air issues

I got this bu on air and have an issue maybe ya'll can finger out.


It's front/rear setup only, when the fronts up and I raise the ass the front bags deflate some like it;s backfeeding. And when I try raising the fronts it comes up maybe 2" then I gotta wait a minute and hit it again for another 2", but it's not draining the tank while doing it. Whats the deal?


And are extreme450 valves any good?

if you have the 450s change them they leak bad...cant run alot of pressure.

What are you running for pressure?

Also how is it plummed.

700 psi SMCs 320 shipped...that is 40 a piece, the lower rated ones are 54.

You need to have paypal though...call Suicide Doors and ask them about it.

it was a nitrogen setup but within the last couple weeks was changed to a compressor.

It doesn't have a pressure gauge for the tank but it's a 150psi pressure switch. And nothing leaks so why change anything just yet?

I looked around under the car and got lost.. my first bagged car it's got the 4valves ran inline and I'm gonna guess everything is t'd off rather than independent since only front/rear?

It's all copper tubing, any issues with that?

Sounds like it's just backfeeding to me. everytime you lift the rear, the pressure that's on the backside of the front valve is lost, and the pressure between the valve and bags in front is greater, and leaking back through. And as far as it taking so long to lift, where are the valves for the front mounted? You gotta think, the farther away the valve is from the bag, the longer it will take to fill the bag. The tanks may have 180 psi, but if it has 10ft to travel from the valve to the bag, by the time it gets there, that pressure has dropped....

Is there check valves between the fill valves and the tank? I had smc's without check valves and if the tank pressure would drop, i.e. lifting the rear, the front would drop till the pressure equalized on both sides of the valve. Did it real bad while driving once when I lost all the air in the tank real fast and the front layed out going about 50 mph.

all the valves are mounted on the frame rail under the drivers seat. No there's not any check valves either.

The backfeeding I understand but why would the front come up 2" and then ya gotta wait another minute or so then hit it again for another 2"? When trying to raise the front it's not draining the tank because the comp never kicks on. It worked fine with the nitrogen setup fwiw