Robi - any pics/description of what you plan to do for fuel cell filler/bulkhead?

Thanks.

 

CT9A is completely different as the subframe is in 2 parts and the upper control arms, toe links, and trailing arms all attach directly to the chassis, not a sub frame. We use the rollover hoop to box/stiffen the tailing arm mount then if the car has a cell use a v brace to pick up the top of the aluminum subframe in the middle.

Robi

 

[QUOTE=KevinD;8014714]robis cage is a minimalist cage, meeting the NASA TT rules and essentially not much more.

if you read the rules you'll see all the bars he has are called out specifically. the cage i'm building in my car is nearly identical to robis as well, but only because i'm also doing a cage that meets the rules and only 2 tubes extra. also i'm not doing the X bars on the passenger side, i'm doing the nascar bars because i have a passenger seat. you will want to cut the rear seat back "V" section out in order to have the proper roll hoop supports to the rear strut towers, but even that can be done without cutting it out completely.
[QUOTE]

this cage meets NASA and SCCA W2W specs and NASA TT and Redline TA rules. Just the "minimums" but imo that is what rules are for what you cant see in the picts are the 24" of welds directly between the roll cage and the factory chassis without the need for a bunch of gussets because we fit the cage so tight to the structure.

Robi

 

well according to the nasa rule book you cant use gussets because tech has to visually inspect all welds 360 degrees around the tube.

We've got it all figured out now, we are just trimming the "V" section to accomodate the roll bars and gutting the doors. I got a strut tower bar for the rear so no tube goes their and we are doing nascar style on both doors.

It works out rather well, and keeps cost down so the shop can afford other stuff to do, like rewire all of the electrical, make tow hooks, fiberglass ect ect..

 

I've never read the NASA road racing rule book, but if that's true, that's one of the dumbest things I've ever heard. Take a look at cage design from the 90s and cage design from the last couple years. One of the major changes is the addition of gusset plates in many junctions around the cage.

For rally cars, NASA rally rules follow the FIA rules, so I guarantee that gussets are required on new builds.

FWIW, there are at least two types of gussets you can incorporate, plate & "taco." A plate gusset doesn't block the view of a tube getting welded all the way around, but a 'taco' gusset would make it impossible to inspect.

Dave