Roll Cages
- Thread starter Focuz_Freek_XxX
- Start date
lasermp5 said:
The car in the link posted is mine and that's my install write up. The harness is a Schroth Rallye 4 which is designed to be mounted in that manner. Schroth does a lot of testing to DOT certify their harnesses for street use. They have been crash tested.
You are correct that you do not want shoulder belts mounted at much of an angle from the seat back. In event of an accident ythe tension in the belts would pull down on your spine and compress it, possibly resulting in injury. However, Schroth has "ASM" (Anti-SubMarining) which allws slack in the shoulder harness during impact. This keeps you from sliding under the lap belts, but also keeps your spine from being compressed in the same manner as if it were a solid belt. Is this harness ideal, no. Will it do, sure. I can't get rid of my back seat and this belt uses the stock belt anchor points, which have been tested for loads. Plus, I don't make the shoulders straps extremely tight. The lap belts doing most of the work.
I would have to disagree with this statement also. If you don't have a harness and you roll hard enough to compress the roof 3-4 inches (which judging by rollover crash pics of our cars that would be one hell of a force) you will be experincing quite a few g's at impact. With a harness your body stays put. With your stock 3 point belt your body is going to go in whatever direction it can to get out of that belt and if you hit something it will be at around that g force. So during a rollover these side forces would be tossing you around a lot more then in a 4 point harness.
Judging from rollover pics of our cars on the freeway, I feel safe enough wearing that harness at the track. Were I in an accident with a high enough g impact to collapse the roof enough to touch my helmet I probably wouldn't be tapdancing, harness or not. Is it ideal, no. Would I feel safe about using it in any car without a rollbar? No.
Judging from rollover pics of our cars on the freeway, I feel safe enough wearing that harness at the track. Were I in an accident with a high enough g impact to collapse the roof enough to touch my helmet I probably wouldn't be tapdancing, harness or not. Is it ideal, no. Would I feel safe about using it in any car without a rollbar? No.
I see. Didn't know schroth had different capabilities over a regular harness... say sparco clubman. Anyways, I do want to autocross a bit, but mostly I would like to wear my harness on the street sometimes too... and for that I will want a harness bar at least.
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- MP5T / 944
Oct 03/05
Investing in a Roll Cage made for the 944.
Investing in a Roll Cage made for the 944.
autopower makes one, I had a brief stint with one.
id have to completly agree on this stament. i use mine strictly for track but i love all the good staments in this tread. yes you should use much lager mounting platforms and they also want you to idealy have the mounts on two perpendicular surfaces anyway. oh and weld this stuff in too!! its when we crash at speed or not experianced or not. why do you where a helment. lets just say s*** happens guys and girls. if your doing it for a show car then who cares just slap anthing in there. but im in Mid West council that has a few pages on how there cadges must be made and instaled. anway i like my harnes with out roll bar my class dose not require it so its just extra weight. and i need that harness kinda skinny and i slide around alot in mine plus i have been in a bad crash with a tire wall and i was thanking god that i had it. or i would have had a stick shift up my u know what yeah i cant spellMallard said:
Mallard,
In a frontal/side impact you would be "ok". but if you were to flip over, laser is correct, the angle of the belt would result in compression of the spine regardless of how much the roof caved in. You shouldn't have the shoulder belts more than 10* from your back angle.
http://www.simpsonraceproducts.com/safety/safety.aspx?page=restraint_info
In a frontal/side impact you would be "ok". but if you were to flip over, laser is correct, the angle of the belt would result in compression of the spine regardless of how much the roof caved in. You shouldn't have the shoulder belts more than 10* from your back angle.
http://www.simpsonraceproducts.com/safety/safety.aspx?page=restraint_info
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- MSP 1145
subing...
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- MP5T / 944
Rogue Pro5 said:
That is what I did...
Rogue Pro5 said:
As long as you don't roll over
This is probably fine for you since you prob only use your harness for autox correct? However, If I'm spending the money on a bride, sparco harness bar, and takata... I sure as hell want to use them on the street. For this reason, I need the harness bar. I like my spine the way it is now, thank you.MiaTurbo said:Mallard,
In a frontal/side impact you would be "ok". but if you were to flip over, laser is correct, the angle of the belt would result in compression of the spine regardless of how much the roof caved in. You shouldn't have the shoulder belts more than 10* from your back angle.
http://www.simpsonraceproducts.com/safety/safety.aspx?page=restraint_info
No, with the belts at more then a 10* angle you would compress your spine in a frontal impact as well. Actually, you'd probably have less to worry about in the spine compression area in a rollover. If you rolled over there would be no downward force pushing your body in the seat. Problems arise when your body wants to travel forward and it puts the belts in tension, which in turn pulls down on your spine. Since you're firmly planted in the seat that force can't go anywhere but into your back.
I fully understand how to mount a belt and why it's done that way. If you read my above posts you'll see me explain that the Schroth Rally 4 is not a solid belt. The shoulder belts will release slack in an impact so the tension of the belt will not pull down on your spine. The Rally 4 is approved for street use in the vehicles listed on their site. The mounting points are the same no matter what vehicle it goes in, but they have not gone to the trouble to certify the belts for every possible car. ($$) This is the only reason I felt comfortable wearing it at more then just an autocross.
only the shoulder belts release a little slack, it keeps you from submarineing in the harness. In case you don't know, unlike a 5 point harness, a 4 point harness has nothing to hold the belt around your waist. It's possible in a collision (if the shoulder straps push you down in the seat) that you'll slide under the bottom belt a bit, causing the lap belt to hold you across the stomach (that's bad). The slack that is allowed is only enough to keep the lap belt in your lap.MiaTurbo said:
fastmazda1
Member
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- 2003.5 speed protege
that cage looks nice but is there a top hoop and frount section avalible for the msp or is that it
fastmazda1
Member
- :
- 2003.5 speed protege
how does it look , is it for strictly racing or is it showable
We Are Ninja
Member
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- 2006 Mazdaspeed 6 GT; 2004 Mazda 6 Wagon
Wow. Lotsa good info in this thread... I'm looking for a harness bar and harnesses simply to keep me planted. I'm sick of sliding around in the seat...
