| [GMCnet] Is there a DIRECT relationship between PSI in the air bag and ride height? [message #191872] |
Sat, 01 December 2012 10:01  |
glwgmc
Messages: 1014
Registered: June 2004
Karma:
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Senior Member |
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In most cases, yes, the ride height can be set by pressure in the air bags. If you radically alter weight distribution you will need to readjust. All of the folks who use Schrader valves instead of the stock compressor set up do it all the time. Set the air pressure where you think it should be, drive the coach a few miles and measure from a flat surface to the top of the rear slot and change pressure until you get the correct factory spec ride height. Drive a few miles and recheck. Once the ride height is correct, then measure and record the pressure in both bags. Also, measure from the ground to the side molding strip on both sides and record that also. Makes it much easier to recheck when you need to. Now that you have the rear ride height correct, check the front as well. Changes in the rear ride height will effect the front far more than you might think. Read much more detail about ride height, alignment, etc. on the GMC page on my web site, http://jerrywork.co
m or from the GMCWS.org web site. Hope this helps.
Jerry
Jerry Work
Fine furniture designed and hand crafted in the 1907 former Masonic Temple building in historic Kerby, OR
glwork@mac.com
http://jerrywork.com
541-592-5360
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Message: 12
Date: Sat, 01 Dec 2012 07:35:12 -0600
From: Kerry Pinkerton <Pinkertonk@MCHSI.com>
Subject: [GMCnet] Is there a DIRECT relationship between PSI in the
air bag and ride height?
To: gmclist@temp.gmcnet.org
Message-ID: <2ed62.50ba078f@gmc.mybirdfeeder.net>
Content-Type: text/plain; charset="ISO-8859-15"
This site is driving me crazy. Way too much information to absorb. I thought I was past all that :lol: :lol: :lol:
All this talk of alignment got me thinking. Now keep in mind I've had my coach (77 Eleganza II stock suspension, Electro Level II)for a couple months and have only driven it a hundred miles or so. However, when I drove it home it wandered all over the ruts. That said, I did not 'set' the ride height and really don't have any idea what settings the ride height buttons were on.
What I THINK I've learned is that the wander COULD well have been caused by having the rear end too high, resulting in decreased caster.
I understand from reading here and in the manual that if everything is working correctly with the Electro Level II system, and if I follow the directions for operations, the coach should move to the set level and stay there (if I set the switches right). Assuming the level thingies are adjusted correctly, this should ensure my coach is at the proper ride height. Right?
Ok, so if that is correct I'll be good to go. However, I got to thinking (always a dangerous thing for me because it makes me want to tinker). Is there a direct relationship between air bag PSI and right height. That is, if we put a TEE in the air lines going to the bags and ran them up to a couple gauges in the cockpit, would the PSI readings be a fairly accurate measurement of ride height? That is, assuming some minor variation for temperature and cold bags, is X PSI always going be the same for a given ride height?
Or am I just over thinking things as usual? :lol:
--
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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Jerry & Sharon Work
78 Royale
Kerby, OR
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