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Beaky's Bar

I don't think you can install a harness without a harness bar of some sort. The only other option to obtain a half reasonable angle on the shoulder straps is, pretty much, to run them to the back of the car or, perhaps, boot floor a good way back.
 
I certainly feel that I would like the security of a harness to keep me more securely in my bucket seat should the worst happen, though my standard seat belts did a sterling effort when I had my crash last year. The trouble is how to secure the harness properly without installing a full cage or hoop.
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Easy peasy..........................

A simple (substantial ie: fit for purpose) harness GUIDE bar that bolts onto and betwen the rear upper seat belt mounts (a la 968) How do I know.............I`ve got one (that admittedly needs minor adaptation - when I get around to it one day)

You can then utilise the Brey Krause adapters to bolt the harness to an existing seat (not recommended if it has no rear harness holes) and they also do a harness GUIDE bar.

Dont simply bolt them to the floor via the rear shoulder harness holes for in a big frontal you`ll be liable to suffer major spinal compression from the straps, they need to be near horizontal.

Using a harness GUIDE bar allows you to utilise two bolt through reinforcing plates in the boot floor behind the tank (ie: accessible) I have seen 968`s use the captive bolt threads in the boot above the tank (might be in some 944`s) but I`m absolutely positive that two M10 bolts IIRC are insufficient and do not therefore believe they are for this purpose although am happy to be proved wrong.

The other alternative may be to run them over the harness guide bar and back to the rear seat belt mounts but you`ll probably need to weld on anti spread guides to the harness guide bar.

I know Paul you have a proper seat, however I still feel strongly enough about it to reiterate the complete unsuitability of the standard seats when used in conjunction with a harness.

Always use a seat with rear shoulder strap holes so the straps sit on your inner shoulder (the standard seats spread the straps too far in my honest opinion) and you may slip out if inverted or in a sideways punt there`s a chance you`ll drive the shoulder strap down the seat side.

The lap straps also need to be vertical and not inclined back too much as this helps prevent `submarining`, ensures the straps are over the hips and removes the tendancy for them to allow the lap strap to ride (arc) up into your stomach if angled backwards when the shoulders and body strain the shoulder straps and pull up on the lap strap.

You`re probably better off in a standard inertia reel if the harness is not fitted properly.
 
Paul.
The bar you have in your car.?? Is it a straight bar from mount to mount.?? IE "C" pillar to "C" pillar.???
If so, i hope its a good strong bar....???
Ive seen some of these, in fact i owned one , many moons ago.. But they were dangerous because they were found to bend / flex if any forward forces were exerted on it...Ie as in a frontal impact....
Thats why i got a BK bar.. A lot more substantial....+ braced aswell....
Got any pics of your bar.???
 
Paul.
The bar you have in your car.?? Is it a straight bar from mount to mount.?? IE "C" pillar to "C" pillar.???
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Hi Dave

Its not in the car (yet) and may not go in as I dont intend to alter the car much as I`ve other projects I`m playing with instead [8D] however the caveat to my post was that it needs altering. It does indeed bolt to the rear C pillars but I always felt its not enough as the forces on it in an impact will be huge so a bit of triangulation is in order. I was going to triangulate it `say` 25% of its length each end back to the B pillars if you can see what I mean. The BK ones indeed do that.

I left off my previous post that in using a harness bar, in an ideal world, you would also ensure that you restrain the straps on the bar from moving laterally and not just wrap them around - in particularly if the straps are not uniformly parallel throughout their length for if wider where bolted in they will spread apart over the bar when tensioned in a crash.

The best way is on a roll cage on a dedicated bar with minimal span lengths and short rear extensions.
 
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