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post #31 of 39 (permalink) Old 05-01-2017, 11:53 AM
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Originally Posted by SS_Syndicate View Post
This confuses me a bit... My desire is to keep ride when unloaded the same by letting the air out (or near zero psi). Then when towing air up to maintain the rear ride height. The only real way to set this up right is to air them up (under load) until you achieve the original ride height (I think).



Maybe these aren't for us....


You can't have them without pressure. They have to have at least 10psi in them at all times. This is in the manual, it prevents excessive wear and tear by not letting them get pinched. These aren't load leveling airbags like on trucks. But I've found at 40psi which is 10psi over the max recommended limit on the bags even though I found a conflicting manual that said you could go to 50psi if there was less than 1" of space between the coils.

Since these airbags go inside the springs but don't go to the very bottom and very top of the spring they don't raise or lift the spring unless it's compressed to the point of the airbag. So you may get about an inch of sag even with the airbag. These airbags don't expand up and down, they expand out to the side putting pressure against the inside of the spring making it stiffer and more difficult to compress.

I have an air gauge/ compressor kit so I can air up or down the airbags on the fly and make sure the bags always have 10psi in them. I've found that if I fill them at 40psi, then hook up my trailer that has got to be at 400-500lbs of tongue weight the pressure will read 45psi and it rides very level.

I also haul a power chair lift and power chair from time to time. The combined weight of that is over 550lbs of dead hanging weight, I again run 40psi and the jeep sits fairly level.

First picture, with airbags. Second picture, with airbags, third picture without airbags. Fourth picture is of the undercarriage that you can see the airbags. I was on a 30 degree RTI ramp.




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post #32 of 39 (permalink) Old 05-01-2017, 11:55 AM
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Here's a better towing photo.




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post #33 of 39 (permalink) Old 05-01-2017, 12:26 PM
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Yea, I'm glad I posted....

These are not for me. I kinda knew they would need a little pressure to avoid pinching but wanted it to be near zero. If I wanted more spring rate all the time I would just get higher rate springs and not worry about the air. I know this isn't adjustable, but it doesn't really sound like these are either (at least not the way I want them to be). I haven't fully tested, but only have about 3/4" of rear sag anyway.

I haven't researched, but are there any longer bags of the same diameter that would offer support at an empty ride height?

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post #34 of 39 (permalink) Old 05-01-2017, 12:34 PM
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Yea, I'm glad I posted....

These are not for me. I kinda knew they would need a little pressure to avoid pinching but wanted it to be near zero. If I wanted more spring rate all the time I would just get higher rate springs and not worry about the air. I know this isn't adjustable, but it doesn't really sound like these are either (at least not the way I want them to be). I haven't fully tested, but only have about 3/4" of rear sag anyway.

I haven't researched, but are there any longer bags of the same diameter that would offer support at an empty ride height?


The kit I'm using was actually made for another vehicle but this is the kit I was told should work with the jeep since we have a 4" inner diameter spring and 9" tall. I guess you could go with a taller bag, they have them but I'm not sure what the effect will be to be honest.

The bags owners manual says 5psi at all times. The air compressor kit that includes reference to the airlift bags says 10psi. It's weird.

The range with just the bags is 5-30psi. The range with the air compressor kit is 10-50psi. I guess you could remove the spring and do custom made load leveling airbags but you'll lose flex and may cause problems.

You could also try airshocks if you can find ones that'll fit.


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post #35 of 39 (permalink) Old 05-01-2017, 12:42 PM
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Hmm... I will look into this more and update. At 5-PSI I am looking at about 125 points of force or spring rate increase. This isn't too much and I may be able to lower the tire pressure (unloaded) to get the ride back.

I will definitely be looking for a bag that reaches the ends unloaded. This should help eliminate the wear issue while running lower pressure.

I'm not looking for much support. This is more of an issue of clearance for me. I just don't want to lose any given some of the places we have planned while towing the trailer.

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post #36 of 39 (permalink) Old 05-01-2017, 12:46 PM
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@Len1304

Hmm... I will look into this more and update. At 5-PSI I am looking at about 125 points of force or spring rate increase. This isn't too much and I may be able to lower the tire pressure (unloaded) to get the ride back.

I will definitely be looking for a bag that reaches the ends unloaded. This should help eliminate the wear issue while running lower pressure.

I'm not looking for much support. This is more of an issue of clearance for me. I just don't want to lose any given some of the places we have planned while towing the trailer.


Here's the downside if you decide to go with an air compressor kit. Unless you get a dual gauge or dual kit both the left and right kit will be combined with a t valve. This means, while one tire flexes and the other drops the compressing tire will push the air from one bag, into the bag with less pressure due to it hanging. I tested this on the RTI ramp. I went backwards up it at 10psi then again at 50psi and the wheel gap was the same both times.

To avoid this, either fill each bag separately or get a dual compressor kit. I tow more than I offroad so it's not a real concern to me. But if you are overlanding it's something to consider.


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post #37 of 39 (permalink) Old 05-01-2017, 01:00 PM
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Here's the downside if you decide to go with an air compressor kit. Unless you get a dual gauge or dual kit both the left and right kit will be combined with a t valve. This means, while one tire flexes and the other drops the compressing tire will push the air from one bag, into the bag with less pressure due to it hanging. I tested this on the RTI ramp. I went backwards up it at 10psi then again at 50psi and the wheel gap was the same both times.

To avoid this, either fill each bag separately or get a dual compressor kit. I tow more than I offroad so it's not a real concern to me. But if you are overlanding it's something to consider.
I'm not sure this is an issue... It's basically how ORIs work. If one tire needs to go up, the other should be going down. If anything it should add stability on off-cambers. I plan to fill off my Power-Tank though. The KL does not have nor do I plan to install a compressor.

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post #38 of 39 (permalink) Old 05-01-2017, 01:04 PM
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This was the air compressor kit I bought. Very simple to install, mounts behind the plastic in the spare tire area. You never even see it.

Air Lift 25850 Load Controller Single Standard Duty Compressor https://www.amazon.com/dp/B004OSY3L6..._RO2bzb9HGATVJ


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post #39 of 39 (permalink) Old 05-01-2017, 06:04 PM
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I too have the bags. have an old thread out there when I installed them. Mine i have separate lines no built in compressor
Just added coil air spring helpers to my Trailhawk
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