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Old 03-24-2022, 02:06 AM   #1
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Brand: Thor Motor Coach
Model: Omni XG32
State: Arizona
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More Power Scotty !!

I'm curious to learn if others in the Omni/Magnitude family running the 6.7 Powerstroke with 10 speed tranny have found their rig unable to maintain
speed while climbing a 6% or greater grade.
My 2021 xg32 near its max payload and flat towing a Wrangler Unlimited starts losing speed while climbing long 6% grades. I'm using tow/haul and the tranny will downshift to 8 but speed degrades from 65 to 56 - 58 with my foot on the floor. Its not terrible but I'm wondering if its typical

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Old 03-24-2022, 03:08 AM   #2
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Originally Posted by Lamokadave View Post
I'm curious to learn if others in the Omni/Magnitude family running the 6.7 Powerstroke with 10 speed tranny have found their rig unable to maintain
speed while climbing a 6% or greater grade.
My 2021 xg32 near its max payload and flat towing a Wrangler Unlimited starts losing speed while climbing long 6% grades. I'm using tow/haul and the tranny will downshift to 8 but speed degrades from 65 to 56 - 58 with my foot on the floor. Its not terrible but I'm wondering if its typical

how much does your rig weigh?



thats a big BOX on the 550 chassis 6% grade is going to take a toll and downshift



gvwr is 19,000 and some change right?
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Old 03-24-2022, 11:26 AM   #3
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I have a 2020 SV34 on a 2019 F-550 so it has the 6-Speed transmission. I also pull a Wrangler.

My coach is heavier than yours and as I recall last year going through the Rockies I was around 60MPH on those grades.
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Old 03-24-2022, 12:45 PM   #4
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If you can maintain 55+ with that GCWR steady state, then I'd say your looking good. One thing I have noticed is that a down shift out of OD or manual throttle before the cruise kicks out works better. Anticipate the grade and get it in the correct sweet spot power band before the speed loss. It is difficult to get it back or keep it stated state once you loss it.
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Old 03-24-2022, 12:54 PM   #5
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Originally Posted by Lamokadave View Post
I'm curious to learn if others in the Omni/Magnitude family running the 6.7 Powerstroke with 10 speed tranny have found their rig unable to maintain
speed while climbing a 6% or greater grade.
My 2021 xg32 near its max payload and flat towing a Wrangler Unlimited starts losing speed while climbing long 6% grades. I'm using tow/haul and the tranny will downshift to 8 but speed degrades from 65 to 56 - 58 with my foot on the floor. Its not terrible but I'm wondering if its typical
That would seem right for me.
Besides the fact that Powerstroke have 1000+ lbft of torque, it "only" has 475 hp of power and to move a bulky/heavy vehicle at high speed you need power (hps).
That is the reason semis go up hill slow even having 2000+ lbft of torque: Because they "only" have 600hp...
If you do some mods and turn your engine into a 1200hp machine, you will climb that mountain at 70mph w/o the need for pedal-to-the-metal
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Old 03-24-2022, 01:52 PM   #6
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Here's an article explaining your situation.

https://www.caranddriver.com/news/a1...2C%20or%20both.
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Old 03-24-2022, 04:05 PM   #7
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Originally Posted by RACarvalho View Post
That would seem right for me.
Besides the fact that Powerstroke have 1000+ lbft of torque, it "only" has 475 hp of power and to move a bulky/heavy vehicle at high speed you need power (hps).
That is the reason semis go up hill slow even having 2000+ lbft of torque: Because they "only" have 600hp...
If you do some mods and turn your engine into a 1200hp machine, you will climb that mountain at 70mph w/o the need for pedal-to-the-metal

Ford rates the F-550 PowerStroke diesel at 330 HP @ 2,600 RPM, and 825 lb-ft @ 2,000 RPM.

Higher power and torque ratings are for lighter pickup trucks. A rig with only 330 HP and combined weight of about 24,000 pounds (guessing 19,500 + 4,500) is going to be somewhat limited in speed on steep uphill grades.

Staying above 55 MPH on 6% grade seems plenty good to me. Iíd be more than happy with that.
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Old 03-24-2022, 04:38 PM   #8
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Staying above 55 MPH on 6% grade seems plenty good to me. Iíd be more than happy with that.
That was an event I faced many times towing a 9000lbs camper with a truck equipped with 400HP/400lbft gas V8:

I travel at 65mph so basically following semis.
When we reach an incline I would lose speed faster than the semis so they would pass me, until the 10spd tranny downshifted to 6th gear and the truck was able to INCREASE speed and get back to 55/60mph when I pass them...
Did that several times in the IKE...
Power/weigh ratio is king in this...
The sound of the gas V8 roaring uphill was nice but don't ask me about fuel consumption...
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Old 03-24-2022, 05:38 PM   #9
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Originally Posted by RACarvalho View Post

.....cut......

Did that several times in the IKE...
Power/weigh ratio is king in this...
The sound of the gas V8 roaring uphill was nice but don't ask me about fuel consumption...

Yes, climbing speed on steep grades is mostly about power-to-weight ratio because at lower speeds aerodynamic drag is ďrelativelyĒ low.

I had similar experience once crossing Continental Divide on I-40 pulling a trailer that was too heavy for the limited engine power. I only had 125 HP per 10,000 combined pounds, but loss about 25% due to elevation. Regardless, on steepest sections some of the 500 HP semi at 80,000 pounds were not able to keep up. I was only doing about 30 MPH in far right lane and stayed behind an even slower semi because I didnít want to block much faster auto traffic if I tried to pass. I would have only saved a minute or two anyway even if I could have gone a bit faster, and to me itís not enough of a delay to worry about. Itís one reason Iím not into all the high-power options. Iíll take whatever yields best fuel efficiency ó within reason.
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Old 03-24-2022, 07:06 PM   #10
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It's not a race... let the semis get to the top of the hill first: they can keep an eye out for speed traps for you!
Look around and enjoy the scenery!
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Old 03-24-2022, 10:37 PM   #11
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It's not a race... let the semis get to the top of the hill first: they can keep an eye out for speed traps for you!

Look around and enjoy the scenery!


X2! Itís a recreational activity and those steep grades are not very frequently encountered.
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Old 03-25-2022, 10:29 PM   #12
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X2! Itís a recreational activity and those steep grades are not very frequently encountered.
If you travel the SW. I'm in AZ, you hit grades pretty much wherever you go
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Old 03-30-2022, 07:33 PM   #13
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We bought our 2020 XG32 in November of 2019 and love it. We tow a Jeeg Cherokee Trailhawk and we don't have a single issue with uphill speed on any grade. We couldn't be happier with our Rig.
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Old 03-30-2022, 09:02 PM   #14
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Also, the air is thinner in the mountains. That doesn't help either!
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