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LX and LXI (Unique Issues) If you have a unique issue with your LX or LXI model coach and it can't be answered in one of the other forums here, then this is where you can list it, WITH THE EXCEPTION OF THOSE ISSUES INVOLVED WITH ANY LAWSUIT.....list your LX and LXI Parts here too.

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  #1  
Old 04-14-2010
Doubledoc Doubledoc is offline
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Default Tag axle Air pressure adjustments?

I assume that if the tag axle air pressure goes down the load on the front axle will also go down and those dropped loads will be transfered to the duals. If this is correct, how much drop in air pressure at the tag will drop the tag 800 #s and how much drop in weight will occur at the steering axle. Are there any rules of thumb?

I weighed my 2006 450LXI yesterday. It was 90% fuel,100% water ,25% grey and black tanks and most other loading and two people on board. Only items missing were food and clothes and the cat. I am assuming that the grey,Black tanks offset the missing items.

Here are the results.

Axle Total Left Right Name plate
Front 16150 8100 8000 17000
Dual 20,850 10450 10350 24,000
Tag 12,500 6150 6200 13000
Totals 49,500 24,700 24,550 54,000

To even out the loads I would like to drop the tag 800#s, assume that drops the front about 300#s? and adds the weight to the duals. Is this about right and how much should the tag air pressure be dropped? I assume the loading is not linear with air pressure.
Thoughts?
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'06 450LXI
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Old 04-14-2010
pgchd
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Quote:
Originally Posted by Doubledoc View Post
I assume the loading is not linear with air pressure.
Thoughts?
Yeah, pretty much true from my experience, I weigh every time I leave for my annual "walkabout". Given the data you provided , if it were me, here is what I would do in priority order:
- run 25% fresh water, fill up close to where you will dry camp if that is what you are doing so carry less weight most of the trip, max weight shortest time
- try to run no more than 70% fuel max at all times
- empty the gray and black tanks
- utilize a "trick" I used to do when traveling on a motorcycle for 3-4 months at a time and do every year in the bus:
- look at all you"stuff" and cut it in half, what do I must have verses what can I buy on the road, etc..... include significant other in the spirited debate, yes spirited is defined by using libation first! both parties!!!
- you'd be amazed what you pick up year to year and don't use!!!!
- move some of what you MUST take to the toad.

- reweigh and if you still don't like the weight then you can try the tag axle trick........you'll probably get some benefit but it is hard to quantify as each one of these things is different....good luck!!!!!
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Old 04-14-2010
Doubledoc Doubledoc is offline
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Thanks for ideas. I actually don't carry full water or fuel most times as a practical matter. I am trying to get the load distributed so that I can load up the duals a little more because most extra load will go on the front axle and the duals because that is where the bays are. It would be hard for me to add load directly over the duals as it stands. Also the rating for the hitch is for 10,000 #s max (before recall it was 18,000# max) that would be 1000#s on the tongue which might load up the tag to Max or even more. This is why I want to reduce the tag load a little.

I don't have plans to pull 10,000# at this time but I would like to use the underloaded weight on the duals so that I can actually load the BB up to max < 54,000#s using the bay area and extra passengers at some future time if needed.
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Old 04-14-2010
davidmbrady
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Weight change on the steer axle with respect to weight change on the tag is simply the ratio:

(tag to drive distance) / (steer to drive distance)

Assuming a 296" wheelbase, and a distance of 48" from drive to tag, the ratios becomes: 48/296 = .162

This means that removing 800# from the Tag will remove 800*0.162 = 129.6# from steer.

This will also add 929.6# to your drive. The formula for the weight change on your drive axle with respect to weight change on the tag is the ratio:

(tag to steer distance) / ( drive to steer distance) = (296 + 48)/296 = 1.162

800*1.162 = 929.6#

I think the relationship between air spring pressure and load is linear at a particular ride height. For instance if your tag is at 65psi with a load of 12500#, to get a load of 11700#, I'd try 65 * (11700/12500) = 60psi.

Of course, all this goes out the window if your Hadley system distributes weight dynamically (as the vehicle is driven); i.e., the above is for parking lot static conditions.

Last edited by davidmbrady; 04-14-2010 at 04:39 PM. Reason: Fixed a typo.
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Old 04-14-2010
Doubledoc Doubledoc is offline
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Thank you. Very helpful.
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Old 04-15-2010
rrueckwald rrueckwald is offline
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The Ohio Turnpike prohibits more than 21,000 pounds on any one axle. They say in their regulations they will turn you away if their automatic equipment detects it., Don't know about any other states. You might want to reconsider moving more to the drive axle.
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Old 04-15-2010
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Randy Dupree Randy Dupree is offline
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Doubledoc,your coach has a nice balance as it sits,side to side etc.
Adjusting the weights front to back should not hurt anything.
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Old 04-15-2010
Doubledoc Doubledoc is offline
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I don't know the rules for the Ohio turnpike. However it is my understanding that the Interstate HWY system has a limit of 20,000# per single axle with only two tires. The limit is much higher for the duals.

I think I have it finally figuerd out what to do on the loading of the tag.I plan to reduce the tag air pressure 10%. That will reduce the tag 1250# and add about1480# to the duals while reducing the steer axle 230#. That makes a very nice balancefor all axles and allows us to add an additional 2000# of passengers and bay stuff and not exceed any of the weight limits.

When I get it done I will reweigh and see how close it comes to the calculations.
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Old 04-18-2010
dentmac dentmac is offline
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Default Axle weight limit clarification

axle weight restriction
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Old 04-18-2010
dentmac dentmac is offline
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Above link seems to give "bad gateway" sometimes

go to:
http://ops.fhwa.dot.gov/freight/sw/index.htm

then "questions and answers about ....

20,000 per axle-( single or dual) 34,000 tandem
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