My Lotus seats don't really have any thigh support so I need to brace myself against the car using my knees through "the twisty-stuff".
I found too that the front low thigh ridges of the seat tend to cut diagonally across my hamstrings.
If I drove the car more I'd probably get used to it but after DD my comfy SP23 seats I decided I really wanted better - I'm at the extreme limit of the Lotus seats and not getting any smaller so I needed an alternative.
Lotus owners tend to upgrade to Tillett seats because they have better thigh support so that's what I figured I needed but the Tillett B5 was probably going to be too small.
Tillett recently released the B8 seat which they describe as an XL version of the B5 seat.
I looked at the specs and figured that I would fit into these seats and took a risk by ordering two of them from Demon Tweeks in the UK to save on S&H (I hate the look of mis-matched seats).
The seats took 8 weeks to manufacture/deliver and arrived this week via UPS.
I had to pay Import Duty which UPS took care of for a ~A$10 fee and both seats arrived well-packed in a single box.
The seats are incredibly light so ordering two at once was definitely the correct decision.
I'd previously bought Mazda NA/NB Bride Lowmax seat mounts from Nengun Performance in Japan because, based on what I'd read on the forums, they accomodate just about any side-mounted seat and they're specific to the car so the seats are guaranteed to be angled correctly.
The Bride Lowmax mount has a slider and the side brackets that bolt to it provide 3x front and 3x mount points to angle the seat.
The side mounts also have a mount point for the OEM seatbelt.
Tillett's site doesn't give any advice on brackets for an MX5 so I wasn't going to risk paying for any that may not work and they're bloody expensive.
Getting a mod-plate for these seats+brackets should be trivial.
I don't like the look of carbon fibre so I ordered the slightly cheaper FRP seats which have a slick black finish.
The seats come with a thin headpad embroided with the Tillett logo.
You can also purchase a seat and backpad (see bottom left of picture above) but for ~A$300 per set I figured I can something made locally for that price.
The seats themselves are very comfortable but even Tillet recommend some padding for DD.
Comparison vs Lotus seats:
Mounted photos (using the middle of 3x rear side mounts and lowest of the 3x front mounnts - originally used lowest on front and rear but that reclined me too much).
The yellow circles in the photos below show how close the seat gets to the seatbelt mount rail (mine is worn from previos seats).
At its furthest-rear position, the seat sits ~ 10mm in front of it.
The orange circle shows that the seat is centred on the steering wheel (which wasn't quite straight when I took the photos).
There's quite a lot of space on the right of the seat and the left side does not touch the transmission tunnel anywhere, even the fromt has ~10mm of clearance.
The OEM seatbelt mounts to the Bride Lowmax side-mount.
There's plenty of thigh support and they hold you well so they'll make a decent track seat but being deep with high thigh support makes getting in and out of them harder so just as well it's NOT a DD!
During the week I bought a couple of gel+memory foam seat cushions, lumbar support and a couple of seat pads from Autobarn.
The memory foam lumbar support was too thick.
The gel+memory foam seat cushions were too thick so I cut one down to ~50% depth with an electric bread knife and it's MUCH better, I could drive long distances with this comfortably.
Tillet is correct in stating that you don't need much padding to make these seats more comfortable for DD.
The best one was the one I originally thought wasn't deep enough. It was too wide so I cut the edges off and it's quite comfortable:
I plan to get some custom+local padding, preferably similar to the following but in titanium grey of course with possibly a "Gina" custom emroided headrest:
Lachlan came over today to collect a few turbo brackets and wastegate actuators and got to check out the seats, which gave me the motivation to fit one, otherwise I'd have waited until I got the padding fitted.
Hopefully will get time tomorrow to post some of the other stuff I've been doing...