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Thread: Its official, im confused... (bag over coilovers)

  1. #51
    Join Date
    Jul 2009
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    san diego
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    1,098

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    very helpful thread. thanks to everyone who commited haha

    i finally clearly understand what i wanna do with m car this summer!

  2. #52
    Join Date
    Sep 2010
    Location
    Paris, France
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    I'm beginning to think about how I will proceed to put my BMW E21 on air.

    I'm considering Universal Aero Sport bags over my coilovers in the front but in the rear I have no idea what are the possible ways of doing it

    Can someone help me to choose the right setup for the rear. What are U Mc Pherson guys putting as bags in the rear 'cause UAS bags are a bit wide in diameter and I'm scared about clearance issues between my rims and the bags?

    Enter the E21st century

  3. #53

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    Quote Originally Posted by FreshLikeSushi View Post
    just from my experience

    Y33 on UAS bags, with S13 front suspension swap, and CST coils.
    I ran about 80 PSI daily
    Needed it stiffer since i drove low low

    Pics of my setup:


    not inflated

    you can see the notch i made to fit the fitting

    Now the way i set up the car, was to put it on the ground and on teh kit when it was fully deflated.
    I did some prelimiary measurements using the bag compressed size and stroke of hte shock blah blah and adjsuted it. After some fine tuning of the setup i ended up with this:

    you can see the travel path here


    finished product at ride height:

    and at full down


    in a perfect world id haev the bag tested at XX psi to get an equivalent Spring rate (obviously not the exact same due to the different compression/rebound characteristics of a spring vs bag) and then get shocks valved to said springrate equivalency.

    but, i never keep a car long enough so whatever
    how does the bag stay sealed?

  4. #54

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    The bag is already sealed, its like they took and air spring cut a large hole in the center and then resealed the inside.
    this is what the inside looks like

  5. #55

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    its not fool proof, if you have a car where the strut turns with the steering wheels, the bag tends to rotate, then doesn't rotate back, then you run into all sorts of issues, i've ripped the airline out of my bag overs, i've rubbed a hole through the leader line.

    you gotta worry about wheel clearance, cuz that's a big deal, you can't just spin that shit down and expect it to clear a wide wheel. All in all, i would NEVER run bag over coils ever again after my initial experience.

  6. #56
    Join Date
    Oct 2009
    Location
    Dallas, TX
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    4,294,967,248

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    Quote Originally Posted by d.tek View Post
    its not fool proof, if you have a car where the strut turns with the steering wheels, the bag tends to rotate, then doesn't rotate back, then you run into all sorts of issues, i've ripped the airline out of my bag overs, i've rubbed a hole through the leader line.

    you gotta worry about wheel clearance, cuz that's a big deal, you can't just spin that shit down and expect it to clear a wide wheel. All in all, i would NEVER run bag over coils ever again after my initial experience.
    Depends on the suspension set up. Double wishbone doesn't have that problem with the wheel/tire clearance. However, then, the knuckle arm and bag clearance comes into play.
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    if "life, liberty and the pursuit of happiness" doesnt include being able to buy a huge veiny motherfucker then the declaration of independence isnt worth the hemp it was written on.
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    he speaks the truth.. he doesn't even have the -- -- eyes.

  7. #57
    firelizard Guest

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    Quote Originally Posted by d.tek View Post
    its not fool proof, if you have a car where the strut turns with the steering wheels, the bag tends to rotate, then doesn't rotate back, then you run into all sorts of issues, i've ripped the airline out of my bag overs, i've rubbed a hole through the leader line.
    Bearings?

    you gotta worry about wheel clearance, cuz that's a big deal, you can't just spin that shit down and expect it to clear a wide wheel. All in all, i would NEVER run bag over coils ever again after my initial experience.
    Measuring tape?

  8. #58
    Join Date
    Oct 2009
    Location
    PacificNorthWest
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    1,617

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    Quote Originally Posted by d.tek View Post
    its not fool proof, if you have a car where the strut turns with the steering wheels, the bag tends to rotate, then doesn't rotate back, then you run into all sorts of issues, i've ripped the airline out of my bag overs, i've rubbed a hole through the leader line.

    you gotta worry about wheel clearance, cuz that's a big deal, you can't just spin that shit down and expect it to clear a wide wheel. All in all, i would NEVER run bag over coils ever again after my initial experience.


    I agree that it is not fool proof, thats why air isnt for everyone but I have to disagree, when installed properly you will not have a single issue. I have ran bag overs for about 20k miles... none of this has happened to me and my struts turn with my steering.

  9. #59
    Join Date
    Jul 2009
    Location
    SoCal- S|W
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    1,505

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    Quote Originally Posted by firelizard View Post
    Bearings?
    Agreed. I used a set of these on the perch to allow the bagover to spin freely.



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