I searched online and most sites seem to say that I have to clip the two crutch straps to the same anchor points (eye bolts in my case) as the lap belts. However, I haven't been able to confirm this with any manufacturer's web sites and I noticed yesterday in a fellow racer's car that he had mounted the straps at anchor points under the seat around the middle of the floor, as one would moint the crutch strap in a 5-point. Which is the correct way? I can't seem to find the answer in the rule book or in the weird OMP instructions...

 

I went 'round and 'round about this, too, when it came time to mount mine. All the manufacturer instructions show the two anti-submarine straps going down through the seat, like a 5-point, but at angles. The problem is, there's no point in having a 6pt. over a 5pt. if they're going through the same hole, as all seats have, and no one makes an OTS 2 hole seat.

The fact is, you won't find a manufacturer illustration showing you to run the belts to the same eyebolts as the lap belts, but the SCCA rule book, and many people I talked to on here say that's how you do it.

SCCA GCR Section 20.6 states, "It is also permissable for the legstraps to be secured at a point common to the seatbelt attachment to the structure, passing under the driver and up between his or her legs to the seatbelt release or shoulder harness straps."

I run mine this way, and they are extremely comfortable.

 

Wow, now I'm even more confused... I had assumed that I would run them through the center hole in the seat and clip them at the anchor points of the lap belts. I see that you pass them through the side holes of the lap belts in that picture.

 

yes, mine are run the same way. While it looks funky (I was quite dubious at first) it is really quite comfortable.
Run to the lap belt holes and attach to the same anchor points. Just make sure the anchor points are nice and solid.

 

I agree with what's been said. I hooked mine to the same eye bolts as the side belts and ran them through the same side holes in the seat. I sit on top of the sub belts, then bring them up from underneath to click in to the cam lock. It feels very secure (like a climbing harness). After doing it this way, I don't think I'd go back to the 5pt mounting.

 

So if I'm reading this right, the mounting of a 6pt takes one less mount than the 5pt, thus making the installation of a 6pt easier. ....Never would I have imagine that!

 

I don't think I can hook them up that way as the crutch straps are attached together to the cam-lock mechanism (other 4 belts plug into that piece which is permanently fixed to the crutch straps).




Modified by Civic44 at 4:00 PM 5/3/2005

 

I mounted mine crotch belts to the bolts that hold the front of the seat down, lap belts are mounted to the stock seat belt locations, shoulder belts from the cage.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by speedracer33 &raquo;</TD></TR><TR><TD CLASS="quote">I mounted mine crotch belts to the bolts that hold the front of the seat down, lap belts are mounted to the stock seat belt locations, shoulder belts from the cage.</TD></TR></TABLE>

Mine was mounted that way when I bought my car (already built by someone else). I changed it because I wasn't sure if it was legal or safe. The problem with that setup is that if the seat comes lose from those mounts, so do your belts. If your crotch belts are bolted to another location, you and the seat are both still held in place if the seat mounts fail. That change was my motivation to go with my current setup. I'd suggest trying it out to see if you like it since you should have all of the pieces you need (except maybe the ends to hook onto the eyebolts).

- Scott

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Civic44 &raquo;</TD></TR><TR><TD CLASS="quote">I don't think I can hook them up that way as the crutch straps are attached together to the cam-lock mechanism (other 4 belts plug into that piece which is permanently fixed to the crutch straps).

</TD></TR></TABLE>

I don't see that it makes any difference... my sub belts are also attached together. Whether the lock mechanism is attached to the sub belts o the lap belt shouldn't amek any difference.

 

Yeah, I just re-read the other posts. Indeed, the fact that the camlock is on the crutch strap does not prevent one from wearing it in the way that was specified.

 

I have the same OMP belts as you do Vince. I was running a Leaf 5 point prior to this set up and mounted the 5th point to an eyebolt mounted on the floor just in front of the bottom seat hole. With the 6th point I added another eyebolt so that both straps have a place to properly mount. I used huge backing washers when mounting those eyebolts to the floor.

 

Found this on cornercarvers:

http://corner-carvers.com/wiki...ssues

NEVER use 5 point harness. Use a 6 point with the anchors mounted rearward of where your buckle ends up. The best way is to lay the sub belt on your seat and mount it to the same place as your lap belts. The idea of the sub belt is not really to keep you from submarining. It's real use is to stop the forward motion of your torso. To do this the sub must be stretched opposite to the direction of the force (the idea that you can't push a wet noodle). The closer you mount the belt to the horizontal direction, the sooner the system tightens up and stops your body. By actually sitting on the sub like I mentioned, it acts like a parachute sling making the belts very effective. I have tried this on the Supra and found it a little uncomfortable at first, but I got used to it. Of course I then crash tested the set-up and found that my belts held me in place very well, even hanging upside-down!

 

Something about that arrangement where the sub belts route to the lapbelt points don't make sense to me.

I always thought the subbelt was there to counteract the pulling-up of the lapbelt caused by the shoulderbelts. In a front end collision, the shoulderbelt pulls up on the lapbelt such that without the sub-belt, the lapbelt slips over the hipbone and onto your guts. So essentially, the lapbelt stops most of your body from going forward into the steering wheel and dash by squishing your guts.

If the lapbelt stays low and over your hipbones, the lapbelt does it's job by stopping your body by your hipbones, not your guts.

So with position of the subbelts coming from the lapbelt points, I can see it helps a little, but I can't see a way the sub belts would provide enough of to oppose the force of the shoulderbelts.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Another Drew &raquo;</TD></TR><TR><TD CLASS="quote">
So with position of the subbelts coming from the lapbelt points, I can see it helps a little, but I can't see a way the sub belts would provide enough of to oppose the force of the shoulderbelts. </TD></TR></TABLE>

It works because as you slide forward in the seat, the sub belt coming from underneath you is pulled down. This counteracts the force of the shoulder belts pulling up. I don't think the lap belts will slide up, however, I will say that I do feel like my body could possibly be lifted slightly out of the seat in that scenario. I still think it's safer than the 5pt though where it seemed as though I still had a lot of forward play with the sub belt coming up through the mid-front of the seat. Maybe the ideal setup would be a seven point that incorporated both of the 5 and 6 point style sub belts. That would be super obnoxious to get in and out of though.

 

whats that stain on your seat?

 

i have a six point and feel that it is much much much more comfortable then the 5 point, and i understand what you are saying Drew but the with the six point mounted as pictured it keeps you there in the seat, and for me on my seat the 5th point really wouldn't come into contact with me until i was being accelerated forward.

Another thing to mention i think it important to have every point of the seat belt have its own anchor, and for those anchors to be independent of the seat.

 

I was reading in the FIA regulations, and there is a provision for when the same anchor point is used for several belts (it has to be twice as strong).

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Tyson &raquo;</TD></TR><TR><TD CLASS="quote">whats that stain on your seat? </TD></TR></TABLE>

It was there when I bought it (used). Hopefully it's not a crash stain.