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Old 03-26-2014, 02:22 PM   #1
06rexwagon
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Default 10.00 legal roll bar, WRX wagon

This is my first bar ever, so I'm sure it could be better, but for the time and $ spent I'm happy. It's good enough for 10.00 and <135, so won't get me an 8.50 cert, but makes me feel a little safer.

I didn't want one of the autopower bolt in kits because it takes the back seat access away. I came up with this:




Bendtech pro is badass.
Borrowed a JD2 model 3 bender, bought some 1.75" DOM .120" wall tubing and went to town.























Now I can still have passengers in the back. I'm still not legal for the ET or mph that I run, but the car only sees the track 2-3 times a year and they didn't even warn me for going [email protected] with no bar.
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Old 03-26-2014, 03:13 PM   #2
PARANOID56
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you cant put passengers in the back. unless they want a full face of rollcage during a crash.

i would have also put those rear bars much higher and into the corners of the roof more.

oh and yea, i love bendtech
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Old 03-26-2014, 04:44 PM   #3
Paul
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I like how as a driver you dont have to worry about hitting your head on a bar
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Old 03-26-2014, 07:34 PM   #4
06rexwagon
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Quote:
Originally Posted by PARANOID56 View Post
you cant put passengers in the back. unless they want a full face of rollcage during a crash.

i would have also put those rear bars much higher and into the corners of the roof more.

oh and yea, i love bendtech
Not sure how I could have put the bars further up. They at at the top of the arc of the bend, on a 6.5" die. The straight sections of the bars are really close to the headliner and B pillar. I'd like to have them further up too, but if I went towards the center of the car they would be right above a passengers head.
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Old 03-27-2014, 12:26 AM   #5
norexyet
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Looks alright. I would have that main hoop diagonal way over towards the drivers side though. Looks really out of place there. The back bars don't look terribly low. Could have put a bend a few inches in to kick them up higher but for your first time it's not bad. Will get the job done for sure.
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Old 03-27-2014, 12:44 AM   #6
06rexwagon
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Quote:
Originally Posted by norexyet View Post
Looks alright. I would have that main hoop diagonal way over towards the drivers side though. Looks really out of place there. The back bars don't look terribly low. Could have put a bend a few inches in to kick them up higher but for your first time it's not bad. Will get the job done for sure.
The diagonal bar was an afterthought, and was modeled after the autopower bar. Thanks for all the feedback guys.
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Old 03-27-2014, 08:46 PM   #7
wantsti
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please dont have people ride in the back seat.
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Old 03-27-2014, 11:29 PM   #8
Bikelok
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PSM

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+2 for keeping people out of the back seat. Unless you want them dead.

You should just delete the back seat and you could have more room to do what you want.

Super dangerous for any passenger in the back of that thing.

Nice job though.
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Old 03-28-2014, 04:17 AM   #9
Surb00
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Wow that's a really quick wagon! I'm not trying to be the bad guy here but I'd hate to see someone emulate this design. The main hoop bends shouldn't ever total more than 190 degrees. The rear braces shouldn't have bend in them. I know NHRA may pass them but no other sanctioning body will and there is good reason for that. The mounting plates for the main hoop and rear braces should tie in on two planes and to a structural point of the unibody whenever possible. It is very easy to do so on a Subaru. Where you have them mounted the main hoop will likely punch through the floor before adding much resistance to deformation of the roof structure. The main hoop diagonal should tie into the main hoop as close to the same point as the rear brace. It looks neat but don't kid yourself that the car is anything but heavier than before or that it is acceptable to carry any rear passenger who is not fully aware of the risk.
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Old 03-28-2014, 12:40 PM   #10
06rexwagon
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Quote:
Originally Posted by Surb00 View Post
Wow that's a really quick wagon! I'm not trying to be the bad guy here but I'd hate to see someone emulate this design. The main hoop bends shouldn't ever total more than 190 degrees. The rear braces shouldn't have bend in them. I know NHRA may pass them but no other sanctioning body will and there is good reason for that. The mounting plates for the main hoop and rear braces should tie in on two planes and to a structural point of the unibody whenever possible. It is very easy to do so on a Subaru. Where you have them mounted the main hoop will likely punch through the floor before adding much resistance to deformation of the roof structure. The main hoop diagonal should tie into the main hoop as close to the same point as the rear brace. It looks neat but don't kid yourself that the car is anything but heavier than before or that it is acceptable to carry any rear passenger who is not fully aware of the risk.
Thanks for the thought out reply. As I said, I've never tried to build anything like this before, and my goal was to satisfy NHRA requirements while keeping the car streetable. It's a low mileage 2006 limited with all the comforts of a new car (DVD, AC, heated seats, etc.) I think you're saying the plates should be pushed back further by the rear seats for the main hoop, which would give me a stronger place to put it. I agree, I just didn't want to lose all of my room. For the rear bars, NHRA says you can bend that tube all you want, and it can be any length you want, as long as it is 1 5/8". I ran 1 3/4" . The rear plates actually bend around the spare tire well, so they are technically on 2 planes like you suggested. I really do appreciate all of the input from those of you that know more about this than I do. I've built this car from stock, to a 9 second car at 5400' elevation and have learned a lot along the way. I've also made a lot of mistakes along the way.
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Old 03-28-2014, 09:58 PM   #11
norexyet
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Absolutely nothing wrong with putting a bend or bends in the back bars or door bars not sure where he came up with that. If you made that out of 1 5/8" it wouldn't pass. Roll bars need to be 1 3/4. Cages are 1 5/8.
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Old 03-29-2014, 01:11 AM   #12
Surb00
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Norexyet- I am aware NHRA is OK with it as I stated. However most other sanctioning bodies are not.

FIA article 253 on backstays (rear braces): "They must form an angle of at least 30° with the vertical, must run rearwards and be straight and as close as possible to the interior side panels of the bodyshell."

From the 2014 NASA rule book; "15.6.11 Rear Braces The main hoop should have two (2) braces extending to the rear. The braces shall be attached as near as possible to the top of the main hoop, and no more than six (6) inches below the top. The braces should not contain any bends*. There must be at least 30 degrees between the plane of the main hoop and the plane of
the rear braces. The main hoop rear braces may consist of an “X” pattern design. The main hoop braces may be mounted at the rear shock mounts or suspension pickup points (providing that the braces remain in compliance with all other sections of the CCR). They may go through any rear bulkhead(s) provided the bulkhead(s) is sealed around the cage braces. *There may be certain exceptions allowed for cars that cannot possible meet this “no bend” requirement. One exception is listed [Ref15.6.11.A)]. Other exceptions may be made if all of the required bars meet the specifications for a vehicle in the next heavier weight classification and the alternative design is submitted to the NASA National Office for special allowance."

NASA's exceptions include the Porsche 914, Pontiac Fiero, Honda Del Sol etc. The WRX does not fall into this catagory.

Rally America uses FIA regulations as well.

Common sense will also tell you that a straight tube is stronger than a bent tube when a force is applied to the ends in compression or tension.

Bottom line is don't make comments on things you know little about. That is the greatest problem of forums. Someone will come in and read your post and assume you know what you are talking about.

And again, let me restate my position that I'm just trying to minimize misinformation regarding what many consider to be a rather important safety item.
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Old 03-29-2014, 01:24 AM   #13
Surb00
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06rexwagon - I can definitely appreciate your trial and error approach, I think most of us learn that way. Some of my first "builds" were full of terrible ideas that I came up with entirely myself or read about on forums. For me, the things I learn along the way are what makes building cars fun and keeps it interesting.
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Old 03-29-2014, 02:35 AM   #14
norexyet
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I've done and continue to do cages and loads of other chassis fabrication on everything from 6 second drag cars to fully prepared road race porsches and a few subaru cages for members on here. I know a thing or two. I know different bodies have different ways of doing things. Some of those things I agree with some not. For his car for nhra it'll be fine. I'm just giving my opinion because I have a lot of experience with chassis work and I like to see people do things right especially on a car as nice as his wagon is.


Last edited by norexyet; 03-29-2014 at 03:07 AM.
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Old 06-16-2014, 04:52 PM   #15
David Medina
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a quick tutorial on the basics of how to use the program and fitting the cage would be amazing. im a welder, but i know nothing of these programs. They really amaze me.


nice work.
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