anti-sub straps

[fve]

Terry wrote:

I think there are two schools of thought, neither supported by data, so take your pick. The old, tried and true racer approach is for the harnesses to be anchored to the car, not the seat, necessitating eyebolts through the floor for the lap belts and the sub belt. The other approach is to trust Porsche and the USDoT that the seats are anchored with sufficient strength to hold the harnesses. Standard three point belts, which are crash tested, mount to the seats. The question is whether the higher forces which are possible in a racetrack wreck could cause the seat or rails to fail. Personally, I doubt it but it's a personal decision. All of the Brey Krause stuff for these seats attaches to the seats, not the floor.

About the B-K stuff, that is a very good point. the lap belts are supposed to attach to the seat (based on the porsche material, mounting points available from BK and others). In a frontal crash (or rollover) arent the lap and shoulder belts supposed to absorb the majority of force and the ant-sub belts are primarily there to keep you in place and make sure the other belts do their job? thus, why is it so important to mount the sub-belts to the floor when the lap belts are mounted to the seat. inquiring minds would like to know.

I know that BK (and others) also offer a mounting point for the door-side that attaches to the OEM seat belt attachment point instead of the of the seat. Is this superior to the seat. Or is it worse since one side is to the chassis (door side) and one side is mounted to the seat (tunnel side). I imagine that it could create some interesting torque forces on the seat and driver in a crash.

And that gets into seat-back braces. I have brackets already welded to the bar (based on design, would guess BK). Wouldnt that be more import than floor mounting the sub-straps.

Please understand, i am not trying to be argumentative. I love playing Devil's advocate. I would like to understand what the region requirements are and what is a safe set-up without getting into unneeded modifications that do not have any real-world benefits.