Home » Public Forums » GMCnet » [GMCnet] Is there a DIRECT relationship between PSI in the air bag and ride height?
| [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: 10
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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
===================
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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| Re: [GMCnet] Is there a DIRECT relationship between PSI in the air bag and ride height? [message #191873 is a reply to message #191872] |
Sat, 01 December 2012 10:04  |
Mr ERFisher
Messages: 7117
Registered: August 2005
Karma: 2
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Senior Member |
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Welcome home
FREE WIFI @ Mickey D
On Dec 1, 2012, at 8:01 AM, Work Jerry <glwork@mac.com> wrote:
> 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
> ===================
> 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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> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
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| Re: [GMCnet] Is there a DIRECT relationship between PSI in the air bag and ride height? [message #191878 is a reply to message #191873] |
Sat, 01 December 2012 11:04 |
James Hupy
Messages: 6806
Registered: May 2010
Karma: -62
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Senior Member |
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Just a point of clarification on the "notched stick" approach to ride
height. The stick that you create for the drivers side of your coach may
well be incorrect for the passenger side, and positively, absolutely, has
a snowball's chance in hell of being correct on someone else's coach. GO TO
THE OVAL SLOTS IN THE FRAME for any serious ride height adjustment. As an
aside to this comment, Gary Bovee, who developed the wireless remote
control self contained plug and play system, has sold the system to me. In
the next couple of weeks, I will have available the next version of his
design. My costs will be similar to what Gary was offering them for. If
anyone is interested in the system, let me know.
Jim Hupy
Salem, Or
78 Gmc Royale 403
On Dec 1, 2012 8:04 AM, <mr.erfisher@gmail.com> wrote:
> Welcome home
>
> FREE WIFI @ Mickey D
>
>
>
>
>
> On Dec 1, 2012, at 8:01 AM, Work Jerry <glwork@mac.com> wrote:
>
> > 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
> > ===================
> > 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
> > =======================
> >
> >
> >
> > _______________________________________________
> > GMCnet mailing list
> > Unsubscribe or Change List Options:
> > http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
>
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| Re: [GMCnet] Is there a DIRECT relationship between PSI in the air bag and ride height? [message #191880 is a reply to message #191878] |
Sat, 01 December 2012 11:18 |
Ken Burton
Messages: 10030
Registered: January 2004
Location: Hebron, Indiana
Karma: 10
|
Senior Member |
|
|
| James Hupy wrote on Sat, 01 December 2012 11:04 |
Just a point of clarification on the "notched stick" approach to ride
height. The stick that you create for the drivers side of your coach may
well be incorrect for the passenger side, and positively, absolutely, has
a snowball's chance in hell of being correct on someone else's coach. GO TO
THE OVAL SLOTS IN THE FRAME for any serious ride height adjustment. As an
aside to this comment, Gary Bovee, who developed the wireless remote
control self contained plug and play system, has sold the system to me. In
the next couple of weeks, I will have available the next version of his
design. My costs will be similar to what Gary was offering them for. If
anyone is interested in the system, let me know.
Jim Hupy
Salem, Or
78 Gmc Royale 403
|
On the adjusting to the ovals, I cut two 2x4's and two 2x2's that fit under the frame at the point where the ovals are. It is much easier checking for correct height that way. The 2x2's go in front and the 2x4s go in the rear. I also have lines marked on the blocks to easily measure how low a given location on the coach is. This is not my original idea. I got it from Jim K.
Ken Burton - N9KB
76 Palm Beach
Hebron, Indiana
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