Roll Bar Install
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From: Palatine, IL
Car: 87 iroc
Engine: 454 .030 over
Transmission: th-350
Axle/Gears: 9 bolt
Roll Bar Install
i got the cage finially started to be welded in, i got the 4 pt of the cage final fitted and tack welded in before it started to rain, im hoping to finish it tomorrow








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From: Orland Park, IL
Car: 1984 Z28
Engine: SLOW carbed ls
Transmission: TH400 with brake, 8" PTC converter
Axle/Gears: moser 9" 4.11
Re: Roll Bar Install
you ran your back bars a little more spread out than I did, if you would have moved them 2" in more then the whole plate can be welded to the gas tank hump instead of mounting the tab on that low channel section.
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Joined: May 2005
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From: Palatine, IL
Car: 87 iroc
Engine: 454 .030 over
Transmission: th-350
Axle/Gears: 9 bolt
Re: Roll Bar Install
yea, i wanted to keep the bars out futher to keep them more over the shock mounts, im planning on building a lil peice of metal that fiting on the end of the channel to cover that up
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From: Bertram (outside Austin), TX
Car: 87 GTA
Engine: L98
Transmission: 700R4
Axle/Gears: Dana M78 3.27 posi
Re: Roll Bar Install
What brand cage did you go with?
Last edited by Stephen; Jul 25, 2007 at 12:34 PM.
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Joined: May 2005
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From: Palatine, IL
Car: 87 iroc
Engine: 454 .030 over
Transmission: th-350
Axle/Gears: 9 bolt
Re: Roll Bar Install
its a s&w 8 pt. cage, im going to run the door bars hopefuly today but i got to patch the floor where its a lil rusty
Joined: Jan 2003
Posts: 949
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From: New Germany, MN
Car: 1986 Iroc
Engine: 5.3
Transmission: 4L80E
Axle/Gears: 9 Inch w/ 3.55
Re: Roll Bar Install
Maybe I am the only one to do this but I mounted my rear bars where he did but where it met up with the hoop I angled them towards the out side of the car. Kind of trying to trangulate the cage.
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From: Bertram (outside Austin), TX
Car: 87 GTA
Engine: L98
Transmission: 700R4
Axle/Gears: Dana M78 3.27 posi
Re: Roll Bar Install
Think of it this way. If you push directly on top of a bar, it is strong. Hard to compress.
Now, set it at a 45 degree angle, and push. It'll collapse much easier.
Try it with a soda straw. End to end, it won't compress, at an angle, it'll fold easily.
Triangulation is used as reinforcement for square spaces. It is stronger than nothing, but not as strong as it could be. As the suspension pushes on the mounting point, it is like pushing on that soda straw.
Last edited by Stephen; Jul 25, 2007 at 06:21 PM.
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From: New Germany, MN
Car: 1986 Iroc
Engine: 5.3
Transmission: 4L80E
Axle/Gears: 9 Inch w/ 3.55
Re: Roll Bar Install
BUT, in a compression sense, front to rear, you have actually WEAKENED them, in regards to the strength they provide.
Think of it this way. If you push directly on top of a bar, it is strong. Hard to compress.
Now, set it at a 45 degree angle, and push. It'll collapse much easier.
Try it with a soda straw. End to end, it won't compress, at an angle, it'll fold easily.
Triangulation is used as reinforcement for square spaces. It is stronger than nothing, but not as strong as it could be. As the suspension pushes on the mounting point, it is like pushing on that soda straw.
Think of it this way. If you push directly on top of a bar, it is strong. Hard to compress.
Now, set it at a 45 degree angle, and push. It'll collapse much easier.
Try it with a soda straw. End to end, it won't compress, at an angle, it'll fold easily.
Triangulation is used as reinforcement for square spaces. It is stronger than nothing, but not as strong as it could be. As the suspension pushes on the mounting point, it is like pushing on that soda straw.
You make a good point except for one thing. The bars are already at a 45 degree angle. Me angling mine towards the outside may not have helped but it should be just as strong as running them straight back. Or am I wrong?
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Last edited by grover85; Jul 25, 2007 at 09:56 PM.
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From: 51°N 114°W, 3500'
Car: 87 IROC L98
Engine: 588 Alcohol BBC
Transmission: Powerglide
Axle/Gears: Ford 9"/31 spline spool/4.86
Re: Roll Bar Install
Those rear bars are mounted roughly where I had mine on the rear part of the floor but I had the upper mounts more to the outside of the main hoop.
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From: Bertram (outside Austin), TX
Car: 87 GTA
Engine: L98
Transmission: 700R4
Axle/Gears: Dana M78 3.27 posi
Re: Roll Bar Install
Well, I was more referring to the pressure from below, being transferred to the upper loop. The way they are designed, they have a straight shot, through the bar, to the upper loop.
It was more of the sideways angle I was a bit concerned about, rather than the up/down angle. Make sense?
But your sideways angles are minimal.
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From: Boosted Land
Car: 92 Z28
Engine: Boosted LSX
Re: Roll Bar Install
Looks good. Good spot for the rear bars as said above also. Closer to the shocks the better.
Thats where I put mine also. Well alomst. Mine are real cose to the shock mounts.
Thats where I put mine also. Well alomst. Mine are real cose to the shock mounts.
Joined: Jan 2003
Posts: 949
Likes: 0
From: New Germany, MN
Car: 1986 Iroc
Engine: 5.3
Transmission: 4L80E
Axle/Gears: 9 Inch w/ 3.55
Re: Roll Bar Install
Thats an odd response. Wouldn't you want the bars over the rear spring mounts? I mean how much strain is really on your shocks?
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From: Maui, Hawaii
Car: 1984 Trans Am
Engine: broken 385sbc
Transmission: G-Force rebuilt T-5
Axle/Gears: Currie 9" Ford 4.30:1
Re: Roll Bar Install
i put my down bars right behind the shock mounts.. basically right above the spring perch.. thats what the instructions said.. haha
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From: Mass
Engine: 350 TPI
Transmission: A4
Axle/Gears: 3.23
Re: Roll Bar Install
Do you plan on putting the rear seats back in? if so you may run into an issue with the seat back hitting the rear bars. I had thos same problem. It was a brain fart on my part and only found out the hard way after it was as welded in. I ended up having to cut out the rear bars and have a custom set made up so I could fit my rear seats back in the car. Here is a pic o fmy setup:
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From: Boosted Land
Car: 92 Z28
Engine: Boosted LSX
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iTrader: (9)
Joined: Sep 1999
Posts: 3,871
Likes: 24
From: Mass
Engine: 350 TPI
Transmission: A4
Axle/Gears: 3.23
Re: Roll Bar Install
ya, you want a cage and I want to cut mine out. I cant stand it anymore. Its a major PITA when your trying to work inside your car. Im proberbly going to cut mine out and just throw some SFC on it instead.
Thread Starter
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Joined: May 2005
Posts: 334
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From: Palatine, IL
Car: 87 iroc
Engine: 454 .030 over
Transmission: th-350
Axle/Gears: 9 bolt
Re: Roll Bar Install
it is a pita, ive been putting in my interoir and ive been hitting my head and having to crawl through it like its a jungle gym...
Joined: Feb 2005
Posts: 4,501
Likes: 90
From: West Warwick RI, postal code: 02893
Car: Building LS3, T56 Z28
Engine: LS3
Transmission: T-56
Axle/Gears: Moser/ 4.11
Re: Roll Bar Install
I installed mine, not to be track legal, but as a way to tie the front to the rear and they don't get in the way AT ALL. Not once. I re-cut the door bars to install lower so you don't have to step over them, then I never put in the loop cross bar, and finally I just installed the bars straight back to about the top of the spring perches.
Honestly not got in the way once. EVER, not even when cleaning to get ready for shows. now I have an out of the way 6 point and SFC, car is stiff as hell.
Great way to go and i would recomend it to anyone making GOOD power.
Honestly not got in the way once. EVER, not even when cleaning to get ready for shows. now I have an out of the way 6 point and SFC, car is stiff as hell.
Great way to go and i would recomend it to anyone making GOOD power.
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From: Charmhaven, Australia
Car: 1999 subaru forester GT (urgh)
Engine: ej20 turbo
Transmission: 5speed
Axle/Gears: 4.11:1 awd
Junior Member
Joined: Nov 2002
Posts: 43
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From: Orangeville.ON
Car: 86 IROC
Engine: 305 lg4
Transmission: 700r4
Re: Roll Bar Install
Joined: Feb 2005
Posts: 4,501
Likes: 90
From: West Warwick RI, postal code: 02893
Car: Building LS3, T56 Z28
Engine: LS3
Transmission: T-56
Axle/Gears: Moser/ 4.11
Re: Roll Bar Install
Holly crap do I ever. Go to my CD site. Here is the link. Take your time and click though the whole thing. You will find whatever angle you want.
http://www.cardomain.com/ride/782913
http://www.cardomain.com/ride/782913
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