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Go Back   Hummer Forums by Elcova > Hummer H2 Discussion Forums > General H2 Discussion

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  #1  
Old 12-12-2004, 04:46 AM
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what is the weak link that accounts for the hummers low towing capacity? Is it based on engine performance, brake size, tire ratings hitch type? What can be done to increase it's ability? I have supercharged so far (plenty of power now, and no more constant shifting going up hills) brakes will be next. I have towed aprox 6500 lbs with no problems, looking to tow aprox 8-8500 lbs
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Old 12-12-2004, 04:46 AM
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what is the weak link that accounts for the hummers low towing capacity? Is it based on engine performance, brake size, tire ratings hitch type? What can be done to increase it's ability? I have supercharged so far (plenty of power now, and no more constant shifting going up hills) brakes will be next. I have towed aprox 6500 lbs with no problems, looking to tow aprox 8-8500 lbs
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Old 12-13-2004, 12:34 AM
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I am not having any problem towing at this point, I can pull up a step incline, and maintain 60mph with no problem, and I don't think a couple thousnd more pounds is going to make that much differnce. what I am looking to find out was what is hummer's reasoning for the lower rating? I know in stock engine form I could not be doing what I am doing now without that constant down and up shifting hapening.So is that stock engines lack of power the reason, or does it have to do with other factors that I should correct to make it safer?
Thanks
here is a picture of the current setup, looking to increase boat size from 28' to 35'
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  #4  
Old 01-19-2005, 11:22 AM
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I would think the GVWR of the trailer is the allowable weight of the trailer itself plus the load.
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  #5  
Old 01-19-2005, 07:43 PM
SpokaneWalt SpokaneWalt is offline
 
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[quote]Originally posted by unaslob:

"the yukon with same engine can tow about 9500 lbs with a curb weight of about 6000 lbs so the engine can pull about 15500 lbs. again not bad

then the h2... can tow 7000 lbs... but only weighs 6800 lbs...so the engine can pull in theory only 13800 lbs... what the hell???

it is not a gearing issue at least in comparison to the yukon both 4.10"

The Yukon XL 2500 only comes with 245/75/16 tires, so a 4.10 in a Hummer H2 (with 34"-35") tires is not a true comparison to a 26" - 28" tall tire on the Yukon XL 2500.

The Yukon XL 2500 is a longer vehicle, with Leaf Springs (vs. the Coil over type on the H2)

The Yukon XL 2500 has a drive train that is quite a bit different - not full time 4x4 or "all wheel drive". A better comparison, drive train wise, would be to a Yukon Denali, as it has "All wheel Drive," and a Coil Spring type rear suspension. Basically the same engine and a "similiar drive train" (The Denali has no 4 Lo capability, no factory "locker," etc)

The max towing for the Yukon Denali or Denali XL is 8000 Lbs (+/-100), but the Max gross vehilce weight for the Yukon Denalis is around 7000 lbs vs 8600 for the H2. The "Vehicle Cargo" capacity for the H2 is 2200 lbs vs. about 1500 for the Yukon Denali. The denali has 3.73 rear end, which is closer to the H2 4.10 when you account for tire height.

So it is a give some here take some there and you get around the same max combined weight rating for both.

There are a bunch of other factors that probably reduce towing capacity for the H2- tow hitch height, sidewall stiffness of the tires, weight rating of the tires, gear ratio effects of tire height, etc.

Remember- it is a "rating" or "number" - the other GM SUVs (Yukon and Suburban types) have competing vehicles from other mfgs, which may cause the towing numbers to be a slight bit over-rated. The H2 has no equal from Ford, Dodge or any foreign make. So it may have a bit more "safety factor" built into the numbers. GM / AM General has no reason to bump the numbers up 500lbs or so for comparison reasons. My opinion is that the Suburban and Yukon XL 2500 are over-rated and and puching them to the max weights is too much for the vehicles (definetly too much for the factory receiver hitch - but that is another topic...)

Last, there was an issue with "cooling" for the trans, etc - and I would say that the cooling capability is comparable and fairly good from the factory on all vehilces mentioned.

Just my 2 cents (I am new to the board - looking to buy an H2 soon)

I am very familiar with the Tahoe/Suburban/Yukon/Yukon XL products.
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  #6  
Old 12-12-2004, 07:52 PM
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what i've done is get a small girlfriend. Seems to help......LOL. Have you tried to keep it in 3rd or 2nd when climbing?
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  #7  
Old 01-19-2005, 06:09 PM
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While I don't want to endorse everyone to pull a load over the suggested weight ratings, keep in mind that what comes from GM is a suggested weight rating based what they feel is a relatively worse case scenario. It is not in terms of max weight ratings.

There are many factors that go into their ratings, some of which has nothing to do with the vehicles ability to safely tow the trailer. They obviously have to stay way on the safe side to limit their liability.

Also, it is my opinion, that if you have the air suspension, you can safely tow up to the rating given for use with a weight-distrubition hitch. GM is providing the rating based on a coil suspended rear end, not with the air.

To opine on your question, JMV1210, your trailer probably weighs about 2500lbs empty. Meaning, on your trailer you should be safe by adding about 4500lbs of cargo. The trailer you have should be well-matched for your H2. I have a trailer similar and it is a smooth and easy pull with the H2.
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  #8  
Old 01-13-2005, 03:03 AM
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<BLOCKQUOTE class="ip-ubbcode-quote"><font size="-1">quote:</font><HR>Originally posted by Don:
I am not having any problem towing at this point, I can pull up a step incline, and maintain 60mph with no problem, and I don't think a couple thousnd more pounds is going to make that much differnce. what I am looking to find out was what is hummer's reasoning for the lower rating? I know in stock engine form I could not be doing what I am doing now without that constant down and up shifting hapening.So is that stock engines lack of power the reason, or does it have to do with other factors that I should correct to make it safer?
Thanks
here is a picture of the current setup, looking to increase boat size from 28' to 35' <HR></BLOCKQUOTE>

Nice flames, and send me a pizza!
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  #9  
Old 01-13-2005, 04:37 PM
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That intercooler is mounted way too low
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  #10  
Old 01-19-2005, 11:50 AM
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Another factor in "rated" towing ability is the tires load rating, the softer side walls on tires that are good for off roading, don't have the load capacity of tires that are desigined for pure highway use. The engineers that set the rated limits take into account the tires that are offered from the factory.
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  #11  
Old 12-13-2004, 12:40 AM
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I towed a 10,000 lbs. 24' Box trailer 2,800 miles and even drove with winds over 60 miles an hour (Hurricane Frances) with no problems. I also had electric trailer brakes, Reese equalization bar setup as well as a dual bar sway system. I also tow a 7,000 lbs.+ boat/trailer.
However, if I was towing on a regular basis I would not use the H2.
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  #12  
Old 12-13-2004, 12:01 AM
unaslob unaslob is offline
 
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i will assume that you are in love with your hummer and are unwilling to switch to a different truck... so I would buy another h2 and a good set of chains...

unaslob

sorry couldnt resist...

there are tons of ppl here with superchargers that probably have experimented with bigger then recommended tows. brakes shouldnt be an issue, i would sure hope you are using the trailer brakes. if slowing down is a problem, then that is a trailer issue. i would use the trailer brakes for the majority of the braking resonsibility.. they are cheaper to replace.

i cant imagine towing around 7000 with the h2... i have only towed about 3500 and it is not pretty. if I had to do alot of towing or tow more i would be looking at a supercharger.

unaslob
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  #13  
Old 01-19-2005, 11:52 AM
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The GVWR is just the H2, (or trailer) loaded to the MAX, (fuel, accessories, people, and gear). 3500 pounds on each axle=Gross Axle Weight rating (gawr) for the trailer. If you check the manual you will also find the GCWR or, Gross Combined Weight Rating, which is, GVWR+TOWED LOAD, (approxamatly 7000Pounds)=14,000 pounds.
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  #14  
Old 01-12-2005, 02:49 PM
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<BLOCKQUOTE class="ip-ubbcode-quote"><font size="-1">quote:</font><HR>Originally posted by Don:
I am not having any problem towing at this point, I can pull up a step incline, and maintain 60mph with no problem, and I don't think a couple thousnd more pounds is going to make that much differnce. what I am looking to find out was what is hummer's reasoning for the lower rating? I know in stock engine form I could not be doing what I am doing now without that constant down and up shifting hapening.So is that stock engines lack of power the reason, or does it have to do with other factors that I should correct to make it safer?
Thanks
here is a picture of the current setup, looking to increase boat size from 28' to 35' <HR></BLOCKQUOTE>

WOW11

I pull my little trailers around with mine, 3500 to 5000 lbs. But if I pulled that I'd drive my hubbys diesel. Could you tell me about your supercharger? Is it working well? I pull my little trailer long distances, 1500 miles every 3 months, and I would consider a supercharger since using the big bad Ford isn't as cool as it used to be. I hate making the trip in 2nd and 3rd gear. What about using a programmer? I hate all the shifting too. I could use a few more cahones on the passes.
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  #15  
Old 01-13-2005, 03:47 AM
JMV1210 JMV1210 is offline
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Yes I agree with Ric, thats a nice paint job, very impressed....
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  #16  
Old 01-12-2005, 04:41 PM
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There's a couple of things. 1). The weight of the H2, effecting the gross combined weight rating. 2). The short wheel base. 3). Expecting the Small blocked light duty drivetrain to do the work of a work truck. I've written a couple times here, be prepared, if you have an accident, causing injury or damage, if your Towing OVER WEIGHT! If your found to be over the limits, Insurance won't pay, you will be held liable for All damages and losses. Then it's the cops turn!
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  #17  
Old 12-13-2004, 01:10 AM
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sweet rides... sweet paint job

your question has gotten more intersting.. looking at GM's website. the sierra 2500 HD can tow about 10000 lbs give or take, with a curb weight of 5100 lbs that means the engine can pull 15000 lbs. not bad

the yukon with same engine can tow about 9500 lbs with a curb weight of about 6000 lbs so the engine can pull about 15500 lbs. again not bad

then the h2... can tow 7000 lbs... but only weighs 6800 lbs...so the engine can pull in theory only 13800 lbs... what the hell???

it is not a gearing issue at least in comparison to the yukon both 4.10

ideas????

1) maybe GM feels that the overall aerodynamic 'footprint' creates around a 1000 pounds of drag at a decent speed... certainly not impossible

2) the yukon and sierra come with additional towing packages that have addtional transmission cooling and engine cooling stuff, could that make a difference

3) are the transmissions themselves different?


i personally think areodynamics play some role but certainly not the whole story.

ideas anyone..

unaslob
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Old 01-19-2005, 03:50 PM
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Ok so can someone tell me, the h2 pulling the trailer in the picture without a load is possible?

So the 7,000 are how much the trailer can weigh over the axles including a load? If that is the case, then the only way I can get a weight, to ensure the total weight does not exceed 14,000 lbs is by bringing this to a weigh station.
Joe
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Old 01-13-2005, 02:39 PM
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No towing problems here. I regulary tow a 27' tailgator loaded with 2 full size quads and plenty of gear. All combined about 8k lbs. 60-75 mph and exstremely stable. In fact much more stable than my friends F250 towing about the same rig with alot more towing capacity. I personally feel although only rated at 7000 lbs the H2 tows very well.
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  #20  
Old 01-13-2005, 03:17 PM
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75% gain in horsepower might help towing.

http://procharger.com/gallery/showte...ket=4&idx=1144
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