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?

My harness is a Megan Racing 4 point. Came with Simpson straps with the end to bolt onto the car. This harness was in a fully caged log booked car. Here is the link to it on their website: http://www.meganracing.com/product_d...d=620&catid=98
It will be for rallyx only.

The 1.8L of furry is a joke. Anyone who knows the ej18 engine put into mid 90s subarus should get it.

I think he's confused about your spelling of the word "fury".

"Furry" is...just...something else.

Hang on a sec, Megan Racing sells harnesses? I mean, a cheap exhaust is one thing but I don't think I would trust my life with any of their products.

It is labeled Megan Racing. From looking it over I don't see where anything was cheaply done. Nothing is fraying or lacking proper stitching. I work with harnesses for doing work aloft on ships so I know what proper harness design is. Only part that could be better is the buckle but it is probably stronger then the factory one. Also like I said, just for rallyx in my impreza. It won't see speeds over 35(on the speedo as wheels spin a lot at times). I like the feel of being held in a seat as compared to on it, which is part of the reason I bought a BRZ and not a WRX or STi. Those seats are wider.

Props to the OP for taking the criticism so well. Agreed with all the other folks that it looked a tad sketchy.

Hmmm... Just got a new Miller Multimatic 200 for the garage. I could probably make one of those and build more after setting up a jig this spring. Just need a tubing bender.

This isn't such a bad thing; I needed this as i want to do what some of the guys in the 86/brz car club here in aus have done. All it does is (once tightened up) holds you in the seat for every corner so it makes driving easier instead of sliding in the seat. BUT wear your stock seat belt with it in case of a crash because bolting it like this is not a good idea if you crash

Don't use harness like this. Ever.


FIA guide for harness set up

Noooo no no no no. Did you not read the thread? This is the WORST setup possible and waaaaaay more dangerous than the stock seatbelt. If you wear your stock belt it isn't going to help you at all with this thing on. This setup has the potential to SERIOUSLY injure you. DO NOT bolt it up this way and use it.

As stated earlier, for show is one thing, but the belts should not be used like this.

So if other people drove their cars off a cliff, would you do it too?

Tell me exactly how wearing both a stock seat belt AND a 4 point harness is a good thing?

-alex

I dont know anything about harness safety but has anyone looked at mounting the top belts of a harness to the child seat top mount above the back seats?

I'd be curious to know about this, too. Or are those too high up?

I'd also like to know the viability of mounting a schroth auto control to the same mounting point as the rear shoulder belts. If I were to have a harness in a street-driven car, the auto control 3 pt harness is what I'd want, to keep use of the backseats.

This. When I was shopping my for harness setup, the guys at HMS Motorsport, who are a Schroth importer, confirmed the shoulder belt geometry is too steep to be mounted to the rear seat area on our cars, and I needed a proper harness bar.

I ended up going with the Schroth Profi II ASM 4 point with the Agency Power harness bar.

This is how racing harnesses are suppose to be installed. http://lib.store.yahoo.net/lib/wesco...al-instruc.gif

The lower the anchor point of the shoulder belt is mounted, the less effective they are in a frontal crash.

I cable/zip tied the back of the harness into the baby anchors behind my seat so on impact they will snap and then the stock seat belt will grab me.

This setup for me is to hold me in for corners up until impact where, like I said, the zip ties/cable ties will snap which will then make the seat belt grab me

Sorry if hadn't specified earlier. I understand why not to bolt the harness in, it can cause the spine to snap due to the forces and anchor points if bolted in.

Side note: I miss judged a corner the other day on a cruise, and the zip/cable ties snapped and did exactly what I hoped (seatbelt grabbed me)