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Adjustable Seat Mounts

2K views 4 replies 4 participants last post by  M Loyd aka Ovalnut 
#1 ·
Has anyone had any inspection trouble running adjustable seats in a "fast" car. I would like to bolt a set of these seat sliders under my Kirkey driver and passenger seats, and have the sliders bolted to my cross bars going from the door sill bar to the tunnel: http://www.summitracing.com/parts/SUM-G1153/

The 2012 NHRA Rule Book says the following; I believe the Section that I have highlighted in red makes this idea not legal:

The driver’s seat of any car in competition must be constructed,
braced, mounted, and upholstered to provide full back and shoulder
support. The driver’s seat must be supported on the bottom and
back by the frame or crossmember. Except as noted in SFI
Specifications, seats must be bolted with four bolts (and nuts and
washers) on the bottom and one bolt in the rear into crossbar; all
bolts must go into frame or crossbraces.
Ball-lock pins for seat
attachment prohibited in all classes. All seats must be upholstered,
or as noted under Class or SFI Requirements. All front-engine,
open-bodied, supercharged or turbocharged (gasoline or methanol)
cars running 7.49 seconds and quicker must have a flameretardant-
material-upholstered seat.
Properly braced, framed, supported, and constructed seats of
aluminum, fiberglass, carbon fiber, or double-layer poly
(accessory seats) permitted. Single-layer fiberglass seats must
have steel tube framework, 1/2-inch-minimum O.D., for support.
Aftermarket aluminum seats must have reinforced head rest.
Magnesium seats prohibited.


Has anyone gotten away with anything like this? I have an idea in my head to still utilize a head rest support bar.
 
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#2 ·
How "fast" is your target e.t? I wouldn't think you'd get haggled at the lanes for a mid 11 sec car. If your putting a cage in it I'd do the weld in mounts and be done with it. How often do the seats get moved anyway? Fix the driver seat to your height/comfort and I'd set the passenger either equal or just a little bit back for a larger passenger.
just my .02
 
#3 ·
I realize the ultimate in safety would be to mount it exactly how I have it now, solidly mounted to 4 tabs on the cross braces. Just curious if anyone else has done it. Thought it was a cool idea and as long as you had a SOLID design for the seat back support, I think it would still be quite safe even for high speed cars.
 
#4 ·
There are NHRA approved seat sliders, the difference in them is BOTH rails have to latch completely when the lever is released. Regular seat sliders only latch one rail, the other is free-sliding. Although I don't know what ET they are good down to, I haven't had any trouble in tech with mine in the years i've run them.

The seat has to be fastened to, or against the roll bar though, making the seat slider function rather moot.
 
#5 ·
The Lummus seat mounts bolt over the existing seat rails. You mount the seat by drilling 4 holes in the seat bottom. The seat frames have slots, allow about 2" travel forward/backward. They come with mounts that bolt to the seat, behind the head. There's a sleeve you mount to the roll cage crossbar. There are slots in the collar and the shaft off the seat back. You can loosen that and the bolts to the base and scoot it forward or back then line up the bolt behind the head to tighten then tighten the seat base. No pix, sorry.
 
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