Skip to main content

Replies sorted oldest to newest

I asked him how he did it back when I dropped my car off back when I moved from NY to Utah. He said they mount a rod or bar across the firewall. That's probably what I'll do, but I was looking for alternatives.



My seats are taller than this, coming right up to the bottom of the trim strip.

image



The shoulder straps on these belts are, like, 8' long. I was thinking about just anchoring them to the floor behind the seat. Or running a bar between those two frame members and anchoring them to that  

image"

Attachments

Images (2)
  • image
  • image
Last edited by dlearl476

harness

Don't do that, the belts need to be mounted straight back from the top of your shoulders.

If you mount them to the floor, can you say spinal compression?

I ran the crotch belt through the seam in the seat bottom. My wife sewed it up.

I know crotch belts aren't comfortable, but they really keep you safe in an accident.

And why do they call them anti-submarine belts? It's not like you don't know the belt is in your CROTCH LOL!

Attachments

Images (1)
  • harness

Understood. I was thinking of anchoring the eye bolt in the floor and running the straps up through footmans loops just below the trim strip, backed by a full-width extrusion on the other side of the firewall.

image

My thinking being drilling 4 small holes the through the firewall would be less traumatic than cutting 4x3" slots. Mostly because that would expose the nylon straps to the oily/heat goodness that is my engine compartment.

Both my seats are right up against the firewall. The eye-bolt and clip is at least 3".  There's plenty of room for it on the floor.  Behind my seat, not so much.

Attachments

Images (1)
  • image

Agreed. Mounting shoulder belts to the floor and expecting a half-assed loop to carry the impact load is well, (put whatever word you want). I'll go with not smart.

The shoulder belts need to go straight back and be attached to something substantial, such as 1.5" or 1.75" DOM tubing welded to other frame members to take the load.

At 50-60 miles per hour, the g-force on you and the belts is quite high, on the order of 180 g. I'll bet those floor-mounted belts and firewall-mounted "footman loops" would rip right out.

The other part of that equation is WEARING them, every time you drive. Yeah, it takes a few extra seconds to attach 5 points, but they keep you safe.

I'm not convinced that 4 point belts will hold you, especially given the angle of the seat typical to Spyders.

https://www.omnicalculator.com...sics/car-crash-force

Last edited by DannyP

Not really half-assed loops, as you call them, especially if they are anchored across the firewall to spread the load, but your post made me realize another factor I'd overlooked: Nylon straps lose 1/2 their load rating with every bend.

The fail point would probably be the footman's loops tearing the straps, not the loops failing.

My biggest concern, something I realized after switching my Speedster screen for the lexan one, is that it's somewhat of a guillotine. A proper lap belt will keep my head from hitting that.

Last edited by dlearl476

Thanks Danny. Back when I was working, I had a rudimentary understanding of all this stuff, because I used to hang tons (literally) of speakers above people's heads. Not so much now.

OTOH, there's this.  When I started pondering, I got worried that, unlike most 3" lap belts, there wasn't a certification label on them anywhere.  But they were in the installation instructions  

image

As as for the suspension, it just as well. I realized it was a lot of work to reinvent the (rear) wheels. I'm going to go with SwayAway adjustable spring plates and a front sway bar. BTW, either you or Jimmy mentioned that a standard Beam sway bar won't work on a Spyder front end. Is that true?

Attachments

Images (1)
  • image
Last edited by dlearl476

Add Reply

Post Content
×
×
×
×
Link copied to your clipboard.
×
×