Towing To The Max - Ram 1500 Diesel Forum
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post #1 of 19 Old 01-08-2015, 12:30 AM Thread Starter
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Towing To The Max

I found the truck I like but the axel ratio puts me right at the maximum tow limit for my boat. if the truck has an eight speed transmission can't you just drop down a gear or two in the manual shift mode? anyone out there pushing their tow limit to the max?
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post #2 of 19 Old 01-08-2015, 05:35 AM
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Plenty of people are. But its not the engine or trans that cant handle the weight. Its other factors like Axle, suspension, etc.
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post #3 of 19 Old 01-08-2015, 08:37 AM
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Plenty of people are. But its not the engine or trans that cant handle the weight. Its other factors like Axle, suspension, etc.
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Plenty of people are. But its not the engine or trans that cant handle the weight. Its other factors like Axle, suspension, etc.
Matty,

I am still confused as to why the exact same half ton with a hemi has a large increase in both payload and towing. Same brakes, same frame, same tranny, same rear end (don't think you can get the 3.55 ratio in the hemi) & same suspension.....the absolute only difference is the engine and exhaust. Granted the ecodiesel is down on h.p., but makes more torque (not to mention more useable torque). It doesn't make sense to me why the ratings are lower.

Heck a hemi set up the same as my ecodiesel only difference is gear ratio ( I have 3.55 / hemi set up with 3.21, & for those that don't know, 3.55s are better for towing than the 3.21 in this comparison. ...so the 3.55 truck you would think has the edge in this comparison) the hemi has a better max towing and payload. Now the only thing I haven't found so far is weight differences between the engines. But even if the diesel weighs a couple hundred pounds more, there is still a larger gap in the capacities.

I'm not buying the derated numbers for this truck until someone can give me a clear answer.
Hope this didn't sound too abrasive. ...and I'm not targeting you matty, I just want some answer that actually gives a reason why there is a large gap in capacities.
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post #4 of 19 Old 01-08-2015, 10:18 AM
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The acceptance of the new sae rating system has been a game changer for us. Now, a great deal of weight is given to performance rather than the structural failure point of the overall system. The Ed is is being seriously penalized for lack of neck snapping acceleration ability. Discounting a drag race up Davis dam, I think the capabilities are far higher than the ratings indicate.

Here are the main test methods trucks are now measured on as per J2807:

Cooling capability on a long highway upgrade modeled on the Davis Dam grade on Arizona SR 68;
Launch and acceleration performance on a level road and a 12 percent upgrade;
Combined handling performance – understeer and trailer sway;
Combined braking performance – stopping distance and parking brake-hold on grade; and
Structural performance for the vehicle and hitch or hitch receiver.
New calculations for trailer weight ratings: In addition to the performance standards, SAE J2807 also uses a specific set of assumptions to calculate maximum trailer weight ratings:

For light-duty full-size pickups (GVWR < 8,500 lbs.), SAE J2807 assumes that the tow vehicle includes any options with higher than 33 percent penetration;
It assumes there is both a driver and passenger in the vehicle, each weighing 150 pounds;
It assumes that tow vehicles also include up to 70 pounds of aftermarket hitch equipment (where applicable); and
For conventional trailer towing, SAE J2807 assumes that 10 percent of the trailer weight is on the tongue."

Ram 1500 ecodiesel
Longhorn cc lb 4x4

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post #5 of 19 Old 01-08-2015, 10:49 AM
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Originally Posted by jimmyn View Post
I found the truck I like but the axel ratio puts me right at the maximum tow limit for my boat. if the truck has an eight speed transmission can't you just drop down a gear or two in the manual shift mode? anyone out there pushing their tow limit to the max?
And then some! There's a recent "towing heavy" thread on the other forum that has some pretty surprising accounts; short tows with an 18000# dump trailer, a 600 mile trip towing 9400# with 3 adults & trappings. This was on a limited with 355's. A couple of car haulers in the 8000# range. All reports were with totally satisfactory results. I wouldn't be the least bit deterred if you don't exceed axle ratings.
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post #6 of 19 Old 01-08-2015, 11:52 AM
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The acceptance of the new sae rating system has been a game changer for us. Now, a great deal of weight is given to performance rather than the structural failure point of the overall system. The Ed is is being seriously penalized for lack of neck snapping acceleration ability. Discounting a drag race up Davis dam, I think the capabilities are far higher than the ratings indicate.

Here are the main test methods trucks are now measured on as per J2807:

Cooling capability on a long highway upgrade modeled on the Davis Dam grade on Arizona SR 68;
Launch and acceleration performance on a level road and a 12 percent upgrade;
Combined handling performance – understeer and trailer sway;
Combined braking performance – stopping distance and parking brake-hold on grade; and
Structural performance for the vehicle and hitch or hitch receiver.
New calculations for trailer weight ratings: In addition to the performance standards, SAE J2807 also uses a specific set of assumptions to calculate maximum trailer weight ratings:

For light-duty full-size pickups (GVWR < 8,500 lbs.), SAE J2807 assumes that the tow vehicle includes any options with higher than 33 percent penetration;
It assumes there is both a driver and passenger in the vehicle, each weighing 150 pounds;
It assumes that tow vehicles also include up to 70 pounds of aftermarket hitch equipment (where applicable); and
For conventional trailer towing, SAE J2807 assumes that 10 percent of the trailer weight is on the tongue."

Ram 1500 ecodiesel
Longhorn cc lb 4x4
Thanks for the response. That is a good explanation of why the ratings are lower.
A good friend of mine was asking about my ed as he has a 5 year old hemi and looking at the ed. I have owned hemi s and I flat out told him there is no comparison in throttle dropping performance. The hemi would leave the ed in the dust.....but I don't drag race my truck. It had plenty motor to get itself moving, and fuel mileage that his hemi could only dream about.!

So it sounds as if that's why the hemi has an Edge on towing. .....thanks again!
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post #7 of 19 Old 01-08-2015, 02:37 PM Thread Starter
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Thanks so much to all that replied. I had a feeling it's a semi complex formula used when rating a trucks towing cap.
I'm rebuilding a 25' 7500 lb. boat/trailer. The truck I'm looking at is a limited edition 4X4 fully loaded but the rear end is 355. what if I had to change the gearing? because it's 4X would the front have to be changed as well? 99% of my towing will be relatively flat with the exception of a quarter mile 7% grade (for now). the thing that I fear, is after dropping two times more $ than any other vehicle in my life I don't like the way it tows.
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post #8 of 19 Old 01-08-2015, 03:51 PM
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it's discussions like this that make me think truck makers need to provide more extensive information on what towing is like with it's vehicles, information like that speeds up someones buying decision, an important fact for the many truck brands out there.
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post #9 of 19 Old 01-08-2015, 03:56 PM
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I wouldn't entertain changing rears. If it's even possible, the cost would probably be prohibitive. You're at a big advantage pulling a boat rather than a wind sail of a trailer. Most likely, your concerns aren't founded. The Ed isn't going to give you hotrod acceleration but will be adequate for normal driving habits in normal traffic especially on flat land. You may find an isolated negative towing report somewhere but 99% of owners towing have been well satisfied with their results. You're on the right track in you're op; if you find performance a little sluggish, the tow/haul mode will hold shifts a little longer & down shift a little quicker, although most don't find it necessary. I don't know what you're coming from but I can assure you, the European luxury car ergonomics of that beautiful limited & unbelievable fuel economy will quickly earn your forgiveness for not yanking that boat around like a fuel guzzling hd truck!! Stop worrying & enjoy your new truck.
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post #10 of 19 Old 01-09-2015, 11:36 AM
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Just some suggestions:


Put Better (e-rated) Tires on you ED and run MORE PSI.


Upgrade your brake pads and maybe rotors.


Get a computer flash from www.GreenDieselEngineering.com for added power and better shifting. They are very experienced with VM Motori Diesels.


Get a good Weight Distributing Hitch system to balance truck and trailer.


Get rid of any extra weight items you DON'T NEED.


None of these things will officially change your vehicles GVWR but...
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