StanceWorks » Tech » Air Ride Suspension - Sponsored by AirLift

[SourSamo]

Hoping someone can give me a hand.
I have an 08 BMW 335i with an AirRunner kit and am having issues with the rear bags.
Bags
Viair 400c compressor
5gallon tank
Accuair VU4 manifold to bagriders switch box

The fronts are awesome, way up and way down.
The rears only go up very little then stop. If I run the compressor and fill the tank up, it will go up a little bit more, but nowhere near what the fronts are.

Anyone have any ideas?
Bags look like this;

[NegativeCamber]

try a check valve in between each fill line for the rears.....

[Rali@BagRiders]

Originally Posted by NegativeCamber

try a check valve in between each fill line for the rears.....

Wait, what? Then he wouldn't be able to air out.

What pressure are you running as your tank cutoff and how much pressure is in the rear bags when you're at 'full lift'? Tapered sleeve bags like that should give you plenty of lift. Is the bag geting stuck on something that isn't allowing it to expand fully?

[NegativeCamber]

Originally Posted by Rali@BagRiders

Wait, what? Then he wouldn't be able to air out.

What pressure are you running as your tank cutoff and how much pressure is in the rear bags when you're at 'full lift'? Tapered sleeve bags like that should give you plenty of lift. Is the bag geting stuck on something that isn't allowing it to expand fully?

I said that wrong...Meaning the line from the tank that feeds the valve at each corner

[SourSamo]

Originally Posted by Rali@BagRiders

Wait, what? Then he wouldn't be able to air out.

What pressure are you running as your tank cutoff and how much pressure is in the rear bags when you're at 'full lift'? Tapered sleeve bags like that should give you plenty of lift. Is the bag geting stuck on something that isn't allowing it to expand fully?

I'm assuming when aired up the bag would fully extend past the collar correct? Like this

It seems like that is really hard to do and even with the bag out of the car and giving it full pressure it never extends out.
Old bag maybe?

[Rali@BagRiders]

Hm, that's odd. I'm not too familiar with the Air Runner bags for the e92's. Since they are tapered sleeve bags, yes I would expect them to extend out much like the Air Lift's you posted. The age of the bag shouldn't have anything to do with the way they extend or compress.. Did you try contacting Air Runner about the issue?

[SourSamo]

Yeah he said to check for leaks and try replacing the bag fittings.
Going to try that tonight, but in my mind that doesn't seem right.

Thanks for all the help!

[Rali@BagRiders]

Sure thing, let us know how that turns out!

[bobbyjones]

there might be a banana in your tail pipe (insert smiley face here)

[SourSamo]

Replaced the fittings, no difference.
I'm thinking I need to replace the rear bags, does anyone know what rears that e92 on air society is running?

[Rali@BagRiders]

Originally Posted by SourSamo

Replaced the fittings, no difference.
I'm thinking I need to replace the rear bags, does anyone know what rears that e92 on air society is running?

That's actually one of our cars. It's on a prototype Air Lift setup right now and we're still tweaking it so that kit probably won't be available for a while. If you wanted a complete bolt in rear setup, we can get you the Air Force e92 rears which go very low.

[HPG-Matt]

Originally Posted by SourSamo

Replaced the fittings, no difference.
I'm thinking I need to replace the rear bags, does anyone know what rears that e92 on air society is running?

your other option would be the airrex rears

[Rali@BagRiders]

Originally Posted by matt@hardparkergarage.com

your other option would be the airrex rears

Truth, we can provide those as well!

[SourSamo]

Throwing another $1000 at this is a hard pill to swallow.
I dunno, it's like the bag is catching or the way it is positioned won't let it extend completely.

The kit has a round cup that attaches to the bottom through the control arm, but I don't have the install papers to know which way the cup needs to be positioned.

[Rali@BagRiders]

Have you tried taking one of the rear wheels off and jacking up that corner to see how the bag compresses? You'll need to have some air in the bag when you do this so it folds over itself properly. That should give you a good idea of what you're getting hung up on.

[SourSamo]

Without load on the car and jacked up the rears do inflate quite a ways, but rub against the shock.

When the car is down the bags barely inflate so may be a pressure thing.
Going to try a higher psi sensor and see if that helps.

[Rali@BagRiders]

They rub against the shock? That's not good..

What pressure do you have in your rear bags at 'full lift' when the car is on the ground?