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Seat Bracket to Chassis/Cage Mount


Scott
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Working on fabricating my seat mount.  BCCR doesn't explicitly mention any requirement on size or shape (tube, angle, etc.) for the seat bracket to chassis/cage mount.  I assume there is some flexibility here?  As in, we don't necessarily have to use the same tube the cage is made of?

 

Thanks,
Scott

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You don't even need to use tube.  You don't need to attach it to the cage.

 

You could literally mount it to the stock location and it could pass tech.

 

Most people fabricate some type of floor support.  I would say most cars seat mount is NOT tied into the cage.

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Although, the preferred way (safety-wise) is to tie it to the cage.  Our seat shifted considerably when we had a minor accident into the tires and it was bolted to the floor with plates. My fear was that a significant rollover could possibly have caused the driver to come out of the belts if it was violent enough.

 

Current chassis has 1" square tube seat frame welded to the lower main hoop x-bar and driver sill bar with a single inboard post/leg welded to the floor to support the 4th corner.  Belts are also tied to the seat frame (not the floor).

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In our old rusty car I added two small bars from the seat mount to the cage, was very easy and at least gives some protection. In our new car we don't have it because everything is sturdy and nice. But we probably should add it, thanks for the reminder.

 

It just seems like you want the seat to follow the cage, what is the point of a cage if you are outside it?

 

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3 hours ago, Indysupra said:

We are not tied into the cage but I made my own large washers out of 1/8th plate. 

We have a very sturdy welded in seat back brace as well. I would not run a seat with out a sturdy back brace. The brace needs to not only provide protection in a forward/rearward impact but also a hit from the side. 

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Cage porn you asked for, cage porn you get. Lol

Here's a recent A Sedan Camaro I did. Seat mounting crossmembers were cut down 1" for a tall driver, and recapped with 1/8" plate. I also added another portion of 1/8" plate for the owner to install either 5 point or 6 point belts. The Schroth guide recommends a 10-20 degree forward angle for a 5 point, and a 10-20 degree rearward angle for a 6 point setup. 

 

 

image.jpeg

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Full 1.5" crossmembers with plated ends to sill and tunnel sides on a Datsun 510; per FIA RallyAmerica rules.

Lap belt mounts are also incorporated into the tube end plates on the sill and tunnel. 

 

large.image.jpeg.81f686b86bc7d52de41cee81122291bd.jpeglarge.image.jpeg.c4e5701195e1f0f392571847620502b4.jpeg

Edited by mcoppola
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Some of mine from the camaro on pg. 11 of the build thread (holy poop the photobucket links work!). Because of the deep "tub", I could not tie the front of it into the door bar like I wanted, BUT the door bar is tied into the sill, which I then did the front seat mount bar similar to what @mcoppola showed above, but my welds are def. not as pretty! 

 

 

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@pintodave it was great revisiting your build thread (which I followed the whole time you were building!)

Some great quality work there, and good examples of a well thought out cage and seat mounting system. 

There's a couple other nice chassis in some of the photos that have my curiosity peaked...

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13 hours ago, mcoppola said:

There's a couple other nice chassis in some of the photos that have my curiosity peaked...

 

Yes, in the back ground there is a Lefthander Mod, which we have since sold. It had been forever since it had been raced, I started going through it and cleaning it up, but then got realistic about where the heck we were going to actually race it. I hate to knock New Smyrna, but that's why we left in the first place - out of control rules and super low car count. You had guys showing up with SB2's in the Mod division, way out of our budget and not what the spirit of the class started as, coupled with 5-7 cars showing up makes for lame racing. So we ruled that out. Next closest asphalt track that gets decent car counts is 2+ hours away each direction. Sadly, it's just hard to justify the travel time for a regular Saturday night show. If you can't commit to 2-3 nights a month, it's hard to be competitive. If I can't show up "with a chance" I'd rather not play :) 

 

The car hanging from the rafters is an old GT1 chassis, when they actually were more like Late Models and not just pure factory-backed operations. My step dad and a couple of his friends ran around the S.E. from the late 70's into the late 80's. They ran in the 24 Hrs of Daytona a few times too. That particular chassis was slated to race the 24 but an upper a-arm broke coming off of Nascar T4 in practice and there was no way they could get it fixed in time. That was bodied as a 3rd gen Firebird, Ed (my step dad) is pretty handy with 'glass, they did all of the body panels in-house, wide body'd the fenders, etc. Unfortunately this is when the expenses started getting out of control in the GT division and they decided to quit running any pro-level stuff. Lots of cool stories though! I am not sure which year, but one year in the early 80's they finished 11th or 12th over all, so that is a cool accomplishment for a privateer. 

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28 minutes ago, Bremsen said:

Here’s how I did our seat mount.  I was wrong, it’s 1.25”,  I think it was leftover scrap.  We have a really short greenhouse and I’m over 6’ so I need to get the seat as low as possible.  Also had to notch the tunnel.

C65964B1-C70B-4BD0-914D-DBB71DD69290.jpeg

@Bremsen I like how you built the side mount tabs into your seat frame structure (square tube) rather than using the sometimes flimsy side brackets that are available. I'm sure it's stronger, stiffer, and saved a bit of height by placing the structure beside the seat, and dropping the seat down below the square tubing structure.

I did a Fiero like this, and also lowered the sheet metal pan to achieve the lowest mounting possible. 

Nice job, and thanks for sharing!

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1 hour ago, wvumtnbkr said:

I believe that is a Nissan center tunnel and floor.  That could totally be a pic of a 2nd gen rx7.  Weird that they are that close!  Even the big "support" structure in the back looks identical.

 

Yeh I know, I’ve seen some of your pics and swore it was a Nissan. It doesn’t stop there, firewall and engine bays are very similar looking  too.

 

Thanks @mcoppola.  The rear one also doubles as a gusset to the frame corner.  It’s solid to say the least.

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