Go Back   Thor Forums > Thor Tech Forums > Motorhome Tech Topics
Click Here to Login
Reply
 
Thread Tools Display Modes
 
Old 12-26-2019, 11:22 PM   #1
Senior Member
 
jeffpiercemagic's Avatar
 
Brand: Thor Motor Coach
Model: Quantum RW28
State: Florida
Posts: 149
THOR #15031
Tow/Haul switch on class C

So should the Tow/Haul switch on a class C be set to on all the time? Technically you are hauling the motorhome. Will this improve gas mileage?

Jeff
__________________

__________________
jeffpiercemagic is offline   Reply With Quote
Old 12-26-2019, 11:33 PM   #2
Site Team
 
EA37TS's Avatar
 
Brand: Entegra
Model: Accolade 37TS
State: Virginia
Posts: 4,591
THOR #1469
No

Tow/haul is for when you are towing a vehicle or trailer. Using tow haul changes the shift point of the trans and will cause the engine to rev higher between shift points. Using Tow/Haul will generally decrease mileage due to delayed shift points.

Search the forum for tow haul. The topic has been addressed numerous times.
__________________

__________________
Dave
US Army (Ret)
2020 Entegra Accolade 37TS
2019 Jeep Grand Cherokee Trailhawk (Toad)
FMCA - F432054
EA37TS is offline   Reply With Quote
Old 12-26-2019, 11:34 PM   #3
Senior Member
 
jeffpiercemagic's Avatar
 
Brand: Thor Motor Coach
Model: Quantum RW28
State: Florida
Posts: 149
THOR #15031
Quote:
Originally Posted by EA37TS View Post
No

Tow/haul is for when you are towing a vehicle or trailer. Using tow haul changes the shift point of the trans and will cause the engine to rev higher between shift points. Using Tow/Haul will generally decrease mileage due to delayed shift points.

Search the forum for tow haul. The topic has been addressed numerous times.
Thanks Dave, I've seen just the opposite reaction to this question before. I've never used it, I live in Fla so no hills, LOL!

Jeff
__________________
jeffpiercemagic is offline   Reply With Quote
Old 12-26-2019, 11:53 PM   #4
Site Team
 
16ACE27's Avatar
 
Brand: Thor Motor Coach
Model: ACE 27.1
State: Florida
Posts: 4,857
THOR #7035
Jeff, your reasoning would normally be correct but as EA37TS pointed out it does change the shift points (both up and down).

There are those that do have it in TH mode all the time but you need to determine how to use it with your driving style.

On my ACE whether towing or not I do not use it to accelerate or cruise but as soon as I start slowing down to exit the highway or stop at a light I turn it on so it will aggressively downshift to help slow the coach. Once I start speeding up it goes off again.
__________________
Ted & Melinda
2016 ACE 27.1
2016 Chevy Sonic Toad
2020 Chevy Colorado Z71 Trail Runner Alternate Toad
16ACE27 is offline   Reply With Quote
Old 12-27-2019, 12:18 AM   #5
Senior Member
 
ducksface's Avatar
 
Brand: Thor Motor Coach
Model: 2018 24.1 AXISSIXxSIX
State: Arizona
Posts: 2,349
THOR #13932
Mine is on all the time so I can have advantage of the down hill downshift and the brake pedal downshift afforded to me by the haul mode and that added small bit of torque spectrum rpm.

I don't care much about the 1/10th mpg difference I observed over 10,000 mile experiment on my 8.1 Chevy.

The tow haul cruises at the same rpm on flats as not tow haul. That's why the minute to non-existent mpg differences in real life.

Experiment yourself.
As said, some of us drive differently.
You'll get advice from 83mph I'llneverbeadickintraffic folks and 55mph nomatterwhoorwhatorwhy folks.

The debate goes on ad nauseam.
__________________
ducksface is offline   Reply With Quote
Old 12-27-2019, 01:56 AM   #6
Senior Member
 
Brand: Thor Motor Coach
Model: Hurricane 29M
State: Texas
Posts: 1,010
THOR #11781
I keep the tow haul on almost all the time. There was a good explanation on this forum about transmission temperature being reduced by the changes the TCM makes when tow haul is turned on. The way I read the Ford F-53 owners manual leads me to believe it should be turned on when ever I have the toad hooked up which is almost always. So from my perspective, turn it on. If it did not have any value, Ford would not have spent the money on R&D.
__________________
Lt Keefer
2018 Hurricane 29M
CHF, Saf-T-Plus, SumoSprings
Lt Keefer is offline   Reply With Quote
Old 01-11-2020, 06:47 PM   #7
Senior Member
 
Brand: Thor Motor Coach
Model: ACE 30.4
State: Idaho
Posts: 102
THOR #17441
Quote:
Originally Posted by jeffpiercemagic View Post
So should the Tow/Haul switch on a class C be set to on all the time? Technically you are hauling the motorhome. Will this improve gas mileage?

Jeff
I use it a lot in Idaho. Anywhere I go involves mountain passes. Mostly use it for the downshifts. It works in 4 but not 2. I only need 2 on worst cases. I rarely use brakes: just to cause downshift.

I turn it off on the flat.

I am usually pulling a Cherokee toad. It has a brake buddy but doesnít actuate much.

I see no affect on gas mileage with either my previous Class C (E450) or my new Class A (F53). And much to my surprise the mileage is almost the same (7.5 vs. 8).

I often get 85 regular at high elevation. Do not notice an effect from it either.
__________________
IDguy is offline   Reply With Quote
Old 01-11-2020, 06:48 PM   #8
TMD
Junior Member
 
Brand: Thor Motor Coach
Model: Synergy Class C
State: Texas
Posts: 20
THOR #16695
On the Class C Mercedes there is no tow switch. Supposedly it's smart enough to know you are towing according to Mercedes.
__________________
TMD is offline   Reply With Quote
Old 01-11-2020, 07:07 PM   #9
Member
 
Brand: Thor Motor Coach
Model: 25.4
State: California
Posts: 97
THOR #7440
Tow/haul is a feature on Ford powered units, it keeps the transmission from shifting up into overdrive gears when you are towing and running up and down grades, when I tow/haul it also activates the engine brake when you apply the foot brake, to torque converter locks up and the fuel is shut off to the injectors, the more brake force you apply the more the engine brake will help to slow you down, read up on it in your owners manual
__________________
BASSMAN is offline   Reply With Quote
Old 01-11-2020, 10:39 PM   #10
Junior Member
 
Brand: Thor Motor Coach
Model: Miramar 34.2
State: California
Posts: 2
THOR #12192
Tow/Haul button

I loved the T/H feature on my 2015 F-250 when I pulled my 5th wheel, so when my Thor Miramar 34.2 came with the same feature I was happy. I used it mainly in the hills, so it may not mean as much to you in Florida. But, if you get into the up and down hills it will be handy. As previous posters have said, it keeps you "in control" on downhills without having to use your brakes all the time to keep speed under (whatever). And, it does help with the constant shifting in the hills. If you find yourself having to ride the brakes on a long downhill, it will help with that by downshifting. But, pay attention; it's not a "set and forget."
__________________
GKBeck is offline   Reply With Quote
Old 01-11-2020, 11:02 PM   #11
Junior Member
 
Brand: Still Looking
State: Alabama
Posts: 17
THOR #17148
I use Tow/Haul when pulling my toad in traffic or heading downhill: lower shift points keeps the rig easier to stop. I disengage on flats/ when at cruising speed. I drive a bus set on an E350 chassis at a ski resort and use Tow/Haul going downhill. Prevents riding the brakes the entire trip. I disengage on flats.
__________________
KevinH is offline   Reply With Quote
Old 01-12-2020, 01:10 AM   #12
Junior Member
 
Brand: Thor Motor Coach
Model: Axis 24.1
State: Florida
Posts: 11
THOR #14187
I'm towing a small landscape type trailer; 350# with a HD touring bike; 900+#, 1300 - 1400#'s total.
Question is, is this enough additional weight to warrant using TH mode?
Thanks
__________________
largejoe13 is offline   Reply With Quote
Old 01-12-2020, 01:20 AM   #13
Senior Member
 
ducksface's Avatar
 
Brand: Thor Motor Coach
Model: 2018 24.1 AXISSIXxSIX
State: Arizona
Posts: 2,349
THOR #13932
Quote:
Originally Posted by largejoe13 View Post
I'm towing a small landscape type trailer; 350# with a HD touring bike; 900+#, 1300 - 1400#'s total.
Question is, is this enough additional weight to warrant using TH mode?
Thanks
I'm not sure read the posts in this thread.
It's 100% a personal choice.
__________________
Below is a link to most of my modifications either accomplished or pending.
https://www.thorforums.com/forums/f2...n-18996-3.html

Click on my pictures then click the pop-up for a full screen zoomable picture.
ducksface is offline   Reply With Quote
Old 01-12-2020, 01:14 PM   #14
Senior Member
 
Brand: Thor Motor Coach
Model: Thor four winds SF 35
State: Texas
Posts: 148
THOR #13025
Yes the tow haul switch should be left on all the time as your motorhome chassis is loaded all the time. It will improve your shift pattern and improve your gas mileage. It also helps with your braking when it down shifts when stopping.
__________________
Glensouth is offline   Reply With Quote
Old 01-12-2020, 01:14 PM   #15
Member
 
Brand: Thor Motor Coach
Model: Windsport 27B
State: Tennessee
Posts: 42
THOR #14933
Must be stopped?

I assume you shouldn't set while driving?
__________________
mrgscooter is offline   Reply With Quote
Old 01-12-2020, 01:22 PM   #16
Senior Member
 
Brand: Thor Motor Coach
Model: Thor four winds SF 35
State: Texas
Posts: 148
THOR #13025
It can be set at any point.
__________________
Glensouth is offline   Reply With Quote
Old 01-12-2020, 01:43 PM   #17
Site Team
 
16ACE27's Avatar
 
Brand: Thor Motor Coach
Model: ACE 27.1
State: Florida
Posts: 4,857
THOR #7035
Quote:
Originally Posted by mrgscooter View Post
I assume you shouldn't set while driving?
As mentioned by many posts above you can change it at any time as you are driving. How else would you turn it off at speed or turn it on when decelerating?
__________________
Ted & Melinda
2016 ACE 27.1
2016 Chevy Sonic Toad
2020 Chevy Colorado Z71 Trail Runner Alternate Toad
16ACE27 is offline   Reply With Quote
Old 01-12-2020, 01:56 PM   #18
I Think We're Lost!
 
Bob Denman's Avatar
 
Brand: Still Looking
Model: Tiffin Wayfarer 24 BW
State: New York
Posts: 15,642
THOR #8860
How about this answer?
If you like the idea of using it: it's your choice!

http://www.thorforums.com/forums/att...1&d=1578840940
Attached Thumbnails
Click image for larger version

Name:	Floating Your Goat.jpg
Views:	55
Size:	149.2 KB
ID:	22171  
__________________
Good Sam Member 843599689
Current coach: Tiffin Wayfarer 24 BW
"History shows again and again; how Nature points out the folly of Man!"
Bob Denman is offline   Reply With Quote
Old 01-12-2020, 04:36 PM   #19
Senior Member
 
Brand: Thor Motor Coach
Model: ACE 30.4
State: Idaho
Posts: 102
THOR #17441
Quote:
Originally Posted by BASSMAN View Post
Tow/haul is a feature on Ford powered units, it keeps the transmission from shifting up into overdrive gears when you are towing and running up and down grades, when I tow/haul it also activates the engine brake when you apply the foot brake, to torque converter locks up and the fuel is shut off to the injectors, the more brake force you apply the more the engine brake will help to slow you down, read up on it in your owners manual
Thanks for the suggestion. Caused me to download the manual. I’ll experiment to understand in total what this really means, especially the last point of pressing the accelerator to slow down. It does not mean using the brakes to control speed on mountain passes!

It appears to differ from how it worked with my E450 Class C. I do stab the brakes to cause downshift.

I don’t think tow/haul works in 2.

My shifter doesn’t have all the gears shown in the manual I found.

“The tow/haul feature:
• Delays upshifts to reduce the frequency of transmission shifting.
• Provides engine braking in all forward gears, which will slow your vehicle and assist you in controlling your vehicle when descending a grade.
• Depending on driving conditions and load conditions, may downshift the transmission, slow your vehicle and control your vehicle speed when descending a hill, without pressing the accelerator pedal. The amount of downshift braking provided will vary based upon the amount the brake pedal is pressed.
The tow/haul feature improves transmission operation when towing a trailer or a heavy load. All transmission gear ranges are available when using tow/haul.
Automatic Transmission Adaptive Learning
This feature may increase durability and provide consistent shift feel over the life of your vehicle. A new vehicle or transmission may have firm shifts, soft shifts or both. This operation is considered normal and will not affect function or durability of the transmission. Over time, the adaptive learning process will fully update transmission operation.
Forced Downshifts
• Allowed in drive (D) with the tow/haul feature on or off.
• Press the accelerator pedal to the floor.
• Allows transmission to select an appropriate gear“
__________________
IDguy is offline   Reply With Quote
Old 01-12-2020, 04:47 PM   #20
Senior Member
 
Brand: Thor Motor Coach
Model: ACE 30.4
State: Idaho
Posts: 102
THOR #17441
I also need to experiment with the interaction of cruise control and tow haul. I use cruise to control downhills on modest passes with my Jeep and Canyon pickup. They do not have a tow haul mode. But with six to eight gears cruise causes the necessary downshifts without touching the brakes.

They both have manual shifting override that the F53 does not. I sometimes use 4 on the F53, and rarely 2 on serious passes.
__________________

__________________
IDguy 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 10:15 AM.


Powered by vBulletin® Version 3.8.8
Copyright ©2000 - 2020, vBulletin Solutions, Inc.
Content Relevant URLs by vBSEO 3.6.0 PL2
×