Air Suspension – My Airrunner setup and system plans

I posted this up on the Club Lexus forum recently and thought it would be useful here also.

I have an Airrunner air suspension setup on my 2000 LS400. It’s a nice system but I have a couple minor issues with it. I run the fronts around 110psi and the rears around 60psi on nice pavement, 120/80 on rough/uneven surfaces.

Full up:

My LS400 - Nearly full inflation

My LS400 - Nearly full inflation

Laid out:

My LS400 - Laid out 1

My LS400 - Laid out 1

My LS400 - Laid out 2

My LS400 - Laid out 2

My LS400 - Laid out 3

My LS400 - Laid out 3

Setup:

  • Two tanks. Not sure exact size, 5? gal each
  • Single 120psi Airruner branded Firestone compressor
  • 1/4 line to 4 manual switches and 1/4 line to bags/cylinders
  • Dual pressure gauges (and switches) mounted in center console.

Sry no picture of the trunk for now, but it’s nothing special, tanks and comps in spare tire well.

Thoughts
My main gripe is how slow the current setup is to lift the car (and deflate the rear). This is from the 1/4 lines. Slightly annoying while driving and need to quickly lift the car, but it’s more annoying when the car is laid out and you need to go back to ride height. Due to the install, my manual switch placement sucks – they are hard to get at in the center console. For those that don’t know, manual switches dump the air from the bags right out of the switch itself, so as you’d expect it’s very loud in the car when deflating… My GF and kid complain. Of course the manual valves have no way to program preset heights, or auto fill on startup, both features I’d really like. Lastly, the single 120 compressor is taxxed to fill both tanks, it will run for >= 10+ minutes after lifting the car off the floor. If the tank was low/empty when laid out, you have to wait awhile before being able to drive anywhere. But other than these minor, correctable issues, the Airrunner setup is awesome.

Plans
I’m planning to upgrade to the system to

  1. Make it faster and easier to use (programmable heights)
  2. Make it quieter inside the cabin (and louder outside the car)
  3. Provide a little redundancy AND reduce tank recovery times.
  • Upgrading compressor to either a single or dual Viair 480C compressor, they’re good for 200psi@50%duty. Much faster tank recovery!
  • Upgrading to at least 1/2 line from the tank to the manifold/valves. The single 1/4 line from the tanks is over taxxed when filling 2 or 4 bags at once
  • Upgrading to trunk mount electric valve setup (Accuair?) with slow-downs/mufflers on exhaust ports. Quieter cabin, and allows presets with controller
  • Upgrading to programmable digital controller, still researching but leaning toward the Autoloc Air Command
  • Get rid of analog gauges in favor for a digital display setup that also shows tank pressure
  • Keeping 1/4″ lines from valves to struts, if the new setup still isn’t fast enough I’ll sell the Airrunners and go with a custom UAS setup with >= 3/8 lines
  • Haven’t planned out what to do for water traps or drains, but that stuff along with fittings and air hose is fairly generic

Hope this helped!

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