Bushman5 wrote:
I disagree about HP being needed for towing . I drive a tandem axle ten ton truck at work with a Cummins inline 6 diesel grunter under the hood and a pintle hitch.
I've towed more than 50,000 kg up hill (WAY OVER my GVWR). It's the torque not the HP that makes that possible.
The Cummins torque pulls the loads......not the HP
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geordi wrote:
Horsepower is how fast you hit the wall.
Torque is how much of the wall you take with you.
flash7210 wrote:
Torque pulls the load up the mountain.
Horsepower gets it up there quickly.
I wonder how fast a Bugatti Verayon can pull 6000 lbs up a mountain

"Want to run faster? It's all about horsepower! But if you have more torque, you'll have more horsepower!" - Judson Massingill, School of Automotive Machinists
You can disagree all you want, but to do a lot of work in a timely fashion, such as pulling a heavy trailer up a hill at the speed limit like I said earlier, you need HP. HP=Ft-lbs * RPM / 5252. This means you can either make a certain amount of horsepower by making a lot torque at low RPM(like the big diesels) or a little torque at a high RPM(like a honda civic). Ultimately it needs to make hp to get up the hill at a reasonable rate.
I was never arguing the towing characteristics of the motor, obviously I would rather tow with a hot tuned 200hp CRD than 210hp 3.7 V6 Liberty because the CRD has more desirable torque curve, but my point still stands. You will be the guy going 20mph under the speed limit if you put too much weight behind the CRD(or any vehicle with a big enough trailer for that matter). whether or not the jeep make 364 ft-lbs with a hot tune, it still only makes 200hp max.
My whole point was to say that yeah, it could pull 7000 lbs, but so could my self propel lawn mower given enough gearing and time. Doesn't mean its a good idea to pull a 7000 lb trailer with a lawn mower.
thermorex wrote:
Both power and torque are needed for towing. For example, in the silly commercial ford ecoboost has vs Chevy and ram EcoDiesel, they do a drag race on Eisenhower pass with 5 or 6 k lbs. Ecoboost is the fastest. Side the bad mileage and the ecoboost is indeed faster while towing.
Below torque in lbs/ft and hp:
Ecoboost 450 and 365
Ecodiesel 420 and 240
5.7 hemi 375 and 350
Even though EcoDiesel is a better overall half ton for towing due to the fuel efficiency, it does not have enough power to match the ecoboost, even if the torque is somehow close. Now, when talking about Cummins, that 6.7 engine has towards 1000 lbs/ft and 350 hp, so it's more than double the ecoboost has. Normally, it will pull that 6000 lbs trailer like it's not there.
Exactly, but the Ecoboost is also 420. This whole argument came up cause I said the CRD doesnt make alot of HP and therefore doesnt have the ability to tow a heavy trailer up a steep hill and maintain the speed limit. I think thats a reasonable goal. The EcoBoost/EcoDiesel analogy is perfect. They have similar torque curves below 2500 rpm, both at 420 ft lbs, but the ecoboost's torque curve stays pretty flat out to 5500 rpm so it makes substantially more horsepower. It can climb the Ike Gaunlet with a 11,000 lb + trailer and exceed the speed limit in the process.