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davidfarmer

Cage DOOR-BAR design, FIA vs US

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trackboss

David, do you know what the specs are on the new driver's side bars for WC? For example, do they all have to be 1.75x.095 or can the straight tubes be be lighter or vice/versa? How many straight tubes required and must they be an x? Also, do the "nascar" portion of the bars have to attach the main hoop and a-pillar tubing or can they attach to the straight tubing?

 

thanks,

-V

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racercosmo

I don't have the specifics V, but all mandatory tubes must be the same diameter and wall thickness tubing.

On the STaSIS cars, which were built by Audi Sport, they look like somebody originally had X bars, then decided later to add "NASCAR" bars. my memory's a little foggy, but I believe both sets of tubes attach to the main and front hoops.

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davidfarmer

you can download the rules from SCCA, but I'm pretty sure the bars have to all be the same (usually 1.75 x .095), and I KNOW that they all must attach to the fron and rear main hoops. So basically, your going to have around 5 separate tubes in each door to be 100% legal in World Challenge

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DriverGT5

I was talking to Jim Pantas this weekend and he brought up a good point. He runs NASCAR bars for one simple reason, his elbows hit the "X" brace. If you are seriously worried about deforming the bars due to reduced tensil strength, run a 4 bar setup. If you crush a 4 bar design, you have a lot more to worry about and the simple X brace probably wouldn't fare any better IMO.

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mcmmotorsports

Coming from a NASCAR background, I can say this...I have been t-boned before in a NASCAR Stock Car and I am glad it had 4 doors bars instead of an "X". One thing that has not been mentioned above (unless I missed it) is that NASCAR racing, whether local or Nextel Cup, is technically a contact sport. Contact is expected and most of the time allowed in Nascar racing. If there was as much contact in the twisty racin', then yes, door bars similar to the Nascar design would probably be required. I just don't think FIA, NASA SCCA and others think that t-boning is common. When I build my car, I will have NASCAR style door bars. For one, I am used to getting in and out of a car with those style bars and two, I just feel that it is safer. No, I don't think I will ever be t-boned, but if I did, I would much rather have 3 or 4 door bars than just the NASA required 2.

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Gfaules

Davidfarmer,

 

Just curious, I have a good friend from back east that was involved many years racing both Nascar and other venues, by any chance are you related to "The" Farmers gang from the south or do you know Curtis or Red?

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clotuning

Bringing this thread back up from 10 years ago. Anybody else have thoughts they would like to bring to this discussion?

 

I'm thinking about putting a roll cage in my 240sx but I'm stuck on choice of door bar. I do like Nascar door because of the room and ease of jumping out of the vehicle in an emergency but in my car they would have an s-bend. I would like to choose which is more safer on a side impact.

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FBody383
I'm thinking about putting a roll cage in my 240sx but I'm stuck on choice of door bar. I do like Nascar door because of the room and ease of jumping out of the vehicle in an emergency but in my car they would have an s-bend. I would like to choose which is more safer on a side impact.

 

No S bends. One alternative is to leave the factory door impact beam in place and the pyramid style X-bar where as far into the door as you can. I'm assuming your gutting the doors if you're putting a cage in.

 

Read the "Cage Design" thread at Corner Carvers.

 

http://www.corner-carvers.com

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Thunder84

I can't see the pics though. 

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