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Old 07-20-2012, 03:47 PM   #31
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Quote:
Originally Posted by dhdad

When it comes to towing torque is more important than HP, especially low end torque and you can't beat a diesel.
This isn't entirely true. Horse Power is purely a calculated value based upon rpm and torque.

HP = (rpm * T) / 5252

While we can all agree that torque off idle is great for towing, once you're moving HP plays a larger role. Your RPMs for a given speed are determined by gear ratio. The rpm range on a diesel engine "usually" isn't as broad as that of a comparable gas engine.

Even an almighty diesel truck has to downshift to keep in the proper power band when the downshift wouldn't put it above its maximum rpm range.

My '06 Cummins was bad about this. I had a 6" lift, 37s, and stock 3.73s in it. It turned around 1600 rpm at 70 mph where stock was around 2100 for the same speed. Stock, it would chug up hills towing with no problems, but lifted it would downshift and turn about 3K RPMs. Why? Because it was programmed to do so.

Running an engine within its allowable rpm range is perfectly acceptable. Those of you scared to rev an engine for power must not own a boat. If you did, you'd be use to running your motor at mid to high rpm all the time. Mines got a 350 MAG and I run it at 4K rpm all day long and 5.2K often. If I stayed at 2K, I'd never get up on plane.

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Old 07-21-2012, 09:17 AM   #32
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Nice things about boats is they've got access to unlimited cooling, these Jeep engines will get real hot real quick if you run them too high in the RPM range for long. When my wife's '07 Rubicon downshifts going up a hill on the highway I always cringe, maybe the 5 speed auto is better with closer gear ratio.

My Duramax has stock 3.73 with 33" tires, the Allison Tranny is an adaptive tranny so shifting is fine coming from the stupid GMC 30" stock tires. Never experienced a downshifting issue that I've noticed but my tranny is a 6 spd too. I just hauled 7K on vacation all last week and it was fine. 37" tires is a bit much for a tow vehicle, these heavy diesels do not make for good offroad vehicles anyways, lifting too high with real big tires is mostly for looks.

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Old 07-21-2012, 11:36 AM   #33
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Originally Posted by bohunter1 View Post
Hey guys! Im new to this forum & also just purchased my first jeep. I traded in my 09 silverado, and bought a 2011 jeep wrangler sport. So far love it, no regrets!
My question is, im thinking of purchasing a 99 18ft lund fisherman. My jeep has a max towing @ 2000 lbs, the boat i want weighs in around 2500 lbs...with no brake system
i know the jeep will tow the boat, but what is your take on the stopping???
What do u also think on getting in and out of a boat launch??
Any feed back would be great!! Thanks!!
Wouldn't worry too much about the weight, but would like to have some braking like a surge system on the trailer. A lot of this depends on distance towing, your speed and the terrain, so I wouldn't be speeding down the Rockies off of 10K foot passes for hundreds of miles as a matter of habit.
We tow our Jeep behind our MotorHome that is above the limits, but have good braking and keep our speed down at all times. Still haven't tested it in the mountains, but does great on the flatlands so far.
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Old 07-21-2012, 05:55 PM   #34
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I always lol'd at this picture that was in the Jeep Brochure for ages.. with a 3500 lb tow rating.. There is no way that CJ on a car hauler weighs 3500lbs or less...

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Old 06-28-2014, 10:14 AM   #35
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Quote:
Originally Posted by bohunter1 View Post
Hey guys! Im new to this forum & also just purchased my first jeep. I traded in my 09 silverado, and bought a 2011 jeep wrangler sport. So far love it, no regrets!
My question is, im thinking of purchasing a 99 18ft lund fisherman. My jeep has a max towing @ 2000 lbs, the boat i want weighs in around 2500 lbs...with no brake system
i know the jeep will tow the boat, but what is your take on the stopping???
What do u also think on getting in and out of a boat launch??
Any feed back would be great!! Thanks!!

I have an '08. My boat and trailer weigh somewhere around 3300. Like you I read this forum and many others only to be either scared to death or placated. It pulled it fine. No issues with braking or swaying. Take your boat out, be careful, and have fun

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