I'm trying to pass tech to 200mph at ECTA in my (soon-to-be turbo-LSx) 240z. I have tried to fit racing seats with shoulder bolsters into the car in the past, and due to the narrow confines of the car, I would wind up chopping a store-bought seat up in order to get it in the car.
So, I'm trying to modify a Kirkey Intermediate Drag seat in order to pass tech (and protect my head!) with a completely bolt-on head bolster. ECTA rule book requires lateral helmet restraint over 175mph, but does not describe the specifics of how that must be accomplished. I don't want to use a funny-car cage, because I plan to return this car to road course duty after going 200mph in the standing mile.
Attached are some pictures of a preliminary cardboard mock-up of a home-made head bolster. I still need to make lower gussets, which will be angled up and forward from tabs on main hoop of the cage in order to provide both lateral stiffness and vertical load stiffness. The upper gusset will attach to tabs on the cage as well.
Questions:
1. Is the head bolster high enough? (I hope so, because a gusset on my main hoop makes going any higher difficult)
2. The back of my helmet is 3 inches away from the headrest in my driving position. How long does each leg of the bolster need to be, relative to my helmet? (I have made them 16.5" on each side, hoping I can cut them down some-getting in and out around this thing is gonna be a challenge!)
3. Why are there no ECTA or SCTA bail-out drill videos on youtube?
Keith