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Old 02-27-2011, 01:57 PM
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Can Suspension On-Board Compresor be used as Alt Air Compressor

The Optional Air Suspension includes an air compressor dedicated to the sealed air suspension tank & suspension. Is there an after market component (switch & value) that would allow the compressor to be used for standard air compressor uses: refilling tires if deflated for off-road, rafts, sport balls, etc.

I realize you can add an on-board compressor or an AC plug-in mini-compressor; just thinking if it's there for the ride, can it be utilized.
Had a few in past that provided that feature with OEM compressor and found it a rare but handy feature!
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Old 02-27-2011, 02:09 PM
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Re: Can Suspension On-Board Compresor be used as Alt Air Compressor

no way that i would. I wouldnt chance any more strain on the system.
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Old 02-27-2011, 02:48 PM
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Re: Can Suspension On-Board Compresor be used as Alt Air Compressor

No, it is not designed to be used that way. Per allpar website:
http://www.allpar.com/trucks/jeep/2011-cherokee.html


"There is a front compressor in the system, but it’s only present for repressurizing the system after it has been serviced, while connected to a nitrogen tank (using a hose behind the rear seat)"
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Old 02-27-2011, 02:57 PM
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Re: Can Suspension On-Board Compresor be used as Alt Air Compressor

The WK2 has a closed circuit high pressure (up to 220 psi) nitrogen suspension system, probably the most advanced of its kind currently available in any production vehicle.

As usual, WK2jeeps.com provides a complete description of the system:

http://www.wk2jeeps.com/wk2_quadralift.htm

Do not tap into it!.
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Old 02-27-2011, 08:30 PM
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Re: Can Suspension On-Board Compresor be used as Alt Air Compressor

Yes it can but only once and then your Jeep is broken and you may be missing a limb... LOL
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Old 02-28-2011, 01:03 PM
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Re: Can Suspension On-Board Compresor be used as Alt Air Compressor

Laughing with ya! I knew it was a closed system, thus the reason for my question.
I'm often surprised what's already been developed as custom and I've enjoyed reading the ideas & innovative mods this site stimulates and was curious if anyone has played with this tangent.
I am one of the orphans without WK2 waiting for 730 RHR supply. I personally "haven't studied" the Jeep/Mopar system. I am familure with air suspension (Ag, Heavy Eq & Automotive: Porsche & GM), hydraulics, and various methods to apply compression to gas & liquid.
I don't feel the system would be strained based on PSI, as pointed out above it's working with high PSI for the closed system. It has a pump capable of delivering hi-compression although volume and duty cycle are unknowns.
Not knowning the Jeep system and if pump is inside the closed system, then ALL this is "Humor of Discussion" because the cost & custom work to revalve & switch would be prohibitive compared to more acceptable alternatives.
If the pump is outside the closed system utilzing a diaphragm or sub-charging tank; it's not pumping closed system nitrogen and would allow easy service and R&R of pump components without vaccuum & refilling. For an off-road rig, this might have been designed into the system. Don't Know & curious.
If pump is outside closed system, then pump volume & duty cycle would need to be known to safely operate within the design specs of pump. If it's outside, compression diversion valves and alternate supply lines would be extremly simple and useful.
Again, I don't know the Jeep Susp System, no WK2 to visually inspect, not important enough look up & read shop manual; and basically had a brain fart idea and curious if anyone else has entertained a similar idea.
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Old 05-28-2013, 09:56 PM
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Sorry to bring this thread back up, but just getting a 2014 JGC made me think the same thing. Im sure most jeep owners use their vehicle for more... sports, cycling & off-roading all of which would benefit from an on-board air compressor. Just saying it would be a cool feature that's already built in anyway.
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Old 05-29-2013, 03:25 PM
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Re: Can Suspension On-Board Compresor be used as Alt Air Compressor

The suspension compressor is tiny, is light duty and does not have much capacity. It is designed more to move a little air and produce high PSI. It has trouble keeping up with even a minor leak without overheating. You't have better performance with a $20 12VDC plug in air compressor.

BTW QL is not an entirely closed system. It will draw air in to make up for losses.
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Old 05-29-2013, 03:32 PM
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Re: Can Suspension On-Board Compresor be used as Alt Air Compressor

Quote:
Originally Posted by ColdCase View Post
The suspension compressor is tiny, is light duty and does not have much capacity. It is designed more to move a little air and produce high PSI. It has trouble keeping up with even a minor leak without overheating. You't have better performance with a $20 12VDC plug in air compressor.

BTW QL is not an entirely closed system. It will draw air in to make up for losses.
Where did you read that?

According to every piece of literature and info I have seen it's completely self contained and does not draw in or expel any air/gas.

Jeep Grand Cherokee WK2 - Quadra-Lift Air Suspension system

"A closed system - because it's better

Quadra-Lift is a closed system so adjustments are much faster than other systems that must draw in or exhaust air for operation. It is the first SUV to use the latest air suspension technology utilizing a closed type design.

The closed type system does not draw in fresh air during vehicle lifting or leveling-up, or pump air out to the atmosphere during lowering or leveling down. Instead it moves stored pressurized air from the reservoir to the air springs and back again.

Since the system's compressor is working with pre-pressurized air, and not air at atmospheric pressure, the compressor can be smaller which translates into reduced power consumption and weight as well as improved NVH characteristics. Pressurized air is moved between the reservoir and the springs by way of an air supply unit (ASU). The ASU consists of an air compressor and a valve block assembly that is plumbed to the springs with a network of lines. The ASU valve block provides six color-coded pneumatic connections to the system. Four connections distribute or retrieve air from each of the air springs. One connection is the inlet from the compressor, and the last connection exhausts the system. The ASU also contains an intake / exhaust assembly with filter, onboard desiccant, a reversing valve, a temperature sensor, and a pressure sensor. It is important to note that the ASU is not designed to fill an empty system. The ASU's main function is to pressurize and move air that is already there.

Front and rear height sensors measure the distance between the body and suspension, and provide feedback to the control system to constantly monitor vehicle height. The air suspension control module (ASCM) contains the logic that controls ride height during all driving and loading conditions. The ASCM controls the ASU compressor and valve block, and is influenced by many other modules and systems. The powertrain control module (PCM), anti-lock brake system (ABS) control module, cabin compartment node (CCN), and drivetrain control module (DTCM) are all primary inputs to the ASCM.

By working with pre-pressurized air, the closed air suspension system also provides additional benefits to the customer:


Reduced time to change vehicle height
A significantly greater number of repeated lifts without lift time deterioration
System performance that is unaffected at higher altitudes when compared to an open type air suspension"
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Old 05-29-2013, 03:40 PM
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Re: Can Suspension On-Board Compresor be used as Alt Air Compressor

I thought the QL only used nitrogen.
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Old 05-29-2013, 09:14 PM
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Re: Can Suspension On-Board Compresor be used as Alt Air Compressor

Quote:
Originally Posted by Xjrguy View Post
Where did you read that?

According to every piece of literature and info I have seen it's completely self contained and does not draw in or expel any air/gas.
Yeah the devil is in the details. Perhaps you need to look in more detail at the specific components involved and how the system is put together. At the risk of over simplification, an open system is simply one that releases air to the atmosphere when reducing height and pumps air in from the atmosphere to increase height. A closed system moves air to/from holding tanks to adjust height.

The WK2 is technically a closed system but has provisions to adapt to small leaks and temperature changes by pulling in a little outside air. Granted when everything is working well it is a completely closed system, but there are provisions for leakage and gas expansion/contraction. They really don't want the streets littered with WK2s that have gone flat

If you have been reading only marketing literature, they pretty much gloss over those design details. Check out some of the QL discussions in 2011-2012 time frame of real world experiences, especially discussions of failures. Many an air compressor has over heated trying to pump in more "air" to make up for a slow leak. Check out the service manual description.

BTW air is like 80% nitrogen....
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Old 05-29-2013, 11:30 PM
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Re: Can Suspension On-Board Compresor be used as Alt Air Compressor

Ok I geek out on the minutiae so your response is interesting if it's accurate.

Thanks.
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