Journey with Confidence RV GPS App RV Trip Planner RV LIFE Campground Reviews RV Maintenance Take a Speed Test 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.
Reply
  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 11-30-2021, 12:04 AM   #15
Senior Member
 
Suburbazine's Avatar


 
Join Date: Jul 2021
Location: Pigeon Forge, TN
Posts: 700



48.5k going down the road. 38.5 coach and 10k toad. Only has 380hp/1250tq with a 6 speed and has no issues on hills other than falling to lower gears on steep grades. I haven't tried any steep grades with the toad, but without the toad I sustained 38mph through most of the 7% I-8 grade and fell down another gear to around 30mph on the 7.5% section. It's no rocket, but it is never scary on hills either.


The Cummins/Allison programming will try to hold the engine around governed RPM (1800) where possible to maintain power band peak. I wouldn't recommend stuffing the gas pedal or manually downshifting unless you are in a sub-optimal gear (not enough RPM) and want to be ahead of the curve when the load picks up. The worst thing that could happen is you are too fast for the hill and find a slower car in the way. Almost 100% guarantee the loss of speed will downshift you into a very slow gear for the hill and you'll never get it back.



And putting your foot on the floor when it is in a low gear pretty much only guarantees it holds that gear all the way up the hill. Unlike any normal car or truck, the gas pedal is only used to indicate power demand, not how fast you want to go.So if your foot is on the floor (calling for maximum power) the powertrain controller will look at your current load, percentage of maximum power being produced and expected RPM (power point) if it upshifts. It will decide that it will make [i[less[/i] power if it were to go faster and upshift, therefore it will not go any faster. This is why you may (or may not with rear engines) notice the radiator fan cut out when you put your foot on the floor. The engine will sacrifice cooling performance and allow an over-power condition (you'll see the temp gauge climb like a rocket) until it thermally limits on the power boost. The radiator fan(s) are worth about 70-100hp at full engagement.
Attached Thumbnails
Click image for larger version

Name:	259998894_10158437243943342_3567455807931196690_n.jpg
Views:	152
Size:	450.4 KB
ID:	350145  
__________________
2021 Newmar Super Star 4051, Glacier Interior + Exterior
2021 Bravo Silver Star 24'
2019 Kia Stinger GT2 AWD, White Pearl
Suburbazine is offline   Reply With Quote
Join the #1 RV Forum Today - It's Totally Free!

iRV2.com 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 11-30-2021, 04:56 AM   #16
Senior Member
 
STEVE-JUNELL's Avatar
 
Join Date: Mar 2013
Location: Nappanee, IN
Posts: 516
Quote:
Originally Posted by oldcoon View Post
And your curb wt toad is heavier than mine. I'm not expecting a rocket ship but mine is disappointing.


I have ran them all. we had a 2008 Essex and a king aire, I even brought a Ventana back this week and towed my truck I was a little nervous on that one but it did just fine. I normally drive with the cruise as you get 100% of engine performance it’s no corvette but gets the job done.
__________________
22 Essex 4551, 20 Denali diesel 3500 crew, 04 Rubicon, or 24' enclosed ATC trailer
STEVE-JUNELL is offline   Reply With Quote
Old 11-30-2021, 05:20 AM   #17
Senior Member
 
lakebuster's Avatar
 
Newmar Owners Club
Join Date: Aug 2015
Location: Ponchatoula,Louisiana
Posts: 866
We have a LA with the 15L Cummins, if I get below the torque curve, due to being stuck behind a slow truck, I release throttle and manually downshift when I can pass. Other wise it will lug the engine and feel like I am pulling a weighted sled!
__________________
David and Sharon
2017 Newmar London Aire 4519
2020 Jeep Wrangler Rubicon
lakebuster is offline   Reply With Quote
Old 11-30-2021, 06:13 AM   #18
Senior Member
 
Newmar Owners Club
Join Date: Dec 2018
Location: North Carolina
Posts: 673
It would be worth a call to Cummins Care to discuss your specific situation.
Clemson is offline   Reply With Quote
Old 11-30-2021, 06:50 AM   #19
Senior Member
 
Join Date: Nov 2018
Posts: 457
I have a 2019 London Aire with the 605 hp pulling a RAM 1500 Out west here if I get stuck behind a slower vehicle on some of these steeper grades it is almost impossible to get back up to speed. It's when you get behind the power curve you have the problem. As long as I stay rolling I have no problems with slowing down.
__________________
Scott R
2019 London Aire 4543 SL605 FCCC
2023 Jeep Grand Cherokee Summit
sramer is offline   Reply With Quote
Old 11-30-2021, 07:15 AM   #20
Senior Member
 
rffowler55's Avatar
 
Join Date: Feb 2020
Location: North Georgia Mountains
Posts: 588
Quote:
Originally Posted by oldcoon View Post
60k going down the road Attachment 350132
I agree with other comments, that is a beautiful coach. Love the color scheme.
__________________
2007 Newmar Baystar; 3201; SumoSprings Front; Timbren Springs Rear; Safe-T-Plus; 2016 Fiat 500; Roadmaster Falcon 2;Demco SBS DUO Braking System;TST 507; Bilstein shocks; Garmin RV 785; Supersteer Rear Trac Bar, Thule Easyfold XT2,RVWhisper
rffowler55 is offline   Reply With Quote
Old 11-30-2021, 10:06 AM   #21
Senior Member
 
Join Date: Mar 2017
Location: North, South Carolina
Posts: 121
Thanks guys. I have an appt. with the Cummins Doc. Unfortunately though, I have to wait till Jan 7th.
oldcoon is offline   Reply With Quote
Old 11-30-2021, 10:31 AM   #22
Senior Member
 
Capt. Bill's Avatar
 
Join Date: Jun 2009
Location: Highland,IL.
Posts: 1,134
I have a 2014 MADP with a Cummings 450 Hp in it, pulling a loaded Ram 1500 4X4. The trick is to keep your RPM's up as you approach the grade- I try to hit 2000 RPM at the start of the grade & keep it pedal to the metal all the way up. I generally don't get below 50 MPH unless the grade is >6%. If I have to, I'll manually downshift to keep the RPM's above 1,600. You don't want to drop below that as you'll start lugging the engine as it falls below the power curve.

Happy Trails
__________________
Capt. Bill
2014 Newmar Mountain Aire Diesel 4364
2009 Ram 1500 Crew cab toad
Capt. Bill is online now   Reply With Quote
Old 11-30-2021, 11:23 AM   #23
Senior Member
 
Join Date: Jul 2014
Posts: 35,317
Have you tried that hill without the toad behind you ?

That will at least give you a baseline of how it does. Then head to Mr. Cummins.
twinboat is offline   Reply With Quote
Old 11-30-2021, 04:22 PM   #24
Senior Member
 
Join Date: Mar 2017
Location: North, South Carolina
Posts: 121
Quote:
Originally Posted by twinboat View Post
Have you tried that hill without the toad behind you ?

That will at least give you a baseline of how it does. Then head to Mr. Cummins.
No sir. Unfortunately I'm 3 hrs away from the mountains.
oldcoon is offline   Reply With Quote
Old 12-01-2021, 04:50 PM   #25
Senior Member
 
Vickie 4369's Avatar
 
Join Date: Nov 2012
Location: WATERBURY, CT.
Posts: 1,219
I find that it depends alot on what speed you approach the hill.

Honestly is doesn't sound right but If I hit the hills over 70 I roll right up them with minimal loss

If I hit the hill at 60 speed falls more so.

I use cruise control as much as possible.

I pull a 12,000 trailer behind my Ventana 4369 which has the L9 451 HP 1250 lb ft. engine program.

Or I am pulling my Jeep Gran Cherokee Trail Hawk.

Surprisingly there is not much difference between the 2.

There may be something wrong with your rig.

Ted.
__________________
My name is Ted, My coach 2019 NEWMAR Ventana 4369 (Vickie) Cummins L9 451 Horsepower.
Vickie 4369 is offline   Reply With Quote
Old 12-01-2021, 05:00 PM   #26
Senior Member
 
Granite17's Avatar
 
Join Date: May 2018
Posts: 823
Quote:
Originally Posted by Vickie 4369 View Post
I find that it depends alot on what speed you approach the hill.

Honestly is doesn't sound right but If I hit the hills over 70 I roll right up them with minimal loss

If I hit the hill at 60 speed falls more so.

I use cruise control as much as possible.

I pull a 12,000 trailer behind my Ventana 4369 which has the L9 451 HP 1250 lb ft. engine program.

Or I am pulling my Jeep Gran Cherokee Trail Hawk.

Surprisingly there is not much difference between the 2.

There may be something wrong with your rig.

Ted.

Share how you boosted your 400 to 451 ? Was that a Cummins tune?
__________________
John, Sharon & (Luna)-Blk.Tri.Australian Sheppard
2022 Newmar LA 4551, 2019 DS4018 Sold
21' Tahoe Z71, Demco base, Avail bar, Air Force 1.
Granite17 is offline   Reply With Quote
Old 12-01-2021, 08:24 PM   #27
Senior Member
 
Petes Dad's Avatar
 
Fleetwood Owners Club
Join Date: Aug 2013
Location: Casper, Wyoming
Posts: 246
Click image for larger version

Name:	IMG_1309.jpg
Views:	41
Size:	280.1 KB
ID:	350317 you should have much more power than that. Have it put on a scanner to see if you have any underlying problems not throwing a code. We are pulling 3 times that weight through the Rocky Mountain region with twice that performance.
__________________
2013 Newmar Essex 4544
69' Camaro in tow
Petes Dad is offline   Reply With Quote
Old 12-02-2021, 06:22 AM   #28
Senior Member
 
Vickie 4369's Avatar
 
Join Date: Nov 2012
Location: WATERBURY, CT.
Posts: 1,219
Quote:
Originally Posted by Granite17 View Post
Share how you boosted your 400 to 451 ? Was that a Cummins tune?
Yes sir as soon as I got home from Florida where I purchased it I contacted my Freightliner dealer for an Uprate.

Cost on a new coach was 13xx.00 and maintains the factory 5 year 100K warranty.

As mileage is gained cost for uprate goes down I have heard of guys getting it for a couple hundred out of warranty.

You can read about it here.

https://www.irv2.com/forums/f123/any...hp-468716.html
__________________
My name is Ted, My coach 2019 NEWMAR Ventana 4369 (Vickie) Cummins L9 451 Horsepower.
Vickie 4369 is offline   Reply With Quote
Reply



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
Disappointed with KVH Upgrade Gadget Man Technology: Internet, TV, Satellite, Cell Phones, etc. 4 01-08-2011 12:10 PM
Disappointed in Winnebago C&C R Winnebago Industries Owner's Forum 20 02-15-2008 02:13 PM
Disappointed with 2005 Trailer Life Rv Parks & Campground Navigator CD set Jack Wilkinson Gear and Product Discussions 20 11-21-2005 02:25 PM
Disappointed in handling of E350 based class B+ Bo MH-General Discussions & Problems 4 04-04-2005 08:04 AM

» Featured Campgrounds

Reviews provided by


All times are GMT -6. The time now is 08:28 PM.


Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2024, vBulletin Solutions, Inc.