S13 10 Point cage regulations

[bonomo]

ok i have a 89 240sx coupe Im about to do a weld in cage and ive searched on how to mount the rear bars and the regulations on being certified but i cant find anything! I need to know if i can weld the bars to the wheel well and it be legal for the track. the point on doing this is that i have rear seats that i dont wanna take out!
http://i27.photobucket.com/albums/c177/bonomoskat/bmo1999.jpg

[T-FAST]

any specific sanctioning body you will be racing under?

[bonomo]

1/4 drag strip and maybe some drifting

[tommytwo40hands]

check out www.brokedickracing.com (http://www.brokedickracing.com) i know they have up to a 14 point cage and can also do custom cages..if anything give them a call and ask them your question.

[T-FAST]

Here is a quote for NHRA roll cages. NHRA requires a roll cage when running faster than a 9.99 or 135mph or greater and must be a 8pt or greater.

The cage must be constructed of mild-steel tubing at least 15/8 inch in diameter, with .120-inch wall thickness. It can also be chrome-moly tubing of .083-inch wall thickness with a total of eight attachment points. These eight points refer to the placement of the cage surrounding the driver, including the two rear support bars. NHRA does not require bars that run forward to the front suspension, although many cage designs include them. All cars running 9.99 or quicker must have the cage certified by NHRA and have the NHRA certification sticker attached to the cage.

Here is a link from formula drift and if you scroll down the page to the section 2 area it goes into detail about correct roll cages.
Formula Drift (http://www.drifting.com/Formula_Drift.php)

All of these requirements pertain to competition use. Hope this helps!

[theboy]

in laments terms, door bars/tie in A & B pillars for D1, and halo, a pillar, back brace, vertical diagnal, and tie in the rear strut towers for everything else, if you build a D1 cage you can run it at a drag strip. If you go faster than 9.99 in the 1/4 mile then you have to have a basic cage D1 is over kill compared to a basic cage. D1 makes you run door bars and A&B pillar gussets cause your door to door every run. Plus on an s13 it makes it a hell of a lot stiffer.

my suggestion if your thinking of keeping the back seat, then your a fool. cause your going to cut it off from holding anything but a battery or backpack once you put in a rear cross bar. And you have to go rite through the seat back to get to the shock towers on a coupe. And if your going to try to make a 10 point, then do your home work and tie in the front shock towers as well. You'll thank me later

[clay9110]

Wait, when you say tying in the front sturt towers. Are you talking about with a strut bar or how else would you go about this?

[bonomo]

Isnt the autopower bolt in cage legal?? Cause that bolts in to the wheel well too.

[tommytwo40hands]

Isnt the autopower bolt in cage legal?? Cause that bolts in to the wheel well too.

yes it is legal, but it's only a 6 point cage not a 10 point cage like you were wanting..but yea it meets SCCA and NASA specs..from the pics i was looking at i looks like it wouldn't hold up to a hard impact. did you check out BD Racing?

[bonomo]

ill probaly try to run it over the seat and down to the floor but if not then im gonna run it to the wheel well.

[fastbackinit]

I can understand 2 reasons for a back seat, oem apearance and a car seat, I feel ya on wantin 2 keep them but once you put in a cage, especially a D1 cage u jus shot chances for both of those. Even if you did go over the seat that's still not gonna give you passenger space. I'm no expert but I do know that a straight bar is going to hold more stress (impact) than a bend. I can't even ride my 4mo old in the 240 because I don't have back seats, but if I had a full cage hed probably be safer up front anyway. In my opinion, drop your backseats unless its a family car, (coupe? Ya right haha, jk). Safety first man, jus mount a single front or racing seat in the midle if you really want a passenger capability.

[fastbackinit]

Wait, when you say tying in the front sturt towers. Are you talking about with a strut bar or how else would you go about this?

And I think he's refering to a drag type cage and running two foward bars through the firewall to the towers or to the subframe.

[Jonnie Fraz]

If you are planning any Pro Am Formula D your cage must comply with their rules. I have found that they seem to be the most particular in their requirements. In formula d no bolt in cage will pass tech. I think once you start designing your cage you will want to remove the back seat.

[theboy]

And I think he's refering to a drag type cage and running two foward bars through the firewall to the towers or to the subframe.

yes, thats exactly what i was saying. basically tie the A-pillar bars to the froint shock towers by running bars through the fire wall and welding them to a plate, then the plate to the shock tower. This i a very smart idea considering that the weakest point on the car is where the front is spot welded to the fire wall. Any place you put a bar on the stock sheet metal, youll hvae to put in a base plate. Other wise if you roll the car you send your nice new cage through the floor, and crush your self.

One cage made to a racing sanctioning body specs might not be legal to run somewhere else. (As in Formula D cages didnt pass Nopi tech and vise versa a couple years back)


Oh and Formula D doesnt allow any type of bolt in cage. That was a new rule put in begining of this year.

[bonomo]

My friend said that the down bars can curve over the seat and weld to the floor