Originally Posted by 911SLOW

Mikymu all I can say in thE forum is that carbon cages won’t pass any of the tests for cages, and to give you an example that is based on actual events let’s say you roll over with the carbon cage and on the first impact the roof doesn’t collapse. If the car stops rolling you are ok if it continuous to roll you are not because the cage won’t be there no more. It has been destroyed to little pieces in the first impact doing its job once and now you are rolling without one.

And for the bolted vs. welded here is a picture from 997rs with rohlr driving.
If dmbs AND FIA accept the OEM Porsche cage with bolts i don't see why we shouldn't.
Also two abstracts from adac 24h regulations that are self explanatory.

John

Originally Posted by cfjan

I think the OEM cage is meant to be fitted w/o gutting the interior. Maybe if the cross bar is added, you'd have to start trimming the interior pieces.

Originally Posted by DRG13

mikymu,

Ask FRIZ here on rennlist if the OEM roll bar works...he has some first hand experience...best described as full, full, nose-to-tail full, then a round-off....and then nailed the landing...video is still out there somewhere on youtube...scary ****

What'd you get FRIZ, cut nose, sore ribs, sore shoulders?? without OEM rollbar, belts, seats and helmet it would have been UGLY...

Originally Posted by mikymu

Thanks for the info John. Very useful. CF roll cage is not a viable solution. Now I need to figure out how to incorporate a knee bar on OEM roll cage - it will have to be bolt on and not intrude the driver space. It's going to be challenging for sure to come up with a solution

Originally Posted by 911SLOW

Glad I talked you out of the Carbon Cage.
About knee bar I would say you are going too far with it the a pillar sides of 997 are far stronger than the 964s but me likes going too far so you can buy a fia approved bar and attachment points and build one removable all you need is a good welder.
I am planning to do a DIY of some kind (you are far better in DIY posts and you have purple gloves too) for installing side door bars on the oem cage of 996.
Good luck with the built.

John

Originally Posted by cfjan

Yeah, below the steering column, but might have to cut into center console.. ?!

Originally Posted by Asquared

My dealer told me the OEM cage wall thickness wasn't thick enough to use for racing. Any truth in that?

Originally Posted by tcsracing1

the carbon cage concept is great, however the anti-splinter technology is not yet approved in north america or FIA i believe......

nobody wants to pick shards of carbon from the back of their head.......


The knee bar is another SCCA etc rule...... funny that CUP cars dont have em'.......

i was told that the 997 tub has enough support without knee bar.......

Originally Posted by sharkster

Tony from TCDesign should step in here

Originally Posted by tcsracing1

Europe and USA are where this comes into play.
Europe FIA standard are what the OEM bolt-in cage is based on.

However in USA, groups such as SCCA decided on a material that happens to be thicker than what FIA requires.

Thus north americans assume the OEM cage is not as good as larger tubed cages.

it is a misconception.

Originally Posted by mikymu

Thanks for the clarification. So Cup car don't have knee bar? Looks like they have a mini extension at the bottom of the A-pillar bar






Love their roll cage and he did a great job on mooty's 6 Gt3

Originally Posted by DRG13

Originally Posted by tcsracing1

Europe and USA are where this comes into play.
Europe FIA standard are what the OEM bolt-in cage is based on.

However in USA, groups such as SCCA decided on a material that happens to be thicker than what FIA requires.

Thus north americans assume the OEM cage is not as good as larger tubed cages.

it is a misconception.

Originally Posted by 911SLOW

This misconception is no longer valid.
FIA approved cages are welcome in SCCA.

John

Originally Posted by Asquared

Thanks guys. I appreciate the insight.

Now, a related question. Several others have observed that the OEM bar limits the seat travel, so that if you are tall, the bar interferes with your driving position (recognizing that on the track, you probably want to move your seat closer to the steering wheel to allow more control and better heel/toe, but I want to preserve the streetability of the car regardless).

I plan on putting a roll bar and seats in the car this winter, so I starting the research now.

Thanks.