The guys at Autosportwerkz here..were telling me that people commonly attach the other harness parts to the rear seat belts, just like DistantTea said. They are a hardcore road course, and autocross dealer, they are a vendor for Recaro as well. I imagine their technique is sound.

-Bedlam

 

i currently use the weapon r 4 point harness in my lancer oz. they are not a full race harness as they do not attach in the center like most. but they do hold me in the seat when i autocross(which is the only time i use them). for attachment i have used the lower child seat bars that are in between the the upper and lower portion of the back seat. i did however have to get a oval shaped clasp(used for chains) that has a tensil strength of over 800 lbs so that the belt would not be twisted. and the lower lap parts is bolted right to the seat mount bolts. with these attachment points it gives me that correct geometry that is shown on the link with in this post.

 

Just a side note on harnesses here.
While in most cars, when you mount the shoulder straps to a point below where the top of you shoulders are you will compress your spine in the event of a collision, the EVO has Recaros with shoulder slots that act as another tension point. In essence, the shoulder straps are "mounted" to the level of those holes as far as mounting angle is concerned.
I have used Sparcos in my EVO8 on the street (soon to swap with Takatas) and never had any problems with "speed bumps" and the sort. I intentionally tried to be as violent as I could with jerking forward just to test if the straps seem to press down at all. It did not seem to be a problem although that is not a 100% test by any stretch of the imagination. If you are tall enough to exceed the height of those seat holes or get pretty close, then you will need a cage.
BTW, my EVO has not rear seats or belts so you can mount the straps to the factory rear seat belt shoulder mounting points. The Sparco belts I have played with so far come with identical bolt size and threading so you screw right in. Otherwise, you will need a mounting plate welded to the backside of any other hole aside from factory mounting points. The lap belts will bolt in with the factory belts.

Mark
www.Quantum-Racing.com

 

i installed my 5 point harness to the existing seat belts in the back seat....not to the seat itself because they said it would be dangerous....but it all depends on what you call dangerous.....I'm not going for the racing thing, so i installed them for looks....thats just my thing....don't hate guys.....

 

Can you post some pictures. Is your hardness a snap-in or bolt in.

One funny thing about the 'harness haters" is how many factory performance cars come with 4-point harnesses and no rollcage. I guess companies like Porsche, Ferrari, Dodge, etc. just want to decapitate their customers. Of course they are in on the whole cover up with Simpson, Sparco/Sabelt, Schroth, etc. Yeah, and then the FIA, TUV and DOT approve them just for fun. Anyway each to their own...

 

4/5 points in a car are like cigarette smoking, you have the right to kill yourself so long as you don't take anyone with you. Do it for looks or whatever, fine, but hopefully whoever is riding with you has a clue of potential risks if you put em on both seats.

For autocrossers the harnesses are nice to hold you in one spot, but a rollbar is highly recommended. Also, SCCA rules state that you cannot remove the stock seatbelts when you install a harness, to allow the option of wearing either.

 

Right on the money. There are certain race clubs out there that will let cars on the track w/o a roll cage with 5pt harnesses. This is a death wish if the car should roll (I have seen my fair share of cars at tracks roll. Happens just about every race weekend.) People think 5pt harnesses are safe by themselves and they are not.

 

I'd expect it somewhat depends on what the particular car will do when set on it's top under it's own weight. Obviously some cars are better than others when it comes to that situation.
I have a hard time believing that some sports cars that come with 4 pt harnesses pre-installed would crush like a pop can when set on it's top. Too much liability on that one.

Mark
www.Quantum-Racing.com

 

To each his own really, you all know the risk involved of you use them, etc.
Interesting point is if you have it straight back to the seatbelt mount hole, I guessing the shoulder belt towards each side of the car. What will happen if the car is in an accident and say the contact is at the rear door like a couple that have been posted.
The belt is going to be pushed towards the center and shorten up on the driver, not going to feel good.

I don't really see an issue for show, but I wouldn't wear them on the street. Autocross I can somewhat understand with the way you are mounting them up as high as possible. In theory you can roll but it is not that common.

My first car I had a 4pt. in the car that I got free and had no seatbelts in the car so it was better then nothing. I summarily hit a telephone pole at about 55 miles an hour headon while sliding sideways. I definetly did not move during the accident and was not hurt. So I can say they worked for me in that instance but I have not had them in anything since and understand the possible dangers. Just the lap belt alone though is not dangerous and can be adjusted to keep you butt planted in the seat which is half the battle if not more.

It's knid of relative to Kart racing. They turn over a lot and there for seatbelts are not allowed because they would rather you fall out of the Kart then break your neck when you flip. That is even with a required neck brace. I never did turn over when I was racing which I guess is good since helmets aren't cheap.