January 17, 2019, 03:55:44 PM

Author Topic: FD 4-point roll bar  (Read 36166 times)

Offline justinsamberg

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FD 4-point roll bar
« on: September 20, 2012, 04:22:55 PM »
Where working on this simple street roll bar for you guys. Its going to use 1 3/4" .083 wall chromoly tubing with a strut tower brace/harness bar. It will also have a V-type bolt in brace to help triangulate the hoop since were going to leave it open.







« Last Edit: January 20, 2015, 01:29:55 AM by justinsamberg »
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Offline Sabre002

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Re: FD 4-point roll bar
« Reply #1 on: September 20, 2012, 04:37:23 PM »
how does it fit to the floor I"m looking for something that goes through the bins to the cross floor brace.
Josh
Stig's sunglass wearing American cousin
74 MGB GT V8 12.83 (75 shot)
93 402 LS2/T56 Rule 3 No V8 RX7's


Offline justinsamberg

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Re: FD 4-point roll bar
« Reply #2 on: September 20, 2012, 04:46:56 PM »
It ataches to the floor pans. Im going to start on a 6-point NHRA legal bar here pretty soon. This just the inexpensive street version.
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Offline Sabre002

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Re: FD 4-point roll bar
« Reply #3 on: September 20, 2012, 07:06:47 PM »
I'm looking for a SCCA 4 point.
Josh
Stig's sunglass wearing American cousin
74 MGB GT V8 12.83 (75 shot)
93 402 LS2/T56 Rule 3 No V8 RX7's


Offline 7StarrsSin

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Re: FD 4-point roll bar
« Reply #4 on: September 20, 2012, 09:33:32 PM »
Im in! What's the price range?
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Offline wickedrx7

FD 4-point roll bar
« Reply #5 on: September 20, 2012, 10:56:05 PM »
Looks good. I would make sure it has nice provisions for harnesses and also the stock cargo cover. Are you going to use floor plates on the main hoop? 

1993 Touring, 2012 L99, T-56, Ronnin 8.8, Ohlins, Speedhut, Samberg and lots of custom parts
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Offline justinsamberg

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Re: FD 4-point roll bar
« Reply #6 on: September 20, 2012, 11:23:05 PM »
Im in! What's the price range?
I'm tring to do the 4-Point for under $1000 in chromoly.

I'm looking for a SCCA 4 point.
I think all we would need is a diagonal through the hoop to make it legal. Plus it needs to be made from 1 3/4 .125 wall tubing. I plan on making them all out of 1 3/4 .083 wall chromoly.

Looks good. I would make sure it has nice provisions for harnesses and also the stock cargo cover. Are you going to use floor plates on the main hoop?

It has 1 bung for a y-harness but two more could be added for the H-harness.  The floor plates are 6X6" top an bottom.
http://www.rx7v8.com/
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Offline Sabre002

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Re: FD 4-point roll bar
« Reply #7 on: September 20, 2012, 11:27:47 PM »
I will look up the rules but I was sure it was 1.5" and 0.125 wall.  I think at 1.75 it could be 0.080 if it was CM.
Josh
Stig's sunglass wearing American cousin
74 MGB GT V8 12.83 (75 shot)
93 402 LS2/T56 Rule 3 No V8 RX7's


Offline digitalsolo

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Re: FD 4-point roll bar
« Reply #8 on: September 20, 2012, 11:30:50 PM »
Wow, really nice looking setup there.
Blake MF'ing McBride
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Offline justinsamberg

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Re: FD 4-point roll bar
« Reply #9 on: September 20, 2012, 11:34:11 PM »
The rule may have changed since I last looked. I always remember that they didnt care if it was 4130 or not. It still needed to be .125 wall and the diameter was determined by the weight of the car. That was also an IT cage as well.
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Offline Standing Z

Re: FD 4-point roll bar
« Reply #10 on: September 21, 2012, 08:36:02 AM »
The rule may have changed since I last looked. I always remember that they didnt care if it was 4130 or not. It still needed to be .125 wall and the diameter was determined by the weight of the car. That was also an IT cage as well.

In order to comply with NASA (2500-3000 lb cars) and SCCA (1500 lbs and over) rules, The tube would need to be either:
1.500 x 0.120 Seamless Alloy (4130), Seamless mild steel (CDS Mechanical) or DOM
1.750 x 0.095 Seamless Alloy (4130), Seamless mild steel (CDS Mechanical) or DOM
Doesnt matter if it's Chromoly or Mild Steel

Why not change your tubing size up from .083 to .095 to match these rules? Then you have a street and a race cage all in one package.

Offline Pez

Re: FD 4-point roll bar
« Reply #11 on: September 21, 2012, 09:42:36 AM »
Last time I built an SCCA legal cage, the rules said that the rear diagonals had to connect to the rear floor board, not the strut towers. Rules may have changed tho.  FYI.
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Offline Sabre002

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Re: FD 4-point roll bar
« Reply #12 on: September 21, 2012, 12:43:40 PM »
I know the race shop one got signed off by the SCCA.
Josh
Stig's sunglass wearing American cousin
74 MGB GT V8 12.83 (75 shot)
93 402 LS2/T56 Rule 3 No V8 RX7's


Offline justinsamberg

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Re: FD 4-point roll bar
« Reply #13 on: September 21, 2012, 01:43:47 PM »
The rule may have changed since I last looked. I always remember that they didnt care if it was 4130 or not. It still needed to be .125 wall and the diameter was determined by the weight of the car. That was also an IT cage as well.

In order to comply with NASA (2500-3000 lb cars) and SCCA (1500 lbs and over) rules, The tube would need to be either:
1.500 x 0.120 Seamless Alloy (4130), Seamless mild steel (CDS Mechanical) or DOM
1.750 x 0.095 Seamless Alloy (4130), Seamless mild steel (CDS Mechanical) or DOM
Doesnt matter if it's Chromoly or Mild Steel

Why not change your tubing size up from .083 to .095 to match these rules? Then you have a street and a race cage all in one package.

The bar in my pics is 1 5/8" .125 wall Dom.  Thanks for clearing that up. I will go to an .095 wall then. I'll do something different on the 6 point one.
http://www.rx7v8.com/
Samberg Performance Fabrication
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justinsamberg@gmail.com
925-484-5800

Offline justinsamberg

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Re: FD 4-point roll bar
« Reply #14 on: September 21, 2012, 02:05:53 PM »
Last time I built an SCCA legal cage, the rules said that the rear diagonals had to connect to the rear floor board, not the strut towers. Rules may have changed tho.  FYI.
The diagnol we put in are to help keep the hoop from laying over from a side impact. We want to leave the diagonal out at the main hoop because it keeps the passenger seat from sliding back. I am going to offer it as an option though.
http://www.rx7v8.com/
Samberg Performance Fabrication
Pleasant Hill, CA
justinsamberg@gmail.com
925-484-5800