diesel on a 31' coach

Reply to Topic  |  Subscribe  |  Print Topic  |  Post New Topic  | 
Page of 4  
Next
Sponsored By:
dmatt

Ventura County, CA

Senior Member

Joined: 07/29/2003

View Profile



Good Sam RV Club Member

Offline
Posted: 09/26/18 11:13am Link  |  Quote  |  Print  |  Notify Moderator

Ok, so our search for the next RV is ongoing and I have expanded it to included the smaller sized DP coaches. Tiffin has a 31' Breeze that has a 275 HP Cummins diesel that produces torque of 560 at 1600 RPM.

That is less HP than the V10 Ford gasser, but more torque.

So, my question is.....will I feel underpowered driving a 31' coach with a GVWR of 24500 pulling a 2 dr Jeep Wrangler? The Wrangler weighs in around 3400#.

Since I have no experience with a diesel engine whatsoever, input is must needed!!! Thanks

* This post was edited 09/26/18 11:27am by dmatt *


Just the two of us, soon to be retired folks
Madison-the loveable old lady of the dog clan
Riley-our rescued Black Lab
Scout-the new crazy Australian Shepherd puppy



Our camping photos

ScottG

Bothell Wa.

Senior Member

Joined: 02/25/2005

View Profile


Offline
Posted: 09/26/18 11:21am Link  |  Quote  |  Print  |  Notify Moderator

'Cummins"


Scott, Grace and Wesly
2003 Dodge 3500 4x4, 6 speed Cummins (lightly bombed),
2018 Silver Fox 32A - many mods to come!
H0NDA eu2000i

dmatt

Ventura County, CA

Senior Member

Joined: 07/29/2003

View Profile



Good Sam RV Club Member

Offline
Posted: 09/26/18 11:28am Link  |  Quote  |  Print  |  Notify Moderator

ScottG wrote:

'Cummins"


[emoticon]

blownstang01

Upstate NY

Full Member

Joined: 06/06/2016

View Profile



Good Sam RV Club Member

Offline
Posted: 09/26/18 11:31am Link  |  Quote  |  Print  |  Notify Moderator

I would expect it would be under powered while towing, how fast do you want to go ?

ksg5000

Oregon

Senior Member

Joined: 06/30/2008

View Profile



Posted: 09/26/18 11:57am Link  |  Quote  |  Print  |  Notify Moderator

Biggest complaint I hear about that rig is that it has only one air conditioner - deal killer for me.


Kevin

hotjag1

Lake Chelan, Wa/Lake Havasu, Az.

Senior Member

Joined: 07/14/2002

View Profile



Good Sam RV Club Member


Posted: 09/26/18 12:10pm Link  |  Quote  |  Print  |  Notify Moderator

My guess is that you will be going about the same speed up hills with the 275 hp diesel or the V-10. The big difference is that you won't have an engine screaming at 4000 rpm right beside you if you go with the diesel.


hotjag1
2003 40' Allegro Bus, 3 slides, 400hp 8.9 liter ISL Cummins

2000 24' Dynamax Isata


dmatt

Ventura County, CA

Senior Member

Joined: 07/29/2003

View Profile



Good Sam RV Club Member

Offline
Posted: 09/26/18 12:27pm Link  |  Quote  |  Print  |  Notify Moderator

ksg5000 wrote:

Biggest complaint I hear about that rig is that it has only one air conditioner - deal killer for me.


Yeah, that would do it for me as well. However, for 2019 there is a front and rear a/c standard.

[email protected]

Gresham, OR, USA

Senior Member

Joined: 07/17/2004

View Profile



Good Sam RV Club Member

Offline
Posted: 09/26/18 12:37pm Link  |  Quote  |  Print  |  Notify Moderator

The rule of thumb is NO MORE than 100 lbs / HP. So adding your GVWR + the toad weight, and dividing by 275, comes to 101.5 lbs/HP.

So that rig is just over the recommended. You might check to see if the engine can be chipped for more HP (usually no more then 50 HP if I recall is possible) and if the tranni could handle the extra HP, but only if the RV is a great deal.

And of course, it never hurts to just go up hills slowly. My old '94 Cummins 190 HP would occasionally get down to 25 MPH going up a long hill and sometimes even as low as 15 MPH, BUT, it got a good solid 10 MPG too.

Now with my 330HP Cat, I'm at 88 lbs/HP so I'm pleased with that, but it only gets 8.4 MPG.

* This post was edited 09/26/18 12:55pm by [email protected] *


[email protected]
Have shop, will travel!
Visit my travel & RV repair blog site. Subscribe for emailed updates.
Winnebago Journey, '02
Cat 330HP Diesel, 36.5', two slides.

Gjac

Milford, CT

Senior Member

Joined: 08/16/2006

View Profile



Good Sam RV Club Member

Offline
Posted: 09/26/18 12:44pm Link  |  Quote  |  Print  |  Notify Moderator

I met a guy at a CG with one, I liked the size and overall layout and asked how he liked it. He told me it was under powered compared to his short gas MH. Also he said the front end was very light and a little harder to drive. He was trying to shift weight forward to try to offset the heavy engine in the rear and put more weight on the front tires. He got better gas mileage than his friends larger MH's which he liked.

discovery4us

California

Senior Member

Joined: 05/19/2013

View Profile



Good Sam RV Club Member

Offline
Posted: 09/26/18 01:26pm Link  |  Quote  |  Print  |  Notify Moderator

1999 Discovery 36t 5.9 275 HP and 610 ft. lb. torque.

MH solo more than enough power.
MH with 5000 lb. jeep wrangler enough power.
MH with 3/4 ton Silverado toad and rzr under powered.
MH with 9500 lb. cargo trailer way under powered.

Averaging 12 MPG priceless. But than we don't buy these because the are fuel efficient.

You won't be to the top of the hills the fastest but then most trips have more miles of level than hill climbing. I tend to run heavy and ask a lot of the little cummins but she gets it done. I am able to run the Grapvine at 65 solo, could maintain 55 - 60 with the jeep, run 40 - 45 with the truck and rzr, and 30 mph with the cargo trailer. Solo or towing the jeep if I lost momentum I could accelerate back up to speed with the others if I lose momentum not enough to gain speed back.

Reply to Topic  |  Subscribe  |  Print Topic  |  Post New Topic  | 
Page of 4  
Next

Open Roads Forum  >  Class A Motorhomes  >  All

 > 275 HP Cummins diesel on a 31' coach
Search:   Advanced Search

Search only in Class A Motorhomes


New posts No new posts
Closed, new posts Closed, no new posts
Moved, new posts Moved, no new posts

Adjust text size:

© 2018 CWI, Inc. © 2018 Good Sam Enterprises, LLC. All Rights Reserved. | Terms of Use | PRIVACY POLICY | YOUR PRIVACY RIGHTS