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Open Roads Forum  >  Tow Vehicles

 > Ram 2500 CTD and GM 2500 Dmax up the Ike.

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rjstractor

Maple Valley, WA

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Posted: 06/14/21 07:35pm Link  |  Quote  |  Print  |  Notify Moderator

sch911 wrote:

Forget the IKE it's a non event. What you want is the real SAE trailer tow grade comparisons. Davis Dam.


Idk, its about the same grade-wise, hot in the summer but no elevation to speak of. Just 3600 feet at the top, which even normally aspirated engines will barely notice. If they could somehow heat the Ike up to over 100 degrees it might get interesting. I've only been through there once or twice but I imagine at that elevation even in the summer it doesn't get super hot.

FishOnOne

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Posted: 06/14/21 08:56pm Link  |  Quote  |  Print  |  Notify Moderator

ShinerBock wrote:

Pretty much a nonevent for both. I wish they would start towing 11-14k 5th wheels up the Ike in these tests. The wind resistance on those would make these trucks struggle a lot more.


Ram 2500 HD Cummins vs Chevy Silverado HD Duramax vs Ike

11K trailer

Up the Hill
GM: 8:00 (perfect run)
Ram: 8:00 (perfect run)

Brake Applications
GM: 1
Ram: 0

Fuel Mileage(computer)
GM: 8.1 mpg
Ram: 8.9 mpg

Fuel Mileage(calculated)
GM: 8.2 mpg
Ram: 9.0 mpg


Fuel economy difference is pretty significant. Flat land towing fuel economy would be interesting.

I suspect the HO cummins fuel economy in the 3500 is probably more on par with the Duramax.


'12 Ford Super Duty FX4 ELD CC 6.7 PSD 400HP 800ft/lbs
"200k Mile Club"
'16 Sprinter 319MKS "Wide Body"


4x4ord

Alberta

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Posted: 06/14/21 09:31pm Link  |  Quote  |  Print  |  Notify Moderator

Cummins12V98 wrote:

Why didn’t they include a Ford??? Stupid not to include.


Ford is in a different league.[emoticon]


2021 F350 SRW Platinum short box 4x4.
B&W Companion
2008 Citation Platinum XL 34.5

Cummins12V98

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Posted: 06/14/21 11:26pm Link  |  Quote  |  Print  |  Notify Moderator

4x4ord wrote:

Cummins12V98 wrote:

Why didn’t they include a Ford??? Stupid not to include.


Ford is in a different league.[emoticon]


That could be taken a couple different ways. [emoticon]


2015 RAM LongHorn 3500 Dually CrewCab 4X4 CUMMINS/AISIN RearAir 385HP/865TQ 4:10's
37,800# GCVWR "Towing Beast"

"HeavyWeight" B&W RVK3600

2016 MobileSuites 39TKSB3 highly "Elited" In the stable

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ShinerBock

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Posted: 06/15/21 06:23am Link  |  Quote  |  Print  |  Notify Moderator

FishOnOne wrote:



Fuel economy difference is pretty significant. Flat land towing fuel economy would be interesting.

I suspect the HO cummins fuel economy in the 3500 is probably more on par with the Duramax.


Possibly. I know if I were going with a new 3500 SRW or DRW, I would go with the standard output version and just do an emissions intact tune on it. Best of both worlds, the higher compression ratio for efficiency and more power from the tune. Not to mention a tunable and faster shifting transmission.

* This post was edited 06/15/21 06:42am by ShinerBock *


2014 Ram 2500 CTD
Highland Ridge Silverstar 378RBS

ShinerBock

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Posted: 06/15/21 06:25am Link  |  Quote  |  Print  |  Notify Moderator

Cummins12V98 wrote:

Why didn’t they include a Ford??? Stupid not to include.


Because they are limited on what trucks they can get and when like all vehicle review sites. They did a video about this and the whole process of attaining review vehicles on their car site.

Bionic Man

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Posted: 06/15/21 01:13pm Link  |  Quote  |  Print  |  Notify Moderator

If the standard output Cummins was able to maintain speed, wouldn't it be reasonable to assume that the HO Cummins would use a similar amount of fuel, as it would not need to make more power to do the same speed?

Honestly I'm surprised these trucks are able to do those speeds up the hill. My 350/800 Cummins won't pull my 12,000 pound 5er eastbound to the tunnel at the speed limit. I'm somewhere between 35-40 MPH at the very top. My best friend's 2013 PSD pulling a very similar trailer is the exact same. Does the higher profile of the RV really make that much of a difference?


2012 RAM 3500 Laramie Longhorn DRW CC 4x4 Max Tow, Cummins HO, 60 gallon RDS aux fuel tank, Reese 18k Elite hitch
2003 Dodge Ram 3500 QC SB 4x4 Cummins HO NV5600 with Smarty JR, Jacobs EB (sold)
2002 Gulf Stream Sea Hawk 29FRB with Honda EV6010

ShinerBock

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Posted: 06/15/21 01:54pm Link  |  Quote  |  Print  |  Notify Moderator

Bionic Man wrote:

If the standard output Cummins was able to maintain speed, wouldn't it be reasonable to assume that the HO Cummins would use a similar amount of fuel, as it would not need to make more power to do the same speed?

Honestly I'm surprised these trucks are able to do those speeds up the hill. My 350/800 Cummins won't pull my 12,000 pound 5er eastbound to the tunnel at the speed limit. I'm somewhere between 35-40 MPH at the very top. My best friend's 2013 PSD pulling a very similar trailer is the exact same. Does the higher profile of the RV really make that much of a difference?


The standard output Cummins has a 17% higher compression ratio than the high output Cummins which should correlate to greater efficiency. And yes, the wind resistance of the higher profile does make that much of a difference which is why said they should start towing 5vers up the Ike instead to make these trucks really work hard.

Cummins12V98

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Posted: 06/15/21 07:05pm Link  |  Quote  |  Print  |  Notify Moderator

14’-3” high and 102” wide. Yup lots of resistance.

Groover

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Posted: 06/16/21 06:29am Link  |  Quote  |  Print  |  Notify Moderator

14-3" high?!

My motorhome is 17" shorter and I have to dodge things with it on back roads fairly often. And that is a LOT of air drag. I don't understand why they don't make low side pickup beds for 5ers so that the front room can be lowered. Every inch counts when you are that high.

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