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Old 12-06-2006, 09:28 AM   #1 (permalink)
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4 point harnesses

ok well I am wanting to buy 4 point harnesses for my 1990 zx and I don't know what I need to install them... any help?
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Old 12-06-2006, 06:51 PM   #2 (permalink)
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just for your info.....some Ferrari's come to the USA with 5 point racing harnesses and have to be retro fitted to 3 point lap belts in order to be sold as "safe"......thanks government .....xoxoxoo
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Old 12-06-2006, 07:22 PM   #3 (permalink)
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Quote:
Originally Posted by ketia
ok well I am wanting to buy 4 point harnesses for my 1990 zx and I don't know what I need to install them... any help?
Do you have a roll cage? Stock seats? Need more info, please.

http://www.my330i.com/mod12.php

Last edited by Willravel; 12-06-2006 at 07:23 PM.. Reason: Automerged Doublepost
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Old 12-06-2006, 08:44 PM   #4 (permalink)
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Quote:
Originally Posted by ketia
ok well I am wanting to buy 4 point harnesses for my 1990 zx and I don't know what I need to install them... any help?
Can I ask why you need a 4 point harness?

Are you racing it competitively where the inspections require it?
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Old 12-06-2006, 09:00 PM   #5 (permalink)
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Quote:
Originally Posted by Borla
Can I ask why you need a 4 point harness?

Are you racing it competitively where the inspections require it?
I'm more worried about people who want to mess with their suspension or add a turbo or something. A 4 point harness is a valuable safety feature, and is easy to install and is basically idiot proof.

Whether this person is racing competitively or is installing it for inspection, it'll need to work correctly. I'm up for helping with that.
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Old 12-07-2006, 05:42 AM   #6 (permalink)
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I personally would never use a 4 point harness. you are better off with your factory 3 point harness. The reason for this is load distribution. A 3 point is better at locating the restraint forces to parts of the body that are capable of withstanding an impact. If you want more then the factory 3 point get a 5 point and be sure you use it properly. Even a 5 point will offer less protection then your 3 point if not installed and used properly.
the theory behind the 5 point and the reason for the crotch belt is not to keep you from slipping under the lap belt but to hold the lap belt down over your pelvis. your pelvis can withstand something like 1400lbs of force before sustaining injury while your abdomen can handle only a small fraction of that without serious injury. something like less then 100lbs. Please forgive me as I don't recall the exact figures there.
it is also not possible to properly use a 5 point with a stock seat. the crotch strap must come up through the seat as running it over the front of the seat would only pull the rest of your belts forward away from you.
Now, with that rant out of the way, the best way to mount a harness set would be to some form of structure meant to be used for that purpose, idealy your safety cage. most harness sets come with mounting tabs that can be bolted down. I prefer not to use them and instead wrap the webbing directly around my cage material. your Lap belts should be secured at a point behind you. Your shoulder belt mount MUST be level with the top of your shoulders. NO EXCEPTIONS mounting higher will result in not effectively restraining you and mounting lower will cause compression of your spine in an impact potentially causing paralysis. In all cases, a 5 point harness must be extremely tight to be of any practical use. If you can latch your belts they aren't tight enough. you must latch them and then tighten them to where breathing almost becomes uncomfortable if not a bit more then that.
Also worth noting is that after market harness systems are not DOT approved seat belts.
Also, A bit of background on me, I race cars on a circle track for fun with plenty of collisions and have rolled my cars several times. Thanks to my full nascar style roll cage and a properly used 5 point harness I have never been injured.
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Old 12-07-2006, 08:11 AM   #7 (permalink)
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Having been in a rally car that is going end over end I love 5-point seat belts, rollcages, and helmets! I do not see the point in having them in a daily driver though, because you are less likely to want to put the seat belt on appropriately if it takes 5 minutes to tighten all the straps so you are locked in.

If you are participating in races with SCCA you would want to call the safety inspector for your region to see how to properly mount the seatbelts. They will be the ones to determine if you can race or not and may as well get the info from the horse's mouth.

Give us more details, so we can better help you.
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Old 12-07-2006, 08:15 AM   #8 (permalink)
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Your first step is to install a roll cage. 4 and 5 point harnesses are deathtraps without roll cages. because if you flip the car, unless you can get the seatbelt unbuckled in time (which will not happen unless you're lucky enough to be in a slow roll) you have no way of leaning out of the way when the roof collapses. Unless you can lean to the side, the collapsing roof will break your neck (and other things).
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Old 12-07-2006, 09:59 PM   #9 (permalink)
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Plus also if you buy very elcheapo harness you'll cut yourself up really bad in an accident. Plus it sucks when your trying to check your blind spots while wearing a harness.
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Old 12-08-2006, 11:37 AM   #10 (permalink)
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Location: S.E. PA in U Sofa
Of course this applies to the track, not the street where you shouldn't be driving fast anyway. I find, and of course many others do too, that if I'm more tightly held in place in my seat and not sliding around as I'm pulling 3.5g turns I feel more comfortable driving faster and it actually improves lap times and my ability to do other things required while driving fast ....e.g. change the volume of my CD player, insert a new DVD movie, touch up my make-up, talk on cell phone, etc.

But since the car I drive at such track events is not really a fully prepped race car and I still mostly use it on the street, I didn't want to install roll bars/cages and multi-point belt systems. But I found that this accessory really helps the factory belts do a better job, I love this gadget: http://www.cg-lock.com

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