Travlingman
Jonesborough, TN
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Joined: 10/16/2003
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Good Sam RV Club Member
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Duramax Dyno
2017 F-350 King Ranch DRW
2014 Landmark Savannah(sold)
2022 DRV Mobile Suite 40KSSB4
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FishOnOne
The Great State of Texas
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Joined: 02/12/2011
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Impressive... Next would like to see if there's been a fuel economy improvement.
'12 Ford Super Duty FX4 ELD CC 6.7 PSD 400HP 800ft/lbs "270k Miles"
'16 Sprinter 319MKS "Wide Body"
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Huntindog
Phoenix AZ
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Joined: 04/08/2002
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FishOnOne wrote:Impressive... Next would like to see if there's been a fuel economy improvement. Now you are being funny. More power,towing and better economy do not go together.
Speed costs money.
How fast do you want to go?
Huntindog
100% boondocking
2021 Grand Design Momentum 398M
2 bathrooms, no waiting
104 gal grey, 104 black,158 fresh
FullBodyPaint, 3,8Kaxles, DiscBrakes
17.5LRH commercial tires
1860watts solar,800 AH Battleborn batterys
2020 Silverado HighCountry CC DA 4X4 DRW
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4x4ord
Alberta
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Joined: 12/23/2010
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It would have been interesting to see what happens to the torque had they used manual mode and left it locked in 7th as it pulled down to 1800 rpm. It’s possible, even likely, that peak torque is achieved by 1800 rpm and the torque curve is flat from 1800 to 2000 or 2100 rpm.
It’s interesting that 420 peak rear wheel HP is obtained at 2800 rpm which is about 89% of the engine’s rated hp. (Indicating an 89% driveline efficiency) At 2150 rpm the truck is putting down 899 lbft of torque. If you use the same drive line efficiency of 89% the crankshaft torque would be 1010 lbft of torque at 2150 rpm. The engine is only rated to put out a peak torque of 975 lbft and that is at 1800 rpm.
2022 F350 SRW Platinum short box 4x4.
B&W Companion
2008 Citation Platinum XL 34.5
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Grit dog
Black Diamond, WA
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^It does appear to be a bit of an overachiever.
2016 Ram 2500, MotorOps.ca EFIlive tuned, 5” turbo back, 6" lift on 37s
2017 Heartland Torque T29 - Sold.
Couple of Arctic Fox TCs - Sold
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mkirsch
Rochester, NY
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Joined: 04/09/2004
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Huntindog wrote:More power,towing and better economy do not go together.
Sure it does. Gale Banks and all those other tuner makers did it all the time. Turn the knob one way for more power and towing. Turn the knob the other way for better economy.
The truck's computer is sensing load and control input. It should be able to "turn the knob" automatically in this day and age.
Putting 10-ply tires on half ton trucks since aught-four.
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Huntindog
Phoenix AZ
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Joined: 04/08/2002
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mkirsch wrote:Huntindog wrote:More power,towing and better economy do not go together.
Sure it does. Gale Banks and all those other tuner makers did it all the time. Turn the knob one way for more power and towing. Turn the knob the other way for better economy.
The truck's computer is sensing load and control input. It should be able to "turn the knob" automatically in this day and age. Read it again. The three do not do togther. When you turn your knob, the more power goes away. Hence, the 3 do not go together.
My old boss was admiring my truck. He asked what kind of MPGs it got. I told him I do not know about empty, as it has 21K hitched up 99% of the time. I do not care what it gets empty. I bought it for a reason. To tow my RV.
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Grit dog
Black Diamond, WA
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Fwiw, many tunes get equal or better unloaded mileage in the higher power levels.
And all vehicles since the beginning of time have adjust on the fly power and fuel consumption ability.
It’s the small pedal on the right. Down is more power and more fuel. Up is less of both! Lol
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blt2ski
Kirkland, Wa
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Joined: 03/15/2001
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ford4x
im not too surprised by the more torque at the rear wheels than flywheel. I've seen it a couple times with GM before. Dodge has done it frequently. Im not recalling this happening with Ford diesel's.
HP being down 10-15% is pretty common for all three brands I mentioned.
Marty
92 Navistar dump truck, 7.3L 7 sp, 4.33 gears with a Detroit no spin
2014 Chevy 1500 Dual cab 4x4
92 Red-e-haul 12K equipment trailer
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Huntindog
Phoenix AZ
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Joined: 04/08/2002
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4x4ord wrote:It would have been interesting to see what happens to the torque had they used manual mode and left it locked in 7th as it pulled down to 1800 rpm. It’s possible, even likely, that peak torque is achieved by 1800 rpm and the torque curve is flat from 1800 to 2000 or 2100 rpm.
It’s interesting that 420 peak rear wheel HP is obtained at 2800 rpm which is about 89% of the engine’s rated hp. (Indicating an 89% driveline efficiency) At 2150 rpm the truck is putting down 899 lbft of torque. If you use the same drive line efficiency of 89% the crankshaft torque would be 1010 lbft of torque at 2150 rpm. The engine is only rated to put out a peak torque of 975 lbft and that is at 1800 rpm. Doesn't TQ get multiplied by the gears?
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