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  #1  
Old January 1st, 2022, 10:41
Woodswanderer Woodswanderer is offline
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Airbags/air springs for rear ride control and load calculations

Looking to install an air lift rear kit from Michigan truck springs. Has anyone done an airbag or air load leveling setup on their XJ? Still mostly stock with new oem replacement parts (upgraded to HD/better parts material where possible)

Im trying to also calculate the total load capacity of the setup. MTS says the kit provides 2000lb of load leveling capacity (assuming 100% efficiency, engineering wise its more like 1500-1600lb after 20% loss margin), what i need to find out is if thats additional per spring or pair, or if its total capacity overall in combination with the rest of the suspension per spring/pair.

Specs of rear suspension design are as follows:

-Upgraded rear leaf springs to Husky HD @ 745lb/spring (equivalent to factory upcountry spring rates?)
-moog thermoplastic sway bushings at links
-energy suspensions sway bar mount bushings
-KYB monomax shocks with bar pin flag nuts

-On hand-
Gabriel skyjackers - 90 psi max, cant say what the load rating is at max psi

I may install 1Ē lift blocks front and rear when i do the Crown HD front springs. Rear KYBs may get pulled too, might be blown (in under 5k miles of highway and town driving).

How can i calculate the overall load capacity of this setup? It cant be as easy as adding up all the numbers and subtracting 20% 🤣


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  #2  
Old January 1st, 2022, 11:05
Woodswanderer Woodswanderer is offline
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Airbags/air springs for rear ride control and load calculations

Task 2 of this job: design and install an electopneumatic circuit with gauge for two different pressures. Cant decide between full independent or single circuit. Its a Jeep, not a low rider. Load leveling, not stance.

Having rear air shocks on hand i could plumb two independent, single path circuits into the shocks and airbag springs. Starting with air shocks, run abs tubing back to a T, into another T valve with the sending unit. Airbags get the same setup with the second sending unit. Two switches in cabin.

From there, connections at the pump are what have me thrown off. I want to use a single pump. How? Solenoids and diverter valves with a reservoir tank? Relayed switches? Or just say eff it and run 1 pump per circuit?


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  #3  
Old January 1st, 2022, 11:12
Woodswanderer Woodswanderer is offline
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Airbags/air springs for rear ride control and load calculations

Part of me also wants to wire in a pressure switch that will activate the pump when load/squat in the rear is detected. Self leveling suspension...

P2 platform Volvo XC70 wagons had a switch on the rear for self leveling that may work if mounted properly and the armature is modified.


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  #4  
Old January 27th, 2022, 19:37
Woodswanderer Woodswanderer is offline
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Airbags/air springs for rear ride control and load calculations

Bumping this up. Picked up a 10gal air tank to use as a reservoir. Has a fitting on top that i can plumb my sensor into. Most likely going to go that route and just rig up the compressor to the airbags in single circuit.

Air shocks will run independent with the valve mounted on the hitch, and OBA connection from the reservoir tank to inflate. Planning to run tools with this setup too (small impact, die grinder, air ratchet) eventually.

Anyone have a good suggestion for an HD compressor that wont break the bank?


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  #5  
Old January 27th, 2022, 21:25
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sdspearo sdspearo is offline
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Re: Airbags/air springs for rear ride control and load calculations

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Originally Posted by Woodswanderer View Post

Anyone have a good suggestion for an HD compressor that wont break the bank?
Not sure what they cost now but I've been happy with my Puma 3/4hp (the one with the blue tank).
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'96 XJ: Locked up D44's on 35" Milestar Patagonia's, ChroMo axles, 6" lift w/ 3 link front, 4 link rear, AX15, Atlas 5.0, Internal cage, DIY beadlocks, hydro assist, big ass stinger!, ...
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  #6  
Old January 27th, 2022, 21:20
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sdspearo sdspearo is offline
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Re: Airbags/air springs for rear ride control and load calculations

Check out Skruffy's build...

https://www.naxja.org/forum/showthread.php?t=1162234&highlight=skruffy+air+sus pension
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'96 XJ: Locked up D44's on 35" Milestar Patagonia's, ChroMo axles, 6" lift w/ 3 link front, 4 link rear, AX15, Atlas 5.0, Internal cage, DIY beadlocks, hydro assist, big ass stinger!, ...
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  #7  
Old January 27th, 2022, 21:26
Woodswanderer Woodswanderer is offline
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Airbags/air springs for rear ride control and load calculations

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Originally Posted by sdspearo View Post

Thanks. Thats more in depth than i plan to get into. Keeping leaf spring setup in the rear, adding Airlift airbag helpers in place of bump stops is the plan.

Compressor-wise, the Viair was recommended by a buddy of mine that was into TJ stuff. Pricey option and iíd like to find cheaper.

The digital gauge i plan to use comes with 2 sensors in the package, pre-wired. 1/4Ē npt iirc


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  #8  
Old January 27th, 2022, 21:29
Woodswanderer Woodswanderer is offline
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Airbags/air springs for rear ride control and load calculations

https://www.ebay.com/itm/2-Inch-52mm...-127632-2357-0

This is the gauge i plan to use (to match trans oil temp gauge).


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  #9  
Old January 28th, 2022, 09:16
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Goose_XJ88 Goose_XJ88 is offline
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Re: Airbags/air springs for rear ride control and load calculations

There is also the old GoJeep writeups

http://gojeep.willyshotrod.com/Howto...Suspension.htm

http://gojeep.willyshotrod.com/Howto...Suspension.htm
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88 XJ Laredo 8" RE SA, drop brackets, 35s D30/44 4.56, AW4, 242, 7100s, Loganís ft winch bumper, JCR swing out tire carrier, JCR sliders, 96 booster, 97+ mirrors & console (FOR SALE)
99 XJ Limited, AW4, 242, Colombia Edition WJ Seats, Stock. Future 4.5" lift, TnT LA, 33s armor, 231 SYE, D30/44 4.56, rear locker, etc
93 XJ 2 Door AX-15 D30/8.25 3.55 swap, (SOLD)
92 MJ AW4 2wd, 97 mirrors. Future 4wd swap, 242, MJ 44, Eliminator Roll bar, Bucket seats, 97+ console
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  #10  
Old January 28th, 2022, 12:28
Woodswanderer Woodswanderer is offline
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Airbags/air springs for rear ride control and load calculations

Quote:
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👆🏻🙏🏻🙏🏻🙏🏻


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  #11  
Old January 29th, 2022, 09:22
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Skruffy Skruffy is offline
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Airbags/air springs for rear ride control and load calculations

Woodswanderer,
I think what you are planning to do will work out well. Much of the advantage of the air springs will be obtained by just using bags and you save the giant hassle and $2700 cost of a coil conversion.
After driving around my XJ with air springs for almost 3 years now I can tell you that air suspensions in general are very forgiving.
When my XJ is at highway height and totally empty it rides great, when I load it up with stuff and it drops 2Ē, I just put it back in highway height and it rides great. I can hitch my 4000lb trailer to it, it sags of course, then I just fill the air springs back to highway height and it rides great.
I think the amount of weight that it would take to max out the Air springs would have long since crushed the chassis.
I say go for man. Air suspension is so much more adaptable for any situation that your XJ can be in.
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  #12  
Old January 29th, 2022, 09:28
Woodswanderer Woodswanderer is offline
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Airbags/air springs for rear ride control and load calculations

Quote:
Originally Posted by Skruffy View Post
Woodswanderer,
I think what you are planning to do will work out well. Much of the advantage of the air springs will be obtained by just using bags and you save the giant hassle and $2700 cost of a coil conversion.
After driving around my XJ with air springs for almost 3 years now I can tell you that air suspensions in general are very forgiving.
When my XJ is at highway height and totally empty it rides great, when I load it up with stuff and it drops 2Ē, I just put it back in highway height and it rides great. I can hitch my 4000lb trailer to it, it sags of course, then I just fill the air springs back to highway height and it rides great.
I think the amount of weight that it would take to max out the Air springs would have long since crushed the chassis.
I say go for man. Air suspension is so much more adaptable for any situation that your XJ can be in.

You just basically sold me 😅 planning to pull a 4000lb-4500lb 26í travel trailer (with load distro and electric brakes). And iím a cheap mfer, $220 for air springs is still a lot better than $2700 lol. I can do a lot more than just airbags towards that towing goal with $2700 invested (disc brake swap/upgrades, 1 ton steering, 2Ē lift)

Maybe if i hit the lottery one day iíll build up an XJ proper...or just go buy an SJ grand wagoneer and drop a newer pushrod V8 into it 🤣


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  #13  
Old January 29th, 2022, 11:08
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Skruffy Skruffy is offline
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Airbags/air springs for rear ride control and load calculations

Glad to hear it
Towing 4000lbs with an XJ is not for the faint of heart. Having working breaks in the trailer is absolutely needed. Upgraded brakes on the Jeep are needed too if you have bigger tires. Iím running 35ís on TJ rubicon axles. I couldnít lock up the front brakes until I did the VANCO upgrade.
My chassis was rated to tow 5000lbs but that seems like a fantasy even after the engine swap.
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  #14  
Old January 29th, 2022, 12:01
Woodswanderer Woodswanderer is offline
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Airbags/air springs for rear ride control and load calculations

Quote:
Originally Posted by Skruffy View Post
Glad to hear it
Towing 4000lbs with an XJ is not for the faint of heart. Having working breaks in the trailer is absolutely needed. Upgraded brakes on the Jeep are needed too if you have bigger tires. Iím running 35ís on TJ rubicon axles. I couldnít lock up the front brakes until I did the VANCO upgrade.
My chassis was rated to tow 5000lbs but that seems like a fantasy even after the engine swap.

Its not going to be an all the time thing. Planning to do the WJ front brakes, ZJ rear discs, fully worked suspension on 2Ē lift with nokian 235/75-15 e load index tires. Reese towing hardware rated to 5500lb. Pretty sure iíll be running in full time 4wd too to pull this much.

Door tag says im rated to 4900lb capacity in stock form on 215/75-15 tires...thats a huge stretch imho.

Really only need to be able to move the trailer to land and occasionally off the land. The 4.0 while being a great engine is a bit underpowered for that much weight and iíd be much better served with a v8 swap (but that kills half the fun and takes the reliability of the 4.0 out of the equation...this is still a daily driver first and foremost)
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  #15  
Old January 30th, 2022, 12:36
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Skruffy Skruffy is offline
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Airbags/air springs for rear ride control and load calculations

Go for it man. Put the build on here I am real interested to see how it works out.
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