Up ] Engine How To's ] Reliability Mods ] RX-7 Notes ] RX-7 Glossary ] Modification Pros & Cons ] My RX-7 ] Brake - Big Brake Install ] Brake Line Replacement ] Brake Proportioning Valve Install ] Brake 929 Master Cylinder Install ] Brake Line Flaring ] Brake Bleeding ] Brake Master Cylinder Bleeding ] Shocks & Springs Install ] Antiroll Bar Bushing Upgrade ] Gauge Install ] Short Shifter ] Antenna Replacement ] Turbo Timer Install ] [ Racing Harness Install ] Racing Seat Install ] Hand Grip Repair ] Raise Rear View Mirror ] Fog Light Install ] Daytime Running Lights ] Safety Wire ] Polish Aluminum ] Repair Door Lock ] Trailer and Hitch ] Buy a Used RX-7 ] Other How To's ] More Hints and How Tos ]

How to Install a Racing Harness

By Rob Robinette

The cool thing is that you can do this mod and then just unclip the racing harness and everything looks completely stock. The stock seat belt can stay in place and be completely functional.

Seat belt install simpson.jpg (4621 bytes)

It's very easy to install the two seat belts, just replace the two seat belt anchor bolts with eye bolts from Racer Wholesale and clip the harness to them. Just order standard harness eyebolts, they fit, you don't need special metric bolts. Some sanctioning bodies require steel backing plates (available from Racer Wholesale) on the eye bolts under the car.  The right side plate will have to be trimmed to fit because of the routing of the fuel lines under the car.
harness2.jpg (10714 bytes)

Stock seat belt anchor bolt replaced with Racer Wholesale eye bolt

harness3.jpg (11520 bytes)

Same thing on other side, note stock seat belt is still in use

Crotch strap install

Follow the instructions that come with your harness for the correct placement of the crotch anchor--it's farther aft than you would think. I installed mine with the seat installed by measuring where I wanted the eye bolt, then drilled from below. The hole is just outside the fuel line channel. I used a knife to cut the carpet under the seat and pressed the eyebolt down through the hole and put on the washer and nut, there isn't enough room for a backing plate. Be careful where you drill, the fuel lines run right under the driver seat in a channel that sticks down about 1/2 inch. If you are going to drill from inside the car drill a small pilot hole in case you mismeasure. Be sure to apply some primer to the new hole to prevent rust.

Shoulder harness install

Simpson sells two lengths of shoulder harnesses, you should get the longer one. I followed Steve Cirian's Racing Harness Installation instructions and took this picture (below) of the eye bolt placement. It is about 1/2 inch to the right of the stud and about 1/8 inch forward of it (which is different from Steve's How To). If I had placed it where he suggested the backing plate from Racer Wholesale (Racer Wholesale 1998 Web Site) wouldn't have fit.
Realize that there are FUEL LINES DIRECTLY BELOW where you have to drill, so be careful. Drill a 1/8 inch pilot hole in the location shown in the picture. Put a flashlight over the hole and slide under the car to see where the hole is. Loosen the fuel line hold down bolt (10mm) nearest the hole so you can move the fuel lines a little to slide the backing plate into position. Verify the hole in the backing plate matches up with the pilot hole and finish drilling the hole to the proper size. Put some Lock-Tite on the eye bolt threads and put it in the hole. Have someone hold it with a large wrench while you slide under the car and put the eye bolt nut on with a ratchet wrench.
I used a screw-lock chain link from the local ACE Hardware store to attach the belts (lower photo). Since the photos were taken I have rotated the eye bolt 90 degrees so the harness hangs better.
eye_hook.gif (116661 bytes)

Harness eyebolt under the rear deck rug

interior3.jpg (24486 bytes)

The finished product

   Rob Robinette
 

 Home ] Up ] Engine How To's ] Reliability Mods ] RX-7 Notes ] RX-7 Glossary ] Modification Pros & Cons ] My RX-7 ] Brake - Big Brake Install ] Brake Line Replacement ] Brake Proportioning Valve Install ] Brake 929 Master Cylinder Install ] Brake Line Flaring ] Brake Bleeding ] Brake Master Cylinder Bleeding ] Shocks & Springs Install ] Antiroll Bar Bushing Upgrade ] Gauge Install ] Short Shifter ] Antenna Replacement ] Turbo Timer Install ] [ Racing Harness Install ] Racing Seat Install ] Hand Grip Repair ] Raise Rear View Mirror ] Fog Light Install ] Daytime Running Lights ] Safety Wire ] Polish Aluminum ] Repair Door Lock ] Trailer and Hitch ] Buy a Used RX-7 ] Other How To's ] More Hints and How Tos ]