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Air tank sizing (small/multiple), shortest bags, bag sizing, and air line

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  • Air tank sizing (small/multiple), shortest bags, bag sizing, and air line

    I'll try to cover all my questions in one thread...

    First should be the easiest one. For the rear bags where there's no option but to run the line off the bottom of the bag, should a rubber leader line be used or is a regular nylon line ok? The concern here is what the constant flex does to the line... any concern with a normal line? The lines also need to run under the car. Any good options for protecting the lines?

    Now for air tanks. The whole setup is going to be hidden under the hood (no other option), and I can fit two 1 gallon tanks in the front corners of the engine bay by removing the windshield washer fluid tank and the stock air intake box. Is 2 gallons at 150psi enough to raise an average setup to drive height? Any other issues or concerns with this?

    The first bag question is simple: what's the shortest compressed height bag available? UVair Airhouse are 2", but I swear I remember seeing one that was 1.8". I've hit all the major brands and came up with nothing shorter than 2".

    And on that, I'll probably end up with Airhouse bags. First of all, how does the comfort/quality compare to a double convoluted bag? I will be running an Air Lift bellows front strut. Now it seems most people choose the Airhouse 2, but I think the Airhouse 1 is better for my application. The spring length at my desired ride height is about 4.5-5", which puts it right in the middle of the stroke of the Airhouse 1. Most information says ride height should be in the middle of the stroke of the bag.

    Correct me if I'm wrong, but it takes the same pressure to reach the same ride height in each bag, but it takes a smaller volume with the smaller bag. Obviously a smaller volume of air to fill is desired with my setup. The spring rate of the smaller bag will get progressively stiffer more quickly than a larger bag because there is less empty space in the bag, correct? The one thing that getting me is whether the static spring rate is the same for each bag given the same ride height. My initial reaction is the smaller bag has a higher static spring rate, but thinking about it more, I don't see why it would if it takes the same amount of pressure to reach that height. Can a guru chime in on this? What it comes down to is that it's a sports car, and a softer ride is not an option. And yes, the shocks will make a huge difference.


    I think that covers everything. Hope to get some answers and good discussion out of this...

  • #2
    These are all great questions, I'm surprised nobody has any input. I too am wondering about the lines and protecting them, as I'll be running air on my '88 Volvo soon, and the bag has no choice but to rotate with the strut up front.
    - Bagged '98 Chevy S10 - Stock '88 Volvo 240DL - Broken '87 Mitsubishi Starion ESi-R - Also Broken '87 Shelby Lancer #707/800 -

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    • #3
      run the lines with the brake lines under the car. if something gets up there and fucks things up you will have worse to worry about than your air lines

      you can run a leader line if you want. probably the safest bet, and they aren't expensive.

      2 gallons is fine as long as you don't dick around at stoplights and stuff too much.

      there are a few factors with psi/volume/height relation of a bag.

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      • #4
        Originally posted by Daviticus View Post
        These are all great questions, I'm surprised nobody has any input. I too am wondering about the lines and protecting them, as I'll be running air on my '88 Volvo soon, and the bag has no choice but to rotate with the strut up front.
        I suppose no one's chiming in for the same reason I posted these questions... I searched all over and couldn't find the answers.

        One of my first ideas was the spring wrap for brake lines.


        It's a bit expensive, and I don't like the idea of the metal directly on the plastic line.

        I just bought a spool of vinyl coated fiberglass sleeve. It's heat and abrasion resistant, which will be good for under-hood.


        It's a 100 foot roll, which is way more than I need. Would you be interested in buying part of it?


        Originally posted by Francois Dillinger View Post
        run the lines with the brake lines under the car. if something gets up there and fucks things up you will have worse to worry about than your air lines

        you can run a leader line if you want. probably the safest bet, and they aren't expensive.

        2 gallons is fine as long as you don't dick around at stoplights and stuff too much.

        there are a few factors with psi/volume/height relation of a bag.
        You're probably right about running it with the brake lines, but a little more protection would be nice, since it's not a metal line (which is something I did consider doing).

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        • #5
          everyone runs them with the brake lines. they will be fine. if it really worries you, then run aluminum line instead, but it's really unnecessary.

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          • #6
            is anybody running lines inside? never really looked into it or searched to see if anyone is doing it.

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            • #7
              Originally posted by 07NJx355 View Post
              is anybody running lines inside? never really looked into it or searched to see if anyone is doing it.
              A lot of people run lines inside the car. I would if there was better access inside.

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