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[Jan Suhr]

Can't that complicated to make your own bracket that fits perfectly to the car?

Or do they have to be approved by some authority?

[mandula]

Can't that complicated to make your own bracket that fits perfectly to the car?

Or do they have to be approved by some authority?

I think that is the safest way to buy premade, price is so low and it is just bolt-on basicly.

[Doctor Gollum]

Can't that complicated to make your own bracket that fits perfectly to the car?

Or do they have to be approved by some authority?

I suspect this, and that they're subjected to much more than a single static load test

[Omega Elite]

Anyone have the link to the ebay fitting kit for an Omega?

[Andy H]

Anyone have the link to the ebay fitting kit for an Omega?

I don't think there is one.

The Omega was never type approved for isofix mounts (as far as I know) so you won't get any help from Vauxhall.

Ford sell a retrofit isofix bracket for the focus. Search for Ford 1 357 238. This bracket is a simple symmetrical bracket with two sensibly placed mounting holes. The standard seat belt buckles are attached to the body somewhere behind the rear seat so there is definitely some solid structure there. Your task is to safely attach the Ford bracket to the body.......

https://www.ebay.co.uk/itm/ORIGINAL-Ford-ISOFIX-Halterung-Befestigung-Kindersitz-Focus-II-MK2-1357238/181671899904?hash=item2a4c7d3300:g:K3kAAOSwW8RbKKNz

[mandula]

Can't that complicated to make your own bracket that fits perfectly to the car?

Or do they have to be approved by some authority?

I suspect this, and that they're subjected to much more than a single static load test

Actually they not only make one, but they do two static load tests (with less load I'm intended to do):

6.6. Static test requirements.
(...)
6.6.4.2. Forces shall be applied to the static force application device (SFAD) in
forward and oblique directions according to Table 1.

Table 1
Directions of test forces
Forward 0° +- 5°
8 kN +- 0.25 kN

Oblique 75° +- 5° (to both sides of straight forward, or if
any worst case side, or if both side are symmetric,
only one side)
5 kN +- 0.25 kN

https://www.unece.org/fileadmin/DAM/trans/doc/2016/wp29grsp/GRSP-60-05e.pdf

Ok, I don't have that fancy static force application device (SFAD), but I'm sure my "test rig" will be good enough 

[Doctor Gollum]

2.22. "Static force application device (SFAD)" means a test fixture that engages the
vehicle ISOFIX anchorages systems and that is used to verify their strength
and the ability of the vehicle or seat structure to limit the rotation in a static
test. The test fixture for lower anchorages and top tethers is described in the
Figures 1 and 2 annex 9, as well as an SFADSL (Support Leg) to assess i-
Size seating positions with regard to the vehicle floor strength. An example
for such an SFADSL is given in Figure 3 of Annex 10."

It is tested in position in the vehicle as the test is as much of the vehicle structure as it is of the isofix attachment.

Ford will have designed the fitting point of the Focus chassis/floorpan to support the brackets in the same way as a manufacturer might design in the attachment points of a towbar.

[mandula]

Ok, I did some testing. Bolted brand new isofix anchor to IPE-beam, attached 1000 kg's to one unmodified loop and to modified=bent loop (one at a time as my "test rig" cannot lift 2000 kg's  ).

Result: no matter is the loop bent or not, it will not brake and it seems that they behave similar to each other. So it will handle at least 2000 kg/33  kg = 60,6 G-forces and I still believe it is safe to attach my childrens to it.

Here are some pics also:


Assembly to IPE-beam


Bent loop at front and unmodified at back


Test rig


1000 kg's mass


Control lift with unmodified loop


And it is up


Unmodified loop after lift


Now with bent loop


And it is up also


Bent loop after lift


This is the only situation I want to see isofix anchor looking like this..


Same from side


Unmodified loop


Unmodified loop


Bent loop (that paint is peeling off, not metal cracking)


Bent loop (same here, only paint peeling off)

Edit. Resized some pics.

I did not have time to scrape those paints off, I might do that later to check is there any hidden cracks under the paint.

[dave the builder]

By the time you have all argued,tested and decided , the kids will have grown up and left home 

[mandula]

By the time you have all argued,tested and decided , the kids will have grown up and left home 

Not at all, they have been happily sitting in the car 

And this is part of the hobby 

[Doctor Gollum]

That's not a dynamic load test... also that beam is alot thicker than the Omega floor pan
Both Ford and Opel suggested consulting the local dealership for advice, which was somewhat more positive than I had expected.

As I said before, they're not my kids... 

[mandula]

This was not testing floor pan, only does bending the loops cause any harm. It does not.
Also back seats act also as attachment, they are press fitted over anchors so they would not move forward even if I take the bolts out.

What is the difference between dynamic test where peak value would be 2000 kg's mass vs static test with mass of 2000 kg's?

Btw, here is your original worry. Nothing to do with floor pan 

"Agreed with the principle of the idea, but question the integrity of the attachment points following bending in a vice..."

[Doctor Gollum]

That may have been the first concern that sprung to mind, but it is far from the only consideration 

I hope you never find out whether they will hold up in a serious impact.

BTW, what did your insurers say on the subject?

[mandula]

I did not ask insurers, I dont know why should I. Would it prevent any crashes?

It is enough that those will hold far more than they normally be tested. And they are safer than only with belt hold seats for 0-2yrs.

[Doctor Gollum]

If something serious happens and your car is inspected, the authorities will know that the Omega B was never offered with ISOFIX. Your insurers will wash their hands of any claim as a) it is an un declared modification, and b) is a retrofitted safety device that the car structure was never designed to secure.

But, it's your kids...

Some food for thought...

https://www.verywellfamily.com/is-latch-or-seatbelt-safer-for-car-seat-installation-4135880