bag questions - The 1947 - Present Chevrolet & GMC Truck Message Board Network

salvageit · 01-08-2008, 09:25 AM

Whats up guys, just have a few questions about my bag set up. I have a 72 sub with a big block. My bags are easy street (air lift) 300 psi bags with 1/2 inch ports. so far I have not beeen able to get them to lift the front up but I have only been able to get 100 psi in them. If I lift the front and then air them up they will hold it up. The rear airs up very quick ( 1/2 inch ports). I have a york compressor that I have not yet mounted, how much pressure do you think I can build with york. Also what bags and pressure are ya'll running with your big blocks?

RunninLo · 01-08-2008, 06:19 PM

My shop truck is a 92 dually with a 454 and when it was first bagged it had a thomas 315 with 1/4 inch lines and the paddle valves... same deal as you wouldn't get up but would stay up if helped with a jack.

I kept the same bags (FS224c) and mounts but switched to a Viair 450 and 3/8ths valves. with 3/8ths line. It sits like a brick till about 110-115 lbs but then "pops" up to almost full lift. the rear has never had any problem even with a trailer on.

Josh

Frizzle Fry · 01-09-2008, 05:57 AM

Slam RE7's here. I'm not laying frame but it only takes about 40#s to start lifting my front end (with a 476). I ride at about 70# (will be less when I can ride lower). 1/2" valve/lines with needle valves. Tank pressure switch is set to 150#.

19723DR · 01-09-2008, 07:11 PM

Mine has a small block, but it still takes 70+psi to start to lift. I usually drive at 80 or so. My bags are FS2600's. Sometimes when I air up the front, the bag gets "stuck". It takes a higher pressure to break the seal created by the wieght of the truck and engine. The larger wieght of a big block will increase the ride height pressure. The rear of the truck weighs less, therefore taking less psi to lift. I drive with the rear at 30 - 40 psi.

69panel · 01-12-2008, 04:49 AM

My 69 panel takes 110 psi to get the front to start moving up because it seems to get stuck after being aired out. I run the fronts at 125 psi and the rears at 60 psi. The rears come up very quickly. I'm running a Chrysler V-2 A/C compressor with the expansion valve removed and the cut off at 150 psi.

01-08-2008, 09:25 AM	#1
salvageit Registered User Join Date: Aug 2007 Location: Ogden, Utah Posts: 38	bag questions Whats up guys, just have a few questions about my bag set up. I have a 72 sub with a big block. My bags are easy street (air lift) 300 psi bags with 1/2 inch ports. so far I have not beeen able to get them to lift the front up but I have only been able to get 100 psi in them. If I lift the front and then air them up they will hold it up. The rear airs up very quick ( 1/2 inch ports). I have a york compressor that I have not yet mounted, how much pressure do you think I can build with york. Also what bags and pressure are ya'll running with your big blocks?

01-08-2008, 06:19 PM	#2
RunninLo 3DrDwn--the 'burb not the band Join Date: Jan 2007 Location: missoula, mt Posts: 598	Re: bag questions My shop truck is a 92 dually with a 454 and when it was first bagged it had a thomas 315 with 1/4 inch lines and the paddle valves... same deal as you wouldn't get up but would stay up if helped with a jack. I kept the same bags (FS224c) and mounts but switched to a Viair 450 and 3/8ths valves. with 3/8ths line. It sits like a brick till about 110-115 lbs but then "pops" up to almost full lift. the rear has never had any problem even with a trailer on. Josh __________________ Slo and Lo that is the tempo. '72 burb build page here: http://67-72chevytrucks.com/vboard/s...d.php?t=259256 '89 GMC Dually crew build page coming soon. 88 4x4 crew DD duallys past/present pics here: http://67-72chevytrucks.com/vboard/s...46#post4001246 89 1 ton Dually rear flip kit install here: http://67-72chevytrucks.com/vboard/s...d.php?t=354327

01-09-2008, 05:57 AM	#3
Frizzle Fry Registered User Join Date: Aug 2005 Location: Hillsboro Oregon Posts: 6,449	Re: bag questions Slam RE7's here. I'm not laying frame but it only takes about 40#s to start lifting my front end (with a 476). I ride at about 70# (will be less when I can ride lower). 1/2" valve/lines with needle valves. Tank pressure switch is set to 150#.

01-09-2008, 07:11 PM	#4
19723DR Registered User Join Date: Oct 2007 Location: Salt Lake City Posts: 628	Re: bag questions Mine has a small block, but it still takes 70+psi to start to lift. I usually drive at 80 or so. My bags are FS2600's. Sometimes when I air up the front, the bag gets "stuck". It takes a higher pressure to break the seal created by the wieght of the truck and engine. The larger wieght of a big block will increase the ride height pressure. The rear of the truck weighs less, therefore taking less psi to lift. I drive with the rear at 30 - 40 psi. __________________ 72 Suburban 3 Door http://67-72chevytrucks.com/vboard/s...d.php?t=265728 family fun cruiser 71 Cheyenne Project http://67-72chevytrucks.com/vboard/s...d.php?t=299232 Almost finished 93 Silverado http://www.67-72chevytrucks.com/vboa...d.php?t=378258 Flamed, bagged, body dropped on 22's 98 Chevy short bed DD 97 Z71 3 Door 51 Suburban-S-10 swap "What other hot rod can you carry 7 of your friends in"

01-12-2008, 04:49 AM	#5
69panel Registered User Join Date: Jun 2001 Location: Gainesville, GA Posts: 823	Re: bag questions My 69 panel takes 110 psi to get the front to start moving up because it seems to get stuck after being aired out. I run the fronts at 125 psi and the rears at 60 psi. The rears come up very quickly. I'm running a Chrysler V-2 A/C compressor with the expansion valve removed and the cut off at 150 psi. __________________ '52 Buick Special Dlx 2dr. sedan, '68 Camaro '69 C-10 Panel, '07 Toyota Taco SR-5 "Try to be the person your dog THINKS you are" Last edited by 69panel; 01-12-2008 at 04:51 AM. Reason: forgot something



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