Project SC300 Road Racer: Part 28 – Getting Safer with Sabelt
two eye bolts on floor with side mount brackets visible
Here is what the final product looks like.

With the passenger side sorted, it was time to turn our attention to the driver side and to weld the seat frame into place.


view inside of car showing windshield covered with cardboard and dash covered with a heavy blanket
Since we were doing this in a car with equipment, protection was used.

Barry places cardboard inside the windshield and blankets on the dash and other bits to prevent any damage from grinding or welding. More blankets and cardboard were used in the back of the car.

Normally this type of work would be performed before the cage is even done, and probably without any glass in the car at all, and certainly not with a dashboard. So it’s nice to see Robinson Racing take the extra time and pay attention to detail enough with this step.


air grinder resting on vehicle floor and two seat mounts freshly ground
You can’t weld paint, or dirt, or anything but metal.

Make sure your surfaces are clean and bare.

I mean, I guess you can weld plastic but let’s not get too technical here.


seat frame with side mounts attached clamped to mounting rail on floor pan
The frame is placed back into position, measured several times, and then clamped into place to ensure it doesn’t move during welding.


man welding through roll cage being illuminated with blue welding arc
And then the welding.


  1. As usual, a very well written article. Thanks, Erik! There is a lot of good information here and I hope that your next update IS about that well-deserved track time. I do have a question, though. At the bottom of page 2, you mention that “The factory seat brackets had been cut and channeled to accommodate flat bar which then had threaded holes installed onto which the seat mount was attached.” So, was the newly installed seat and bracket attached to the old flat bar setup? If so, why didn’t you have Robinson remove the flat bar and do a full install by not using any previously fabricated components? Not to detract from the work done (which is awesome), just a curiosity. Thanks.

    1. @BANSFTC
      Yes, if you look at the last picture on page 2, those are the “original” mounts that were fabricated by the cage builder (different shop). It’s basically flat bar fabbed into the OEM seat mounts. On the middle of page 6 you can see that Barry ground the paint away to expose bare metal, and then welded his new square frame directly to the flat bar that was already there. So, the OEM seat mounts have flat bar welded to them, and then a square frame welded to that.

      Barry felt that the existing flat pieces were welded well enough into the chassis that they would be a suitable mounting point for the new frame. It would’ve been extra hours to chop all that stuff out.

      The other thing is that the OEM mounts are usually (!) safe enough for rollover and serious crashes in terms of being welded into the car. So, using them as a starting point can sometimes be easier because they are often flat in relation to a floor that is far from flat.

      If I was starting over from a bare tub today, Barry probably would’ve opted to make two bars going from the side rail to the tunnel all nice and welded in and then build the seat frame on top of that, but that’s quite a bit of extra work. You can see from the picture on the middle of page 6 that the floor of the driver side is not flat. So to make it work you end up having to start cutting things out of the floor pan and that gets ugly quick.

      I hope that clears it up!

  2. Fat-fingered my own name. I miss the previous format where we would log in.

    Yes, your reply does clear it up. I was thinking about the cross bars that you mentioned (side rail to tunnel), but your explanation makes it clear why it was done with the existing flat stock. Thanks for clarifying. Keep these articles coming! They’re great.

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