Cage Progress
Le Mans Master
Joined: Oct 2005
Posts: 9,429
Likes: 44
From: Macon, GA
Mine is 1.20 as well, but only because I didn't know any better. At the time, my base weight was over 3200lbs so I had to go 1.20 per the rules. I didn't put two and two together and realize that stripping the car would put it under 3200lbs. We figure my cage is about 35lbs heavier than Mark's.
Racer
Joined: Dec 2006
Posts: 4,434
Likes: 18
From: Braselton GA
Safety Car
Joined: May 2008
Posts: 4,629
Likes: 19
From: Chesapeake VA
Yep... Carlos said about 30-35lbs as well. However, .120 tubing is exponentially stronger than .095.
I just didn't want some scenario in the future where I was going to sell the car to someone who was 100lbs who would need to ballast the car up over 3000lbs to run ST2 or something and have a non-legal car.
As it sits now my car is under 2900lbs even with the .120 tubing... could have easily done .095 as well.
EDIT - using that calculator Mark linked .120 is about 20% stronger than .095 based on "moment of inertia".
I just didn't want some scenario in the future where I was going to sell the car to someone who was 100lbs who would need to ballast the car up over 3000lbs to run ST2 or something and have a non-legal car.
As it sits now my car is under 2900lbs even with the .120 tubing... could have easily done .095 as well.
EDIT - using that calculator Mark linked .120 is about 20% stronger than .095 based on "moment of inertia".
Last edited by travisnd; Dec 14, 2011 at 11:23 AM.
Thread Starter
Drifting
Joined: Sep 2009
Posts: 1,937
Likes: 65
From: Mooresville NC
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Thread Starter
Drifting
Joined: Sep 2009
Posts: 1,937
Likes: 65
From: Mooresville NC
I assume you are talking about the NASCAR bars on the passenger side as well as the dash bar (edit: not footwell) and factory bar?
Show me a race where there was NO traffic and you ran FLAT out for 45 minutes and I will concede your point.
Last edited by brkntrxn; Dec 14, 2011 at 01:26 PM.
Le Mans Master
Joined: Oct 2005
Posts: 9,429
Likes: 44
From: Macon, GA
You know I've kicked around this idea for a few months, but I just don't know if our cars would really benefit from the footwell bars. Our feet/legs are already pretty well protected due to the frame design. It'd be a different story on a uni-body car. Thoughts?
Safety Car
Joined: May 2008
Posts: 4,629
Likes: 19
From: Chesapeake VA
I focused my cage design on fitting my butt in the car and being able to get in out. I don't need more crap around my legs if I can help it.
I decided to not get the bar that goes between the A-pillar and top NASCAR bar specifically because I couldn't get out of the car with it there.
Race Director
Joined: Sep 1999
Posts: 12,438
Likes: 919
From: CONCORD NC
moment-of-inertia is the measurement for bending strength, which is why it is the primary focus of that calculator. It increases by radius raised to the 4th power, so increasing overall diameter has a HUGE effect on stiffness.
However, compression or tensile strength are purely based on cross section, so the strength increase with just the square of the radius. In other words thicker tubing does get "stiffer" faster than it gets "stronger".
However, compression or tensile strength are purely based on cross section, so the strength increase with just the square of the radius. In other words thicker tubing does get "stiffer" faster than it gets "stronger".
Drifting
Joined: Feb 2007
Posts: 1,418
Likes: 21
From: Macon, GA
