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Thread: RRC / P38 EAS AirBag Pressure

  1. #11
    Join Date
    Jan 2016
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    I only have a manometer in the mains line, not per bag so I only know the system pressure but the car usually does not move to the correct height until the pressure in the system is around 3-4 bar so I guess that kind of matches the pressures posted before.

    Also, if you have gen 3 bags:

    The cross section of the air bag is essentially constant at all heights as each bag must support a quarter of the cars weight for a balanced car for example, so the pressure must remain the same for the upward force to be constant and support the car.
    Changing heights consists of either adding air to raise or venting air to lower.
    the diameter of the lower mount is not equal, this gives the air "spring" a non linear response, ie. a harsher ride on highway setting and a looser ride on off road. Still should not change the pressures

    -P

  2. #12
    Join Date
    May 2020
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    Illawarra NSW
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    Quote Originally Posted by prelude View Post
    The diameter of the lower mount is not equal, this gives the air "spring" a non linear response, ie. a harsher ride on highway setting and a looser ride on off road. Still should not change the pressures

    -P
    Good observation P.
    There is also another reason for the harsher ride on the highway setting.
    It results from just having less air in the bag. By having less air, a given movement from a disturbance results in a larger pressure change, ie, a stiffer response exactly the same as having a shorter spring.

    I have seen many discussions on other forums where posters have wanted a softer ride and have been given the advice "reduce pressures in the air bags".
    They would not only be able to do this without dropping the car on to the stops, but even if they adjusted the controls to have the car sit lower, it would actually result in a harsher ride.

    Cheers,
    Keijo

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