i forget the user but he brought up a good point that nothing is actually tested. With all of the salvage elises I see here and there and on eBay I wonder what the results were. I suspect most of the salvaged cars are from inexperienced drivers who get in over their head, not that it could happen to anyone.
I think I'm just going to go for it and make my slots and get the seats ready. I read 11 inches from the vertex of the seat back and seat bottom. how wide do you go and how thick do you make the holes (the dimensions of the cut, 6x1 maybe?) I have a momo supercup sitting in my garage for my miata, I guess I could see how the sub belt holes look on that
i was in the same position as you, intending to cut the seats.
fwiw heres my experience setting up harness and seats in exiges.
ive done this on two cars now.
ive learnt the hard way that its a heck of a lot easier, better and safer to not try and cut corners or diy too much when theres off the shelf stuff available. - maybe im just getting old and lazy
anyway fwiw heres what i did;
1st time i did it i fitted a v-force bar, it was a good height for me and couldnt pivot as much. i used it on stock seats. it was useless as the harness straps were held far too wide by the headrest. the stock seats were also useless with a hans. even my helmet was annoyingly touching the headrest all the time. i ended up using a rs rather than a hans and that helped keep my helmet off the rest. the other thing with stock seats was that they have no side support so i was literally falling out the seat on corners. all in all the stock seats were useless and quite unsafe. in the end i didnt bother cutting harness holes in the seatback or for an anti sub belt because of these problems with the stock seats i knew i wouldnt keep using them.
so i then decided to get an fia seat and after much searching and reasurance that the sparco revo Sparco Rev Seat
would fit. i bought 2 and figured id make the rails and sub harness bracket. what a nightmare. i had to bugger around cutting a few inches off the front of each seat then fabricate up the rails - the seats are a tight fit and dont go in easily at all. making the raiils and sub belt mounting was a pain in the ass. the seats looked great but are narrow. i have a 32 inch waist but after a short while the pressure from the sides of the seat becomes distracting. all in all quite uncomfortable.
with the v force harness bar and the revos it was a good set up for circuit providing reasonable side support and correct harness routing. also the rs worked well with the seats. never tried the hans.
ive just set up my current exige and this time it was a walk in the park! no buggering around cutting fiberglass, measuring and making fancy seat brackets. everything was plug and play and went in in about an hour. i learnt that sometimes it pays to spend the money and do it right rather than try to diy and bodge something to save some cash. yes i paid a tad more but man compared to the buggering around trying to make a silk purse from a sows ear it was money well spent.
for the last car i simply ordered a lotus sports seat and fitting kit from bell and colvin. Bell & Colvill About Us - Lotus Catalogue Detail
it went straight in it fits like a glove gives better side support than the revs yet is wider so i dont get my ass squeezed uncomfortably. its a far more comfortable seat than stock too
if i was to do it a 3rd time id do it this way again. ive got a safer more comfortable seat with good harness routing and safe anchors. a lot better than a less safe uncomfortable stock seat with poor harness routing and unsafe anchors which is what you could end up get with on a stock seat.
something i didnt appreciate the importance of before was side support. stock seats suck. its day and night compared to a good racing seat even if it wasnt for a harness id swap seats just to gain better side support i also figured that when i sell the car id just throw the stock seat back in and put the car back to stock so as not to put off some buyers
hope this helps - ymmv