Reply
 
Thread Tools Display Modes
Old 04-28-2016, 11:35 AM   #1
Member
 
Join Date: Mar 2016
Posts: 38
F-150 towing a Hybrid 23SS - something is wrong...

Picked up a Shamrock 23SS a few weeks back, we have been getting it tweaked and setup for creature comforts in the drive. Had to bring it back up to the dealer the other day to get a leak in the bunk ends fixed.

Our first trip home with it we didn't pay a whole ton of attention to mileage or whatnot, it seemed to roll along well and we were happy to have a New to us camper.

This trip we filled up and paid attention. in 100 miles round trip the F150 ate up nearly 1/2 a tank of gas! That's going to make for some long expensive trips having to fill up every 200 miles.

Trailer is 23 ft long tongue to back - Tandem Axle - Shamorck 23SS Hybrid 4432 dry GVWR 6278

Truckis 2006 F-150 XLT SCrew with factory tow package including heavy duty hitch, larger trans cooler, and air assist bladders with 5100 adjustable Bilstein shocks.

Now where I think my issue may be... The truck has always seemed to have sort of a trans shutter on long slow slopes. When I got it from the dealer it had big 33" tires on it - but I am not sure they ever adjusted the speedo to the tire size, which seems to me would also mess up shifting?

I am working on 3 different ideas...

1 - Install a Chip Tuner to adjust performance for towing and adjust systems to the larger tires

2 - Put new tires on that are factory sized ( 30" as opposed to current 33"s )

3 - Switching from the factory 3:55 to a 4:10 rear differential or maybe larger to specifically setup for towing

I am not sure what will/will not work, and my options get exponentially more expensive as I go down the list.

Any help from the folks that have done this all before on what I can do to get this truck set up for towing would be awesome!
__________________

__________________
Stygshore is offline   Reply With Quote
Old 04-28-2016, 11:41 AM   #2
Senior Member
 
Join Date: Oct 2015
Posts: 2,270
Quote:
Originally Posted by Stygshore View Post
Picked up a Shamrock 23SS a few weeks back, we have been getting it tweaked and setup for creature comforts in the drive. Had to bring it back up to the dealer the other day to get a leak in the bunk ends fixed.

Our first trip home with it we didn't pay a whole ton of attention to mileage or whatnot, it seemed to roll along well and we were happy to have a New to us camper.

This trip we filled up and paid attention. in 100 miles round trip the F150 ate up nearly 1/2 a tank of gas! That's going to make for some long expensive trips having to fill up every 200 miles.

Trailer is 23 ft long tongue to back - Tandem Axle - Shamorck 23SS Hybrid 4432 dry GVWR 6278

Truckis 2006 F-150 XLT SCrew with factory tow package including heavy duty hitch, larger trans cooler, and air assist bladders with 5100 adjustable Bilstein shocks.

Now where I think my issue may be... The truck has always seemed to have sort of a trans shutter on long slow slopes. When I got it from the dealer it had big 33" tires on it - but I am not sure they ever adjusted the speedo to the tire size, which seems to me would also mess up shifting?

I am working on 3 different ideas...

1 - Install a Chip Tuner to adjust performance for towing and adjust systems to the larger tires

2 - Put new tires on that are factory sized ( 30" as opposed to current 33"s )

3 - Switching from the factory 3:55 to a 4:10 rear differential or maybe larger to specifically setup for towing

I am not sure what will/will not work, and my options get exponentially more expensive as I go down the list.

Any help from the folks that have done this all before on what I can do to get this truck set up for towing would be awesome!

Any benefits you'll gain from any of those ideas will be so small you'll not notice anything. Save the money you would spend on those for gas. You're towing a wall through the air. The best thing to get max mileage is slow down. The sweet spot will be somewhere around 60-65MPH. As you go faster the mileage will drop almost exponentially. Welcome to full height trailers. You could always get a diesel but you have to tow a ton of miles to offset the initial cost and it sounds like your occasionally camping and not full timing.
__________________

__________________
Mr Havercamp is offline   Reply With Quote
Old 04-28-2016, 11:46 AM   #3
Senior Member
 
Join Date: Jun 2012
Posts: 6,741
Most folks with gasser 1/2 tons seem to get 9-11 mpg while towing. So assuming your gas tank is around 20 gals, you're doing about what everyone else is getting. You're pulling a giant sail down the highway.

With respect to tires: Check the outside diameter of your 33" tires. You may find it's the same as the 30" tires you want to put, it's just the wheel that's bigger. (My Traverse is this way - comes with 18" or 20" tires, but the OD of both is the same.)

Unless you do a lot of towing, the options you're looking at may not be cost-effective.
__________________
1988 Coleman Sequoia - popup (1987-2009) - outlasted 3 Dodge Grand Caravans!
2012 Roo19 - hybrid (2012-2015)

2016 Mini Lite 2503S - tt (2015 - ???)
2011 Traverse LT, 3.6L, FWD
2009 Silverado 1500 Ext Cab, 5.3L, 4x4, 3.73
2016 Silverado 2500HD Dbl Cab, 6.0L 4x4, 4.10
rockfordroo is online now   Reply With Quote
Old 04-28-2016, 11:53 AM   #4
Member
 
kevinstennes's Avatar
 
Join Date: Jan 2015
Posts: 47
I have a 2012 and a 2015 F150, both with 5.0 V8, 4x4, Screw, 3.55 rears. Haven't towed with the 2015 yet, but plan to do so next month on a 2,000 mile trip. Towing my 27' TT with the 2012 yields between 8.8 and 9.8 MPG, at the very best. We'll see how the 2015 does with the trailer, as it certainly gets better mileage than the 2012, when not towing.

I'm not sure anything is wrong with your truck. I have 35 gal tanks on my trucks and the needle moves pretty fast.
__________________
kevinstennes is offline   Reply With Quote
Old 04-28-2016, 12:06 PM   #5
Senior Member
 
KMP44's Avatar
 
Join Date: Apr 2013
Location: Central New York
Posts: 1,025
Quote:
Originally Posted by Stygshore View Post

Now where I think my issue may be... The truck has always seemed to have sort of a trans shutter on long slow slopes. When I got it from the dealer it had big 33" tires on it - but I am not sure they ever adjusted the speedo to the tire size, which seems to me would also mess up shifting?

I am working on 3 different ideas...

1 - Install a Chip Tuner to adjust performance for towing and adjust systems to the larger tires

2 - Put new tires on that are factory sized ( 30" as opposed to current 33"s )

3 - Switching from the factory 3:55 to a 4:10 rear differential or maybe larger to specifically setup for towing
I have a similar truck/trailer combo. I'm assuming you have the 5.4 liter? Gas mileage is a lost cause when you are towing a big square box behind you. Our first long trip with the Roo 3 years ago was 2800 miles with near $4 a gallon gas. Would have been cheaper to fly! But that wasn't really the point of the trip... Anyhow 7.5 mpg towing the Roo has been common for us even though I never tow over 65mph.

Not sure what exactly you mean about the tranny issue. With this engine (and most other gassers) you need fairly high rpms to get the max torque, so on the hills it revs pretty high (and kills you mpg). Mine sometimes hunts a little on hills as it downshifts but doesn't like to stay in the lower gears. Locking out the O/D doesn't really do anything for that issue.

A tuner might help you change shift points if that's the main issue. Going back to factory size tires might also help - but if you don't need new tires that's kind of an expensive guess. I definitely wouldn't invest the money in changing the gear ratio.

Before spending any real money though, I would try just letting it run at higher rpms on the hill. Sounds a little un-nerving, but my gage red lines at like 8,000 and I've found 3500 to maybe 4000 rpms on the hills keeps it from constantly up shifting/downshifting.

Congrats on the new Roo, btw.
__________________


2017 F-250
2013 Rockwood Roo 23 IKSS
KMP44 is offline   Reply With Quote
Old 04-28-2016, 12:34 PM   #6
Dr Travel
 
Join Date: Apr 2015
Location: Full timers
Posts: 105
Amazing. I tow a fifth wheel 8280WS with my F150 and a 3.73 rear end ecoboost. Getting 10.5 mpg keeping it at 60 - 62 mph. That's my average with a 2014 truck and towing about 8,000 miles.
__________________
robsshots is offline   Reply With Quote
Old 04-28-2016, 12:35 PM   #7
Senior Member
 
Join Date: Feb 2015
Posts: 219
How large is your gas tank? You should figure roughly 10.5 to 11 mpg. If your tank is 22-24 gallons that's about normal consumption.
__________________
stantyszka is offline   Reply With Quote
Old 04-28-2016, 12:36 PM   #8
Senior Member
 
ccsvolsfan's Avatar
 
Join Date: Sep 2015
Location: Tennessee
Posts: 250
That's why I traded the f150 for a low milage f350. Of course that led to buying a fiver. The f150 5.4 just isn't a great truck for the trailer you are pulling. Hill country will take a heavy toll.
__________________
ccsvolsfan is offline   Reply With Quote
Old 04-28-2016, 12:40 PM   #9
Member
 
Join Date: Mar 2016
Posts: 38
I calculated roughly 5 MPG on this trip to and from the dealer - I run around town at about 12-13 in the limited driving I currently do in the truck ( work from home, drive wife's car as a family 90% of the time )

Currently at 65 mph the RPMs level out and aren't constantly shifting up and down and we are running about 3300 RPMs on the flats <- This seems high to me for a truck that runs 1800-2000 without towing and about 2200 towing a 12' box Coachman Pop-up camper( 3200 loaded ) prior to the Shamrock.

My tires themselves are 3" bigger than the stock tires 285 vs 255 70/r17s.

The dealer said the adjustment to tire size to speedo probably wont do much, but putting the factory tires back on or changing the rear differential will help a lot ( he was happy to sell me new tires or another truck if I wanted one as well )

Tuner shop said that tire size adjustment and tuning to tow may fix the stuttering and up/shift downshift on long slopes, and may keep it in a set gear more efficiently, but admitted if you are buying a tuner for better gas mileage, you would be better off just putting that money into your gas tank.

Kind of at a loss and starting to shop F250's locally in case I can get a $30 more a month car payment to save $100.00 a month in gas. ( we have at least 1 long or 2 short trips booked for the remainder of camping weather this year )

Styg
__________________
Stygshore is offline   Reply With Quote
Old 04-28-2016, 12:44 PM   #10
Member
 
Join Date: Mar 2016
Posts: 38
Quote:
Originally Posted by ccsvolsfan View Post
That's why I traded the f150 for a low mileage f350. Of course that led to buying a fiver. The f150 5.4 just isn't a great truck for the trailer you are pulling. Hill country will take a heavy toll.
In-laws live in Rapid City SD in the Black Hills... already nixed the idea of dragging the trailer out that direction. I remember an overloaded trip with a U-haul back to Michigan getting about 4mpg in the hills with only a 19' box.


Styg
__________________

__________________
Stygshore is offline   Reply With Quote
Reply

Tags
23ss, hybrid, towing

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



» Virginia Campgrounds

Reviews provided by




ForestRiverForums.com is not in any way associated with Forest River, Inc. or its associated RV manufacturing divisions.


Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -5. The time now is 06:06 PM.