2024 Duramax Dyno

[Travlingman]

Duramax Dyno

[valhalla360]

Huntindog wrote:

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?

Pulling the same trailer at the same speeds on similar routes...you sure can see better efficiency.

You are presuming that if you buy a more powerful truck, you will go faster. Go faster with the old less powerful motor and you will see a drop in efficiency.

Pretty much no one tows with their foot to the floor running at absolute max output, so it's silly to assume people would suddenly do so.

[Huntindog]

FishOnOne wrote:

Huntindog wrote:

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?

Not talking about speed. The '20 Power Stroke received a impressive bump in HP and Torque while improving fuel economy. We also seen dyno tests that demonstrated the advertised HP/Torque were understated from the factory.

I do not remember seeing a milage figure on any of my trucks stickers

[FishOnOne]

Huntindog wrote:

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?

Not talking about speed. The '20 Power Stroke received a impressive bump in HP and Torque while improving fuel economy. We also seen dyno tests that demonstrated the advertised HP/Torque were understated from the factory.

[FishOnOne]

Well looks like the 2024 Duramax yielded 18mpg on winter blend diesel. Probably would yield 19mpg in my neck of the woods on summer blend diesel. Assuming there was no regen during this MPG test.

Link

[4x4ord]

Huntindog wrote:

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?

It does. The dyno numbers are derived from the rear wheel hp and represent crankshaft torque less driveline loss. For instance if the dyno rollers are spinning 1800 rpm when the engine is at 2800 rpm the roller torque would be 1225 lbft when the dyno is indicating 420 rear wheel horsepower. The torque value of 788 lbft that Banks is talking about is based on an engine speed of 2800 rpm though. (1225 roller torque x 1800 roller rpm / 5252 = 420 hp x 5252/ 2800 engine speed = 788 lbft crankshaft torque)

[Huntindog]

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?

[blt2ski]

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

[Grit_dog]

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

[Huntindog]

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.

[mkirsch]

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.

[Grit_dog]

^It does appear to be a bit of an overachiever.

[4x4ord]

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.

[Huntindog]

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?

[FishOnOne]

Impressive... Next would like to see if there's been a fuel economy improvement.