Dec-02-2017 07:24 AM
Dec-04-2017 06:04 PM
Dec-04-2017 05:06 PM
gutfelt wrote:Groover wrote:msturtz wrote:
I'm running a 2014 Thor Palazzo 33.3. It has a ISB 300 and Allison 2100 MH. I could go to ISB 340 / 700 with the same transmission. I have towed a 2015 Suburban, 2015 GMC Acadia Denali, 2016 Yukon Denali XL, and 2017 Ford Explorer. The I am at my max GCWR when I tow the Yukon and the motor home is empty. The transmission does downshift. I have traveled over the rocky mountains 4 times with this setup (pulling the Acadia) we had no problems. I probably will upgrade to ISB 340.
Are you planning to upgrade the engine that you have? How do you plan to do that and how much do you expect it to cost?
LOL Iam pretty sure he means upgrade to a mh that has more power because the
300 ISB towing a Denali xl 4x4 will be in 2nd gear at 25MPH going over mamouth mountain type passes LOL
frankly get he 360hp if your only going still with a ISB
Dec-04-2017 04:08 PM
Dec-04-2017 03:34 PM
Groover wrote:msturtz wrote:
I'm running a 2014 Thor Palazzo 33.3. It has a ISB 300 and Allison 2100 MH. I could go to ISB 340 / 700 with the same transmission. I have towed a 2015 Suburban, 2015 GMC Acadia Denali, 2016 Yukon Denali XL, and 2017 Ford Explorer. The I am at my max GCWR when I tow the Yukon and the motor home is empty. The transmission does downshift. I have traveled over the rocky mountains 4 times with this setup (pulling the Acadia) we had no problems. I probably will upgrade to ISB 340.
Are you planning to upgrade the engine that you have? How do you plan to do that and how much do you expect it to cost?
Dec-04-2017 03:02 PM
Dec-04-2017 02:56 PM
msturtz wrote:
I'm running a 2014 Thor Palazzo 33.3. It has a ISB 300 and Allison 2100 MH. I could go to ISB 340 / 700 with the same transmission. I have towed a 2015 Suburban, 2015 GMC Acadia Denali, 2016 Yukon Denali XL, and 2017 Ford Explorer. The I am at my max GCWR when I tow the Yukon and the motor home is empty. The transmission does downshift. I have traveled over the rocky mountains 4 times with this setup (pulling the Acadia) we had no problems. I probably will upgrade to ISB 340.
Dec-04-2017 02:49 PM
eheading wrote:
We have had a number of motorhomes with Cummins and CAT engines with the 3000 series Allison transmissions. Our last Revolution LE had the 400 hp CAT. We now have the short Ventana LE with the 340 hp engine with the 2000 series transmission. Yes, it does shift down to 5th gear more than our 400 hp CAT did, but because it is governed at 2800 rpm, I have found that it does as well on hills as our larger engines did. In addition, the 2500 transmission is the smoothest shifting Allison we have ever had. The shift in and out of 4th gear was always a little rough, we can hardly feel this one shifting. In addition I like the 9,5 to 10 mpg compared to our 7.2 in our last motorhome, and I really like the flat floor all the way to the rear closet, a feature which I believe is only available with the 340 hp Cummins engine.
Dec-04-2017 01:13 PM
gutfelt wrote:msturtz wrote:
I'm running a 2014 Thor Palazzo 33.3. It has a ISB 300 and Allison 2100 MH. I could go to ISB 340 / 700 with the same transmission. I have towed a 2015 Suburban, 2015 GMC Acadia Denali, 2016 Yukon Denali XL, and 2017 Ford Explorer. The I am at my max GCWR when I tow the Yukon and the motor home is empty. The transmission does downshift. I have traveled over the rocky mountains 4 times with this setup (pulling the Acadia) we had no problems. I probably will upgrade to ISB 340.
A suburban weighs more than a 2015 yucon or explorer
Dec-04-2017 01:01 PM
Dec-04-2017 07:07 AM
Dec-04-2017 06:15 AM
Dec-04-2017 05:59 AM
Ductape wrote:
Thanks for sharing, my pet peeve is not the mountains, as I don't have any objection to gearing down to climb a long grade, that's expected. What I dislike is a gear change just to climb an overpass in flat country, or a moderate rolling hill.
A little work with a spreadsheet has given me my answer I believe. Taking as an example recent Newmars:
Ventana with the 360/800 will produce 2,486 lb-ft at the axle in 6th gear @ 65 mph. Disregarding accessories and drivetrain losses.
Ventana LE with the 340/700 will be only 1,759 lb-ft under the same conditions due to torque limiting in 6th gear.
Dropping the LE into 5th gear provides full torque and gets the axle up to 2,476.
So in essence 5th on the Allison 2500 equipped coaches will be equivalent of 6th in a coach with the Allison 3000 and the 360/800 engine.
That's enough to convince me to seek out a coach with the bigger trans. Not to mention running the weight numbers I'd be over GCWR on the smaller Allison with cargo in the coach plus a 6k toad.
Dec-02-2017 03:02 PM
msturtz wrote:
I'm running a 2014 Thor Palazzo 33.3. It has a ISB 300 and Allison 2100 MH. I could go to ISB 340 / 700 with the same transmission. I have towed a 2015 Suburban, 2015 GMC Acadia Denali, 2016 Yukon Denali XL, and 2017 Ford Explorer. The I am at my max GCWR when I tow the Yukon and the motor home is empty. The transmission does downshift. I have traveled over the rocky mountains 4 times with this setup (pulling the Acadia) we had no problems. I probably will upgrade to ISB 340.
Dec-02-2017 02:26 PM
Dec-02-2017 02:22 PM