4 Point harness mounting locations for stock seat
 

This looks kind of unsafe but I guess this is the quick and easy way that Japanese people do it. I would use this more for cosmetic purposes than actually use this setup on the road. Great for shows.

http://minkara.carview.co.jp/en/user...1214/note.aspx

http://cdn.mkimg.carview.co.jp/minka...t=42243bee62ec
http://cdn.mkimg.carview.co.jp/minka...t=42243bee62ec
http://cdn.mkimg.carview.co.jp/minka...t=42243bee62ec
http://cdn.mkimg.carview.co.jp/minka...t=42243bee62ec
http://cdn.mkimg.carview.co.jp/minka...t=42243bee62ec
http://cdn.mkimg.carview.co.jp/minka...t=42243bee62ec

Parked and/or show use is one thing, but don't use those while on the road as that is probably the most dangerous 4pt setup you can run

I'm sorry.... how is this a DIY?

No sane person would do something like this.

-alex

harnesses should NEVER be mounted like that.

How is that unsafe? I got a bunch of parts for my rallyx car and a harness just like this was with it all. All that is needed is the points for the clips to go into. This is how I was instructed it was meant to be installed. Think about it, the bolts holding the shoulder straps are designed to hold you back in an accident already. Also the ones under the rails are in a spot just as strong.

Probably just an auto-x car although these seats don't really need it as they hold you better then any other seat I have sat in.

Read the manufacturers install instructions, that will explain whats wrong. For starters the angle to the shoulder belts is far to steep. For another the lap belts should be mounted where the oem lap bet mounts.

a shoulder harness should always be mounted directly behind you, never to the floor. When you crash, those harnesses are just going to compress your back, rather than just hold your body in the seat.

A simple harness bar would do the job just fine
http://www.m5board.com/vbulletin/att...arness-bar.jpg

That setup is unsafe. I talked to reps at Schroth and Takeda and both of them said the car's geometry is not fit to mount shoulder belts to the rear seatbelt points so they will not be making quick fit style harnesses for our cars. They strongly urge wrapping harnesses around rollcages are properly made harness bars.

The lap belt should pointed outward, and the outside lapbelt should really be mounted to where the factory seatbelt is located.

I second everyone who says its really important to pay attention to manufacturers recommendations regarding harness angles, etc.

Dumbest thing I've read all year. :laughabove::bonk:

This DIY should come with a eulogy.

I asked a question and made a few points of what I saw. I was looking for an informed response.

A simple Google search tells you:
https://www.google.com/search?q=race...w=1280&bih=939

The reason why they only provide you with the harness is, much like purchasing a set of wheels, there's no way for the manufacturer to know what type of vehicle it is going in to.

As others have covered (but not explained), harness mounting requires you to have the proper angles to prevent compression. You need to be secured, but also protected in case of a bad wreck. That's why harness bars always end up really close to your shoulder level.

Furthermore, while it is possible to use a racing seat with stock seat belts, using a harness with stock seats isn't ideal and can be dangerous. From the original picture, the harness passes between the posts for the headrest... now imagine your neck there. In an accident where the harness compresses, imagine your neck pinched in that tight location.

The shoulder harness should go OVER your shoulders, not choking your neck. Even if the harness was mounted properly, the location of the belts isn't idea for comfort or safety reasons.

But... the biggest red flag is, WHY THE HELL IS THERE A CAR SEAT IN THE FRONT SEAT?

Just because they're in Japan doesn't make them geniuses. Plenty of idiots over there too.

-alex

Thank you.

I saw that part and did think of that scenario. The harness I have won't be going in my BRZ but my impreza which seems like it is a bit better setup for a harness. Now just to get a racing seat.

I have a question for you: what kind of harness do you have, and what is 1.8L of furry?