Full Length Tube Frame

I gotta tell ya, that has got to be one of the weirdest ambitions I've seen so far yet to date.

3" Dom? What ever for?
There are complete prebent round tube kits available already for that car. Typically would be something like 1-5/8" - 1-3/4" diameter/.134 wall thickness,...... nowhere near what you are thinking.
Front frame rail rot, added to suspect door hinge bulkheads, coupled to cancerous floor boards equals a trip to the scrap yard for most cars, with one exception,........ Are you building the car into a drag car?
If so, not only are there round tube real frame rail packages out there but also the more common 2x3" rectangular pieces.

Yeah. 3" dom is definitely too much for this place. Maybe try the tractor pulling forum across the hall.

86Teksid said:

Its a drag car but I guess my questions are a little too much for this place. 2x3 up front, maybe on your car but thats a little too weak for my goals. Maybe you should get a bigger pic in your SIG.

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Wow, first you insult "this place", then talk chit on one the best fabricators here, waiting for the usual @madmike1157 reply that anyone reading this thread knows is coming

Waiting anxiously for the madmike smack down. Might as well get @84Ttop to chime in too. He knows a thing or two about chassis fabrication, but it's not like he has a sub 8-second street car or anything crazy like that.

so what your saying is you want to build a back half car with some ridiculously over sized tubing?

Because military tank

madspeed said:

Because military tank

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should weight about the same

86Teksid said:

Its a drag car but I guess my questions are a little too much for this place. 2x3 up front, maybe on your car but thats a little too weak for my goals. Maybe you should get a bigger pic in your SIG.

Click to expand...

Nobody.
Let me say that again so it'll soak in.
NOBODY has ever built a drag car using 3" round tubing on any part of the car, except exhaust tubing, and that is what that tubing is intended for.
Unless you are building a Monster Truck.
But then you aren't building a Monster truck now are you?
Dude, do yourself a favor, and get a chassis manual.
You'll see that every drag car ON EARTH is built using a combination of either 1-5/8"-1 3/4" .125 .134 wall mild steel for roll bars.
OR
1-5/8" Chromoly where the wall thickness is allowed to drop to about .090.
OR
And 2x3" .125 wall rectangular tubing for frame rails/ SFC's for those.

Here's a little tidbit for you to gnaw on:
The current 25-1/2/3/4/5 cars that have ever been built were built to NHRA mandated rules for safety at speeds exceeding 200 MPH. Those speeds are typically coupled to 1/4 mile ET's that are in the -8 second range. In order to be able to travel at speeds above 200 MPH and do it in less that 8 seconds requires power. Power in the 2000+ HP range is typically what it takes.
And the frames and cages in those cars are all built using 1-5/8 .090 wall chromoly tubing.

Now.

I'll write this real slow so you wont miss anything.

If These guys can make that much power, and go that freakin' fast, and the NHRA only requires a weenie little 1 and 5/8 inch, oh ninety wall tube, to be considered safe............

What the hell do you need a 3" round tube for again?.......... I forgot?

3"od .188 wall steel tubing...1.609lb/foot... good luck getting anywhere near 50/50 weight on that set up lol

86Teksid said:

Its a drag car but I guess my questions are a little too much for this place. 2x3 up front, maybe on your car but thats a little too weak for my goals. Maybe you should get a bigger pic in your SIG.

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Wow....you're new here and you ask for advice and you flame the people trying to help you? How about you let us know what your HP goals are, what kind of racing your wanting to do and what setup your going to run??

Unfortunately you sound like a wannabe that thinks he's smart but is asking for help on a forum because you lack the know how of designing and building it yourself. To me it seems like you want to build a race car with a truck frame for a roll cage.

Please act accordingly.