Jack Ennuste

I installed GT3 carbon racing seats to my 993, but don't find anchor points for my 5-point racing harnesses. Stock seat belts used one installed to the seat. Should I use seat side plate? And lower center belt?

Anybody?

ilko

Here's what I did in my old RSA, which was approved by PCA tech inspection before tracking the car: http://web.me.com/ilko/RSA_Black/How...rsche_911.html

race911

More than you ever wanted to know, but could save you from serious injury or death (you have to download the file from the link): http://www.hmsmotorsport.com/researc...s-installation

If I'm reading correctly about mounting on the "seat side plate", you do not want any belt mounted to anything but the chassis. Whether you do that on the door side with the existing bolt is up to you. But the inside anchor point has to be at a drill through point, with proper backing plate (like Ilko's). Crotch strap location is self-explanatory once you look at the mounting schematic.

For the shoulder harness, it must be attached at the proper height to a proper roll hoop. And pay critical attention to height of the shoulder/harness bar on that hoop in relation to the height of your shoulders when seated AND the belt holes in the seat.

Paul902

Jack, check out bkauto.com. They have some parts like sub-belt bars that might be useful to you.

JPS

A) I think the GT3 seat has a BK option to bolt to the seat
B) + 1. These guys know their stuff.

It was relatively common thinking that the sub belts (or anti sub belts) only held the lap belt in place. Through testing I think with these guys, it showed the subs had to hold up to something like 1500 lbs of force at I think 35 mph. I might have the specifics off, but it was pretty surprising.

Bill Verburg

I'd use the RS mounts or there is an outfit in England that has a sidemount w/ integral belt mount ala GT3, but I can never remember the name

Ed Hughes

The BK mounts function the same. The bolt to the seatbelt mounts on the floor, keeping those intact (or not) and provide aluminum loops to secure the two beltline belts.

Bill Verburg

Thats not the issue, the door side is easy, just use BK or Rennline hardware

on the tunnel side you need something like the RS mount or a seat sidemount w/ integral hardpoint for the belt
RS tunnel side stock seatbelt mount


3mm washers that accompany the RS mount, for the other 3 corners of the seat rails




for the subs you can use pad eyes


or GT3 sub bar
here's the whole shebang ready to mount in the car



the tunnel mount for the harness is a pad eye mounted per the factory

Bill Verburg

here it is mounted, you can ssee the harness pad eye aft of the tunnel side seat mount, and Rennline hardware on the stock door side hardpoint. w/ GT3 sub bar

Nollie

I did the same as ilko using the measurements on the diagram Bill posted.

Ed Hughes

I guess I don't understand-unless the 993 chassis is different? I used the tunnel side mounts from BK. They clear my Profi SPG XL and keep the stock belt mounts that stand up.

http://www.bkauto.com/porsche/r9001.php

Ed Hughes

They offer two others:

http://www.bkauto.com/porsche/r9004.php
http://www.bkauto.com/porsche/r9005.php

Jack Ennuste

Thanks pals! Super helpful. Didn't expect so much info reply. True motorsport spirit here!

Bill Verburg

a 993 does not have floor mounted seat belt mounts on the tunnel side. The stock tunnel side belt receptacle mounts to and slides w/ the seat. It's best to retain that feature which the RS mounts do. BK does offer a similar item but the RS, the associated 3mm washers and the GT3 sub bar all work as a system, all have 3mm thickness to keep the seat level on the track. The subs and stock belt receptacle will all slide w/ the seat ensuring best fit and performance, only the harness ends will then be mounted to chassis hard points.

Ed Hughes

Got it, I'll take a closer look at my 993. The third option I posted mounts to the seat rail, and now I suppose that is why it exists.