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My Custom Air Suspension Install - 99 Trans Am

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Old 08-17-2010, 12:10 AM
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The main advantage of the sleeve bags in the rear is the amount of travel you get. The rear axle can move 8" up and down and the sleeve bag has about 8" of travel as well.

Double convoluted bags tend to have only 5"-6" of travel. So if you set it up to drop the car all the way you won't be able to lift it up fully. It will be 2"-3" shy of full extension.

What does a floating cup look like?
Old 08-17-2010, 12:43 AM
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Originally Posted by ZTwentyAteU
."The loss of head pressure on the fill valves will cause them to open and all FOUR bags will deflate, dropping the car and possibly leading to an accident"


this is the one disadvantage to using a solenoid valve. I've had this happen and thats why people should triple check everything on their air suspension when building it.

I recently had a left front bag develop a decent sized leak on my 66 impala, on the hot rod power tour 2010, on the interstate at 75. It wouldnt be such a big deal in some cars, but mine lays flat out...so it had to be raised..over and over and over and over..so I used up all my head pressure to get it off the interstate..came in to a pilot station dragging the hell out of it
I've seen non-DOT approved tanks burst. The loss of pressure caused all the valves to open and the vehicle to drop. That's why you want to use a good tank as well as check valves in the lines. That way the pressure in the lines will keep the valves closed in case the tank should lose pressure. If a line leaks it can be patched by cutting out a section and adding a metal splice, but there's not a whole lot you can do if the bag develops a leak. Buy good quality bags I guess?
Make sure it doesn't rub anything. That's about all.

I wish there were a spool valve that would work well with air bags. When it's closed, it doesn't need pressure to stay that way, plus it can serve as fill and dump in the same unit. I only know of one company using spool valves in a manifold and they are said to be leaky and limited in pressure handling.

One thing I will be changing in my setup is replacing the plastic line on my front bags to a short length of braided line. I've heard that plastic line is not made for moving parts and will eventually fail. If I turn my front bags upside down so that the air fitting is on top it won't be moving at all. It will be in a fixed position. So I might do that instead.

Last edited by JasonWW; 08-17-2010 at 12:49 AM.
Old 08-17-2010, 02:12 PM
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Originally Posted by JasonWW
The main advantage of the sleeve bags in the rear is the amount of travel you get. The rear axle can move 8" up and down and the sleeve bag has about 8" of travel as well.

Double convoluted bags tend to have only 5"-6" of travel. So if you set it up to drop the car all the way you won't be able to lift it up fully. It will be 2"-3" shy of full extension.

What does a floating cup look like?
Thats not always the case, you can get a Slam Specialties RE7 or some of the newer slam double convoluted bags in 5-8in. They actually get hella lift with less pressure. But the sleeve is much thinner and may fit the pocket better.

A floating cup looks like this
you bolt the bag to the cup and the cup rests in the spring pocket. Very simple, can be made with some pipe and flat plates, or bought for 39.99 at suicidedoors or the like.

Old 08-17-2010, 02:55 PM
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Originally Posted by ZTwentyAteU
Thats not always the case, you can get a Slam Specialties RE7 or some of the newer slam double convoluted bags in 5-8in. They actually get hella lift with less pressure. But the sleeve is much thinner and may fit the pocket better.
The bags I mentioned above having only 5"-6" of lift are the ones that would come close to fitting. You need about a 5" diameter bag and a double convoluted doesn't have the range.

The floating cups are overly complicated. By the time you modify them to work with the f-body rear you'd be better off making the brackets like I showed in post #33. https://ls1tech.com/forums/11666083-post33.html

Last edited by JasonWW; 08-17-2010 at 03:01 PM.
Old 08-18-2010, 12:01 AM
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Originally Posted by JasonWW
The bags I mentioned above having only 5"-6" of lift are the ones that would come close to fitting. You need about a 5" diameter bag and a double convoluted doesn't have the range.

The floating cups are overly complicated. By the time you modify them to work with the f-body rear you'd be better off making the brackets like I showed in post #33. https://ls1tech.com/forums/11666083-post33.html

I sorta disagree on the cups part. I'm not thinking they need much modification except maybe cutting them down shorter and cutting a hole in the side for an airine., or running the line straight up in the car. the cup just sits just like a factory spring would in the pocket.
Old 08-18-2010, 12:46 PM
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Damn that car looks sick on the ground..
Old 08-22-2010, 04:37 PM
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Ok so I dont know **** about air ride. This is what i have so far

http://cgi.ebay.com/ebaymotors/ws/eB...=STRK:MEWNX:IT

http://cgi.ebay.com/ebaymotors/ws/eB...=STRK:MEWNX:IT



I have a feeling I need something else...
Old 08-22-2010, 11:34 PM
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not sure if this matters to anyone in here, but I found out the 12v air compressors you can get at harbor freight use the exact specs as a viair 450 compressor. worth a try
Old 08-23-2010, 09:44 AM
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a sleeve bag will have a lil softer ride in the rear of the car over the double convoluted
Old 11-14-2010, 08:25 PM
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Here I thought I was the only one with the idea of building an exotic "super car" version of a Trans Am
Old 11-14-2010, 09:11 PM
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The build is going great soo far.. that stance looks killer!!
Old 03-10-2011, 02:11 PM
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Just a quick update. I'm made some new bag mounts from laser cut steel to replace my craptacular, crooked, hacked together black ones.

Here's the old:

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Here's the new:

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After bondo:

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Last edited by JasonWW; 03-10-2011 at 02:17 PM.
Old 06-01-2011, 09:57 PM
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Sorry guys, I sorta forgot about this thread.

I'm redoing everything up front. Building a whole new front suspension from scratch without the shock towers. Short aluminum spindles with vette hubs. New fabbed up lower control arms, new adjustable upper arms, different style of bag, different shocks, etc...

The first several pages are pretty old, so skip to the last few.
https://ls1tech.com/forums/suspensio...t-spindle.html
Old 02-02-2012, 05:16 PM
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has anyone tried this? It seems like the best mod to do in your car suspension wise
Old 02-11-2012, 09:03 AM
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Do the bumpers scratch when you lift one side and then the other? Like, if you lift the back first, does the front bumper hit the ground? Is it just a matter of doing them bit by bit back and forth? Is there a way to make both sides go up at the same time?
Old 02-25-2012, 11:30 AM
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Originally Posted by ChadDub
Do the bumpers scratch when you lift one side and then the other? Like, if you lift the back first, does the front bumper hit the ground? Is it just a matter of doing them bit by bit back and forth? Is there a way to make both sides go up at the same time?
There is no scratching. It's not sitting all the way on the ground. Not yet anyway.

As far as controlling how it raises and lowers you can put valves on each wheel and set up switches to control any combination of valves you want. Like one toggle to raise all 4 corners or just the left side or both front, etc... That's pretty easy to setup afterwards.
Old 08-01-2013, 10:36 AM
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If you made the brackets I would pay!!
Old 10-11-2013, 04:45 AM
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are'nt there rear air bags that fit inside the springs and just sit on the spring perches?
Old 04-27-2014, 09:25 AM
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I have a complete kit for sale if anyone is interested

https://ls1tech.com/forums/parts-cla...l#post18157893
Old 03-29-2016, 05:52 PM
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I hate to drudge up an old thread but what did you end up having to do to get the R4 Compressor to work with as an engine driven compressor?



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