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06-02-2018, 11:44 PM | #1 |
Registered User
Join Date: Oct 2007
Location: Saskatoon
Posts: 138
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Uneven Air bag pressure
I’m running a triangulated 4link on the back of my ‘55 with an accuair setup. For some reason I have way more pressure in one air bag than the other to keep truck level. Any ideas? Each side is set up exactly the same and am running the Firestone sleeve type bags.
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"Lifes to short to drive an ugly truck." Project 55 To Life http://67-72chevytrucks.com/vboard/s...d.php?t=432994 |
06-03-2018, 10:28 AM | #2 |
meowMEOWmeowMEOW
Join Date: Sep 2009
Location: MKE WI
Posts: 7,128
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Re: Uneven Air bag pressure
Is there significantly more weight on that side? (relocated battery etc). A few more psi to compensate for weight isn't strange. How much pressure differential are you seeing?
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06-03-2018, 05:43 PM | #3 |
Senior Member
Join Date: Jan 2011
Location: Hayes Va
Posts: 4,569
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Re: Uneven Air bag pressure
Preload in the 4 link. Are the links adjustable?
Jimmy
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60 to 66 Chevy and GMC window decals http://67-72chevytrucks.com/vboard/s...d.php?t=661131 Good friends, good food and a hotrod what else do you need? 1966 BBW long fleet Daily driver 1965 BBW short fleet Sold and going to a good home 1965 Suburban 2003 3500 Duramax 2005 Ultra Classic |
06-03-2018, 05:50 PM | #4 |
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Join Date: Oct 2007
Location: Saskatoon
Posts: 138
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Re: Uneven Air bag pressure
Weight is even, battery is actually on the side with less pressure.
What do you mean by preload in the four link?
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"Lifes to short to drive an ugly truck." Project 55 To Life http://67-72chevytrucks.com/vboard/s...d.php?t=432994 |
06-03-2018, 11:32 PM | #5 |
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Join Date: Jul 2009
Location: San Jose Ca
Posts: 2,871
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Re: Uneven Air bag pressure
You can adjust the load on the suspension by lengthening or shortening links.
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David Used parts build: http://67-72chevytrucks.com/vboard/s...d.php?t=638991 My brother's Nova: http://www.67-72chevytrucks.com/vboa...d.php?t=727985 Rear suspension rework: http://www.67-72chevytrucks.com/vboa...d.php?t=750557 Instagram: myfabguy |
06-05-2018, 07:47 AM | #6 |
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Join Date: Jan 2011
Location: Hayes Va
Posts: 4,569
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Re: Uneven Air bag pressure
Here is a great video on preload. The entire series is good. Yes it is drag racing but it all applies in understanding how all this works.
Jimmy https://www.youtube.com/watch?v=yMY-8_lBTZ4
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60 to 66 Chevy and GMC window decals http://67-72chevytrucks.com/vboard/s...d.php?t=661131 Good friends, good food and a hotrod what else do you need? 1966 BBW long fleet Daily driver 1965 BBW short fleet Sold and going to a good home 1965 Suburban 2003 3500 Duramax 2005 Ultra Classic |
06-05-2018, 07:32 PM | #7 |
Registered User
Join Date: Apr 2001
Location: DALLAS,TX
Posts: 22,066
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Re: Uneven Air bag pressure
It doesn't seem quite so simple in reality. What about if the front requires a different amount of air psi for each side??
I get adjusting preload, but it seems there would be WAY more to it on a street based 4-bar set-up vs. that race oriented 4-link. Typical street air suspension 4-bar set-ups w/poly type bushings @ each end aren't as adjustable (most only allow adjustment @ one end) & they're definitely not going to easily rotate to know if there's pre-load before making any adjustment. When I did the 4-bar for my dually, I made jigs for the upper bars length (& lowers) to know each side/all 4 were equal/exact. I then installed everything & measured for square. I tweaked as necessary for getting things perfectly square. When they did the alignment, one thing I was worried about was the rear thrust angle & the 2 techs that did the alignment were impressed w/how tight/close the thrust angle was where I was afraid I might be off. The alignment went w/o issue. But, my truck requires 10psi split up front & 20psi split out back. Also.... it's on opposing sides (pass front requires more psi; drivers rear requires more psi to be dead equal @ all 4 corners as measured @ the wheel opening lip (measurements validated pre suspension swap as well). Thoughts?
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06-06-2018, 12:47 AM | #8 |
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Join Date: Jul 2009
Location: San Jose Ca
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Re: Uneven Air bag pressure
PG thanks for that link. I didnt know about all of his videos. Ive been watching non stop for an hour.
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David Used parts build: http://67-72chevytrucks.com/vboard/s...d.php?t=638991 My brother's Nova: http://www.67-72chevytrucks.com/vboa...d.php?t=727985 Rear suspension rework: http://www.67-72chevytrucks.com/vboa...d.php?t=750557 Instagram: myfabguy |
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