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^^^^^ Yep sure is a whole nuther world compared to what I'm running now. With an entirely different gear spread and slip of the torque converter of the transmission coupled with the larger RPM range and flatter torque curve of the motor 'tis a whole new beast. Can't wait to see how it performs unloaded and with 9 or 10K of trailer behind it.
^^^^^ Yep sure is a whole nuther world compared to what I'm running now. With an entirely different gear spread and slip of the torque converter of the transmission coupled with the larger RPM range and flatter torque curve of the motor 'tis a whole new beast. Can't wait to see how it performs unloaded and with 9 or 10K of trailer behind it.ZF 6 SPEED RATIOS
So many of you guys are telling the OP to push the pedal harder, or use manual gearing. If you read his original post...he's got the pedal to the floor and he's tried manual gearing. Nevertheless, it still doesn't maintain speed as well as his previous GMC. I'd note that this echoes the comparison test TFL Truck did in the rockies pulling a max load...the GMC did best, RAM second, Ford third...despite best torque or horsepower. This truck was a 4.10 dually. BUT...because of GM's lower towing limits, they were all towing at the GM's max...but under the max for Ford and RAM. I'm thinking with an even heavier trailer, Ford would have done best because everyone would have to be slower and the Ford engine would be in the sweet spot with gearing.
Excellent points on the test results --- I'm in a holding pattern on next new vehicle. Won't touch the Ford Made in Mexico 6.7L (I'm disgusted with Mexico's drug activities) and waiting to see what the new GMCs (coming out later this year) have to offer. GM has put loads of dollars into this new product and I'd like to see how it performs before shelling out serious money.
troverman -- noticed the new Duramax (towing scenario w/12,500lb load) was also delivering about 20% better fuel economy than the Made in Mexico 6.7L per TFL's tests..............
After reading all this if it were me I would stop by my Ford dealer or find someone with a dyno. I would want to confirm the engine is putting down the power its designed to produce. If not that could be your issue. With all the regen crap on these trucks now anything could be off causing your problem. Lastly, didn’t your Dmax have the 7 speed tranny? That also helps keep RPM’s in the sweet spot. The super duty’s currently have 6 speeds but the 2020’s will have 10 speeds that should offer a big improvement.
Msmith1968, did you ever take your truck into the dealer?
My F-350 with 6.7L pulls only 11K through the Rocky Mountains. I've never had a problem getting up the "hills". I point it uphill and turn it loose. I can pass people if I need to. Add 5K to my load? I could see it slowing the truck down.
Maybe a regen is taking place?
The discussion of gear ratio and RPM is interesting. What was the optimal RPM zone for the 6.7L?
At 26,400# GCW, I can hold 65 MPH up mountains with my stock 2017 F450. Sidling hill is the biggest 6% mile+ climb in MD, and my rig has no problems with it. I'm WOT during the pull, but can hold 65-70 MPH. If you cannot hold 65 MPH towing 15k on 4%-6% hills, something's wrong.
troverman -- noticed the new Duramax (towing scenario w/12,500lb load) was also delivering about 20% better fuel economy than the Made in Mexico 6.7L per TFL's tests..............
It does seem the Duramax does well on fuel, but being perfectly honest TFL's method of calculating fuel economy is not scientific and even minor deviations can result in a fairly significant fuel economy differences.
I don't like the fact that the Powerstroke is made in MX...there is no reason for it. In fact, there are many parts on the Super Duty made in MX, and China. Although the Duramax is made in the US, I bet you'd find many foreign components in those vehicles as well. I'm hoping Trump squeezes everyone enough to bring more production back stateside.
My 2016 GMC 3500 Denali was totaled a couple weeks ago. I was forced to go out and buy a new truck. Decided to move to the Ford because of all the technology and power these tricks put out. Purchased a 2018 CCLB SRW Platinum. Love the truck, rides well, feels strong, looks good.
Yestersay I pulled my 15k Solitude 5th Wheel over the I-70 mountain range in Colorado and I was not very impressed. It seemed like the truck was hunting for gears, with no throttle left to get up these hills any faster then about 35-40 mph. I started using manual transmission control to keep it on a lower gear to get power but the truck just seemed to struggle. I know your can’t race up hills with this weight but I expected to be able to maintain 60 mph on a 4-6% grade. It also kept shifting into 4th gear while on flat road going 68 mph, again like it was struggling to keep up or find the right gear. It was somewhat windy so I’ll give that some latitude Honestly, My old GMC pulled up these hills doing 65 no problem. Is there anyway to get more throttle response out of this truck or possible change gears. Any thoughts. Other than this I reallly do enjoy the truck.
Thanks.
Mike.
In all the test I have seen this is a common problem with the Ford on this freeway. Not sure if the truck is not getting the air it needs to make the power it should because of tuning or way the air box is engineered and it cant pull in the air needed. It is hard to say but would be nice to know exactly what the deal it but you know Ford will never respond on why it is doing what it is. It seems at lower altitudes the Ford 6.7 is on par with the new duramax so it is making good power. They do say torque management is at play on SRW trucks to through 3rd. and DRW only 1st. Gm when the current engine was relised said they only limit in 1st. Personally a owner of a 17 6.7 I have a problem if ford is pulling power and should not be as the truck then does not perform as it rely should and can. It would be nice if someone could get real answers on this! There has to be a Ford engineer on here or someone that know one or some!
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