| Re: [GMCnet] Air suspension and leveling system [message #319334 is a reply to message #319330] |
Tue, 20 June 2017 10:46   |
Keith V
Messages: 2337
Registered: March 2008
Location: Mounds View,MN
Karma:
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Senior Member |
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Jim,
Radar is a little extreme for my world I think!
Rick,
I'm pretty sure the OEM system adjusts on a cloverleaf, I remember seeing it.
The question is should it?
The OEM system had 1 delay time, I have more control, so I contest that on short turns no leveling should be done as that would change the handling of the coach and runs the compressor more than necessary
Long sweeping turns yes, that should be fine and is pretty much unavoidable.
Keith, who has height data and knows how it rolls, vasilakes
________________________________
From: Gmclist on behalf of Richard Denney
Sent: Tuesday, June 20, 2017 10:09:08 AM
To: gmclist@list.gmcnet.org
Subject: Re: [GMCnet] Air suspension and leveling system
Keith, I don't agree that leveling on curves is a bad idea. My coach will
fill the outside bag on long, sweep turns, which provides a bit of roll
stiffness just the same as a roll bar. It levels back out pretty quickly
after the turn. It would take a pretty long cloverleaf ramp ("loop ramp" in
the biz) to get past the damping of the leveling valves, but when driving
in our Eastern mountains, we have a lot of sweeping turns that extent for a
mile or more. We have to realize that most curves are superelevated
(banked) and that doesn't look much different than a crown except for the
lateral forces on the coach. I cannot imagine why the leveling system
controlling roll would be something to overcome rather than enjoy.
Leveling valves won't level a coach on a crowned road, except to correct
any tendency for the coach body to roll to the downhill side, which will be
pretty minor.
Crosswinds are usually gusty and the damping of the leveling valves filters
them out.
Rick "who has a dash air pressure gauge and knows when the leveling valves
open up" Denney
On Tue, Jun 20, 2017 at 9:59 AM, Keith V wrote:
>
> Thats interesting Rob
>
> The problem is what is the 'right' time delay?
>
> Do you want the coach to adjust while taking a turn, like a cloverleaf or
> roundabout?
>
> I say no, thats a bad idea
>
>
> What about cross winds?
>
> Yes
>
>
> crowned roads?
>
> Definitly
>
>
> Ideally the system would sense steering angle and then it would be able to
> do the right thing.
>
> Maybe using an accelerometer could determine if the coach is turning...
>
>
>
--
'73 X-Glacier 230 "Jaws"
Northern Virginia
Offlist email: rick at rickdenney dot com
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Keith Vasilakes
Mounds View. MN
75 ex Royale GMC
ask me about MicroLevel
Cell, 763-732-3419
My427v8@hotmail.com
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