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Re: [GMCnet] Replacing air bag system [message #248130 is a reply to message #248129] Mon, 21 April 2014 23:08 Go to previous messageGo to previous message
Bob de Kruyff   United States
Messages: 4260
Registered: January 2004
Location: Chandler, AZ
Karma:
Senior Member
Keith V wrote on Mon, 21 April 2014 21:59

Bob de Kruyff wrote on Mon, 21 April 2014 17:04



One system (remote) is open loop in that there is no feedback to re-adjust to where you thought it was, while the OEM system is a closed loop. However, neither is that precise that it probably isn't worth arguing about. I think the remote system is a good alternative for a lot of people, but since I have a working system, I'll try to keep it that way.


Dang, did I say I wouldn't post again?

Actually the pressure only system does the wrong thing when the load changes.
This means the more things change the worse they get.
For example...

In the pressure controlled system:
Set the pressure, say 80 lbs
Then load the coach with fuel and water, groceries, luggage and 6 people.
The extra weight makes the rear end sag.
It also increases the pressure in the bags due to the greater weight.
This tells the pressure controller to dump air, causing the rear to sag even more.

In a height controlled system the saggy rear would tell the controller to increase air pressure which would bring the height back at least closer to tolerance.

I know it works, if I stand on MY rear bumper I see it readjust.
It goes back up. Yes you have to stand there for more than 20 seconds.

Is it a perfect system? well it was designed in the 70s but it does better than no controller.




I agree Keith. My system adjusts if I walk from the front to the rear so it is quite sensitive. When I go camping lot's of supplies and gear comes and goes during the week--and the thinking that weight is insignificant is not true--at least in my case. However, I liken this argument to whether you want to set the temperature in your house or car or just open and close the window once in a while. I've always felt that you control the issue that is important to you directly--not through some other influencing factor. I suppose some of us like a thermostat in our vehicles, while others would be happy with a manual valve that gets it close part of the year.

Bob de Kruyff
78 Eleganza
Chandler, AZ

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