I just took my airbags off of my truck

boogie_4wheel wrote:
For your 'ping tank', temporarily plumb in one of those 5g tanks from Harbor Freight for $30.

I did not know what a ping tank was when I first came across the term and had to do some research on it. A ping tank is a small tank in the air line near the air bag with nothing but open hose inbetween. The purpose is to give the air in the bag somewhere to go as the bag compresses so that the spring rate is not increased as rapidly. Five gallons would be gross overkill, I am thinking something between a pint a quart would be good.

Example: If your truck is at rest with the airbag 50% compressed and you hit a bump that pushes the bag to 90% even if you start with no pressure in the bag (just normal atmospheric pressure) the bag pressure will jump to 60PSI. If you start with 30PSI in the bag and go to 90% compression the bag pressue will jump to 200PSI. The use of a ping tank the same volume as the bag was at rest those pressures at 90% will only jump to 12PSI and 55PSI respectively. The bigger the ping tank the smaller the increase will be. Whether that is good or bad depends on what you are looking for but as long as you don't bottom out you will soften the ride.