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06-14-2018, 07:45 PM
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#1
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Member
Brand: Thor Motor Coach
Model: Freedom Elite 22fe
State: North Carolina
Posts: 45
THOR #11657
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Tow Haul button
I saw someone post about using the tow haul button going downhill. Can someone elaborate on this for me.
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06-14-2018, 07:48 PM
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#2
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I Think We're Lost!
Brand: Still Looking
Model: Tiffin Wayfarer 24 BW
State: New York
Posts: 22,195
THOR #8860
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From my limited experience with it:
If you engage the Tow/Haul Mode, and tap the brakes: the transmission will downshift a gear for you...
__________________
"What: me worry?"
Good Sam Member 843599689
Current coach: Tiffin Wayfarer 24 BW
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06-14-2018, 10:15 PM
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#3
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Senior Member
Brand: Thor Motor Coach
Model: Hurricane 35C
State: South Dakota
Posts: 1,132
THOR #3761
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Tow/Haul is designed to keep you from burning up your brakes by letting the engine/transmission do all of the work. It will downshift for you with a tap of the brakes and then the higher RPMs help slow you down.
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John
2016 Thor Hurricane 35C with pups Piper and Annabelle
2013 Ford Fiesta toad
FMCA - F457085
Blog - https://traversity.us
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06-14-2018, 10:25 PM
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#4
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I Think We're Lost!
Brand: Still Looking
Model: Tiffin Wayfarer 24 BW
State: New York
Posts: 22,195
THOR #8860
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From what I've been able to figure out: the V-10 likes to rev a bit... and the computer management system won't let you downshift it to the point where you can hurt it.
I've got some hills around me, where I end up "tapping it down" two or three gears.
__________________
"What: me worry?"
Good Sam Member 843599689
Current coach: Tiffin Wayfarer 24 BW
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06-14-2018, 10:59 PM
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#5
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Senior Member
Brand: Thor Motor Coach
Model: Hurricane 31S
State: Texas
Posts: 4,157
THOR #6411
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Tow/haul increases the transmission clutches engagement pressure, making the shifts more rapid, thus decreasing trans temperature. It also reschedules the shifting parameters; this allowing the transmission to stay in a lower gear for longer. The computer (ECU) limited max RPM is 5,250 rpm for the Triton V-10. My coach will shift into sixth at 48 mph (1,450 rpm) with no load on the engine with the tow/haul off. With the tow/haul on, it will not shift into sixth until 68 mph (2,050 rpm). I limit my towing to about 60 mph so the trans never shifts into sixth. Normal shift schedule will allow the trans to down shift down to fifth and fifth to fourth with each application of the brakes if the coach is accelerating downhill foot off the accelerator. With the tow/haul engaged, the transmission will continue to downshift each time the brakes are depressed in the coach is still accelerating. When the computer detects that a requested downshift would over speed the engine, the trans will not downshift
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Jim & Roy Davis
2016 Hurricane 31S
1961 Rampside in tow
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10-03-2018, 06:44 PM
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#6
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Member
Brand: Thor Motor Coach
Model: Palazzo 37.4
State: Florida
Posts: 86
THOR #7274
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As a followup to this, I have a Thor Outlaw 37LS and cannot locate a tow/haul mode switch (not even listed in manual). Does this not exist on all models?
Also, does engaging cruise control help downshift when descending steep grades, or should it be disengaged and manually downshift?
Thanks!
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10-03-2018, 07:17 PM
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#7
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I Think We're Lost!
Brand: Still Looking
Model: Tiffin Wayfarer 24 BW
State: New York
Posts: 22,195
THOR #8860
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What year is your Outlaw?
__________________
"What: me worry?"
Good Sam Member 843599689
Current coach: Tiffin Wayfarer 24 BW
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10-03-2018, 08:39 PM
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#8
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Member
Brand: Thor Motor Coach
Model: Palazzo 37.4
State: Florida
Posts: 86
THOR #7274
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Quote:
Originally Posted by bob denman
what year is your outlaw?
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2014...
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10-03-2018, 09:18 PM
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#9
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Site Team
Brand: Thor Motor Coach
Model: ACE 27.1
State: Florida
Posts: 14,117
THOR #7035
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Quote:
Originally Posted by JeffnBeth
As a followup to this, I have a Thor Outlaw 37LS and cannot locate a tow/haul mode switch (not even listed in manual). Does this not exist on all models?
Also, does engaging cruise control help downshift when descending steep grades, or should it be disengaged and manually downshift?
Thanks!
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Should be a button on the end of the gearshift.
And cruise control will downshift the coach to slow you down at 5 mph over the setpoint.
__________________
Ted & Melinda
2016 ACE 27.1
2016 Chevy Sonic Toad - Selling
2020 Chevy Colorado Z71 Trail Runner Toad
2024 Chevrolet Trax 2RS - Soon 2B TOAD
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10-03-2018, 09:38 PM
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#10
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I Think We're Lost!
Brand: Still Looking
Model: Tiffin Wayfarer 24 BW
State: New York
Posts: 22,195
THOR #8860
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__________________
"What: me worry?"
Good Sam Member 843599689
Current coach: Tiffin Wayfarer 24 BW
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10-03-2018, 11:20 PM
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#11
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Senior Member
Brand: Thor Motor Coach
Model: 34F
State: Oklahoma
Posts: 628
THOR #8432
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Quote:
Originally Posted by Tfryman
Should be a button on the end of the gearshift.
And cruise control will downshift the coach to slow you down at 5 mph over the setpoint.
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Yeah I bought a low miles used truck that was made in the age of Dinosaurs (2002) and it came with that button on the gearshift. Now I know what it used for vice using the 4 wheel high and low gearing. Glad the motorhome just has that button to use. Less work.
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10-04-2018, 11:29 AM
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#12
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Member
Brand: Thor Motor Coach
Model: Palazzo 37.4
State: Florida
Posts: 86
THOR #7274
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Quote:
Originally Posted by Tfryman
Should be a button on the end of the gearshift.
And cruise control will downshift the coach to slow you down at 5 mph over the setpoint.
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Thanks for the reply. So O/D (or over drive) is the the same as tow/haul mode? Excuse my ignorance here - but i've never had to really think about these things.
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10-04-2018, 12:43 PM
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#13
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Site Team
Brand: Thor Motor Coach
Model: ACE 27.1
State: Florida
Posts: 14,117
THOR #7035
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Quote:
Originally Posted by JeffnBeth
Thanks for the reply. So O/D (or over drive) is the the same as tow/haul mode? Excuse my ignorance here - but i've never had to really think about these things.
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No, Overdrive is simply a gearing that makes the transmission output shaft turn faster than the engine. i.e., greater than a 1:1 drive ratio. Older vehicles sometimes had a separate "Overdrive" gearbox controlled electrically.
In most modern vehicles the highest gear is normally an overdrive ratio; in a 5 speed that would be 5th gear.
Tow/haul changes the shift points and shift programming; it does not change the gear ratios.
__________________
Ted & Melinda
2016 ACE 27.1
2016 Chevy Sonic Toad - Selling
2020 Chevy Colorado Z71 Trail Runner Toad
2024 Chevrolet Trax 2RS - Soon 2B TOAD
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09-20-2019, 04:00 PM
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#14
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Senior Member
Brand: Thor Motor Coach
State: New Hampshire
Posts: 156
THOR #14097
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Is this of any use going uphill? Sorry to be so ignorant but not too knowledgeable about it
Thanks
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09-20-2019, 04:13 PM
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#15
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I Think We're Lost!
Brand: Still Looking
Model: Tiffin Wayfarer 24 BW
State: New York
Posts: 22,195
THOR #8860
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Going uphill?
Yup: it's good for that as well!
__________________
"What: me worry?"
Good Sam Member 843599689
Current coach: Tiffin Wayfarer 24 BW
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09-20-2019, 04:21 PM
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#16
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Senior Member
Brand: Thor Motor Coach
State: New Hampshire
Posts: 156
THOR #14097
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Does it give you more power? Went up a 10% grade in the Tetons and oh my were we slow....
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09-20-2019, 04:42 PM
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#17
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I Think We're Lost!
Brand: Still Looking
Model: Tiffin Wayfarer 24 BW
State: New York
Posts: 22,195
THOR #8860
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More power? No.
But it does help your transmission work easier; by keeping it in a lower gear.
__________________
"What: me worry?"
Good Sam Member 843599689
Current coach: Tiffin Wayfarer 24 BW
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09-20-2019, 04:48 PM
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#18
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Senior Member
Brand: Thor Motor Coach
State: New Hampshire
Posts: 156
THOR #14097
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Like I said...ignorant. thanks
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09-20-2019, 04:55 PM
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#19
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Senior Member
Brand: Thor Motor Coach
Model: Hurricane 32A
State: Florida
Posts: 1,873
THOR #2829
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Quote:
Originally Posted by Cpd
Like I said...ignorant. thanks
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We don't learn if we don't ask...
It alters the shift points to better use the available power. I use it in hilly areas especially when towing and often use it with cruise control.
Some do not like the downshift (on the 6 speed it will drop from 6th to 4th - both 5 and 6 are overdrive gears) - the engine will rev and be loud - but to me it does the job I need... maintaining speed both uphill and downhill.
Also when tow/haul is on - without cruise control - a quick tap of the brakes will also cause a downshift to slow you down.
__________________
Greg
Not yet retired...
Florida (Michigan transplant)
2014 Hurricane 32A
2000 Infinity (previous)
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09-20-2019, 04:56 PM
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#20
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Senior Member
Brand: Thor Motor Coach
State: New Hampshire
Posts: 156
THOR #14097
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Thanks so much!
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