#10
With the harness bars in i turned my attention to the seat subframe rails. I removed the original seat mounts as they were too far forward for where I wanted to put the seat. I also wanted them to meet the latest tech regs:
http://media.turbosport.co.uk/2008/2/2008021123198948975FIA253-65b.jpg
The FIA regs have changed now which means you have to bolt these rails to the sill and tunnel rather than weld them on. When people were welding them on as low as possible they were unable to weld underneath the rail (only 3 sides go welded) This way you can remove the rail and weld all the way round the ends, thus making a stronger connection. I suppose an additional bonus to this means that when I don't run the passenger seat I can remove the rails to save every last gram!
I welded some M8 top hat bosses into the original seat inner mount holes on the tunnel. I intend to use these to mount a frame i am fabricating which will house my brake bias valve, hydraulic handbrake.... drinks holder?? etc etc.
I bolted my OMP aluminium seat mounts to the drivers seat and sat it in the car to work out where abouts fore/aft i needed the rails to be located. I marked this with a paint pen and then began the laborious task of making all the plates and rail tubes as per the regs.
SILL PLATE - Welded on M8 nuts which will sit inside the sill onto which the rails will bolt.
HOLES DRILLED & AREA PREPED FOR WELDING
PLATE ON - Quick measure to check it was all ok
WELDED IN!
The next stage was the trickiest. As the tunnel is not a vertical flat surface like the sill, a bit more measuring and fabricating was required to create a flat surface that allowed the rail to bolt too.
This is what I came up with.. I aligned the main plate with the rail laterally and angled it so it matched the tunnel as best as possible. I kept the top edge aligned with the car in the longitudinal direction. I then tacked it in a couple of places before making 3 extra plates per side to fill in the gaps, creating a box structure (Should be nice and strong!!!)
BOTH SIDES DONE - (Easy as they were a mirror of the first side - I made sure i traced round the drivers side plates before I welded them in)
HAVING A QUICK LOOK AT PROGRESS :relieved:
Next job was to make the plates which would be welded to the box section and bolted to the sill/tunnel mounts. I measured up to make sure they were above the minimum surface area stated in the regs. I then bolted them in and sat the box section on ready for welding!
Lots of rulers and spirit levels were used at this point!.. I think I took "measure twice 'Weld' Once" to a new level!! After tacking and re measuring a million times they were fully welded in!
WELDS!! haha
REAR RAILS IN - Now to EAT, SLEEP, WELD, REPEAT for the front!! :unamused:
I'll leave you all with the fruits of my labor!. Proper chuffed with how they came out. All i need to do now is put the seats on and mark out the holes for the side mounts, get the rails drilled and weld in the M8 top hat bosses to mount the seat and it will be JOB DONE! (well one more job ticked off, still got the other 100 to go!)