How to install a point harness? - Mustang Evolution

Go Back   Mustang Evolution > Off Topic Forums > The Bar



Reply
 
Thread Tools Search this Thread
Please support our sponsors and let them know you heard about them here!
Old 03-17-2005, 10:01 PM   #1
Registered Member
Regular
 
Join Date: Jun 2003
Region: Iowa
Posts: 414
Send a message via AIM to Horse Send a message via Yahoo to Horse
How to install a point harness?

I'm trying to figure out how to install some bracketry that will be sturdy, but removable for the installation of a 4 point harness for racing autocross. There really isn't a decent forum for this, so I guess I'll post it here.

My original idea was to make a bracket that will bolt to the two bolts that hold the back of the driver's seat to the floorpan, but I don't think that those two connection points will be enough to prevent forward motion in case of hard braking or, god forbid, a crash. Then I thought of bolting a bracket to the seat bolts and then flop down the rear seat and make two more points to connect it to in the trunk, so i'd have two bars that ran up the back of the seat and were connected to the seat bolts and then another peice that ran from the top of those bars back to my connection points in the trunk. that seems problematic though because I think I might hit the gas tank when trying to drill the floor of the trunk, and I don't want to drop the tank.

Here's my last idea. How much weight are those seat anchors rated for? You know the ones that sit up on the rear dashboard and are covered by little plastic lids. I think that they are for baby seats. Do you think I could bolt something to that?

I'd REALLY like some input on this.

And, yes, I know a 4 point roll cage would make it easy, but that will change my class, and I don't want to do that.
Thanks.
__________________
4.2L , CAI, BBK 65MM throttle body, 30lb injectors, SSM ported intakes, FLEX 1/2" spacer, RPM big valve heads, Comp roller rockers and cam, ASP-underdrive pulley, GT rear swaybar, & Quad Shocks, Full MM Coilover conversion, 17" Grey Torque Thrust wheels, FMS Aluminum driveshaft 8.8 rear w/ 3.73 gears, Tri-Ax Shorthrow shifter & SPEC stage II clutch w/ aluminum flywheel
Horse is offline   Reply With Quote
Sponsored Links
Advertisement
 
Old 03-18-2005, 11:34 AM   #2
Legacy Member
Legacy
 
lowflyn's Avatar
 
Join Date: Aug 2003
Region: Mississippi
Posts: 19,890
Send a message via AIM to lowflyn
If you are wanting these to seriously hold, then don't just drill a hole in your floorboard to put them in, you need to tie them into the frame.
__________________
"I'm not driving too fast...just flying too low"
Mine:
-03 SB Cobra vert- 2552 of 5082 Born 02/25/03
Our's:
90 7up vert - new project-07 DSG Focus -DD
335
lowflyn is offline   Reply With Quote
Old 03-18-2005, 04:51 PM   #3
Legacy Member
Legacy
 
Monkey's Avatar
 
Join Date: Jun 2003
Posts: 1,286
4pt are bad. either stick with your stock 3pt or go to a 5pt setup. 4pts create an effect called Submarining. This is where the chest is restrained in the event of a wreck, rollever, etc. and the lap isnt. I have ridden in a car that had a 4pt harness and the camlock sat near my belly button. Your hips actually end up sliding toward the steering wheel and then you get stomach and abdominal lacerations due to the straps stopping your abdomin instead of your hips. You can get an anti-sub belt (5th point) and put it into your floor board so you don't need a new racing seat.

Eventhough I know you autoX and there is little danger of wrecking or rolling over, it does happen.

But, to answer your question. You want harnesses mounted in at most a 45* angle to the driver. The only real options for mounting would be these:
1) Between the back seat bottom and top. There are a couple bolts back there that could support the stress of shoulder harnesses and you can put the seat bottom back on to retain in your class. That is about a 45* angle.
2) The seatbelt things on the rear deck. Those are actually welded into the frame of the car. Those are your best bet. What's best about those is that you can buy harnesses designed to bolt up to those. They come with a little anchor bolt and you put it on those. Then there is, in effect, a seatbelt locking mechinism that connects that to the harness. That way, you can take the harness in and out with just unclasping the seatbelt lock.

#2 is how I would do it. Run the long shoulder harness straps (remember, has to be 3" to be legal in any type of race) to the rear anchor mounts and then the two lap belts to where the seatbelt normally resides.
__________________
**I have sigs turned off, so if you're asking for advice based on your mods, I can't see them**
Monkey is offline   Reply With Quote
Sponsored Links
Advertisement
 
Old 03-19-2005, 11:45 AM   #4
Moderator Emeritus
Legacy
Regular
 
SpectorV's Avatar
 
Join Date: May 2003
Region: Alabama
Posts: 26,049
Send a message via AIM to SpectorV
you should mound a bar across the back of your head rests to mount the top belts, so they are straight back from the top of your shoulders, Get a 5 pnt harness.
__________________
2003 Cobra Vert (Redfire) #3938 of 5082 @ 05/27/2003
472rwhp/493rwtq -Modification List - Dyno Sheet
2012 Mustang 3.7L M6 (Kona Blue)
2011 Ford Edge Sport (Red Metallic)
SpectorV is offline   Reply With Quote
Old 03-20-2005, 10:58 PM   #5
Registered Member
Regular
 
Join Date: Jun 2003
Region: Iowa
Posts: 414
Send a message via AIM to Horse Send a message via Yahoo to Horse
Why would they have to be 3"? My seat belts now aren't even quite 2".

Also, the submarining only happens if the lap belt is set too high, if you are wearing it right and it's mounted right, it should be no different than the lap belt on the existing 3 pt belt the car started with right?

I think what I've decided to do is to fab up a cage out of 1"X1 3/4" rectangular steel tube and bolt it in where the power seat rack is bolted to the floor, then run it back to the bolts under the rear seat, and run it up the back of the seat level with the back of the driver's seat. I'm then going to strap the top of it to the anchor mounts on the rear dash to help toughen it up even more... That ought to work.

Thanks for the ideas, they helped. I'll have to get some pics of it when it's done.
__________________
4.2L , CAI, BBK 65MM throttle body, 30lb injectors, SSM ported intakes, FLEX 1/2" spacer, RPM big valve heads, Comp roller rockers and cam, ASP-underdrive pulley, GT rear swaybar, & Quad Shocks, Full MM Coilover conversion, 17" Grey Torque Thrust wheels, FMS Aluminum driveshaft 8.8 rear w/ 3.73 gears, Tri-Ax Shorthrow shifter & SPEC stage II clutch w/ aluminum flywheel
Horse is offline   Reply With Quote
Old 03-20-2005, 11:11 PM   #6
Legacy Member
Legacy
 
Monkey's Avatar
 
Join Date: Jun 2003
Posts: 1,286
Quote:
Originally Posted by Horse
Why would they have to be 3"? My seat belts now aren't even quite 2".
"Three (3) inch lap and shoulder belts are the minimum standard required." from one of the local races here. It is jsut the rule. I can see the rule being because there are plenty of 2" belts on the market like on ebay and whatnot for the pair for under $30. Those offer no real safety issues and the racing community knows this. A real set of harnesses are gonna cost you over $100 for each one. minimum.

Quote:
Also, the submarining only happens if the lap belt is set too high, if you are wearing it right and it's mounted right, it should be no different than the lap belt on the existing 3 pt belt the car started with right?
No. It is just natural with 4pt harnesses. This is because when you tighten the shoulder straps, the locking mechanism moves up to your stomach area. Just normal physics. If you bolt the lap belts more forward, then you have no lap support and have even worse submarining effect. 4pts are fine for autoX. Just do not do any other racing with them. A 5pt is so much better. A 5pt harness system costs literally less than $10-20 more for each harness than a 4pt. People know they will have to buy the 4pt, and to pick up the anti-sub belt (5th point) is another ~$15. totally worth it.

Quote:
I think what I've decided to do is to fab up a cage out of 1"X1 3/4" rectangular steel tube and bolt it in where the power seat rack is bolted to the floor, then run it back to the bolts under the rear seat, and run it up the back of the seat level with the back of the driver's seat. I'm then going to strap the top of it to the anchor mounts on the rear dash to help toughen it up even more... That ought to work.

Thanks for the ideas, they helped. I'll have to get some pics of it when it's done.
You're basically talking about a harness bar. Just a bar that runs behind the front seatbelt about shoulder hight to attach the harnesses. Good design. Just please remember my reply about the 45* rule. Do not connect it at more than a 45* angle.

Oh, just another quick piece of advice. Harnesses are only good for 5yrs. They come with a date on them and they are good for 5yrs after that. After 5yrs, you have to replace them completly. They also fade and lose strength in the sun. So take them out when you are not going to be racing. Also, I would 100% always use the stock seatbelt for daily driving. The harnesses make it hard to see in any direction except straight forward and you cant reach the stereo very well, etc.
__________________
**I have sigs turned off, so if you're asking for advice based on your mods, I can't see them**
Monkey is offline   Reply With Quote
Reply

Lower Navigation
Go Back   Mustang Evolution > Off Topic Forums > The Bar

Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are On
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
5 point harness! fastmustangs1 Mustang Audio & Video 2 05-18-2005 07:05 PM
Point me in the right direction... Hoover Mustang Wheels & Tires 5 02-25-2005 07:56 PM
What's the point, honestly? Seph The Bar 8 09-17-2004 11:40 AM
Can someone point me where I can find.... Brent The Bar 8 11-06-2003 09:43 PM

» Like Us On Facebook



04:36 AM


Powered by vBulletin® Version 3.8.8
Copyright ©2000 - 2017, vBulletin Solutions, Inc.
Content Relevant URLs by vBSEO 3.6.0

MustangEvolution.com is in no way associated with or endorsed by Ford Motor Company.