
Originally Posted by
Slunnie
Airbags are really interesting in terms of setup. The spring rate in the airbags is always progressive and the progressive nature is determined by the volume in the airbag. This is affected by a few things like diameter and length, but also the shape of the plunger bit inside of it. I think different manufacturers produce different plunger bit shapes to try and set the rates as required when at various heights. The other thing that seems to happen with them is that the spring rate increases with load which is great for touring, but also spring rate and the progressive action increases as the ride height is adjusted upwards. ie if you take a standard ride height airbag and jack it up 2" then you'll end up with stiffer suspension, but if you space the airbag by 2" or run a 2" lifted airbag then you'll have the same spring rates. All of this said, air isn't common on comp rigs and reading on Outerlimits I think Sam Overton (I hope Im not putting words into his mouth)was saying that this is due to the progressive nature of them, but there are a few full sized rigs that are running them successfully, with the 2 that come to mind being Wooders with his mega lifted Jeep and also the mammoth PGS LandCruiser in Tuff Truck. But! Heres where it gets interesting. Via airshox that are nitrogen springs, they have exactly the same properties and just about all, if not all competitors in WeRock are now using them over the more traditional coilover setups, but the trick with making them work seems to be to have a lower base ride height. The reason why full size truck are not on Airshox though, is because the Airshox cant support that much weight, although the manufacturers are now selling 2.5" over 2" and so they're making way, but still not of the load carrying capacity of an airbag!
Thats enough of my ramblings.
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