OGRacing

iTrader: (1)

humm i can't make a ms paint rendering. how can i explain this..

lets say you get into a crash like this.



the floor under your seat will buckle. and look kinda like this
i had a hard time finding a img of the floor itself, but you can see that it's deformed.








with an aluminum seat mounted to the thin sheet metal the aluminum will bend with the floor. so if it's collapsed your seat will collapse, trapping you inside, causing injury or death. FIA Fiberglass (and carbon) seats don't bend. they will stay rigid until they crack. when the floor deforms with a FIA seat they mounting points would crack first but not allow the seat itself to crush you.

aidandj

iTrader: (5)

<p>Ok that makes sense. The mounts are the failure point with a FIA seat, not the seat itself. The mounting points need to be quite a bit more rigid. Maybe I will play with some tubing this winter and see what I can come up with.</p>

OGRacing

iTrader: (1)

you got it!

aidandj

iTrader: (5)

<p>So I just need a stronger mounting bracket setup than I currently have. Shouldn't be an issue.</p>

OGRacing

iTrader: (1)

yea it's not too difficult for someone with fabrication skills to make the mount correct. it just can't be mounted the same way as a fia seat.

aidandj

iTrader: (5)

<p>I think I'm just going to have to cut out the front mount and replace it with some round tube. Then some tube going back to the rollbar too. Or tie it into some door bars.</p>

ericwh

iTrader: (1)

So I have had a 20° layback aluminum seat sitting on the floor, rear humps removed, for several years, and my helmet is basically touching the hardtop. Planning on getting a new seat this winter.

Has anyone every tried mounting a Mini Cup seat in a miata? It has a 50° layback.

I haven't seen anything between 20° and 50°, if anyone has, post it up. If 50° is going to be too much I guess I will try just tilting a 20° seat back more, but I don't want to end up looking at the sky.




It seems they mount them tilted back to get even more than 50°, but, perhaps keeping it flat or tilting it forward a few degrees might work in a miata?

ericwh

iTrader: (1)

Found a post that said 40° layback in this model seat was available.

aidandj

iTrader: (5)

<p>Put some spacers under the front of your current seat and raise it up to equal whatever layback you are looking at. Test drive, see if you like it.</p><p>Also, it looks like those lay your lower back down, and then bend up so you still are looking forward, interesting. I think I would run out of foot room if I had to lay farther back, but I have the same issue you do, head hitting hardtop.</p><p>I rode in a stock miata at the track with the soft top up. I had to sit with my head sideways the entire time.</p>

ericwh

iTrader: (1)

Yeah that's the benefit of a seat designed for the layback as opposed to tilting a 20° seat more than intended.

I actually have tons of leg room right now, just no headroom. I'll play around with it before I buy anything.

jpreston

iTrader: (4)

I measured the angle between the floor and the rear shelf to be roughly 113 degrees, so 23 degree layback. A 40-50 degree layback seat is going to have to be mounted pretty far forward to clear the top edge of the rear shelf, meaning your legs better be pretty short.

jpreston

iTrader: (4)

Kirkey's seat sizing guy says I have an unusually long torso, so I've struggled a lot with fitting comfortably into a caged miata. The problem I've found with all of the standard seats is that they keep the spine too straight, which forces my head into the roof with any angle or mounting location that gives enough leg room. If you take the seat out and just sit on the floor with your back against the rear shelf, a little bit of spine curve will get your head waaay lower without eating up leg room.

I've given up on using a standard seat. I'm going to custom make an aluminum shell that bolts to the rear shelf and to the harness bar, then do a bead seat insert inside that. I'll also have to make an aluminum leg-support wall on the left side to contain the insert, but the right side will just be molded to the trans tunnel.

ericwh

iTrader: (1)

Ultrashield doesn't have a drawing of it on their site. Kirkey is probably about the same... https://www.kirkeyracing.com/related...op-drawing.jpg

ericwh

iTrader: (1)

OGRacing

iTrader: (1)

^ lol.
If you guys are planing on running that much lay back remember you'll need a formula harness. otherwise your ********* will become pancakes in a incident.

tomiboy

iTrader: (3)

asmasm

iTrader: (1)

I am about to put a tillett b6f in my car. It is a 30 degree layback seat. Also, if you look very closely at the design (especially clear in the front images) it has been designed so the lowest point of the seat can still contact the floor while it is mounted on brackets with fasteners under the seats. Most race seats have relatively flat bottoms (when viewed form the front) so if your brackets go under the seat (along with fasteners) you will end up having to sit slightly higher.

jpreston

iTrader: (4)

Post pictures please. I've been interested in a B6F for a long time.

jpreston

iTrader: (4)

Does anyone have much experience with Bride seats? I ran across this picture on google last night.



I've never been a big fan of Bride seats, but the Maxis 3 and the Zieg 3 Type-R appear to have the recline and spine curve that I need. I'm just not sure if I'll fit at 6'1" 210lb 33 waist. Bride seats are known for being really small, but the Zieg dimensions look pretty comparable to a Recaro SPG, which I easily fit in. I fit fine in a 15" Ultrashield Spec Miata and could maybe even go down to a 14" without too much discomfort. I think I'll be ok in the hips but I'm not sure about the shoulders, especially if I decide to try a Maxis 3.

asmasm

iTrader: (1)

I just got a tillett b6f in the mail and I think it is going to work out really well for me. I haven't seen anyone else install one of these in a miata yet. The fabricator I am working with will be notching the transmission tunnel and reinforcing the floors, I should have it installed for real this fall when my 6 point bar is welded in.

This thing is super comfortable and it gets me really low. I measured myself at 6'3.75" last week. The shoulder openings fit me with enough room that I think I will be able to run a hans with a harness straps run at 0 degrees back to the harness bar. The internal width is very similar to my 15" kirkey seat with no cover.

I opted for the version with an outer carbon ply for vanity- The seat is mostly fiberglass.


The 30 degree layback angle gets me really really low. I also have the rear mounting humps cut out. This is my eye level:


Also, because the layback is built into the seat, my legs aren't being kicked up and I have a lot more leg and knee room.

Lastly, the seat mounting holes on the sides of the seat are not parallel with the floor (when viewed from the front). This means you have to use tillett's brackets or bend your own to the correct angle. A piece of 90 degree angle stock will not mount cleanly to the seat. I can't find my protractor right now but comparing the tillett bracket to a speedsquare it looks like they are about an 85 degree angle.