i was wondering how do you install the Sparco 6pt harness? and i dont have a rollcage. where would i mount it down to?

 

I heard that installing an aftermarket harness incorrectly, meaning not on a rollcage or a harness bar, could actually cause more harm to you if you get in a wreck than if you had the stock seatbelts. Anyways now that I pissed you off, I'm sure someone else will actually help with the info you needed.

 

If you have harnesses, driving without a cage isn't recommended. The reason behind that is if your car rolls over in the event of a crash, the roof can come down and crush you since the harnesses are holding you straight up and down in the seat. With the stock seat belt, it holds you in place but still allows for you to slump down, that way if something were to start forcing you in that direction you'd still be able to move.

There's also some argument about what happens to your spine when the harnesses are improperly bolted to the floor behind your seat. Whenever the car stops suddenly, your back gets compressed due to the angle of the belts. I'm not sure I agree with this in regards to 4 point harnesses, as your entire upper torso is being held in place, not just your shoulders.

 

thanks man. i just dont have the money now to get the rollcage.

 

In the least, you need a harness bar in the rear to mount the should straps to:

http://mahjik.homestead.com/files/FD...e/MVC-005F.JPG
http://mahjik.homestead.com/files/FD...e/MVC-018F.JPG

The angle of the shoulder straps is very important. Most harness manufactures don't allow more than a 30-40 degree swing (from above to below the shoulder height) for proper mounting.

Now, I have run a harness without a rollbar or cage. I don't recommend it to others, but its up to you to know your limits when doing something like that.

 

There aren't any harness bars for FC's out there that I've ever seen (DO NOT USE A REAR SHOCK TOWER BRACE!!!!). Also, mounting it there gives an acceptable angle, but the length of the straps is longer than ideal (ideally it's as short as possible, so right behind the seat).

 

Mahjik, maybe you can clear this up for me. When you mount straps to say, the bottom of your seat, why is that so dangerous? IIRC, I read something about your spine being compressed in the event of a front end collision, but I don't see how that happens since the belts at your shoulders aren't the only thing holding you in place, you also have the lap belts. For your spine to compress, you'd have to keep your shoulders in place while the rest of your lower body continues forward. In the case of a 4-point harness, your lower body is held in place by the lap belt, so how are you going to move enough to cause injury?

 

haha... dang...
where can i find a harness bar?

 

It's the force "resisting" your movement that is the problem. In the case of the shoulder straps being mounted on the floor behind the seat, the resisting force is basically down. When they are mounted properly, the resisting force is backwards. That's the issue.

As for as a 4 point, it is possible to side under the belts. In a crash, the belts will move some. With this movement, it's possible to slide underneath the belts. This is why 4pts aren't allow in competitive driving (i.e. race tracks). The 5 and/or 6th belts are designed to keep the whole harness in a central position to keep the driver (hopefully) safe.

 

Especially if they're used with seats with any significant padding on them 4 points can be quite dangerous. As you crash the seat cushion compresses and allows you to sink down and you can partially slide under the belts, this combined with the force on the shoulder belts pulling up on the middle of the lap belts means that the lap belt is now in your gut and can cause serious, if not fatal internal injurues in an otherwise survivable crash.

There's some good crash test videos of this on the Schroth site.

There are no harness bars for FC's. Get a 4 point roll bar (Autopower or Kirk Racing).

 

ohh i heard i could tie the harness to a rear struct bar...

 

Don't use a stock rear strut bar. They aren't made for that purpose. You might check to see if this guy will do a FC bar:

https://www.rx7club.com/3rd-generation-specific-1993-2002-16/engineering-better-harness-bar-warning-long%85-656852/

 

DO NOT USE A REAR SHOCK TOWER BRACE!!!! They're not designed to take those forces and WILL FAIL in a crash. Do it right or not at all.

 

dang sooo i must go with roll cage? ... so how points i need?

 

A 4pt rollbar is sufficient unless you plan on turning your car into a full fledged race car.

Contact Kirk Racing: http://www.kirkracing.com/

Keep in mind that while the part themselves aren't all that expensive, shipping will be.

 

you guys know how much one of those cost.

 

Probably around $275 for the 4pt, and then another $120 or so for shipping.

 

damn... thats expensive!

 

Try Autopower, I think they're in California, maybe you could pick it up and save on shipping. Shipping to a business will be cheaper too, or if you can pick it up from their warehouse maybe.

 

i know that a shop will do a 6 point cage for 600 bucks. i know a guy who knows a guy know can shoot a guy for me to get a 12 point setup for 600.............
but hey, friends, and the hands you shake.

peace

 

IMO, that's cheap. If that price is scaring you, then performance driving may not be your thing. Tracking your car is not cheap. If you aren't going to track your car, you have no need for a rollbar.

 

Since nobody else has asked the question yet...why are you putting a 6 point harness into your FC?

 

cause... i got a some harness i wanna put on into the FC but everyone is telling i gotta get a rollcage, because noone makes harness bars for FC

 

If your not doing anything to mandate the need for harness'es dont bother putting them in.

Do it right, or dont do it at all. Best advice already given in this thread.

 

haha