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I am OEM parts sucker. Get OEM rollcage and keep your car away from ricing it.
Too bad the OEM cage requires welding / drilling for the OEM receiving plates on the frame for the front section, as well as new cosmetic interior trim panels that are recessed to clear the rear bar legs ($$).
There is an issue of the steel that is available: most use chromoly steel-strong and light but potentially brittle-especially at the weld zones and post weld stress relief is needed-that is why there are not used in race cages-you can’t really heat treat the whole car. The alternative material DOM is supposedly more resilient and less prone to stress failure.
So if we eliminate the Cromoly steel cages we are left with Cantrell, CMS and Alexshop. I may have missed others but this is what I found.
Of these three I eliminated the Cantrell and the CMS Bar because they are multipiece .That leaves the Alex bar which is one piece welded from DOM and has the horizontal attachment closer to the seats keeping the belt length as short as possible.
Ok, thanks for reading to the end-anyone feel free to dispute or chin in. Also if you have an Alex bar let me know how you like it and post a pic of the view through the rear view mirror-thanks!
I'll chime in quickly. The interlocking joints used in CMS roll bars are 1018 Cold Rolled Steel; given that they're solid, they are stronger than the roll bar tubes themselves. Our clamp hardware is Metric Grade 12.9 (177,000 psi tensile strength). 4130 is about 30% stronger than 1020 DOM (what Alekshop uses) and Docol is 10-15% stronger than 4130. CMS uses 1.75" x .120" tubing vs. 1.75" x .095" tubing; strength-wise, the roll bars are in totally different categories. That's a little geeking out on specs, granted, but you seem justifiably concerned with structural safety (a roll bar is, after all, a safety device) as well as harness placement, etc.
You're right that DOM is more "forgiving" and suffers less weld-embrittlement than 4130, which is why a lot of chassis builders will use DOM in the roll cage of an otherwise-4130 chassis. We did the same in building full racing chassis until switching to Docol gave us the best of both worlds. Not trying to sway your decision, just giving you some info to consider. (When you add up materials, custom powder coating, and free shipping, I will admit we're trying to make it hard to choose another product!)
Too bad the OEM cage requires welding / drilling for the OEM receiving plates on the frame for the front section, as well as new cosmetic interior trim panels that are recessed to clear the rear bar legs ($$).
And I believe you can't buy them from Porsche (or Porsche Motorsport) anyway. Only if you own a CUP car ?
anyone in the Bay Area have the Schroth Porsche-specific carbon bucket 4pt belts with a bar that I can inspect- happy to meet most anywhere and buy you lunch for your troubles - if possible I'm going to be at thunderhill this weekend w/PCA Diablo and GGR - so if you're there come find me.
I'm thinking the following setup for my '18 GT3
GMG LMS Bar
6 points Hans compatible for driver seat
4 point Schroth for passenger seat - passenger seat gets used so rarely seems a reasonable compromise
any comments or concerns?
will the 4 point Schroth work with HANS - should I happen to have an instructor in the seat w/HANS?
I’ve gone through your same logic sequence myself and come to the conclusion that I think I just want harness mounting, not a pseudo roll bar. Since nobody offers such a thing for the 991, I plan to get one custom fabricated that attaches to the same rear shelf mounting points as most of the pseudo roll bars.
My goal (which appears achievable) is minor slot cutting to the opener rear generic 991 carpet over the engine area for belt pass through, and zero mods to the seat shelf carpet with the GT3 stitching.
If I break down and get a pseudo roll bar out of laziness, I like the custom layout BBi bars the best (love the curved main hoop, that is slick).
I would be in for one as well, if it helps to make two?
Any vendors want to pick up this business? Making us a simple harness bar using the rear pick up points? Here are a couple visual examples from the 997 car:
Our partners at IND Distribution in Lake Zurich Illinois were able to get our WEC bar into the hands of a lucky 2RS owner this week. Doesn't it just look right at home?!
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02-28-2018, 11:23 AM
