I want to add a small compressor to my truck to keep the rear level. It has air shocks but no automatic control.

If I can find a decent priced string pot I can make it fully automatic. for now I need to select a compressor.

I have a few factory ones and a bunch of aftermarket tire pumps. You cant believe the hyped up ratings so I made a simple arduino test rig to sample the pressure every 100 milliseconds and decided to test every one I can get my hands on….

heres the test setup using a battery, pressure sensor, safety cutoff switch and a few other parts…..

and heres the lot of compressors I grabbed from the junk bin and all the cars outside.

There’s this monster from a Caddy Deville.  It even has the solenoid to drop the suspension attached.

A bare frame from a factory air suspension: Not the fastest but its the one I’m using for my suspension.  Its beefy and runs at a lower speed than the others so it will be quieter… Plus it has two 1/8 npt ports on the head that will make plumbing a breeze.. I probably should print up a belt guard for it.,,,,

a very old compressor from the 80’s

what I thought was a cheapie model but turned out better than expected so I gave it a brand new gauge and 3D printed a new cap for the head…..

A left over from a project. Its a cheap aftermarket car compressor with a 3D printed base…

Real cheapo flea market garbage. wouldn’t hit 200psi if I kinked its hose with vice grips…….

A nice $5 flea market one thats going back in my wagon…

A real surprise is the harbor freight model. It was #2

by far the best and most expensive one I have. Its made by slime. Its big ugly and fast and I keep it in my truck

and the results:

  1. Slime
  2. Harborfreight
  3. Interflator

the rest were about even.

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