mounting harnesses on rear pillar bar - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

RedlineRacer · 10-15-2004, 08:37 AM

Is this a good idea? Do you think a rear pillar bar would be strong enough to hold you if you ever needed it? I was thinking about maybe buying one and welding on some tabs and hooking a 4pt harness to it.

justinhustle · 10-15-2004, 09:00 AM

my 4 point harness is mounted the way schroth designs...to the rear seat belt mounting points and the front ones...why cant you use those?

AKADriver · 10-15-2004, 09:34 AM

nooooo!

In order of preference:
- roll bar/cage
- properly designed heavy gauge "harness bar"
- factory rear seat belt hard points

and nowhere else.

meme · 10-15-2004, 10:31 AM

used 50mm eye bolts for the lap belt on the left side. the right side i made a tab and welded it to the rail and used 20mm

justinhustle · 10-15-2004, 10:54 AM

thats how mine look

autobahNESSA · 10-15-2004, 12:17 PM

I've been told that you need to mount the harness to shoulder level or @ shoulder level. Mounting below the shoulders, if you get into an accident, the harness will pull down on you, forcing your back to compress and injuring you. If you look at what forces can apply in an accident it does make some sense, and harness mounts built into a cage all are at shoulder level.

Just what I heard, something to think about.

pruto · 10-15-2004, 12:26 PM

meme, thats how i mounted mine
but as bayarea240 says, it needs to be shoulder level, i think the recommended amount is at least 45 degrees. but then again, you theoretically need a 5 point anyway to prevent submarining, and even if you do have a 5 point mounted correctly, if you don't have a roll cage, you're screwed in a rollover, and you have a roll cage, well, we wouldn't be having this discussion on where to mount your harness

BoroBoroS13 · 10-15-2004, 02:25 PM

Dont mount it on a rear piller bar, its a really bad idea... I would either use the factory rear seat points or a roll bar/cage w/ a hanress bar.

phrozen · 10-15-2004, 05:25 PM

why is it a bad idea?

andrave · 10-15-2004, 08:03 PM

don't use anything but a harness bar, including the stock mounting points. if your stock seat breaks or bends (and shit you wouldn't believe how much a seat gives during a collision) and the harness is mounted right behind the seat, parallel with the floor, its going to hold you right where you are no matter what. If its mounted to the rear seat mounts, and the seat brakes, you are gonna get tossed around.
And, if you complain "but I don't have a bar to mount it to..." well, 4 point or 5 point harnesses hold your head upright, so when the car rolls over your head is going to get smashed in by the roof. So you really shouldn't use them unless you have a roll bar anyway. Which gives you a convenient place to mount them.
problem solved!

RedlineRacer · 10-27-2004, 09:48 AM

Quote:

Originally Posted by bayarea240

I've been told that you need to mount the harness to shoulder level or @ shoulder level. Mounting below the shoulders, if you get into an accident, the harness will pull down on you, forcing your back to compress and injuring you. If you look at what forces can apply in an accident it does make some sense, and harness mounts built into a cage all are at shoulder level.

Just what I heard, something to think about.

Yep, thats why I asked. I read that somewhere and it sparked an interest.

10-15-2004, 08:37 AM	#1
RedlineRacer Zilvia FREAK! Join Date: Sep 2002 Location: Clemson, South Carolina Age: 40 Posts: 1,054 Trader Rating: (0) Feedback Score: 0 reviews	mounting harnesses on rear pillar bar Is this a good idea? Do you think a rear pillar bar would be strong enough to hold you if you ever needed it? I was thinking about maybe buying one and welding on some tabs and hooking a 4pt harness to it.

10-15-2004, 12:26 PM	#7
pruto Zilvia Addict Join Date: Jan 2003 Location: Los Angeles Age: 43 Posts: 982 Trader Rating: (1) Feedback Score: 1 reviews	meme, thats how i mounted mine but as bayarea240 says, it needs to be shoulder level, i think the recommended amount is at least 45 degrees. but then again, you theoretically need a 5 point anyway to prevent submarining, and even if you do have a 5 point mounted correctly, if you don't have a roll cage, you're screwed in a rollover, and you have a roll cage, well, we wouldn't be having this discussion on where to mount your harness __________________ Paul Black and Red

10-15-2004, 02:25 PM	#8
BoroBoroS13 Zilvia Addict Join Date: Dec 2003 Location: Nor Cal Age: 41 Posts: 657 Trader Rating: (1) Feedback Score: 1 reviews	Dont mount it on a rear piller bar, its a really bad idea... I would either use the factory rear seat points or a roll bar/cage w/ a hanress bar. __________________

10-15-2004, 05:25 PM	#9
phrozen Zilvia FREAK! Join Date: Apr 2003 Location: Bay Area Posts: 1,352 Trader Rating: (0) Feedback Score: 0 reviews	why is it a bad idea? __________________ This box is 400x200: Please do not put your sig pic back if it exceeds this. -Moderation

10-15-2004, 09:00 AM	#2
justinhustle Nissanaholic! Join Date: Mar 2003 Location: ohio Age: 45 Posts: 1,693 Trader Rating: (0) Rides Gallery: justinhustle Feedback Score: 0 reviews	my 4 point harness is mounted the way schroth designs...to the rear seat belt mounting points and the front ones...why cant you use those?

10-15-2004, 09:34 AM	#3
AKADriver Post Whore! Join Date: May 2002 Location: Springfield, VA Age: 43 Posts: 3,517 Trader Rating: (1) Feedback Score: 1 reviews	nooooo! In order of preference: - roll bar/cage - properly designed heavy gauge "harness bar" - factory rear seat belt hard points and nowhere else.

10-15-2004, 10:31 AM	#4
meme Zilvia FREAK! Join Date: Jan 2003 Location: glendale,CA Age: 48 Posts: 1,094 Trader Rating: (8) Feedback Score: 8 reviews	used 50mm eye bolts for the lap belt on the left side. the right side i made a tab and welded it to the rail and used 20mm

10-15-2004, 10:54 AM	#5
justinhustle Nissanaholic! Join Date: Mar 2003 Location: ohio Age: 45 Posts: 1,693 Trader Rating: (0) Rides Gallery: justinhustle Feedback Score: 0 reviews	thats how mine look

10-15-2004, 12:17 PM	#6
autobahNESSA Zilvia FREAK! Join Date: Aug 2002 Location: Milpitas/Irvine, CA Posts: 1,257 Trader Rating: (3) Feedback Score: 3 reviews	I've been told that you need to mount the harness to shoulder level or @ shoulder level. Mounting below the shoulders, if you get into an accident, the harness will pull down on you, forcing your back to compress and injuring you. If you look at what forces can apply in an accident it does make some sense, and harness mounts built into a cage all are at shoulder level. Just what I heard, something to think about.

10-15-2004, 08:03 PM	#10
andrave BANNED Join Date: Apr 2002 Location: Burton WV Posts: 2,350 Trader Rating: (0) Feedback Score: 0 reviews	don't use anything but a harness bar, including the stock mounting points. if your stock seat breaks or bends (and shit you wouldn't believe how much a seat gives during a collision) and the harness is mounted right behind the seat, parallel with the floor, its going to hold you right where you are no matter what. If its mounted to the rear seat mounts, and the seat brakes, you are gonna get tossed around. And, if you complain "but I don't have a bar to mount it to..." well, 4 point or 5 point harnesses hold your head upright, so when the car rolls over your head is going to get smashed in by the roof. So you really shouldn't use them unless you have a roll bar anyway. Which gives you a convenient place to mount them. problem solved!