2020 Freightliner vs 3500 GMC Dually at the Ike

Didn't the freightliner manufacture own both trucks and the MD is their own build so was it fixed or not. The bigger truck had to be the best because it had to be and it should. Awesome truck for on road use.
chevman

A few other items to consider.
- The Freightliner is a 500k mile rig, even when hauling heavy weights, and is significantly more money to buy and maintain than the Dmax.
- Also, the M2 would weigh a lot more than the Dmax truck, so the GCW was much lighter for the Dmax.

Interesting outcome though.

Howdy!

When I purchased my 3500 Chevorlet Custom Hauler the uplifted stated he did not get truck and chassis because they are detuned. I went from a 2003 4400 International Custom Hauler to 2018 Chevorlet Duramax/Allison towing a 18,000 lb 44’ Toy Hauler 5er. This new Chevrolet I believes out towed the MDT. I was impressed when I recently towed to in the Smokey Mountains. It did great going up which I m not as concerned with as going down which I felt more comfortable in this truck on the downgrades than in the 4400 international.

“Happy Trails”
Chiefneon

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 and 765 lb ft) the Duramax towed 19000 lbs up the Ike in just under 10 minutes. link

I don't think your statement on the Freightliner is correct. The cruise control was holding it at 50 MPH, most likely had a lot more anchor chain in the chain locker. RAM has this feature also when the EB is in auto. I do not use it because it does not brake until about 3-4 MPH above the CC speed.

4x4ord wrote:

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.

Not really, the 2015 may have had a more conservative tune that did not need to defuel/cut timing to keep EGT's in check. While a larger turbo can help reduce EGT's, there is still the DPF and SCR trapping heat and restricting flow. Outside temps also play a big role in EGT's and sustainable power as well. If the outside temps were a lot cooler with the 2015(which it looks like it was from the snow in the background) than they were in this test with the 2017, then the 2015 could sustain higher power levels without having to de-fuel/pull timing. If you really want to be surprised, the 385 hp 2014 Ram 3500 towed that same trailer that 2015 GM in the link you posted even quicker in 9:38( LINK ).


What a lot of people don't know is that just like a gas engine will pull timing and reduce power if knock is detected, so will a diesel if EGT's or other temps get too high.

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.

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.

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!

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?

Duramax FTW!!!