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Open Roads Forum  >  Tow Vehicles

 > 2020 Freightliner vs 3500 GMC Dually at the Ike

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FishOnOne

The Great State of Texas

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Posted: 09/07/19 07:12am Link  |  Quote  |  Print  |  Notify Moderator

Interesting outcome...

Trailer: 18,500 lbs

GMC
Engine: 6.6 Duramax
Brake Applications: 1
Time: 10:28

Freightliner
Engine: 9.0 Cummins
Brake Applications: 0
Time: 10:42

Link


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4x4ord

Alberta

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Posted: 09/07/19 08:54am Link  |  Quote  |  Print  |  Notify Moderator

Measuring the time required to tow a trailer up a hill is an accurate method of measuring rear wheel hp. It surprises me that the GM didnt smoke the Freightliner.


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bguy

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Posted: 09/07/19 09:32am Link  |  Quote  |  Print  |  Notify Moderator

What percentage of each vehicles towing capacity is the trailer at that weight?


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midwest

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Posted: 09/07/19 09:52am Link  |  Quote  |  Print  |  Notify Moderator

bguy wrote:

What percentage of each vehicles towing capacity is the trailer at that weight?


And how close is each to the rear axle weight rating ? This is a perfect example that "payload" is primarily a registration class derived number. This Freightliner is likely capable of being registered up to class six.

4x4ord

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Posted: 09/07/19 10:40am Link  |  Quote  |  Print  |  Notify Moderator

They praise the performance of the engine brake on the Freightliner over the performance of the exhaust brake on the GMC, however, if more weight had been loaded into the trailer the Duramax would have held 50 mph yet the Freightliner would have required additional brake applications. Comparing two trucks on one hill with only one weight in tow doesn't really offer an honest comparison. I'm having trouble understanding why the GM slowed down as much as it did going up the hill ..... something doesn't add up. Even back in 2015 (with 396 HP and 765 lb ft) the Duramax towed 19000 lbs up the Ike in just under 10 minutes. link

* This post was edited 09/07/19 10:52am by 4x4ord *

Grit dog

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Posted: 09/07/19 10:42am Link  |  Quote  |  Print  |  Notify Moderator

Duramax FTW!!!


"Yes Sir, Oct 10 1888, Those poor school children froze to death in their tracks. They did not even find them until Spring. Especially hard hit were the ones who had to trek uphill to school both ways, with no shoes." -Bert A.

noteven

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Posted: 09/07/19 10:43am Link  |  Quote  |  Print  |  Notify Moderator

Anyone know what the gross weight of each combination was?

Also when the pickup goes into downshift run to the governor upshift nope can’t pull it downshift try again upshift nope can’t pull it mode why not select the lower gear and let it pull near its max power rating, like a truck driver does it?

* This post was edited 09/07/19 10:55am by noteven *

Grit dog

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Posted: 09/07/19 10:44am Link  |  Quote  |  Print  |  Notify Moderator

4x4ord wrote:

They praise the performance of the engine brake on the Freightliner over the performance of the exhaust brake on the GMC, however, if more weight had been loaded into the trailer the Duramax would have held 50 mph yet the Freightliner would have required additional brake applications. Comparing two trucks on one hill with only one weight in tow doesn't really offer an honest comparison. I'm having trouble understanding why the GM slowed down as much as it did going up the hill ..... something doesn't add up. Even back in 2015 (with 396 HP) the Duramax towed 19000 lbs up the Ike in just under 10 minutes. link


**** man....that new Dirtymax driver is a sand baggin bisnatch then! He must have stock in Freightliner!

ShinerBock

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Posted: 09/07/19 11:11am Link  |  Quote  |  Print  |  Notify Moderator

Looks to me that the GM de-fueled and/or ****** timing (cutting power) because EGT's were probably getting too hot. Big difference between initial power and sustained power.

The GM's 445 horsepower is barely sustainable towing that heavy of a load with a stock turbo in a deleted truck without getting the EGT's too high so I doubt an emissions intact truck can sustain that. It would have to de-fuel/****** timing to keep the EGT's in check.

* This post was edited 09/07/19 11:33am by ShinerBock *

4x4ord

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Posted: 09/07/19 11:31am Link  |  Quote  |  Print  |  Notify Moderator

ShinerBock wrote:

Looks to me that the GM de-fueled (cutting power) because EGT's were probably getting too hot. Big difference between initial power and sustained power.

The GM's 445 horsepower is barely sustainable towing that heavy of a load with a stock turbo in a deleted truck without getting the EGT's too high so I doubt an emissions intact truck can sustain that. It would have to de-fuel to keep the EGT's in check.


You may be right but isn't it surprising that the 2015 Duramax out performs the 2017? I would have thought the turbo on the 2017 would pump more air and be capable of higher power with lower EGTs.

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