Ike Gauntlet 2017 3500s DRW 22,800# load
Pretty surprising results Uphill towing 22,800# 1. Chevy Duramax 3.73 axle ratio (445hp/910tq) 10 min 16 sec 2. Ram Cummins 4.10 axle ratio (385hp/900tq) 10 min 28 sec 3. Ford Powerstroke 4.10...
Forum Discussion
Huntindog wrote:4x4ord wrote:No matter. It is a well known fact that 4.10 gears will perform better in towing than 3.73stravelnutz wrote:
Me Again,
DUH! HP is merely a theoretical calculation moniker derived from how fast the TORQUE applied to the drive wheels rotates them thus creating measurable RPM. HP is NOT a direct measurable value! Zero torque = Zero RPM and thus Zero HP could even be calculated. Even 1000 lbs feet torque with zero RPM = zero HP. There is Zero RPM if there's insufficient TORQUE to rotate the wheels. HP is merely a theoretical value calculation, not a measured value!
A "horse" does not have a given pulling or rotational strength value as there are vast differences is sizes and pulling strengths of all the various horses. A given size horse's pulling strength can be actually measured but which horse?
The more FORCE (TORQUE) one applies to wheel shaft, the more RPM's it will turn! No where is the word HP used or even involved to make the wheel turn to any RPM's!
TORQUE and RPM are measurable but NOT HP as it's only a theoretical calculation!
Read the article that meagain posted a link to. Power is the rate of doing work. Neither Rpm nor torque are needed to calculate HP. The formula: HP= torque x rpm/5252 is derived from the definition of horsepower(1 horsepower is the power required to lift 550 lbs 1ft in 1 second). If the formula involving rpm and torque were to be stated accurately it would read HP = torque x rpm x pi/16500.
So obviously, if the DA had 4.10s it would do better.
At one time, the Ram/Cummins was available with 3 different gear ratios, and 3 different tow ratings.
I will leave it up to the math gurus to debate as to why that is.
On this particular hill the Chevy might have been geared right. It started out at 55 mph and averaged about 46 mph so it likely spent a fair amount of time at around 40 mph. With 235/80r17 tires and the 3.73 gears the Duramax would be running 2854 rpm at 40 mph in second gear. If it had had a 4.10 final gear ratio at 40 mph the engine would be turning 2427 rpm in 3rd gear or 3137 in 2nd gear.....In either gear the truck would have slowed down.
Edit: The Ford should have been pretty comfortable at 40 mph with 4.10 final drives. It would have been running in 3rd gear at 2662 Which is pretty close to peak HP.
