1990 928 S4
|I wanted to install a racing harness in the S4. I didn't want to spend a lot of money, or do any radical surgury. I wanted to be able to remove them if I needed to, without too much trouble. So I ordered a G-force Harness from DEVEK, they were suppose to fit the 928, install easily, and be removable.|
|I started on the rear harness mounts for the shoulder straps. There are two brackets that mount to the rear shock towers. I removed the 3 17 mm nuts on the top and installed the bracket under the cover. I then reinstalled the cover and nuts. I then looped the belt through the bracket and into the retaining clip. I repeated the process on the other side. There was a short belt with loops at each end that I used to join the 2 rear belts before I attached the belts to the brackets. This helps hold the belts in to correct position, which is important because of the length of the belts. If I had a roll bar/cage, the belts would attach to it.|
|I then started on the crotch strap. I had to drill a hole through the floor to mount the eye bolt. I picked a spot where there were no cables or hoses. I measured the distance under the car, then drilled from the top. I removed the floormat and carpet before I started drilling. I started with a small diameter bit (1/8"), to make sure the hole would be were I expected it. Once I determined the location was correct, I drilled the main hole. I then marked the location on the bottom of the carpet and drilled the hole into the carpet. I inserted the eye bolt through the hole and used a large washer, lock washer, and nut to secure the bottom. When I'm not using the harness, I'll unclip the crotch belt and cover the eye bolt with the floormat.|
The last step was to install the lap belt eye bolts behind the seat. It was easier to find a place for the holes there. I followed the same process to position the holes and drill them as in the front. Once I installed the bolts, I noticed they stuck down pretty far. I decided I should shorten them by about 5/8 ". I used a recipricating saw and vise to cut the bolts. I made sure to have the nut on the bolt before I made the cut. This would allow me to use the nut to clean up the threads afterwards. I then installed the shorted bolts on the car, and check the distance. They're still projecting out a little more then I would want, but I didn't want to remove too much of the threads, just in case I needed to add a second nut (to stop the first from backing out). I attached the belts to the eye hooks, adjusted the lengths, and tried them on.
The entire process took a little over an hour, and the belts and mounting hardware cost a little over $200.
Me trying on the racing harness
Copyright 2000, George A Suennen