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Folks,
How do you attach the inboard lap harness to the car, by the transmission tunnel, with a side-mount shell seat? Do you reinforce/drill/tap the floor? Attach it to the side mount bracket? Or attach it to a separate E30 seat adapter, like VAC?
Thanks,
Alex
Mine is attached to the steel seat mount I bought from CDOC. The seat mount is very securely bolted to the floor with longer bolts and large backing washers.
I wouldn’t use the stock seat attachment points without some real backing washers and nuts.
Ric
I bought the harness-ready eyebolts and steel plate kit from Racer Wholesale. Do NOT use hardware store eyebolts.
Carter
Chris Schimmel ended up welding eyebolts w/reinforcement plated into my floorpan for the harness install – the inboard lap attachment is just slightly above the middle of the curve in the joint between the footwell and the transmission hump side.
He said that it would be much stonger than simply bolting them through the floorpan.
Does anyone have photos of their inboard harness mount? I am going to be installing my harness’s soon…
I put some pics up here:
http://www.pbase.com/victorhall/cagebuild&page=5
-Vic
SO #325
FYI - it was a b1tch to install. I drilled a hole big enough to fit a nut into. Then welded a plate with a nut welded on the back onto the tranny tunnel - this took a lot of banging, and cussing. The MIG helped - as opposed to most of the rest of the cage, which is TIG’d.
I then threaded my eye-bolt into the nut/plate assembly. it’s a tight fit on the backside, as the driveshaft, heat shields, and other junk is not far behind.
Good luck!
-Vic
That’s exactly what I needed, thanks! The positioning is very close to where I drilled my pilot hole. I don’t have any heat shields under the car so I may have an easier time of it.
Walter
In the process of doing harness mounting…
For immediate application, the car will be hpde-only.
Will the 20mm eyebolts from racer wholesale provide enough thread to work with, or will I need the 50mm eyebolts? I’m planning on using the 4"x4" reinforcement plates as well, so I’m concerned that the 20mm bolts will be too short.
Is the large washer supplied with the 50mm kit sufficient for reinforcement, foregoing the 4x4 plate altogether?
Thanks in advance!
-Callahan
Bringing this one back from the dead, as I need an opinion.
I’m not sure what height to mount the inboard hook. I have a 4 door, and the outboard mount is at a fairly high level compared to most cars I’ve worked on, see photo:
http://mongrelmotorsports.homestead.com/files/beltmt2.JPG
I’ve got essentially two spots I can mount the hook on the inboard side, marked with tape in this photo:
http://mongrelmotorsports.homestead.com/files/beltmt1.JPG
I’ve read numerous instructions on proper angles and am now so confused as to what is right, proper or better I’m afraid to do anything.
BTW, that’s the anti-sub belt mount poking downward in the first pick, not the lap belt. The lap belt points up as it should. Any problem with the sub belt taking that angle?
Awaiting intelligent replies to begin drilling…
My outboard mount was to the floor. The extra hole from the seat mount is the right thread for the eye bolts you get for clip in connections.
On the inboard side I weled a plate with a nut on the under side of the car at about where your lower mark is. Maybe a little lower even. I then thread the eye bolt from the top with a washer.
After looking at your pictures again, I don’t think you can mount the outboard harness the way you have it. The bolt in type must not be subject to a moment force (rotational), only a tention force. Not sure that would pass tech from the inspectors that tech my car. I have only seen that type of conncetion used when a tab is welded to a cage and then the bracket bolted to the tab.
Michael O.
I agree with mike on you outboard connection being correct.
I too have a foor door and when mounting my Sparco it left a small area in which too mount the harness. I used the floor mount hardware supplied by WWW.Winecountrymotorsports.com it worked well.
I will paint shop(due to my abilities)your photo and show you where i drilled and mounted my eye bolts. 
ilateapex wrote:
[quote]
After looking at your pictures again, I don’t think you can mount the outboard harness the way you have it. The bolt in type must not be subject to a moment force (rotational), only a tention force. Not sure that would pass tech from the inspectors that tech my car. I have only seen that type of connection used when a tab is welded to a cage and then the bracket bolted to the tab.[/quote]
Are you talking about the sub belt mount, or the whole thing? I can’t use the ‘spare’ seat mount hole on the outside as the rocker bar for the cage passes right over it. Also, I’m not sure if you could tell or not but I’m not using the eyebolt mount on the outside for the lap belt as the cage builder didn’t allow clearance to thread in anything other than a bolt to the B pillar location.
I didn’t think about a floor mount. The trans tunnel where that lower piece of tape is happens to be double wall there, so it’s far stronger than the floorpan.
Motormuncher, you confuse me further by agreeing with Mike but he says I did it wrong. :huh:
Every situation is different and without sitting in the seat and seeing how the routing and angles of the belts are it is hard to say what is rigth and what is wrong. I would be concerned about the outboard mounting. It seems too high and at a bad angle. The best place for the inboard mount is at the bend where the tranny tunnel and floor pan come together.
Good Luck,
Michael O.
I agree that it looks incorrect in your photo.
I was able to use the eye bolt system through the floor with success.
I sandwiched mine between the floor and seat bracket at the oem attaching points, I’ve done the same in my other two vehicles, and felt very secure.
Well, the more research I do the more confused I get.
http://www.schroth.com/installation-instructions/en/index.html
Reading this, it would seem that a mounting point behind the physical seat would be undesirable.
I would love to see photos of some other mountings. I won’t be able to get to any events in the next month to study other cars though.
I emailed the Mid-Atlantic tech person asking for some help but haven’t received a reply.
text on pg 20 and the pictures on pg 21 and 24 look pretty descriptive of where the mounting points should be. If you are considering racing with BMW CR, they mandate that the belt angles be as shown in those pics (their App B rules took pics from the schroth manual)
cheers,
bruce
