Best place to bolt lap belts with seat mounted to cage

[240zdave]

I got my cage builder lined up. While thinking about what I wanted to do with the new cage, it occurred to me that I might want to change where the lap belts are bolted. In the old car I used the factory connections for the lap belts, but my seat was also mounted to the factory seat brackets in the floorboard. If I got hit hard enough from the side in the old car, the seat and lap belts would move together, independent of the cage.

Now, with the new rules allowing the seat to be mounted to the cage (or more specifically to framing attached to the cage), should I be bolting the lap belts to the cage as well?

[seckerich]

Yes, and be sure to have proper tabs/tubes installed for 5th or 6th points. I expect 5 point belts to be gone soon with 6 being minimum so be prepared. Good luck with the build.

[240zdave]

Yes, and be sure to have proper tabs/tubes installed for 5th or 6th points. I expect 5 point belts to be gone soon with 6 being minimum so be prepared. Good luck with the build.

When you say tabs or tubes for the 5th and 6th points, are you talking about tubes through the seat frame supports for thru-bolts, and tabs for bolting outside the frame supports? This may be one of those times when a picture is worth blah, blah, blah.

[seckerich]

In the rear for the lap belts we use 1/4 thick tabs to bolt the harness in or to attack anchor eyes for snap in style. If you run a bolt through a tube it should be sleeved to prevent a break point. Just sold the last 2 cars with this setup so I will see what I have pictures of.

[240zdave]

If you run a bolt through a tube it should be sleeved to prevent a break point.

That must be what the GCR means when it says "Holes in the roll cage to accommodate the installation of the harness must be bushed and welded completely."

[rsportvolvo]

For gaps in the GCR I always look at the FIA specifications. Frankly I trust the FIA specs a bit more as they back up most of their findings with engineering and testing. There are a few diagrams of seatbelt mounts and the rollcage bushing you mentioned. Take a look at this:

http://argent.fia.com/web/fia-public...11)-080910.pdf