Go Back   Thor Forums > Thor Tech Forums > Towing | Hitches and Toads
Click Here to Login
Reply
 
Thread Tools Display Modes
 
Old 10-23-2017, 11:36 AM   #1
Junior Member
 
Brand: Thor Motor Coach
State: Louisiana
Posts: 5
THOR #3766
taking a steep grade downhill

I am going to be traveling east on I-24 from Manchester Tennessee this week. If you have taken your RV over Mt. Eagle Mountain, how did you take the downhill grade? Did you do it in first gear or just let the brake assist handle that steep downhill grade? I am driving a 2013 Thor 37ft class A gas MH pulling a small car on a dolly.
__________________

__________________
brown45cal is offline   Reply With Quote
Old 10-23-2017, 11:43 AM   #2
Axis/Vegas Enthusiast
 
JamieGeek's Avatar
 
Brand: Thor Motor Coach
Model: Axis 24.1
State: Michigan
Posts: 7,786
THOR #1150
Put it in tow-haul mode (press the button on the end of the shifter). On the downhill grade simply tap the break--the trans will downshift every time you do so.
__________________

__________________
2014 Thor Axis 24.1
2018 Chevy Bolt
blog - https://spareelectrons.wordpress.com/
JamieGeek is offline   Reply With Quote
Old 10-23-2017, 12:13 PM   #3
Senior Member
 
Brand: Thor Motor Coach
Model: 37GT
State: Florida
Posts: 808
THOR #5246
What Jamie said, tow/haul mode all the way. In a 37' with the V-10 I would start down at around 50mph tops, the engine will soon find the right gear. When the rpm's start letting you pick up too much speed you can use a little brake to take some speed off and force possibly another downshift, just don't ride the brakes or you will eventually experience "brake fade" because they will get too hot.
__________________
Full Time in 2017 Newmar Ventana 4369
pulling a 24' enclosed (Mini Cooper/Harley/Kayak)
(traded 2014 Thor Challenger)
US Army 70-73 Retired LEO
Joe-FL is offline   Reply With Quote
Old 10-23-2017, 01:43 PM   #4
Senior Member
 
jpmihalk's Avatar
 
Brand: Thor Motor Coach
Model: Hurricane 35C
State: South Dakota
Posts: 1,132
THOR #3761
X2 for Jamie's answer. Tow/Haul is the answer.
__________________
John
2016 Thor Hurricane 35C with pups Piper and Annabelle
2013 Ford Fiesta toad
FMCA - F457085
Blog - https://traversity.us
jpmihalk is offline   Reply With Quote
Old 10-23-2017, 02:25 PM   #5
I Think We're Lost!
 
Bob Denman's Avatar
 
Brand: Still Looking
Model: Tiffin Wayfarer 24 BW
State: New York
Posts: 9,220
THOR #8860
x3...
Take your time, and it'll all work out fine!
__________________
Good Sam Member 843599689
FMCA Member F473304

Current coach: Tiffin Wayfarer 24 BW
Former coach: Thor Outlaw 29-H
Bob Denman is offline   Reply With Quote
Old 10-23-2017, 02:27 PM   #6
Junior Member
 
Brand: Thor Motor Coach
State: Louisiana
Posts: 5
THOR #3766
That is great advice guys. I had another advise me to shift to first gear at the top of the downhill grade. They have a place to stop before heading down. What do you think of 1st gear?
__________________
brown45cal is offline   Reply With Quote
Old 10-23-2017, 02:35 PM   #7
Senior Member
 
16ACE27's Avatar
 
Brand: Thor Motor Coach
Model: ACE 27.1
State: Florida
Posts: 2,289
THOR #7035
Quote:
Originally Posted by brown45cal View Post
That is great advice guys. I had another advise me to shift to first gear at the top of the downhill grade. They have a place to stop before heading down. What do you think of 1st gear?
This is an Interstate, right? Minimum speed limit of 45 mph? In first gear?

Start at 45 mph, tow/haul mode, cruise control. At 50 mph the cruise will downshift automatically to slow you down. If that isn't comfortable you can downshift manually by tapping the brake as Jamie said.

Slow down early, slow down hard when you do brake.
__________________
The USER Formally Known As TFryman
Ted & Melinda
2016 ACE 27.1
2016 Chevy Sonic Toad
16ACE27 is offline   Reply With Quote
Old 10-23-2017, 02:44 PM   #8
Junior Member
 
Brand: Thor Motor Coach
State: Louisiana
Posts: 5
THOR #3766
Tfryman, thanks for information. That answers my questions.
__________________
brown45cal is offline   Reply With Quote
Old 10-23-2017, 03:43 PM   #9
I Think We're Lost!
 
Bob Denman's Avatar
 
Brand: Still Looking
Model: Tiffin Wayfarer 24 BW
State: New York
Posts: 9,220
THOR #8860
It's good to hear that your apprehensions have "slowed down"!
__________________
Good Sam Member 843599689
FMCA Member F473304

Current coach: Tiffin Wayfarer 24 BW
Former coach: Thor Outlaw 29-H
Bob Denman is offline   Reply With Quote
Old 10-23-2017, 04:11 PM   #10
Senior Member
 
Brand: Thor Motor Coach
Model: ACE 29.0
State: Colorado
Posts: 214
THOR #2581
Quote:
Originally Posted by Joe-FL View Post
When the rpm's start letting you pick up too much speed you can use a little brake to take some speed off .
I've never tried this as I generally set my cruise at 50 on the steep grades and forget it but I do have a couple questions on this. Does braking not drop it to yet a lower gear? Is there something in the system that prevents you from shifting down too much and over revving the engine?
__________________
No more wasted time.
Dragon70 is offline   Reply With Quote
Old 10-23-2017, 04:38 PM   #11
Senior Member
 
Brand: Thor Motor Coach
Model: Miramar 33.5
State: Washington
Posts: 217
THOR #578
As stated above the tow/haul mode was designed for just this situation. On my 2016 Miramar, F-53 V-10, there is no red line on my tachometer. Iíve asked the Ford technicians about the tow/haul mode and the what seemed to be very high rpmís while descending a steep grade.

He explained to me that this is engine is de-rated so much, there was no need to place a red line on the tach. He said if I use the engine as designed under normal driving conditions, I would never have a problem.

I too was concerned with the screaming of the engine while descending a steep mountain grade, 4500 rpmís for several minutes. They assured me the engine was designed with this in mind!

Iíve observed all engine parameters available to me while descending grades and have noticed no changes to coolant temp, transmission temp or any other parameters. She just purrs like a kitten when she shifts back into low gear!

Iím fully loaded at approx 21,800 pounds while flat towing a Honda CR-V.
__________________
brianh442 is offline   Reply With Quote
Old 10-23-2017, 04:57 PM   #12
Senior Member
 
bigben's Avatar
 
Brand: Thor Motor Coach
Model: Challenger 37TB
State: Kentucky
Posts: 1,021
THOR #1020
We've been up and down Monteagle - absolutely no problem for your V10. Our coach fully loaded and pulling a 2013 Explorer is about 13 tons. If you want a real lesson, head on out to the Yellowstone Park area. Boogity Boogity!! It makes Monteagle very easy to do. Heading into the east side of Yellowstone out of Cody, or pulling the mountains up and into Ten Sleep from the east provides a graduate degree in V10 driving. Once you have the hang of it, no worries. (IMO) It is all about not hurrying up or down.
__________________
US Army Retired - Loving The Road Trip
Challenger 37TB
bigben is offline   Reply With Quote
Old 10-23-2017, 07:07 PM   #13
Senior Member
 
Brand: Thor Motor Coach
Model: Gemini 24TX (2017)
State: California
Posts: 1,229
THOR #5821
Critical on any steep downgrade, never allow speed to get away from you. Decide what speed is safe and work your transmission and light braking(gasoline) DP let the Jake work its magic, do not under any circumstances pump an air brake system.
__________________
Laco is offline   Reply With Quote
Old 10-23-2017, 07:27 PM   #14
I Think We're Lost!
 
Bob Denman's Avatar
 
Brand: Still Looking
Model: Tiffin Wayfarer 24 BW
State: New York
Posts: 9,220
THOR #8860
Yup! Keep the situation under your control, and you'll never regret the results!
__________________
Good Sam Member 843599689
FMCA Member F473304

Current coach: Tiffin Wayfarer 24 BW
Former coach: Thor Outlaw 29-H
Bob Denman is offline   Reply With Quote
Old 10-23-2017, 08:15 PM   #15
Senior Member
 
Brand: Thor Motor Coach
Model: ACE 29.0
State: Colorado
Posts: 214
THOR #2581
Quote:
Originally Posted by Halibut214 View Post
I've never tried this as I generally set my cruise at 50 on the steep grades and forget it but I do have a couple questions on this. Does braking not drop it to yet a lower gear? Is there something in the system that prevents you from shifting down too much and over revving the engine?
Thanks Brian, though a bit disconcerting at first I knew this was a high revving engine but I would really like to get my questions answered. If I'm already turning 5000 rpm's, hit the brake as was suggested by Joe-FL and it shifts down yet again I'm guessing one of two things are going to happen, the rear wheels are going to start skipping or the engine is going to over rev and unless there is a failsafe of some sort I guarantee you any engine can be over revved.
__________________
No more wasted time.
Dragon70 is offline   Reply With Quote
Old 10-23-2017, 08:24 PM   #16
Senior Member
 
Brand: Still Looking
State: Texas
Posts: 3,690
THOR #2121
The point of using brakes momentarily is to slow down enough so that when transmission does downshift one more gear, you'll be back to 5,000 RPMs or less.

It's key to remember that the lower the gear, and thus the lower the vehicle speed, the more engine braking force will be developed at wheels to prevent a runaway situation.
__________________
Chance is offline   Reply With Quote
Old 10-23-2017, 08:34 PM   #17
Senior Member
 
16ACE27's Avatar
 
Brand: Thor Motor Coach
Model: ACE 27.1
State: Florida
Posts: 2,289
THOR #7035
Quote:
Originally Posted by Halibut214 View Post
Thanks Brian, though a bit disconcerting at first I knew this was a high revving engine but I would really like to get my questions answered. If I'm already turning 5000 rpm's, hit the brake as was suggested by Joe-FL and it shifts down yet again I'm guessing one of two things are going to happen, the rear wheels are going to start skipping or the engine is going to over rev and unless there is a failsafe of some sort I guarantee you any engine can be over revved.
If you are already at 5000 RPM hitting the brake will not downshift you to a lower gear, the ECM (computer) will not allow it.

In fact, most transmissions will automatically upshift if you crank the RPMs up with your foot, even if you forgot and left the shift lever in first or low.
__________________
The USER Formally Known As TFryman
Ted & Melinda
2016 ACE 27.1
2016 Chevy Sonic Toad
16ACE27 is offline   Reply With Quote
Old 10-23-2017, 08:46 PM   #18
Senior Member
 
Brand: Thor Motor Coach
Model: ACE 29.0
State: Colorado
Posts: 214
THOR #2581
Thanks Tfryman. I suspected there was something but the way mine winds up on a steep grade I didn't want to even try this without being reasonably sure.
__________________
No more wasted time.
Dragon70 is offline   Reply With Quote
Old 10-23-2017, 10:20 PM   #19
Senior Member
 
bigben's Avatar
 
Brand: Thor Motor Coach
Model: Challenger 37TB
State: Kentucky
Posts: 1,021
THOR #1020
We've been all over the US through lots of mountains - never had a problem. Start the downgrade in Tow/Haul mode at the posted truck speed (there is reason it is posted lower than cars). In the case of Monteagle it is 35 MPH I believe. Once your coach begins to get a bit over that, I depress the brakes fairly sharply. That may cause a downshift but ofter it doesn't. Between the engine braking and the hit on the brakes occasionally, no problem.
__________________
US Army Retired - Loving The Road Trip
Challenger 37TB
bigben is offline   Reply With Quote
Old 10-23-2017, 10:21 PM   #20
Senior Member
 
Brand: Thor Motor Coach
Model: Gemini 24TX (2017)
State: California
Posts: 1,229
THOR #5821
I can't believe that Ford didn't design the transmission so you can't damage the engine. Every other manufacture does.
__________________

__________________
Laco is offline   Reply With Quote
Reply

Thread Tools
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


» Featured Campgrounds

Reviews provided by

Disclaimer:

This website is not affiliated with or endorsed by Thor Industries or any of its affiliates. This is an independent, unofficial site.




All times are GMT. The time now is 04:31 AM.


Powered by vBulletin® Version 3.8.8
Copyright ©2000 - 2019, vBulletin Solutions, Inc.
Content Relevant URLs by vBSEO 3.6.0 PL2