I am not sure which "NASA officials" reviewed this and I'm not trying to instigate an argument, I just want to help make thing better... so I shared the pictures of your design with our NASA director who also builds a lot, A LOT, of cages and your design is in no way, shape, or form in compliance with the harness bar / diagonal bar intersection rules. In fact, your design is similar to the non-legal roll bar designs and not the legal SCCA and NASA roll cage designs. "Must intersect" is mentioned in the CCR twice for good reason and that is not a wording that is up for interpretation.

If a car with this cage comes to Utah, it will not pass tech. My advice is that this needs to be fixed before your design is finalized vs. rolling the dice with which "official" happens to look at it.

Your concerns are justified, and are why we're leaning on the officials we talked to about getting some more rigid documentation for our car. They recommended printing off the emails and keeping them in the logbook, but I want something more official. If you'd like, I can PM you the names of the officials we talked to about our car. If it makes a difference, more officials than just our region approved our design.

But I do agree with you that it means more hassle getting cars through tech, and we will most likely not be doing this design in any production cages. It'll be good enough for this prototype cage, but we certainly don't want to create problems for customers down the road. We can definitely do it differently to meet the letter of the rules, even if we feel our design is suitably safe/strong. No sense borrowing trouble.

Jake

too bad because when you slide the seats all the way back like I did, the G-speed design is perfect to give maximum clearance behind the seats. Looking forward to a potential new design, two U shaped tubes may be the easiest way to go.

It'll most likely be a single U and a straight bar on the passenger side. With the diagonal on the passenger side, you can't move the seat as far back anyways.

Alright, we're ready to pursue this. We need a car to use for the R&D, though. Ours no longer has an interior (and there's a welded cage in the way), so we need to borrow a car from someone.

We need a BRZ or FR-S with a full interior for at least a month. We'll be pulling seats, interior panels, etc. to take measurements, maybe 3D scans, etc.

In return for helping us bring a new product to market, this customer will get a free bolt-in harness bar, free installation, etc.

If interested, contact us through PM here, or email sales@gspeed.com

I'd love to participate but I had one welded in last year. Somebody will be getting great deal. :cheers:

If Texas wasn't so far away! I would be down.

If only I still had a 2nd car to drive, I'd bring mine down this weekend for you guys!

Well damn. Installed a harness bar last month. I'll be there June 25 for the Apex event. I'll come by at some point. Maybe we can figure something out.

PMd you today, Tuesday 6/20.

Sent you an email to the address you supplied. Let me know through here if you didn't get it, or call 877-512-5180 and ask for Jake.

Interested in this.

I've been looking to possibly buy a cage ready to just be welded in rather than dropping it off to someoen to have one done.

Would this 4 point kit be available as a weld in option? Seems it would just require different plates to be welded in? Do you have any idea on where the cage will attach?

-Maybe
-In theory, there's no reason you couldn't just weld in the standard bolt plates, though. Just put some rosettes in the bolt holes.
-Not 100% sure yet.

It's going to be tough to bolt this thing in the car. That's probably a big part of why no one else has released one yet. There aren't many good spots to bolt to on this chassis, so it may be a little unorthodox.

Exactly, it all comes down to how/where a good location can be found to do the mounting.

I have thought many times about some kind of a 4 point system to safely use a hans/5-point. Trying to find an option that fits properly, add safety, and hopefully allows the use of most of the interior. Asking soooo much :(

subbing to find out about the 4 point bolt ins. Just a quick note that you can take or leave how you wish... a lot of us want to retain use of the back seats (what little use it is) . so an option that could keep this would be desirable (at least to me).

If you mean having a 4 point roll-bar with functional rear seats for passengers, you will be disappointed. There is no safe way to build a roll bar and have passengers in the back.

theres no way to have passengers in the back anyway really... lol. but and open space for a carseat would be ok... and I'm not talking about something that will survive a flip at 150mph... just something that will aid safety in a slow to medium speed rollover like most of us weekend racers may like. There are other options out there that retain this already.

I'll follow with interest for a 4 point cage with harness bar.
If possible that retain space for 4 wheels transportation inside the car (no rear seat, plastic, carpet whatever).

Like others have said, it's just not realistic to maintain a usable rear seat. We'll try to keep it for aesthetic purposes, but it certainly won't be usable. There's no way to put a steel tube in a passenger's face AND keep them safe.

We'll most likely be looking into some rear seat deletes as well.

Exactly what I was trying to say. As for storage - if you can put it between the bars, good to go. People, not so much. lol

That would probably be best to prevent confusion on the part of the users. If there's no rear seat, then there's no question about whether the rear seat is usable or not. Otherwise people will try to squeeze in and potentially injure themselves.

If you build this, please make it somewhat structural so we can throw track day supplies on top of it (such as tools, spare tire, etc.)

We've got a stock interior car identified, and we're moving forward with design of a 4-point bar. I'll create a new thread for discussion specifically for the 4-point rollbar.

Jake

Was just about to email you to tell you I can't stay away any longer (as you predicted would happen), have picked up a second car so I can be without the FR-S for a while if you want to put a 4 point in. Let me know if your current car falls through.

Awesome! Glad to hear you're still in the game. :D

We'll definitely keep you posted as we move along. Feel free to stop by and check things out!

Jake

Thread for the roll bar is now active:

http://www.ft86club.com/forums/showthread.php?t=108377

http://gspeed.com/wp-content/uploads...7ia0b52pyg.jpg