5 point harness mount location

[broku518]

Hello,
Wondering about the middle harness part. It should be mounted to the floor.
After I figure the seat location, where to drill the whole? In the seat frame, floor? Also, should it on the edge, or recessed slightly?

Thanks for tips, hints, pics...:)
Broku518

[Avalanche325]

Mine are mounted to the floor, through the steel seat mount plate. So it comes out from under the front of the seat. On our cars with the upright seating position, the function is to keep the lap belt down on your hips and off of your vital organs, vs an anti-submarine function in cars where you are more reclined.

[Jacob McCrea]

I would do a google image search for where and how Simpson (or whoever the manufacturer is) recommends that it be mounted. I had to make the hole in my seat much larger to get the "anti-submarine" belt to bolt to the floor pan where the manufacturer's photos showed that it should go (in relation to how the harness fits my body, not someone else's). You don't attach it to the seat, and my understanding is that bolting the harness to a mount is better, rather than directly bolting it to the floor pan, although the key is making sure the thing won't pull away from the floor pan in a crash. I will try to take a few photos tonight and post what I did (fabricate a mount/attachment point for the belt, as well as a 4' x 5" x 1/8" aluminum plate under the floor pan). I may have 2 extra fabricated mounts, which you can have for shipping.

[Big Blocker]

This is what is preferred . . .

Doc

https://s9.postimg.cc/b52q4e0jj/big_up6pt.jpg (https://postimages.org/)

Notice that the anchor points are not directly below the driver but actually lined up with the shoulders.
If using a single belt, obviously centered but still lined up with the shoulders.

The idea is NOT to keep you from sliding out from under the lap belt, the goal is to keep the lap belt over your hips not your lower abdomen where it will crush you and your spine.

[broku518]

I would do a google image search for where and how Simpson (or whoever the manufacturer is) recommends that it be mounted. I had to make the hole in my seat much larger to get the "anti-submarine" belt to bolt to the floor pan where the manufacturer's photos showed that it should go (in relation to how the harness fits my body, not someone else's). You don't attach it to the seat, and my understanding is that bolting the harness to a mount is better, rather than directly bolting it to the floor pan, although the key is making sure the thing won't pull away from the floor pan in a crash. I will try to take a few photos tonight and post what I did (fabricate a mount/attachment point for the belt, as well as a 4' x 5" x 1/8" aluminum plate under the floor pan). I may have 2 extra fabricated mounts, which you can have for shipping.

Thanks Jacob,
I will google to see more pics and check the Simpson's site as well. I got the FFR supplied set.
Interested in those mounts as well.
Thanks,
Martin

[Jacob McCrea]

Martin,

This is the mounting point I made for the 5th belt. I have the parts for two more already made, and if you can wait a few days until I finish welding some other parts, I'll weld them up and ship them. Just send me your address via private message.


84273

[broku518]

Martin,

This is the mounting point I made for the 5th belt. I have the parts for two more already made, and if you can wait a few days until I finish welding some other parts, I'll weld them up and ship them. Just send me your address via private message.


84273

PM sent, thanks!

[cgundermann]

Martin,

This is the mounting point I made for the 5th belt. I have the parts for two more already made, and if you can wait a few days until I finish welding some other parts, I'll weld them up and ship them. Just send me your address via private message.


84273

Good idea Jacob, I never liked the obvious mounting position.

Chris

[CraigS]

While it is best to have the crotch strap come up through the seat, it can be mounted in front of the seat. It won't have much effect on keeping one from sliding forward but that is more important in a lay down seating position as in a formula car. In our cars the lap belt will keep us from sliding forward. The crotch belt will keep the lap belt from riding up and ruining your internal organs in a crash though. I don't use mine too often but when I do, this is my procedure. Connect all 5 belts but adjust them loose. Tighten the lap belt as tight as possible. Next tighten the crotch belt as tight as possible. Tighten the shoulder belts just a little looser than max tightness. IMHO, if you don't have a crotch belt, don't use the shoulder belts.

[edwardb]

While it is best to have the crotch strap come up through the seat, it can be mounted in front of the seat. It won't have much effect on keeping one from sliding forward but that is more important in a lay down seating position as in a formula car. In our cars the lap belt will keep us from sliding forward. The crotch belt will keep the lap belt from riding up and ruining your internal organs in a crash though. I don't use mine too often but when I do, this is my procedure. Connect all 5 belts but adjust them loose. Tighten the lap belt as tight as possible. Next tighten the crotch belt as tight as possible. Tighten the shoulder belts just a little looser than max tightness. IMHO, if you don't have a crotch belt, don't use the shoulder belts.

Whoa. Have to respectfully disagree with that. That's a pretty big safety no-no. I understand completely that the crotch strap is a necessary part of the 5-point harness and should be used all the time. We do. But don't ever drive these cars without shoulder belts. Even a hard stop or otherwise minor "incident" could face plant you (or your passenger) into the steering wheel, dash, etc. With no air bags and hard surfaces all around, you need to stay planted back in the seat. Better yet, install all the belts and use them all the time.

[Big Blocker]

A B S O L U T E L Y !! if the belts are there, use them.

Doc