Harness / Roll Bar / Roll Cage

Apollyon12

Active member
I did a search and all I came up with was that some guy named Tucker and Alen Berry Race Cars are the only peole locally that build/install roll cages or roll bars. I am thinking about a few possiblities and I would like to pick somebodys brain about what the different race specs and what is required for them. I am fairly sure that I am never going to get into any actual racing, be it rally or road course, but being the type of person who likes to do things right the first time, I don't want to screw myself by doing something and then learn that it's nowhere near where it needs to be. I am well aware of what it will take to put a full cage in any vehicle, and the kind of commitment that will require.

My line of thinking is as follows:

1) I would really like to have a harness for AutoX. The stock one does work but can be uncomfortable and everybody who has one seems to like them.

2) Do I get just one for me or do I get two. I don't usually take a co-driver but there is always the possibility for it. If having one is cool, two is better, right?

3) The actual facts about safety . If the harness has too much of a downward angle (the numbers seem to differ depending on whom you listen to) you can have spinal compaction and other issues after a crash. Mounting on the floor behind the seat is out, and mounting to the back seat attachment points may still be a problem. (I can't seem to get a definite answer to this, and of course in a wagon there are no baby seat mounting points on the back deck like the sedan. Which begs the question: Could I attach something to the hold down points at the back of the trunk and run the strap over the back seat, thus changing the angle of the strap after my shoulders to something closer to horizontal.)

Also without a roll bar/cage, if you roll, the harness can keep you in an upright position and the weight of the car can crush you and the seat.

4) A harness bar attached to the upper belt mount on the pillar does not seem to fix the angle issue. In theory the belts still needs to go through the hole (or between the head rest bars) in the seat. So they might be at a downward angle for me but on somebody larger, the could still be an issue. This, of course, does not touch the roll-over issue.

5) So if I don't want to do a roll bar or full cage, the harness should ONLY be used on the AutoX course and NEVER on the street.

6) Whether I get one or two harnesses, I will probably be asked to use the stock harness during any training or instructors will not use the second harness. So there doesn't seem to be a whole lot of value to having a second harness except for the cool factor. "Passengers, you are on your own, the O-***** handle it right there."

7) Do I spend the money to get one of the Schroth Quick Fit ($225) or Quick Fit Pro ($325), which can be removed from the car (stealth) and used only on race days. Or do I get a couple cheaper ones like the Rallye belts ($150) which are permanent installs. (And somebody has a pair for sale on Ebay for cheap, reserve set at $150 for the pair) So in the end I get the same thing but I am paying another $75 for the ability to remove the harness and store it when I am not using it.

8) The other alternative, and the one that I need the most info on, would be to get or make a roll bar that would allow the functionality of the wagon to be maintained but have a mounting bar at the correct location for the harnesses as well as some roll-over protection. This would be the "Do-It-Right-The-First-Time" option. Perhaps one could still use the Quick Fit belts but I think a giant roll cage would remove the stealth elements. In any event, the point would be to use the right equipment in the right manner for the right job. Protecting you in all situations.

My guess would be that for a weekend warrior it is totally impractial to try to meet any race standard, but what I would like to know is whether it would in fact be possible to make a minimal roll bar that will do the job and be able to be added on to in the future if it became a total track car.

 
This all depends on you, are you mostly only going to be using this for auto/rally-x and the occasional track day, and how often do you have passengers in your back seat?

if you are using the car more as a DD and not as a track car i would not go with a full cage, the bar should suffice. If you are using your back seats i would say go for the removable one as it can be a safety hazard to anyone sitting in the back if you are in a collision during DD use.

 
roll bars and cages go in dedicated race cars, not daily drivers

any rollbar that is OK for DD use isn't legal for racing, and any cage legal for racing isn't OK for use by unhelmeted occupants.

sad to say, but you are chasing a pipe dream--a dream chased by many many others without success.

if u want 4- or 5-pt harnesses for autox or rallyx. go with removable harness bar.

 
I dont know if this helps but autopower has a nice selection of bolt in roll bars for fairly inexpensive. that's what im going with for mine.

 
roll bars and cages go in dedicated race cars, not daily drivers
any rollbar that is OK for DD use isn't legal for racing, and any cage legal for racing isn't OK for use by unhelmeted occupants.

sad to say, but you are chasing a pipe dream--a dream chased by many many others without success.
I hadn't thought about the helmet thing. that's a very good point. I realize that a full cage is going to make a car no longer a viable street car. I wasn't thinking about a full 8 or 10 point cage, I know that just not realistic.

if u want 4- or 5-pt harnesses for autox or rallyx. go with removable harness bar.
Like I said, I don't like the currently available harness bars because it forces you to still have a downward angle after the shoulders. Especially for a taller person. Even if you move the shoulder belt mounting point all the way to the top and go around the seat, not though it, maybe that would work but I still don't like it. I think the straps would be way out on your shoulders.

Is that statement incorrect or do you have a different opinion, Nigel?

 
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I dont know if this helps but autopower has a nice selection of bolt in roll bars for fairly inexpensive. that's what im going with for mine.
Is this the one that you are looking at?

streetsport_lg.jpg

That is along the same lines as what I was thinking. A bar above the head height, support bars from the trunk area going past the door high so that you can still get stuff in and out and a removable harness bar that is signifigently higher than your shoulders.

I am guessing that the pictured bar does not meet any race specs. Am I right in saying that this would also be a hazard to passengers in the back seat?

 
if u want 4- or 5-pt harnesses for autox or rallyx. go with removable harness bar.
What do you think of the idea of tethering the shoulder straps to the safety seat anchor in the trunk (of a wagon) and running the staps over the back seat. I think that would be an almost horizontal line to the driver. I was also thinking about looping the straps around the seat, as I said earlier, so as to not use the pass through in the seat, but I don't know how well it would work. For a tether, I was thinking a piece of chain with a couple loop clips. Quick and easy to remove and store away.

If I was going to do that, it would probably be for Autocross only and NOT for street use.

 
roll bars and cages go in dedicated race cars, not daily drivers
any rollbar that is OK for DD use isn't legal for racing, and any cage legal for racing isn't OK for use by unhelmeted occupants.

sad to say, but you are chasing a pipe dream--a dream chased by many many others without success.

if u want 4- or 5-pt harnesses for autox or rallyx. go with removable harness bar.
I agree with you 99.99%

the only point at which I disagree is when a small convertible is the car in question. and I punted my head off the bar in that car!

but that still beats the hell out of having a truck parked on the back of your head!

 
What do you think of the idea of tethering the shoulder straps to the safety seat anchor in the trunk (of a wagon) and running the staps over the back seat. I think that would be an almost horizontal line to the driver. I was also thinking about looping the straps around the seat, as I said earlier, so as to not use the pass through in the seat, but I don't know how well it would work. For a tether, I was thinking a piece of chain with a couple loop clips. Quick and easy to remove and store away.
If I was going to do that, it would probably be for Autocross only and NOT for street use.
woah...

No on both counts!

you definitely want some downward angle to the belts. If you do not have any downward angle your ass doesn't stay planted. if that happens you submarine AKA snap your neck on the waist belts.

the over the seat this is a recipe for death. as soon as the foam compresses you will move forward and you will hit the steering wheel.

there are some very good references if you look at the belt manufacturers or sanctioning body regulations. for instance try: SCCA, Rally America, FIA, NASA for rules regarding belts and placement.

and that roll bar is not suitable for a rear passenger. you would be best to just take the seat out so that someone isn't tempted to ever use it.

 
you definitely want some downward angle to the belts. If you do not have any downward angle your ass doesn't stay planted. if that happens you submarine AKA snap your neck on the waist belts.
I am not going to say you are wrong but I was watching a clip on the Schroth site of some of their crash tests and I would say that most of the belt configs had the shoulder straps going almost horizontal away from the seats. And some with a slight up angle.

SchrothASMII.wmv

Quick_Fit_Pro_Crash_Test.wmv

Crash_Test_With_and_Without_HANS.wmv

That being said, there is a reason I am asking your opinions. So the question really is: what is the acceptable angle range. Fastened on the floor (0 degrees) or roof (180 degrees) right behind the seat are obviously a no go.

On the other hand, I have a real problem with people who look at a product and say that it was made or designed wrong. Not you Pedro, I was kinda letting myself do it. I would assume that a hell of a lot of testing when into the design and a company is not going to sell something that will allow you to sue them if it injures you.

the over the seat this is a recipe for death. as soon as the foam compresses you will move forward and you will hit the steering wheel.
Good point. I guess doing this would be one of the examples of where someone took a properly designed product and red-neck engineered it so that it will work "correctly".

So once again, what is the acceptable angle off the shoulders, or maybe more correctly, from the seat pass-through. Do the Sparco harness bars have it? (properly engineered)? Do the Quick Fit's have it right?

At the moment I am really leaning towards the Quick Fit. If only it didn't cost $75 more than the permanent install ones.

 
OK.

I watched the first two vids. Here is my summary:

First video: This is a great example of what I was talking about with submarining on the non anti-sub setup the belts are mounted somewhere near 180* with this setup you can see that it does not keep you planted in the seat and lets your body slide under the lower belts. This causes SERIOUS injury.

However with the Schroth proprietary anti-sub system you do not compress the body into the seat, therefore in proper usage you will have less spinal compression. This is good. but I don't know if I would trust the system as it aged. and it is definitely not something I think anyone is using in racing.

Second Video: This one is a pretty standard setup. It appears that the belts are at ~ 150* I would estimate that this is the minimum angle that I would use for any belt. and you will notice that there is no pretension device on this belt like the earlier video. so this is a standard fixed belt with no special stuff attached.

Now if you want to get really technical. The seat angle influences that range that you were asking about. In formula cars the seat is reclined and the bottom of the seat points up quite a bit more than in street cars. When you have this setup the belt angle is typically (as per my recollection) at or closer to 180*. This is because the majority of the anti-sub will be taken care of by the seat bottom.

Now when you start looking for harnesses. I am a big fan of 5/6pt harnesses. These are the age old anti-sub belts that you will be required to use for many motorsport types. basically the fith and sixth points go between your legs and keep the waist belt from riding up. I have never had one damage any of the family goods, but I have also not crashed in one. They do keep the harnesses much more comfortable than normal.

another thing to think about is belt width. The street tuner belts are typically 2" belts. These can get old quick. they will really dig into you if you wear them tight. I like the 3" belts that I have in the miata. And since I am not running anything other than autoX with them this far, I snagged them from a rally team that had to upgrade due to belt age (yes belts have to be replaced when they get too old).

If you want to try some 3" belts let me know. I have them tucked behind the seats in the miata when I daily drive it.

Hope that answers some questions.
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Predro is 100% correct, you also want a removable bar like i said in my first post because the back of your drivers and passengers seat is designed to not only keep you in the car but take the impact of the person riding in the back, thus having a permanently mounted bar would create a serious safety hazard in the car.

installation1.gif


 
Now when you start looking for harnesses. I am a big fan of 5/6pt harnesses. These are the age old anti-sub belts that you will be required to use for many motorsport types. basically the fith and sixth points go between your legs and keep the waist belt from riding up. I have never had one damage any of the family goods, but I have also not crashed in one. They do keep the harnesses much more comfortable than normal.
At the point where you are required to have a 5/6 pt harness aren't you also required to have a cage or roll bar? Or are the two things separate?

What other brands are there besides Schroth and Sparco?

Does anybody make a 5 point that is removeable?

Is there any opinion on the ones with an inertia reel so that you can move around under normal conditions and lock it for racing? My though was that you are taking a low tech "bulletproof" system and adding in parts that can fail or brake just to make it more streetable when the harness probably shouldn't be used on the street anyway.

 
i drive daily with a schroth quick-fit harness. its comfortable, and i enjoy the anchored to the seat feeling. you dont need to bolt it in, as it clips righ into your existing harness, and its dot approved.

for what its worth, i think cusco makes a bolt in cage.... i dont know how much good that'll do ya. there are probly more local places that would make you a good one. try calling performance product painting over at the lewiston auburn airport. both times i have been in there, there have been some sick caged cars/ trucks in there. look like nascar deals n rock crawlers. they could probly send you in the right direction.

good luck!

 
Im getting the autopower race roll bar the one you posted is the street version which doesn't make much sense to me since you shouldnt have passengers back there at all. Plus the race looks a bit more rugged and its anchored in better spots.

 
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I agree with you 99.99%
the only point at which I disagree is when a small convertible is the car in question. and I punted my head off the bar in that car!

but that still beats the hell out of having a truck parked on the back of your head!
...or an inverted Miata planted on yer noggin
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100% no doubt, a roll bar DOES improve protection in a conwertible however the unhelmeted occupant thing still stands...you said it yourself, you roll-bar head-punter!
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a properly designed harness bar for a Suby sedan/cooupe manages the belt angle thing just fine...generally the bar bolts into upper anchors for front stock shoulder belts but hangs a bit lower on brackets, so the harness comes across top of front seats at a workable level and angle. many harness bars have guide rings for the harness shoulder belts to keep them properly located side to side.

go to rally-america.com and check out "rules & regs" area, you will find excellent illustrations of proper front harness belt angles

for autox or rallyx, harness for driver only is acceptable. if you want to do track days or driver ed on track, your instructor will want equal protection in front passenger seat. some instructors demand it, they won't ride with you otherwise.

When I'm teaching, if I get into a car that's all 'tracked out' and only has harness for driver, it sends a very bad signal "this guy only cares about himself"and I'll be sure to keep the guy on a very short leash.

 
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