520

I got this 6-point bolt in Schroth harnesses. Picked them up cheap but the caveat is that shoulder straps are really short - I think they are F1 style harnesses. So in order for me to install these in the Coupe I would need a harness bar right behind my seats. I have an idea of fabricating a bar that would bolt in to the B-pillars but my concern is if it would be safe? - as oposed to having it welded in.

This is still dual purpose car so I would like to have an option of removing it when needed.

Another option I guess would be to simply get longer shoulder straps that would attach to the rear strut brace, which could act as a harness bar too. I'm not sure if I could buy shoulder straps only for example and not a full kit.

What are your thoughts?

skabaru

but sparco sells the parts all seperate. Get longer shoulder straps.

allroad'Ed now

but isn't just a cross bar. It needs to be triangulated to a third point. Your rear strut brace won't cut it unless it's welded in, and then triangulated to a third location.

There are Porsche harness bars out there which work great but are close to the price of a good roll bar because of the strength and bracing in them. Why not just get the Schroth shoulder straps that are designed to bolt inot the rear lap belt locations. They were designed for that application, and thoroughly tested by Schroth.

PNS Lazy Bastage

I wouldn't try to fab one. When it comes to safety just pay the cash.

911eric

Unless maybe you're just doing autox. Like Ed says, a true "harness" bar is much more than a simple cross bar.

i'd get longer straps and affix to a firm location.

520

Brey Krause harness bar as an example..
<img src="http://www.pelicanparts.com/techarticles/911_harness_install/harness1.jpg">

I could replicate the same design and with pro's input on what material/sizing to use I could have it welded and bolted in.

520

Yeah, I'll probably do that then. Have to check.

520

"Made of Stainless Steel, this harness guide bar will give you something to route your shoulderbelts over before mounting them to the rear seat anchors. This will help alleviate the steep angle needed to put shoulder harnesses in a 911.

This bar is designed as a guide bar only, and is Not designed to take the full load of shoulder belts! You must feed your shoulder belts over this bar, and then attach them to the factory rear points."

talks about same design bar I posted the picture of - i was under impression you can just attach harnesses to that. Thanks for your input guys.

allroad'Ed now

have an additional bar that connects the harness bar with one of the lower rear lap bolts (or two in some applications). This effectively triangulates the bar for added stiffness, and so it doesn't twist on the two shoulder belt bolts that attach it to the B-pillars.

Early harness bars were prone to pivoting on the two bolts on the B-pillar. Some manufacturers have added a right anble piece of steel which hugs the B-pillar vertically so that the harness bar can't spin, but not what I'd prefer. And by adding an additional leg from the center of the harness bar down to the lap bolts, you're stiffening the harness bar in the center as well.

For materrial, most of the B-K harness bars are made out of the same type of DOM seamless material as roll bars.

allroad'Ed now

Racing seats have holes in the headrests to guide the harness. Most harness bars are purely to compensate for seats that have a fixed solid headrest (Like virtually every Porsche which is why there's a big market for Porsche harness bars.) In this application, shoulder harnesses will fall off your shoulders unless held in place by something. Our Audis have adjustable head rests so the top of the seat back, and the head rest posts can act as the guide.

And for additional support, you can add a sternum strap to the front of the harnesses too- this strap has a buckle, and ties both harnesses together across your sternum for extra safety.