rollcage and seat fitting - MSA
Turbo Mini Forums

Hi guys, probably a lot daft questions but this is not something i want to chance on and want to do it right!
Just after some help/advice on regards to the blue book when fitting a cage, seats and harnesses. Initially I'm not going to be competing (probably hillclimbs/sprints) but I'm at the stage in the build where I'd like to future proof the car as much as i can.


The rollcage I'm fitting is bolt in and it also bolts together, where is the best place for the spreader plates to go...
weld on the inside?
weld on the outside?
or weld on both sides?
weld on inside and bolt through on the outside?



With the seats, i'm mounting directly to the floor, I've got 3mm counter plates on the inside and outside, do these need welding or bolting as i cant find anything, i was thinking of welding to be on the safe side. Also trying to figure out the 40 sq cm per mounting rule, is that 40cmx40cm? or the area for example like 4cmx10cm?

Thanks
James

Try this.

https://www.msauk.org/assets/2015msayearbook.pdf

For the cage - Weld spreader plates on the inside, then bolt in place.

For the seat - Bolting directly to the rear floor is acceptable, but a crap idea. The rear floor of a mini is a bit floppy and not designed to take the full weight of a seat. It will deform in normal use, never mind an accident.

I welded mounting bars across from the sill to the exhaust tunnel and mounted the seat to this.

Fastest 998 mini in the world? 13.05 1/4 mile 106mph

Thanks, I'll check the link out when I'm on the computer next, can't seem to open it on my phone for some reason.

Wil, sorry I should have said, it's not a mini. It's a gtm coupe, ideally I wanted to put bars across. But I needed as much headroom as possible, the only way I'll fit into it is with elise seats about 1mm off the floor.

Ah, well on a GTM, the floor is suitable to bolt straight to.

But look at the blue book on seat mounting, you need certain sized spreaders.

Fastest 998 mini in the world? 13.05 1/4 mile 106mph

yes i've found... 'The minimum area of contact between support, shell/chassis and
counterplate is 40 sq cm for each mounting point'
Am i right in understanding that as √40 so 6.4x6.4??

That's it.

Fastest 998 mini in the world? 13.05 1/4 mile 106mph