roll cage vs sfc

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thumpida

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with a well designed roll bar would sfc have much to offer. surely a roll bar properly designed would far surpass the effectiveness of sfc. im not looking for a 12 point cage, i dont want anything that intrusive. though what i had in mind is a hoop at th bpillar with a removable crossbrace to allow the seats to recline for the highway(as im 6'2").i saw the rickety hoop with rear supports that go underneath the seat though i would think the fact that they bolt on instead of welded must hurt their effectivness.now back to that nonintrusive rollbar(rriiiiiiiigggghhhht). what i had in mind was running bars along the ceileing and down the c pillar through the rear deck and an attachmant plate on the rear struts with a crosspeice welded on like a strut tower brace. weld it to the strut tower and leave holes for the bolts. any thoughts on if this is feasabile? how much more of a difference would 2 front bars to the a pillar make. i want to keep the front seats looking clean and uncluttered.the roll bar would also provide a nice place to mount some 4 point harnesses to. do you think this could be done without extreme work?im not looking at this as a rollcage protective standpoint, simply a chassis standpoint.it would seem like this would lockthe back half of the car together pretty well. if this was the case would shorter sfc's be of use to tighten up the front end extending bakc to th b pillar rollbar attachment point? that way access to bushings and fuel filter isnt restricted?
 

Hack

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The design you describe does not tie into the front subframe. For this reason I would think you would still see more rigidity with a combination of both. If you added removable or swing away bars going down next to the front seat, or ran bars down the a-pillar to the front strut towers, that would probably render the subframe connectors as useless. Of course the more complex the cage, the stiffer the car will be provided it is done properly.
 

silversho89

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how about if you ran the full sfc's and instead of running a post down the a-pillar you just ran one at an angle from halfway up the hoop down to the floor by the drivers foot? This way it would save you the trouble of hacking up your dash and it would be easier to get in and out b/c you dont have a bar along the roofline to hit your head on since your relatively tall. Sorry if my description was a little hard to understand but hey, it made since to me! :lol:
 

Shoaz

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Without some sort of connection from the main hoop to the front part of the chassis (e.g., via the A pillar) I don't think you'll be increasing the stiffness that much from what you've described. What you've described will help, but not as much as a well-designed full cage.

How stiff do you want this thing? Cages add weight, so there's a tradeoff between any gained stiffness and the weight required to get there.
 

theoriginalscion

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I was working on a bolt in roll bar , and thinking about doing a small run. I threw main hoop together yesterday and took a couple pics, I can email them if anyone wants. My design is very strong compared to the Rickity cage. Not that I'm saying anything bad about it, Good bends and fitups, just The name says it all. I couldn't drive a car with the Rickity bar,its too far foward in passenger compartment. My head would :bonk: it without a helmet on.
I'm 6'4 and don't fit into many cars easy,so main concern was fitting main hoop with diagonal cross brace and harness mount bars so they don't have to be removable. I did it :rofl: You can have seats almost all the way back before there on roll bar. The biggest problem is building a Roll bar that fits everyone, I always design around driver and permenant seat position.All though I'm an advocate of fully welded bars, I will make this one a bolt in for ease(IS it really) :huh: The mounting plates for main hoop will bridge together the weld line were rear and middle sections of car are joined. So with SFC'S the roll bar will really work good together.
I also can do hoop braces to rear in a couple differnt ways, Id like to go right to the rear suspennsion or brace bar across strut towers, But it wont work in the car with an interioir and not a 2generation cause rear deck differences. I can make these bars removable for more room.I'll have to go under seat like the Rickity. I'd like to mount wider then seatbelt mounting points and just keep one rear seating position+belt. Or I can mount were seatbelts go and have two outside seating posistions(a little cramped) butalso keep seatbelts. Also you dont have to can front seatbelts.
I'm thinking about price, whats sounds good?It will be ready to bolt in,I can paint with primer + I can always add some extra bars. I got some extra tubing lying around so I'm going too throw a couple together and install in my cars.
 

theoriginalscion

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Roll Bar is all done. Serious parties please ask me to send some pics. I havn't figured out Cardomain thing yet. Bar is nice and fact that its TIG welded, Ooo so sweat. :****: I almost want to keep for myself, but all my other cars but the SHO'S have full Roll Cages, and I like to keep it that way. A daily driver with a roll cage sucks.
Just have to figure out what to name bar.
 

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