I have an '89 RX7 and the front of my seat is mounted to the cross beam on the floor and then with spacers and bolts to the floor. The back is mounted to the cage with a angled piece of steel that bolts to the back of the seat and then ins u-clamped to the cage. It's a LaJoie seat with a halo. The seat is pretty massive and very safe.
That said, when I bought a Kirkey intermediate for my 2004 SPO stock car and mounted that I started to have doubts about how we mount our seats in IT cars. With the stockers you have to mount the seat to the cage via cage bars that run under the seat. That way if the cage moves you move with it and not get pinched or crushed by the cage. My seat is mounted in 10 locations, 4 on the seat, 4 at the crosstube at the back of the seat and two mounts that come off the cage at the headrest. Everyplace said don't mount a stocker seat to the floor.
In an IT car there's no way around it unless you make arrangements to have bars come off your cage when you build the cage or have somebody weld in some crosstubes afterwards. Also, IT cars have smaller cockpits - no head room for a big guy unless you mount to the floor.
Make sure you use aircraft level fasteners or grade 8. Also make sure that the moutning point below the floor has reinforcement or some pretty huge washers so your fasteners can't pull through.
I spent a whole day mounting the seat - pain in the 'arse' pun intended, but I know that it's as safe as can be.
Cheers,
BenSpeed
#33 ITR Porsche 968
BigSpeed Racing
2013 ITR Pro IT Champion
2014 NE Division ITR Champion
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