Would be interested in an e34 one.
as long as the 2nd downtube bar starts at the harness bar node (strength, you want them all at nodes), and then terminates on the plate with the second downtube bar.
You do not want to just put a support bar in the middle somewhere.
my build thread http://forums.bimmerforums.com/forum....php?t=1621405
For example, my rear section of my cage in my car
"Torque is like cowbell... you can never have too much." - Michael Cervi
On your cage, you also have a door bar backing up that brace bar. On the roll bar, there will be no door bar. So, i don't think it's too critical where the brace goes.
Jon
98 M3 Track/Autocross/Street- AST 4100s.
94 325is beater
Ill do a sedan. I just need someone to donate their car.
Specializing in Custom E30,E36,E46 Roll Bars Follow me on instagram @baysidefabrication
Very nice cage. Will be contacting you soon to order one for my car....
Just finished one today for a board member, but I made it out of 0.95. Finished weight is 58lbs
Specializing in Custom E30,E36,E46 Roll Bars Follow me on instagram @baysidefabrication
Last edited by 99MPower; 03-01-2012 at 12:04 AM.
"Torque is like cowbell... you can never have too much." - Michael Cervi
I know nothing about cage/bar design but I'm assuming that nodes are important in cages to avoid shear. For the roll bar, there's no opposing force (like the door bar of your cage that Jon already mentioned) and therefore should not shear under normal circumstances. If you hit a wall with the side of the car hitting straight on and created an axial force through the harness bar, it should create practically no opposing forces in the direction of the brace bar since it's at ~90* angle and would not shear. Now, if you hit the wall side first at an angle, I feel that having it welded at the node would be more beneficial since it wouldn't twist and buckle in between where the harness bar and brace bar connect. This would have to be a pretty severe crash to actually do such damage to the bar and most likely fatal, but for argument sake.. I'm no expert but I just wanted to voice my opinion and see what the experts have to say.
I do really like how the brace bar is underneath the window line if attached at the node.
I'm not suggesting that connecting at the node isn't better. That's pretty obvious. I'm just saying that:
Brace shown > No brace
Brace at node > Brace shown
The sheet metal at the wheel well is so thin that i doubt either of the braces in a simple roll bar are going to help. I can see it being useful in a cage though.
One aspect no one has discussed is the ability to put wheels/tires into the back seat with the bar installed. In my car, with my bar, with no brace, i am able to stack the tires. I think with the lower brace, that would be more difficult.
Last edited by fatboycowen; 03-01-2012 at 09:24 AM.
Jon
98 M3 Track/Autocross/Street- AST 4100s.
94 325is beater
I am going to have him make this controversial brace, crash my car and test whether or not it is an important structual piece
I agree with Jon, it is clearly better than no brace at all but is obviously not the most ideal method, which would be welded to the node. Good enough IMO.
Here is another one I made today for a board member. I like how it came out. Its .095 DOM. Final weight 50lbs even.
Specializing in Custom E30,E36,E46 Roll Bars Follow me on instagram @baysidefabrication
Looks sweet can't wait to put it in!
So someone needs to buy my 1.75 x .120 DOM bar that I first built. Price is $440 if you can come get it this weekend. Its taking up space in my garage. Call me if interested 860-324-7935
Specializing in Custom E30,E36,E46 Roll Bars Follow me on instagram @baysidefabrication
I might as well get a roll bar for my car since I never have people in the back seat
UPDATED PRICE- I will be charging $475 for a 1.75 x .095 DOM bar like the one I have posted in the first post. Without paint will be $460. If anyone wants anything different we can absolutely work something out and price it accordingly. Also I wanted to mention I am including plates that go on the underside of the car that sandwich the stock metal. I am not including hardware at this time, however if someone wants me to supply that I can pick it up and would just pass the cost of it along to you. Thank you all for the support, this is fun!
Specializing in Custom E30,E36,E46 Roll Bars Follow me on instagram @baysidefabrication
Ben...I thought Id post some info that might be helpful to you.
First...Ive attached a page that has the dimensions of the coupe and sedan.
Second...If you don't already know large items like these rollbars can be shipped nationwide via Greyhound Package Express(bus) for around $100.
Thirdly...Powder coating these bolt in roll bars runs about $250.00 but if you're doing multiples they may be able to get that price down.
Cheers !
MikeD.
'95 Swapped Hatchback
All caught up with orders. I have all week off and can have yours done and able to be picked up by the weekend!
Specializing in Custom E30,E36,E46 Roll Bars Follow me on instagram @baysidefabrication
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