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Re: [GMCnet] Replacing air bag system [message #248087 is a reply to message #248084] Mon, 21 April 2014 16:20 Go to previous messageGo to previous message
emerystora is currently offline  emerystora   United States
Messages: 4442
Registered: January 2004
Karma:
Senior Member
Please quit trying to put words in my mouth and just read my message for exactly what I say. NO, that does NOT mean that all OEM coaches should have been at ride height. I had said in my last message that properly adjusted coaches are well controlled if the air system is leak free and properly maintained. Obviously, many if not most GMCs are not properly adjusted. The torsion bars weaken over years of use and must be checked and adjusted periodically. The air bag level sensors also can change over time. The air bags weaken over time and the pressure that once worked must be changed to maintain the proper ride height.

Even your air bag control is only adjusted properly for a time. It would also have to be periodically adjusted due to aging air bags, torsion bars etc., differences in loading, etc. Do you tell people that they can set it once and forget it ?

Emery Stora

> On Apr 21, 2014, at 2:31 PM, James Hupy <jamesh1296@gmail.com> wrote:
>
> Emery, a couple of years ago, as a technical program at GMCWS, Gary Bovee,
> Jerry Work, Gary Berry, Frank Condos, myself and others measured ride
> height and weighed arriving coaches at the Casa De Fruita rally. After a
> day and a half, we discontinued weights and measures. The data that we
> gained told us that NONE of the arriving coaches was correct in either ride
> height or weight balancing. If what you say is correct, all the OEM
> equipped coaches should have at least been at ride height or close. Most of
> them were inches low in the front as well as uneven in front. Nearly every
> coach was too high in the rear. The data we gathered tells me that there
> are very few coaches out there that have correctly adjusted and/or properly
> operating systems. That being said, I think it matters very little whether
> a system is controlled by pneumatic/hydraulic valves, electronic ride
> sensors or transponder air pressure controls. Nearly all of them have
> flaws. I guess you pick the ones you are most comfortable with and go with
> that.
> Jim Hupy
> Salem, Or
> 78 GMC ROYALE 403 with wireless air.
>> On Apr 21, 2014 12:57 PM, "Emery Stora" <emerystora@mac.com> wrote:
>>
>> I don't agree that it negates the idea that the system maintains and
>> adjusts the ride height when traveling.
>> If you are driving on a crowned road for more than the 20 second delay
>> time it will adjust the bag pressure to keep you more level. Also, when
>> the amount of water in your water tank or holding tanks changes it will
>> make adjustments for that and the same goes for fuel tank levels and
>> passenger or cargo loads.
>>
>> The wireless system would appear to be better than manually filling the
>> bags and shutting off the valves at the bags but it doesn't replace a
>> properly working air bag system which is controlled by the Travel position
>> of the control switches.
>>
>> Emery Stora
>>
>>> On Apr 21, 2014, at 1:43 PM, James Hupy <jamesh1296@gmail.com> wrote:
>>>
>>> Kerry, All systems are controlled by air pressure in the bags. If the
>> bags
>>> are OEM, QUADRA-BAG, SULLIBUILT, or any other incarnation. All the ride
>>> height sensors do is control the air pressure. All of the GM installed
>>> systems have a built in time delay of around 20 seconds or thereabouts to
>>> keep crown roads, bridge approaches, etc. from making the systems work
>>> while going down the road. So, this negates the idea that the system
>>> maintains exact ride height going down the road. OEM systems sense when
>>> enough air has leaked from the system, start the compressors and adjusts
>>> the air pressure in the bags until the ride height sensor reaches it's
>> pre
>>> set null point, and stops adding air to the bag.
>>> Funny thing, the wireless system constantly monitors air pressure that
>> was
>>> pre selected as the amount of pressure necessary to achieve correct ride
>>> height. A transponder and wireless modem in the manifold communicate with
>>> the pre set pressure in the remote control, and maintains air pressure in
>>> the bags, plus or minus 3 psi. The system requires no air lines other
>> than
>>> the ones from the manifold to the bags, and only three electrical
>>> connections. It has the added features of pre set pressures for dumping
>> the
>>> tanks with one touch of a button, and returning to ride height merely by
>>> pushing another button. The remote control can also be used to campsite
>>> level the coach, with the same return to ride height, one touch of a
>>> button. Choice is yours, I guess.
>>> JIM HUPY
>>> Salem, Or
>>> GMC ROYALE 403
>>>> On Apr 21, 2014 12:17 PM, "Kerry Pinkerton" <Pinkertonk@mchsi.com>
>>> wrote:
>>>
>>>>
>>>>
>>>> Perhaps I'm missing something but how does the wireless system know what
>>>> the correct height is? Bag pressure is not the same thing as ride
>> height.
>>>> --
>>>> Kerry Pinkerton
>>>>
>>>> North Alabama, near Huntsville,
>>>>
>>>> 77 Eleganza II, "The Lady", 403CI, also a 76 Eleganza being re-bodied as
>>>> an Art Deco car hauler
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