Roll Bar attached to humps structure, strength? - Pontiac Solstice Forum
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post #1 of 6 (permalink) Old 03-17-2017, 11:05 AM Thread Starter
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Roll Bar attached to humps structure, strength?

From Tony's roll bar build post here: Roll Bar Fun - Project Performance Auto Werks

It looks like they didn't use any Rear Bracing, is this because they were able to tie the Roll Bar to the structure behind the seats?

It appears that above the green line is where the roll bar becomes unsupported, seems like doing this would eliminate any need for rear bracing and maybe even the front bracing.


I am not saying I am going to do this, I am just speculating at this point.

If the Roll Bar itself is tied to the structure behind the seats, let's say 100% boxed into the vertical body structure (the vertical body behind the seats) and as usual tied to the floor, would this not be a pretty solid Roll Bar without forward or rearward bracing?

The concept would be similar to the deployable bars on exotic convertibles, like this Porsche:

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post #2 of 6 (permalink) Old 03-17-2017, 11:27 AM
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At one time, and in limited cases, SCCA has allowed roll bars to be braced at the height of the stock shoulder belt attachment point.
I think it was for Solo only, and I am fairly certain that some other specifications were included.
If my memory is accurate the two cars specifically listed were Porsche 914 and Toyota MR2.

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post #3 of 6 (permalink) Old 03-17-2017, 12:23 PM Thread Starter
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Quote:
Originally Posted by JohnWR View Post
At one time, and in limited cases, SCCA has allowed roll bars to be braced at the height of the stock shoulder belt attachment point.
I think it was for Solo only, and I am fairly certain that some other specifications were included.
If my memory is accurate the two cars specifically listed were Porsche 914 and Toyota MR2.
Thanks for the lead, I started googling MR2 roll bars:

A Roll Bar detail ties into something right at the shoulder belt: Techno Pro Spirit Rollbar

A low angle "rear brace": FS: Silver 01 MR-S - $7000

Similar: http://www.cardomain.com/ride/2231815/2001-toyota-mr2/

Another style with a very low angle rear brace: New Roll Bar Supplier NOW WITH PICTURES - Page 23

Seems like we could create the same geometry with the Solstice body, but instead of a baby short low angle rear brace, it would be attached directly to the wall behind the seats.

I would say the application I have in mind would be for the street, but I see rules as the minimum best practice. In the 2017 Solo rules, Appendix C section D it says:

All roll bars must be braced in a manner to prevent movement in a foreand-aft
direction with the brace attached within the top one-third of the
roll hoop, and at an angle of at least thirty degrees (30) from vertical. It is
strongly recommended that two such braces be used, parallel to the sides
of the car, and placed at the outer extremities of the ro

I interpret this as, the Solstice humps are within the Top 1/3 and a brace directly to the rear wall is effectively 90 from vertical, exceeding 30 from vertical requirement

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post #4 of 6 (permalink) Old 03-17-2017, 08:46 PM
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Looks like any attachment that exists is below the horizontal bar, well below the green line.

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post #5 of 6 (permalink) Old 03-17-2017, 09:20 PM
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That is not a picture of the finished roll bar

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post #6 of 6 (permalink) Old 03-18-2017, 04:16 AM
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Roll Bar Construction

Tight and not much real estate to work with has been the discussion with the shop that fabricated the SCCA Solo Compliant bar. Several tracks reviewed and approved it for HPDE events and SCCA Track Night will now allow the car at their events.
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