8.50 roll cage HELP

[crazyfast]

Trying to find out what i have to do to make a 8 point roll cage in a 92 fox body to cert. up to 8.50 8 point is on 6x6 plates i know it needs to be a 10 point but don't know if it has to connect to subframe, some say yes some say no :confused:

[GRIFFIN]

2 bars off of main hoop below back brace bar, have to connect to your subframe connectors.
You will have to post pics to get much help.

[MattG]

For an 8.50 cert. cage, are rear crossbars required?

Also, are gussets required if the weld cannot go all the way around the bar because of the roof, etc?

[crazyfast]

2 bars off of main hoop below back brace bar, have to connect to your subframe connectors.
You will have to post pics to get much help.do i have to cut a whole in the floor then connect it to the subframe connectors?:)

[GRIFFIN]

do i have to cut a whole in the floor then connect it to the subframe connectors?:)


Yes, bars must weld to the subframe connectors.

[GRIFFIN]

For an 8.50 cert. cage, are rear crossbars required?

Also, are gussets required if the weld cannot go all the way around the bar because of the roof, etc?


By rear crossbars, do you mean a rear X-brace? If so then no an X-brace is not required, you just need rear down bars.

If by rear crossbar, you mean the bar on the main hoop that goes behind the seat? Then yes that bar is required.

Gussets are required if you can not weld all the way around the bar at the roof. Gussets are allowed to make up for 30% of the weld so you still have to get at least 70% of the way around.

[crazyfast]

Yes, bars must weld to the subframe connectors.do the subframes have to be a certain size, i do have welded in connectors just wanted to make certain on size. What about the gussets can the ones from like jegs be used, sorry about all the questions trying to save money and do alot myself.:)

[GRIFFIN]

Minimum size on the subframe connectors is either 2" x 2" square or 1 5/8" round. The gussets from Jegs will be fine, I usually use 3/4" round tubing 4 inches long. But, either is acceptable.
You don't need to apologize for asking questions, shoot I ask a ton of them on here. We got to share the knowledge that we have, we all have the same goal. Go fast!!!!

[MattG]

Griffin, would you use the same 3/4 round tubing 4" long for a gusset on the roof bars?

[crazyfast]

Minimum size on the subframe connectors is either 2" x 2" square or 1 5/8" round. The gussets from Jegs will be fine, I usually use 3/4" round tubing 4 inches long. But, either is acceptable.
You don't need to apologize for asking questions, shoot I ask a ton of them on here. We got to share the knowledge that we have, we all have the same goal. Go fast!!!!:D I whould reather use the 3/4 round tubing is there a certain thickness an is 4" the longest or shortest they can be. My subframe connectors came from jegs they are Granatelli but i don't think there 2x2 maybe 1 1/2 x2 where can i get the right ones if they are not right:confused: and thanx for all the info:p

[GRIFFIN]

Griffin, would you use the same 3/4 round tubing 4" long for a gusset on the roof bars?

yes, and that is 4" long minimum on the long side of the tube after you cut it at the angle and notch it.

[GRIFFIN]

:D I whould reather use the 3/4 round tubing is there a certain thickness an is 4" the longest or shortest they can be. My subframe connectors came from jegs they are Granatelli but i don't think there 2x2 maybe 1 1/2 x2 where can i get the right ones if they are not right:confused: and thanx for all the info:p

I usually make them right at that 4" mark on the long side of it, they call for 4" miniumum. I am having a brain fart, I believe it is .049 thickness on moly for steel you will probably want to be at least .065. Like I said I am having a brain fart and am not 100% sure on that right now, I'll have to look again tommorrow, but I think that is right.
As far as connectors if the Granatelli's wont work, I always make my own, but try Racecraft.com, they are up by Chicago and make nice stuff.
I guess you buy alot from Jegs and that's fine, hard to beat there prices. But for real race car parts, I prefer things that they don't sell, check Racecraft, you'll be happy wtih there stuff.

[crazyfast]

I usually make them right at that 4" mark on the long side of it, they call for 4" miniumum. I am having a brain fart, I believe it is .049 thickness on moly for steel you will probably want to be at least .065. Like I said I am having a brain fart and am not 100% sure on that right now, I'll have to look again tommorrow, but I think that is right.
As far as connectors if the Granatelli's wont work, I always make my own, but try Racecraft.com, they are up by Chicago and make nice stuff.
I guess you buy alot from Jegs and that's fine, hard to beat there prices. But for real race car parts, I prefer things that they don't sell, check Racecraft, you'll be happy wtih there stuff.thanx i will try them

[Silverback]

2 bars off of main hoop below back brace bar, have to connect to your subframe connectors.
You will have to post pics to get much help.

Huh…. I was under the impression that they had to be tied to a suspension pickup point or to the frame, in other words, you could weld the typical 1/8” thick reinforcement plate to the top of the floor where the torque boxes are on a mustang (and if you’re going to do it right the torque boxes should be firmly welded to the bottom side), and then tie those 2 bars to that spot.

Other wise I was under the impression that properly tying them to the subframe connectors was just an extension of that, that you were tying things into the suspension pickup point by virtue that the subframe connectors tie into them.

Another thing that I’ve seen that passed but I don’t know why was on a 3rd or 4th gen f-body, I’ve seen someone add reinforcement plates to the tranny tunnel and tying those bars to that area. The only thing that I can think of is if the argument was made that this tied together the boxed section reinforcing the seat mounts as part of the frame, or possibly if they had a tranny tunnel mounted torque arm (like the GW or Jegs ones), then it would be tying in a suspension pickup point, but again, I don’t know why/how they got away with it.